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7.2 .Netty 初认识 -- 编解码 -protobuf 序列化

本贴最后更新于 1513 天前，其中的信息可能已经时移世异

先安装 protobuf

编写 SubscribeReq.proto

package netty;
option java_package = "club.wujingjian.com.wujingjian.netty.serial.java.vo2";
option java_outer_classname = "SubscribeReqProto";

message SubscribeReq {
required int32 subReqID = 1;;
required string userName = 2;
required string productName = 3;
required string address = 4;
}

编写: SubscribeResp.proto

package netty;
option java_package = "club.wujingjian.com.wujingjian.netty.serial.java.vo2";
option java_outer_classname = "SubscribeRespProto";

message SubscribeResp {
required int32 subReqID = 1;;
required int32 respCode = 2;
required string desc = 3;
}

调用 protoc 命令将.proto 文件生成对应的 Java 类
protoc --java_out=. SubscribeReq.proto
protoc --java_out=. SubscribeResp.proto

// Generated by the protocol buffer compiler.  DO NOT EDIT!
// source: SubscribeReq.proto

package club.wujingjian.com.wujingjian.netty.serial.protobuf.vo2;

public final class SubscribeReqProto {
  private SubscribeReqProto() {}
  public static void registerAllExtensions(
      com.google.protobuf.ExtensionRegistryLite registry) {
  }

  public static void registerAllExtensions(
      com.google.protobuf.ExtensionRegistry registry) {
    registerAllExtensions(
        (com.google.protobuf.ExtensionRegistryLite) registry);
  }
  public interface SubscribeReqOrBuilder extends
      // @@protoc_insertion_point(interface_extends:netty.SubscribeReq)
      com.google.protobuf.MessageOrBuilder {

    /**
     * <code>required int32 subReqID = 1;</code>
     * @return Whether the subReqID field is set.
     */
    boolean hasSubReqID();
    /**
     * <code>required int32 subReqID = 1;</code>
     * @return The subReqID.
     */
    int getSubReqID();

    /**
     * <code>required string userName = 2;</code>
     * @return Whether the userName field is set.
     */
    boolean hasUserName();
    /**
     * <code>required string userName = 2;</code>
     * @return The userName.
     */
    String getUserName();
    /**
     * <code>required string userName = 2;</code>
     * @return The bytes for userName.
     */
    com.google.protobuf.ByteString
        getUserNameBytes();

    /**
     * <code>required string productName = 3;</code>
     * @return Whether the productName field is set.
     */
    boolean hasProductName();
    /**
     * <code>required string productName = 3;</code>
     * @return The productName.
     */
    String getProductName();
    /**
     * <code>required string productName = 3;</code>
     * @return The bytes for productName.
     */
    com.google.protobuf.ByteString
        getProductNameBytes();

    /**
     * <code>required string address = 4;</code>
     * @return Whether the address field is set.
     */
    boolean hasAddress();
    /**
     * <code>required string address = 4;</code>
     * @return The address.
     */
    String getAddress();
    /**
     * <code>required string address = 4;</code>
     * @return The bytes for address.
     */
    com.google.protobuf.ByteString
        getAddressBytes();
  }
  /**
   * Protobuf type {@code netty.SubscribeReq}
   */
  public  static final class SubscribeReq extends
      com.google.protobuf.GeneratedMessageV3 implements
      // @@protoc_insertion_point(message_implements:netty.SubscribeReq)
      SubscribeReqOrBuilder {
  private static final long serialVersionUID = 0L;
    // Use SubscribeReq.newBuilder() to construct.
    private SubscribeReq(com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
      super(builder);
    }
    private SubscribeReq() {
      userName_ = "";
      productName_ = "";
      address_ = "";
    }

    @Override
    @SuppressWarnings({"unused"})
    protected Object newInstance(
        UnusedPrivateParameter unused) {
      return new SubscribeReq();
    }

    @Override
    public final com.google.protobuf.UnknownFieldSet
    getUnknownFields() {
      return this.unknownFields;
    }
    private SubscribeReq(
        com.google.protobuf.CodedInputStream input,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws com.google.protobuf.InvalidProtocolBufferException {
      this();
      if (extensionRegistry == null) {
        throw new NullPointerException();
      }
      int mutable_bitField0_ = 0;
      com.google.protobuf.UnknownFieldSet.Builder unknownFields =
          com.google.protobuf.UnknownFieldSet.newBuilder();
      try {
        boolean done = false;
        while (!done) {
          int tag = input.readTag();
          switch (tag) {
            case 0:
              done = true;
              break;
            case 8: {
              bitField0_ |= 0x00000001;
              subReqID_ = input.readInt32();
              break;
            }
            case 18: {
              com.google.protobuf.ByteString bs = input.readBytes();
              bitField0_ |= 0x00000002;
              userName_ = bs;
              break;
            }
            case 26: {
              com.google.protobuf.ByteString bs = input.readBytes();
              bitField0_ |= 0x00000004;
              productName_ = bs;
              break;
            }
            case 34: {
              com.google.protobuf.ByteString bs = input.readBytes();
              bitField0_ |= 0x00000008;
              address_ = bs;
              break;
            }
            default: {
              if (!parseUnknownField(
                  input, unknownFields, extensionRegistry, tag)) {
                done = true;
              }
              break;
            }
          }
        }
      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
        throw e.setUnfinishedMessage(this);
      } catch (java.io.IOException e) {
        throw new com.google.protobuf.InvalidProtocolBufferException(
            e).setUnfinishedMessage(this);
      } finally {
        this.unknownFields = unknownFields.build();
        makeExtensionsImmutable();
      }
    }
    public static final com.google.protobuf.Descriptors.Descriptor
        getDescriptor() {
      return SubscribeReqProto.internal_static_netty_SubscribeReq_descriptor;
    }

    @Override
    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
        internalGetFieldAccessorTable() {
      return SubscribeReqProto.internal_static_netty_SubscribeReq_fieldAccessorTable
          .ensureFieldAccessorsInitialized(
              SubscribeReq.class, Builder.class);
    }

    private int bitField0_;
    public static final int SUBREQID_FIELD_NUMBER = 1;
    private int subReqID_;
    /**
     * <code>required int32 subReqID = 1;</code>
     * @return Whether the subReqID field is set.
     */
    public boolean hasSubReqID() {
      return ((bitField0_ & 0x00000001) != 0);
    }
    /**
     * <code>required int32 subReqID = 1;</code>
     * @return The subReqID.
     */
    public int getSubReqID() {
      return subReqID_;
    }

    public static final int USERNAME_FIELD_NUMBER = 2;
    private volatile Object userName_;
    /**
     * <code>required string userName = 2;</code>
     * @return Whether the userName field is set.
     */
    public boolean hasUserName() {
      return ((bitField0_ & 0x00000002) != 0);
    }
    /**
     * <code>required string userName = 2;</code>
     * @return The userName.
     */
    public String getUserName() {
      Object ref = userName_;
      if (ref instanceof String) {
        return (String) ref;
      } else {
        com.google.protobuf.ByteString bs = 
            (com.google.protobuf.ByteString) ref;
        String s = bs.toStringUtf8();
        if (bs.isValidUtf8()) {
          userName_ = s;
        }
        return s;
      }
    }
    /**
     * <code>required string userName = 2;</code>
     * @return The bytes for userName.
     */
    public com.google.protobuf.ByteString
        getUserNameBytes() {
      Object ref = userName_;
      if (ref instanceof String) {
        com.google.protobuf.ByteString b = 
            com.google.protobuf.ByteString.copyFromUtf8(
                (String) ref);
        userName_ = b;
        return b;
      } else {
        return (com.google.protobuf.ByteString) ref;
      }
    }

    public static final int PRODUCTNAME_FIELD_NUMBER = 3;
    private volatile Object productName_;
    /**
     * <code>required string productName = 3;</code>
     * @return Whether the productName field is set.
     */
    public boolean hasProductName() {
      return ((bitField0_ & 0x00000004) != 0);
    }
    /**
     * <code>required string productName = 3;</code>
     * @return The productName.
     */
    public String getProductName() {
      Object ref = productName_;
      if (ref instanceof String) {
        return (String) ref;
      } else {
        com.google.protobuf.ByteString bs = 
            (com.google.protobuf.ByteString) ref;
        String s = bs.toStringUtf8();
        if (bs.isValidUtf8()) {
          productName_ = s;
        }
        return s;
      }
    }
    /**
     * <code>required string productName = 3;</code>
     * @return The bytes for productName.
     */
    public com.google.protobuf.ByteString
        getProductNameBytes() {
      Object ref = productName_;
      if (ref instanceof String) {
        com.google.protobuf.ByteString b = 
            com.google.protobuf.ByteString.copyFromUtf8(
                (String) ref);
        productName_ = b;
        return b;
      } else {
        return (com.google.protobuf.ByteString) ref;
      }
    }

    public static final int ADDRESS_FIELD_NUMBER = 4;
    private volatile Object address_;
    /**
     * <code>required string address = 4;</code>
     * @return Whether the address field is set.
     */
    public boolean hasAddress() {
      return ((bitField0_ & 0x00000008) != 0);
    }
    /**
     * <code>required string address = 4;</code>
     * @return The address.
     */
    public String getAddress() {
      Object ref = address_;
      if (ref instanceof String) {
        return (String) ref;
      } else {
        com.google.protobuf.ByteString bs = 
            (com.google.protobuf.ByteString) ref;
        String s = bs.toStringUtf8();
        if (bs.isValidUtf8()) {
          address_ = s;
        }
        return s;
      }
    }
    /**
     * <code>required string address = 4;</code>
     * @return The bytes for address.
     */
    public com.google.protobuf.ByteString
        getAddressBytes() {
      Object ref = address_;
      if (ref instanceof String) {
        com.google.protobuf.ByteString b = 
            com.google.protobuf.ByteString.copyFromUtf8(
                (String) ref);
        address_ = b;
        return b;
      } else {
        return (com.google.protobuf.ByteString) ref;
      }
    }

    private byte memoizedIsInitialized = -1;
    @Override
    public final boolean isInitialized() {
      byte isInitialized = memoizedIsInitialized;
      if (isInitialized == 1) return true;
      if (isInitialized == 0) return false;

      if (!hasSubReqID()) {
        memoizedIsInitialized = 0;
        return false;
      }
      if (!hasUserName()) {
        memoizedIsInitialized = 0;
        return false;
      }
      if (!hasProductName()) {
        memoizedIsInitialized = 0;
        return false;
      }
      if (!hasAddress()) {
        memoizedIsInitialized = 0;
        return false;
      }
      memoizedIsInitialized = 1;
      return true;
    }

    @Override
    public void writeTo(com.google.protobuf.CodedOutputStream output)
                        throws java.io.IOException {
      if (((bitField0_ & 0x00000001) != 0)) {
        output.writeInt32(1, subReqID_);
      }
      if (((bitField0_ & 0x00000002) != 0)) {
        com.google.protobuf.GeneratedMessageV3.writeString(output, 2, userName_);
      }
      if (((bitField0_ & 0x00000004) != 0)) {
        com.google.protobuf.GeneratedMessageV3.writeString(output, 3, productName_);
      }
      if (((bitField0_ & 0x00000008) != 0)) {
        com.google.protobuf.GeneratedMessageV3.writeString(output, 4, address_);
      }
      unknownFields.writeTo(output);
    }

    @Override
    public int getSerializedSize() {
      int size = memoizedSize;
      if (size != -1) return size;

      size = 0;
      if (((bitField0_ & 0x00000001) != 0)) {
        size += com.google.protobuf.CodedOutputStream
          .computeInt32Size(1, subReqID_);
      }
      if (((bitField0_ & 0x00000002) != 0)) {
        size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, userName_);
      }
      if (((bitField0_ & 0x00000004) != 0)) {
        size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, productName_);
      }
      if (((bitField0_ & 0x00000008) != 0)) {
        size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, address_);
      }
      size += unknownFields.getSerializedSize();
      memoizedSize = size;
      return size;
    }

    @Override
    public boolean equals(final Object obj) {
      if (obj == this) {
       return true;
      }
      if (!(obj instanceof SubscribeReq)) {
        return super.equals(obj);
      }
      SubscribeReq other = (SubscribeReq) obj;

      if (hasSubReqID() != other.hasSubReqID()) return false;
      if (hasSubReqID()) {
        if (getSubReqID()
            != other.getSubReqID()) return false;
      }
      if (hasUserName() != other.hasUserName()) return false;
      if (hasUserName()) {
        if (!getUserName()
            .equals(other.getUserName())) return false;
      }
      if (hasProductName() != other.hasProductName()) return false;
      if (hasProductName()) {
        if (!getProductName()
            .equals(other.getProductName())) return false;
      }
      if (hasAddress() != other.hasAddress()) return false;
      if (hasAddress()) {
        if (!getAddress()
            .equals(other.getAddress())) return false;
      }
      if (!unknownFields.equals(other.unknownFields)) return false;
      return true;
    }

    @Override
    public int hashCode() {
      if (memoizedHashCode != 0) {
        return memoizedHashCode;
      }
      int hash = 41;
      hash = (19 * hash) + getDescriptor().hashCode();
      if (hasSubReqID()) {
        hash = (37 * hash) + SUBREQID_FIELD_NUMBER;
        hash = (53 * hash) + getSubReqID();
      }
      if (hasUserName()) {
        hash = (37 * hash) + USERNAME_FIELD_NUMBER;
        hash = (53 * hash) + getUserName().hashCode();
      }
      if (hasProductName()) {
        hash = (37 * hash) + PRODUCTNAME_FIELD_NUMBER;
        hash = (53 * hash) + getProductName().hashCode();
      }
      if (hasAddress()) {
        hash = (37 * hash) + ADDRESS_FIELD_NUMBER;
        hash = (53 * hash) + getAddress().hashCode();
      }
      hash = (29 * hash) + unknownFields.hashCode();
      memoizedHashCode = hash;
      return hash;
    }

    public static SubscribeReq parseFrom(
        java.nio.ByteBuffer data)
        throws com.google.protobuf.InvalidProtocolBufferException {
      return PARSER.parseFrom(data);
    }
    public static SubscribeReq parseFrom(
        java.nio.ByteBuffer data,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws com.google.protobuf.InvalidProtocolBufferException {
      return PARSER.parseFrom(data, extensionRegistry);
    }
    public static SubscribeReq parseFrom(
        com.google.protobuf.ByteString data)
        throws com.google.protobuf.InvalidProtocolBufferException {
      return PARSER.parseFrom(data);
    }
    public static SubscribeReq parseFrom(
        com.google.protobuf.ByteString data,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws com.google.protobuf.InvalidProtocolBufferException {
      return PARSER.parseFrom(data, extensionRegistry);
    }
    public static SubscribeReq parseFrom(byte[] data)
        throws com.google.protobuf.InvalidProtocolBufferException {
      return PARSER.parseFrom(data);
    }
    public static SubscribeReq parseFrom(
        byte[] data,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws com.google.protobuf.InvalidProtocolBufferException {
      return PARSER.parseFrom(data, extensionRegistry);
    }
    public static SubscribeReq parseFrom(java.io.InputStream input)
        throws java.io.IOException {
      return com.google.protobuf.GeneratedMessageV3
          .parseWithIOException(PARSER, input);
    }
    public static SubscribeReq parseFrom(
        java.io.InputStream input,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws java.io.IOException {
      return com.google.protobuf.GeneratedMessageV3
          .parseWithIOException(PARSER, input, extensionRegistry);
    }
    public static SubscribeReq parseDelimitedFrom(java.io.InputStream input)
        throws java.io.IOException {
      return com.google.protobuf.GeneratedMessageV3
          .parseDelimitedWithIOException(PARSER, input);
    }
    public static SubscribeReq parseDelimitedFrom(
        java.io.InputStream input,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws java.io.IOException {
      return com.google.protobuf.GeneratedMessageV3
          .parseDelimitedWithIOException(PARSER, input, extensionRegistry);
    }
    public static SubscribeReq parseFrom(
        com.google.protobuf.CodedInputStream input)
        throws java.io.IOException {
      return com.google.protobuf.GeneratedMessageV3
          .parseWithIOException(PARSER, input);
    }
    public static SubscribeReq parseFrom(
        com.google.protobuf.CodedInputStream input,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws java.io.IOException {
      return com.google.protobuf.GeneratedMessageV3
          .parseWithIOException(PARSER, input, extensionRegistry);
    }

    @Override
    public Builder newBuilderForType() { return newBuilder(); }
    public static Builder newBuilder() {
      return DEFAULT_INSTANCE.toBuilder();
    }
    public static Builder newBuilder(SubscribeReq prototype) {
      return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
    }
    @Override
    public Builder toBuilder() {
      return this == DEFAULT_INSTANCE
          ? new Builder() : new Builder().mergeFrom(this);
    }

    @Override
    protected Builder newBuilderForType(
        com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
      Builder builder = new Builder(parent);
      return builder;
    }
    /**
     * Protobuf type {@code netty.SubscribeReq}
     */
    public static final class Builder extends
        com.google.protobuf.GeneratedMessageV3.Builder<Builder> implements
        // @@protoc_insertion_point(builder_implements:netty.SubscribeReq)
        SubscribeReqOrBuilder {
      public static final com.google.protobuf.Descriptors.Descriptor
          getDescriptor() {
        return SubscribeReqProto.internal_static_netty_SubscribeReq_descriptor;
      }

      @Override
      protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
          internalGetFieldAccessorTable() {
        return SubscribeReqProto.internal_static_netty_SubscribeReq_fieldAccessorTable
            .ensureFieldAccessorsInitialized(
                SubscribeReq.class, Builder.class);
      }

      // Construct using club.wujingjian.com.wujingjian.netty.serial.java.vo2.SubscribeReqProto.SubscribeReq.newBuilder()
      private Builder() {
        maybeForceBuilderInitialization();
      }

      private Builder(
          com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
        super(parent);
        maybeForceBuilderInitialization();
      }
      private void maybeForceBuilderInitialization() {
        if (com.google.protobuf.GeneratedMessageV3
                .alwaysUseFieldBuilders) {
        }
      }
      @Override
      public Builder clear() {
        super.clear();
        subReqID_ = 0;
        bitField0_ = (bitField0_ & ~0x00000001);
        userName_ = "";
        bitField0_ = (bitField0_ & ~0x00000002);
        productName_ = "";
        bitField0_ = (bitField0_ & ~0x00000004);
        address_ = "";
        bitField0_ = (bitField0_ & ~0x00000008);
        return this;
      }

      @Override
      public com.google.protobuf.Descriptors.Descriptor
          getDescriptorForType() {
        return SubscribeReqProto.internal_static_netty_SubscribeReq_descriptor;
      }

      @Override
      public SubscribeReq getDefaultInstanceForType() {
        return SubscribeReq.getDefaultInstance();
      }

      @Override
      public SubscribeReq build() {
        SubscribeReq result = buildPartial();
        if (!result.isInitialized()) {
          throw newUninitializedMessageException(result);
        }
        return result;
      }

      @Override
      public SubscribeReq buildPartial() {
        SubscribeReq result = new SubscribeReq(this);
        int from_bitField0_ = bitField0_;
        int to_bitField0_ = 0;
        if (((from_bitField0_ & 0x00000001) != 0)) {
          result.subReqID_ = subReqID_;
          to_bitField0_ |= 0x00000001;
        }
        if (((from_bitField0_ & 0x00000002) != 0)) {
          to_bitField0_ |= 0x00000002;
        }
        result.userName_ = userName_;
        if (((from_bitField0_ & 0x00000004) != 0)) {
          to_bitField0_ |= 0x00000004;
        }
        result.productName_ = productName_;
        if (((from_bitField0_ & 0x00000008) != 0)) {
          to_bitField0_ |= 0x00000008;
        }
        result.address_ = address_;
        result.bitField0_ = to_bitField0_;
        onBuilt();
        return result;
      }

      @Override
      public Builder clone() {
        return super.clone();
      }
      @Override
      public Builder setField(
          com.google.protobuf.Descriptors.FieldDescriptor field,
          Object value) {
        return super.setField(field, value);
      }
      @Override
      public Builder clearField(
          com.google.protobuf.Descriptors.FieldDescriptor field) {
        return super.clearField(field);
      }
      @Override
      public Builder clearOneof(
          com.google.protobuf.Descriptors.OneofDescriptor oneof) {
        return super.clearOneof(oneof);
      }
      @Override
      public Builder setRepeatedField(
          com.google.protobuf.Descriptors.FieldDescriptor field,
          int index, Object value) {
        return super.setRepeatedField(field, index, value);
      }
      @Override
      public Builder addRepeatedField(
          com.google.protobuf.Descriptors.FieldDescriptor field,
          Object value) {
        return super.addRepeatedField(field, value);
      }
      @Override
      public Builder mergeFrom(com.google.protobuf.Message other) {
        if (other instanceof SubscribeReq) {
          return mergeFrom((SubscribeReq)other);
        } else {
          super.mergeFrom(other);
          return this;
        }
      }

      public Builder mergeFrom(SubscribeReq other) {
        if (other == SubscribeReq.getDefaultInstance()) return this;
        if (other.hasSubReqID()) {
          setSubReqID(other.getSubReqID());
        }
        if (other.hasUserName()) {
          bitField0_ |= 0x00000002;
          userName_ = other.userName_;
          onChanged();
        }
        if (other.hasProductName()) {
          bitField0_ |= 0x00000004;
          productName_ = other.productName_;
          onChanged();
        }
        if (other.hasAddress()) {
          bitField0_ |= 0x00000008;
          address_ = other.address_;
          onChanged();
        }
        this.mergeUnknownFields(other.unknownFields);
        onChanged();
        return this;
      }

      @Override
      public final boolean isInitialized() {
        if (!hasSubReqID()) {
          return false;
        }
        if (!hasUserName()) {
          return false;
        }
        if (!hasProductName()) {
          return false;
        }
        if (!hasAddress()) {
          return false;
        }
        return true;
      }

      @Override
      public Builder mergeFrom(
          com.google.protobuf.CodedInputStream input,
          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
          throws java.io.IOException {
        SubscribeReq parsedMessage = null;
        try {
          parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
          parsedMessage = (SubscribeReq) e.getUnfinishedMessage();
          throw e.unwrapIOException();
        } finally {
          if (parsedMessage != null) {
            mergeFrom(parsedMessage);
          }
        }
        return this;
      }
      private int bitField0_;

      private int subReqID_ ;
      /**
       * <code>required int32 subReqID = 1;</code>
       * @return Whether the subReqID field is set.
       */
      public boolean hasSubReqID() {
        return ((bitField0_ & 0x00000001) != 0);
      }
      /**
       * <code>required int32 subReqID = 1;</code>
       * @return The subReqID.
       */
      public int getSubReqID() {
        return subReqID_;
      }
      /**
       * <code>required int32 subReqID = 1;</code>
       * @param value The subReqID to set.
       * @return This builder for chaining.
       */
      public Builder setSubReqID(int value) {
        bitField0_ |= 0x00000001;
        subReqID_ = value;
        onChanged();
        return this;
      }
      /**
       * <code>required int32 subReqID = 1;</code>
       * @return This builder for chaining.
       */
      public Builder clearSubReqID() {
        bitField0_ = (bitField0_ & ~0x00000001);
        subReqID_ = 0;
        onChanged();
        return this;
      }

      private Object userName_ = "";
      /**
       * <code>required string userName = 2;</code>
       * @return Whether the userName field is set.
       */
      public boolean hasUserName() {
        return ((bitField0_ & 0x00000002) != 0);
      }
      /**
       * <code>required string userName = 2;</code>
       * @return The userName.
       */
      public String getUserName() {
        Object ref = userName_;
        if (!(ref instanceof String)) {
          com.google.protobuf.ByteString bs =
              (com.google.protobuf.ByteString) ref;
          String s = bs.toStringUtf8();
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  bitField0_ |= 0x00000008;
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        address_ = getDefaultInstance().getAddress();
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        return this;
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       * @param value The bytes for address to set.
       * @return This builder for chaining.
       */
      public Builder setAddressBytes(
          com.google.protobuf.ByteString value) {
        if (value == null) {
    throw new NullPointerException();
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  bitField0_ |= 0x00000008;
        address_ = value;
        onChanged();
        return this;
      }
      @Override
      public final Builder setUnknownFields(
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      // @@protoc_insertion_point(builder_scope:netty.SubscribeReq)
    }

    // @@protoc_insertion_point(class_scope:netty.SubscribeReq)
    private static final SubscribeReq DEFAULT_INSTANCE;
    static {
      DEFAULT_INSTANCE = new SubscribeReq();
    }

    public static SubscribeReq getDefaultInstance() {
      return DEFAULT_INSTANCE;
    }

    @Deprecated public static final com.google.protobuf.Parser<SubscribeReq>
        PARSER = new com.google.protobuf.AbstractParser<SubscribeReq>() {
      @Override
      public SubscribeReq parsePartialFrom(
          com.google.protobuf.CodedInputStream input,
          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
          throws com.google.protobuf.InvalidProtocolBufferException {
        return new SubscribeReq(input, extensionRegistry);
      }
    };

    public static com.google.protobuf.Parser<SubscribeReq> parser() {
      return PARSER;
    }

    @Override
    public com.google.protobuf.Parser<SubscribeReq> getParserForType() {
      return PARSER;
    }

    @Override
    public SubscribeReq getDefaultInstanceForType() {
      return DEFAULT_INSTANCE;
    }

  }

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  private static final 
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  public static com.google.protobuf.Descriptors.FileDescriptor
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    return descriptor;
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  private static  com.google.protobuf.Descriptors.FileDescriptor
      descriptor;
  static {
    String[] descriptorData = {
      "\n\022SubscribeReq.proto\022\005netty\"X\n\014Subscribe" +
      "Req\022\020\n\010subReqID\030\001 \002(\005\022\020\n\010userName\030\002 \002(\t\022" +
      "\023\n\013productName\030\003 \002(\t\022\017\n\007address\030\004 \002(\tBI\n" +
      "4club.wujingjian.com.wujingjian.netty.se" +
      "rial.java.vo2B\021SubscribeReqProto"
    };
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  // @@protoc_insertion_point(outer_class_scope)
}


// Generated by the protocol buffer compiler.  DO NOT EDIT!
// source: SubscribeResp.proto

package club.wujingjian.com.wujingjian.netty.serial.protobuf.vo2;

public final class SubscribeRespProto {
  private SubscribeRespProto() {}
  public static void registerAllExtensions(
      com.google.protobuf.ExtensionRegistryLite registry) {
  }

  public static void registerAllExtensions(
      com.google.protobuf.ExtensionRegistry registry) {
    registerAllExtensions(
        (com.google.protobuf.ExtensionRegistryLite) registry);
  }
  public interface SubscribeRespOrBuilder extends
      // @@protoc_insertion_point(interface_extends:netty.SubscribeResp)
      com.google.protobuf.MessageOrBuilder {

    /**
     * <code>required int32 subReqID = 1;</code>
     * @return Whether the subReqID field is set.
     */
    boolean hasSubReqID();
    /**
     * <code>required int32 subReqID = 1;</code>
     * @return The subReqID.
     */
    int getSubReqID();

    /**
     * <code>required int32 respCode = 2;</code>
     * @return Whether the respCode field is set.
     */
    boolean hasRespCode();
    /**
     * <code>required int32 respCode = 2;</code>
     * @return The respCode.
     */
    int getRespCode();

    /**
     * <code>required string desc = 3;</code>
     * @return Whether the desc field is set.
     */
    boolean hasDesc();
    /**
     * <code>required string desc = 3;</code>
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    String getDesc();
    /**
     * <code>required string desc = 3;</code>
     * @return The bytes for desc.
     */
    com.google.protobuf.ByteString
        getDescBytes();
  }
  /**
   * Protobuf type {@code netty.SubscribeResp}
   */
  public  static final class SubscribeResp extends
      com.google.protobuf.GeneratedMessageV3 implements
      // @@protoc_insertion_point(message_implements:netty.SubscribeResp)
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    private SubscribeResp(com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
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    private SubscribeResp() {
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    @Override
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    protected Object newInstance(
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      return new SubscribeResp();
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    @Override
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    public static final com.google.protobuf.Descriptors.Descriptor
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    }

    @Override
    protected FieldAccessorTable
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              SubscribeResp.class, Builder.class);
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    private int bitField0_;
    public static final int SUBREQID_FIELD_NUMBER = 1;
    private int subReqID_;
    /**
     * <code>required int32 subReqID = 1;</code>
     * @return Whether the subReqID field is set.
     */
    public boolean hasSubReqID() {
      return ((bitField0_ & 0x00000001) != 0);
    }
    /**
     * <code>required int32 subReqID = 1;</code>
     * @return The subReqID.
     */
    public int getSubReqID() {
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    }

    public static final int RESPCODE_FIELD_NUMBER = 2;
    private int respCode_;
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     * <code>required int32 respCode = 2;</code>
     * @return Whether the respCode field is set.
     */
    public boolean hasRespCode() {
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    }
    /**
     * <code>required int32 respCode = 2;</code>
     * @return The respCode.
     */
    public int getRespCode() {
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    }

    public static final int DESC_FIELD_NUMBER = 3;
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    /**
     * <code>required string desc = 3;</code>
     * @return Whether the desc field is set.
     */
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    /**
     * <code>required string desc = 3;</code>
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        return (String) ref;
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          desc_ = s;
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    public com.google.protobuf.ByteString
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      if (ref instanceof String) {
        com.google.protobuf.ByteString b = 
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    private byte memoizedIsInitialized = -1;
    @Override
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      if (isInitialized == 1) return true;
      if (isInitialized == 0) return false;

      if (!hasSubReqID()) {
        memoizedIsInitialized = 0;
        return false;
      }
      if (!hasRespCode()) {
        memoizedIsInitialized = 0;
        return false;
      }
      if (!hasDesc()) {
        memoizedIsInitialized = 0;
        return false;
      }
      memoizedIsInitialized = 1;
      return true;
    }

    @Override
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                        throws java.io.IOException {
      if (((bitField0_ & 0x00000001) != 0)) {
        output.writeInt32(1, subReqID_);
      }
      if (((bitField0_ & 0x00000002) != 0)) {
        output.writeInt32(2, respCode_);
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      if (((bitField0_ & 0x00000004) != 0)) {
        com.google.protobuf.GeneratedMessageV3.writeString(output, 3, desc_);
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    @Override
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      size = 0;
      if (((bitField0_ & 0x00000001) != 0)) {
        size += com.google.protobuf.CodedOutputStream
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    @Override
    public boolean equals(final Object obj) {
      if (obj == this) {
       return true;
      }
      if (!(obj instanceof SubscribeResp)) {
        return super.equals(obj);
      }
      SubscribeResp other = (SubscribeResp) obj;

      if (hasSubReqID() != other.hasSubReqID()) return false;
      if (hasSubReqID()) {
        if (getSubReqID()
            != other.getSubReqID()) return false;
      }
      if (hasRespCode() != other.hasRespCode()) return false;
      if (hasRespCode()) {
        if (getRespCode()
            != other.getRespCode()) return false;
      }
      if (hasDesc() != other.hasDesc()) return false;
      if (hasDesc()) {
        if (!getDesc()
            .equals(other.getDesc())) return false;
      }
      if (!unknownFields.equals(other.unknownFields)) return false;
      return true;
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    @Override
    public int hashCode() {
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        return memoizedHashCode;
      }
      int hash = 41;
      hash = (19 * hash) + getDescriptor().hashCode();
      if (hasSubReqID()) {
        hash = (37 * hash) + SUBREQID_FIELD_NUMBER;
        hash = (53 * hash) + getSubReqID();
      }
      if (hasRespCode()) {
        hash = (37 * hash) + RESPCODE_FIELD_NUMBER;
        hash = (53 * hash) + getRespCode();
      }
      if (hasDesc()) {
        hash = (37 * hash) + DESC_FIELD_NUMBER;
        hash = (53 * hash) + getDesc().hashCode();
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      hash = (29 * hash) + unknownFields.hashCode();
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      return hash;
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    public static SubscribeResp parseFrom(
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      return PARSER.parseFrom(data);
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        java.nio.ByteBuffer data,
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        throws com.google.protobuf.InvalidProtocolBufferException {
      return PARSER.parseFrom(data, extensionRegistry);
    }
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        com.google.protobuf.ByteString data)
        throws com.google.protobuf.InvalidProtocolBufferException {
      return PARSER.parseFrom(data);
    }
    public static SubscribeResp parseFrom(
        com.google.protobuf.ByteString data,
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      return PARSER.parseFrom(data, extensionRegistry);
    }
    public static SubscribeResp parseFrom(byte[] data)
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      return PARSER.parseFrom(data);
    }
    public static SubscribeResp parseFrom(
        byte[] data,
        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
        throws com.google.protobuf.InvalidProtocolBufferException {
      return PARSER.parseFrom(data, extensionRegistry);
    }
    public static SubscribeResp parseFrom(java.io.InputStream input)
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      return com.google.protobuf.GeneratedMessageV3
          .parseWithIOException(PARSER, input);
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    public static SubscribeResp parseDelimitedFrom(java.io.InputStream input)
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          .parseDelimitedWithIOException(PARSER, input);
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    public static SubscribeResp parseDelimitedFrom(
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        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
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          .parseDelimitedWithIOException(PARSER, input, extensionRegistry);
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    public static SubscribeResp parseFrom(
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        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
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    @Override
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      return DEFAULT_INSTANCE.toBuilder();
    }
    public static Builder newBuilder(SubscribeResp prototype) {
      return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
    }
    @Override
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      return this == DEFAULT_INSTANCE
          ? new Builder() : new Builder().mergeFrom(this);
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    @Override
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        BuilderParent parent) {
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    /**
     * Protobuf type {@code netty.SubscribeResp}
     */
    public static final class Builder extends
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      // Construct using club.wujingjian.com.wujingjian.netty.serial.java.vo2.SubscribeRespProto.SubscribeResp.newBuilder()
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        maybeForceBuilderInitialization();
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        respCode_ = 0;
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      @Override
      public Builder clearField(
          com.google.protobuf.Descriptors.FieldDescriptor field) {
        return super.clearField(field);
      }
      @Override
      public Builder clearOneof(
          com.google.protobuf.Descriptors.OneofDescriptor oneof) {
        return super.clearOneof(oneof);
      }
      @Override
      public Builder setRepeatedField(
          com.google.protobuf.Descriptors.FieldDescriptor field,
          int index, Object value) {
        return super.setRepeatedField(field, index, value);
      }
      @Override
      public Builder addRepeatedField(
          com.google.protobuf.Descriptors.FieldDescriptor field,
          Object value) {
        return super.addRepeatedField(field, value);
      }
      @Override
      public Builder mergeFrom(com.google.protobuf.Message other) {
        if (other instanceof SubscribeResp) {
          return mergeFrom((SubscribeResp)other);
        } else {
          super.mergeFrom(other);
          return this;
        }
      }

      public Builder mergeFrom(SubscribeResp other) {
        if (other == SubscribeResp.getDefaultInstance()) return this;
        if (other.hasSubReqID()) {
          setSubReqID(other.getSubReqID());
        }
        if (other.hasRespCode()) {
          setRespCode(other.getRespCode());
        }
        if (other.hasDesc()) {
          bitField0_ |= 0x00000004;
          desc_ = other.desc_;
          onChanged();
        }
        this.mergeUnknownFields(other.unknownFields);
        onChanged();
        return this;
      }

      @Override
      public final boolean isInitialized() {
        if (!hasSubReqID()) {
          return false;
        }
        if (!hasRespCode()) {
          return false;
        }
        if (!hasDesc()) {
          return false;
        }
        return true;
      }

      @Override
      public Builder mergeFrom(
          com.google.protobuf.CodedInputStream input,
          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
          throws java.io.IOException {
        SubscribeResp parsedMessage = null;
        try {
          parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
          parsedMessage = (SubscribeResp) e.getUnfinishedMessage();
          throw e.unwrapIOException();
        } finally {
          if (parsedMessage != null) {
            mergeFrom(parsedMessage);
          }
        }
        return this;
      }
      private int bitField0_;

      private int subReqID_ ;
      /**
       * <code>required int32 subReqID = 1;</code>
       * @return Whether the subReqID field is set.
       */
      public boolean hasSubReqID() {
        return ((bitField0_ & 0x00000001) != 0);
      }
      /**
       * <code>required int32 subReqID = 1;</code>
       * @return The subReqID.
       */
      public int getSubReqID() {
        return subReqID_;
      }
      /**
       * <code>required int32 subReqID = 1;</code>
       * @param value The subReqID to set.
       * @return This builder for chaining.
       */
      public Builder setSubReqID(int value) {
        bitField0_ |= 0x00000001;
        subReqID_ = value;
        onChanged();
        return this;
      }
      /**
       * <code>required int32 subReqID = 1;</code>
       * @return This builder for chaining.
       */
      public Builder clearSubReqID() {
        bitField0_ = (bitField0_ & ~0x00000001);
        subReqID_ = 0;
        onChanged();
        return this;
      }

      private int respCode_ ;
      /**
       * <code>required int32 respCode = 2;</code>
       * @return Whether the respCode field is set.
       */
      public boolean hasRespCode() {
        return ((bitField0_ & 0x00000002) != 0);
      }
      /**
       * <code>required int32 respCode = 2;</code>
       * @return The respCode.
       */
      public int getRespCode() {
        return respCode_;
      }
      /**
       * <code>required int32 respCode = 2;</code>
       * @param value The respCode to set.
       * @return This builder for chaining.
       */
      public Builder setRespCode(int value) {
        bitField0_ |= 0x00000002;
        respCode_ = value;
        onChanged();
        return this;
      }
      /**
       * <code>required int32 respCode = 2;</code>
       * @return This builder for chaining.
       */
      public Builder clearRespCode() {
        bitField0_ = (bitField0_ & ~0x00000002);
        respCode_ = 0;
        onChanged();
        return this;
      }

      private Object desc_ = "";
      /**
       * <code>required string desc = 3;</code>
       * @return Whether the desc field is set.
       */
      public boolean hasDesc() {
        return ((bitField0_ & 0x00000004) != 0);
      }
      /**
       * <code>required string desc = 3;</code>
       * @return The desc.
       */
      public String getDesc() {
        Object ref = desc_;
        if (!(ref instanceof String)) {
          com.google.protobuf.ByteString bs =
              (com.google.protobuf.ByteString) ref;
          String s = bs.toStringUtf8();
          if (bs.isValidUtf8()) {
            desc_ = s;
          }
          return s;
        } else {
          return (String) ref;
        }
      }
      /**
       * <code>required string desc = 3;</code>
       * @return The bytes for desc.
       */
      public com.google.protobuf.ByteString
          getDescBytes() {
        Object ref = desc_;
        if (ref instanceof String) {
          com.google.protobuf.ByteString b = 
              com.google.protobuf.ByteString.copyFromUtf8(
                  (String) ref);
          desc_ = b;
          return b;
        } else {
          return (com.google.protobuf.ByteString) ref;
        }
      }
      /**
       * <code>required string desc = 3;</code>
       * @param value The desc to set.
       * @return This builder for chaining.
       */
      public Builder setDesc(
          String value) {
        if (value == null) {
    throw new NullPointerException();
  }
  bitField0_ |= 0x00000004;
        desc_ = value;
        onChanged();
        return this;
      }
      /**
       * <code>required string desc = 3;</code>
       * @return This builder for chaining.
       */
      public Builder clearDesc() {
        bitField0_ = (bitField0_ & ~0x00000004);
        desc_ = getDefaultInstance().getDesc();
        onChanged();
        return this;
      }
      /**
       * <code>required string desc = 3;</code>
       * @param value The bytes for desc to set.
       * @return This builder for chaining.
       */
      public Builder setDescBytes(
          com.google.protobuf.ByteString value) {
        if (value == null) {
    throw new NullPointerException();
  }
  bitField0_ |= 0x00000004;
        desc_ = value;
        onChanged();
        return this;
      }
      @Override
      public final Builder setUnknownFields(
          final com.google.protobuf.UnknownFieldSet unknownFields) {
        return super.setUnknownFields(unknownFields);
      }

      @Override
      public final Builder mergeUnknownFields(
          final com.google.protobuf.UnknownFieldSet unknownFields) {
        return super.mergeUnknownFields(unknownFields);
      }


      // @@protoc_insertion_point(builder_scope:netty.SubscribeResp)
    }

    // @@protoc_insertion_point(class_scope:netty.SubscribeResp)
    private static final SubscribeResp DEFAULT_INSTANCE;
    static {
      DEFAULT_INSTANCE = new SubscribeResp();
    }

    public static SubscribeResp getDefaultInstance() {
      return DEFAULT_INSTANCE;
    }

    @Deprecated public static final com.google.protobuf.Parser<SubscribeResp>
        PARSER = new com.google.protobuf.AbstractParser<SubscribeResp>() {
      @Override
      public SubscribeResp parsePartialFrom(
          com.google.protobuf.CodedInputStream input,
          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
          throws com.google.protobuf.InvalidProtocolBufferException {
        return new SubscribeResp(input, extensionRegistry);
      }
    };

    public static com.google.protobuf.Parser<SubscribeResp> parser() {
      return PARSER;
    }

    @Override
    public com.google.protobuf.Parser<SubscribeResp> getParserForType() {
      return PARSER;
    }

    @Override
    public SubscribeResp getDefaultInstanceForType() {
      return DEFAULT_INSTANCE;
    }

  }

  private static final com.google.protobuf.Descriptors.Descriptor
    internal_static_netty_SubscribeResp_descriptor;
  private static final 
    com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
      internal_static_netty_SubscribeResp_fieldAccessorTable;

  public static com.google.protobuf.Descriptors.FileDescriptor
      getDescriptor() {
    return descriptor;
  }
  private static  com.google.protobuf.Descriptors.FileDescriptor
      descriptor;
  static {
    String[] descriptorData = {
      "\n\023SubscribeResp.proto\022\005netty\"A\n\rSubscrib" +
      "eResp\022\020\n\010subReqID\030\001 \002(\005\022\020\n\010respCode\030\002 \002(" +
      "\005\022\014\n\004desc\030\003 \002(\tBJ\n4club.wujingjian.com.w" +
      "ujingjian.netty.serial.java.vo2B\022Subscri" +
      "beRespProto"
    };
    descriptor = com.google.protobuf.Descriptors.FileDescriptor
      .internalBuildGeneratedFileFrom(descriptorData,
        new com.google.protobuf.Descriptors.FileDescriptor[] {
        });
    internal_static_netty_SubscribeResp_descriptor =
      getDescriptor().getMessageTypes().get(0);
    internal_static_netty_SubscribeResp_fieldAccessorTable = new
      com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
        internal_static_netty_SubscribeResp_descriptor,
        new String[] { "SubReqID", "RespCode", "Desc", });
  }

  // @@protoc_insertion_point(outer_class_scope)
}

测试类: TestSubscribeReqProto.java

package club.wujingjian.com.wujingjian.netty.serial.protobuf.vo2;

import com.google.protobuf.InvalidProtocolBufferException;

public class TestSubscribeReqProto {

    private static byte[] encode(SubscribeReqProto.SubscribeReq req) {
        return req.toByteArray();
    }

    private static SubscribeReqProto.SubscribeReq decode(byte[] body) throws InvalidProtocolBufferException {
        return SubscribeReqProto.SubscribeReq.parseFrom(body);
    }

    private static SubscribeReqProto.SubscribeReq createSubscribeReq() {
        SubscribeReqProto.SubscribeReq.Builder builder = SubscribeReqProto.SubscribeReq.newBuilder();
        builder.setSubReqID(1);
        builder.setUserName("wujingjian");
        builder.setProductName("Netty Book");
        builder.setAddress("BeiJing");
        return  builder.build();
    }

    public static void main(String[] args) throws InvalidProtocolBufferException {
        SubscribeReqProto.SubscribeReq req = createSubscribeReq();
        System.out.println("Before encode :" + req.toString());
        SubscribeReqProto.SubscribeReq req2 = decode(encode(req));
        System.out.println("After decode :" + req.toString());
        System.out.println("Assert equal : --> " + req2.equals(req)); // true
    }
}

server 端:
SubReqServer.java

package club.wujingjian.com.wujingjian.netty.serial.protobuf.server;

import club.wujingjian.com.wujingjian.netty.serial.protobuf.vo2.SubscribeReqProto;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.protobuf.ProtobufDecoder;
import io.netty.handler.codec.protobuf.ProtobufEncoder;
import io.netty.handler.codec.protobuf.ProtobufVarint32FrameDecoder;
import io.netty.handler.codec.protobuf.ProtobufVarint32LengthFieldPrepender;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;

public class SubReqServer {

    public  void bind(int port) throws Exception {
        EventLoopGroup bossGroup = new NioEventLoopGroup();
        EventLoopGroup workerGroup = new NioEventLoopGroup();
        try {
            ServerBootstrap b = new ServerBootstrap();
            b.group(bossGroup, workerGroup)
                    .channel(NioServerSocketChannel.class)
                    .option(ChannelOption.SO_BACKLOG,100)
                    .handler(new LoggingHandler(LogLevel.INFO))
                    .childHandler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel socketChannel) throws Exception {
                            //处理半包
                            socketChannel.pipeline().addLast(new ProtobufVarint32FrameDecoder());
                            //ProtobufDecoder()中参数是com.google.protobuf.MessageLite,实际上就是告诉ProtobufDecoder需要解码的目标类是什么
                            socketChannel.pipeline().addLast(new ProtobufDecoder(SubscribeReqProto.SubscribeReq.getDefaultInstance()));
                            socketChannel.pipeline().addLast(new ProtobufVarint32LengthFieldPrepender());
                            socketChannel.pipeline().addLast(new ProtobufEncoder());
                            socketChannel.pipeline().addLast(new SubReqServerHandler());
                        }
                    });

            ChannelFuture f = b.bind(port).sync();
            f.channel().closeFuture().sync();
        } finally {
            bossGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }
    }

    public static void main(String[] args) throws Exception {
        int port = 8080;
        if (args != null && args.length > 0) {
            port = Integer.parseInt(args[0]);
        }
        new SubReqServer().bind(port);

    }
}

SubReqServerHandler.java

package club.wujingjian.com.wujingjian.netty.serial.protobuf.server;

import club.wujingjian.com.wujingjian.netty.serial.protobuf.vo2.SubscribeReqProto;
import club.wujingjian.com.wujingjian.netty.serial.protobuf.vo2.SubscribeRespProto;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;

public class SubReqServerHandler extends ChannelHandlerAdapter {

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        SubscribeReqProto.SubscribeReq req = (SubscribeReqProto.SubscribeReq) msg;
        if ("wujingjian".equalsIgnoreCase(req.getUserName())) {
            System.out.println("Service accept client subscribe req : [ " + req.toString() + "]");
            ctx.writeAndFlush(resp(req.getSubReqID()));
        }
    }

    private SubscribeRespProto.SubscribeResp resp(int subReqID) {
        SubscribeRespProto.SubscribeResp.Builder builder = SubscribeRespProto.SubscribeResp.newBuilder();
        builder.setSubReqID(subReqID);
        builder.setRespCode(0);
        builder.setDesc("Netty Book order succeed");
        return builder.build();
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        cause.printStackTrace();;
        ctx.close();
    }
}

client 端:SubReqClient.java

package club.wujingjian.com.wujingjian.netty.serial.protobuf.client;

import club.wujingjian.com.wujingjian.netty.serial.protobuf.vo2.SubscribeRespProto;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.protobuf.ProtobufDecoder;
import io.netty.handler.codec.protobuf.ProtobufEncoder;
import io.netty.handler.codec.protobuf.ProtobufVarint32FrameDecoder;
import io.netty.handler.codec.protobuf.ProtobufVarint32LengthFieldPrepender;

public class SubReqClient {

    public void connect(int port, String host) throws Exception {
        EventLoopGroup group = new NioEventLoopGroup();
        try {
            Bootstrap b = new Bootstrap();
            b.group(group).channel(NioSocketChannel.class)
                    .option(ChannelOption.TCP_NODELAY,true)
                    .handler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel socketChannel) throws Exception {
                            socketChannel.pipeline().addLast(new ProtobufVarint32FrameDecoder());
                            socketChannel.pipeline().addLast(new ProtobufDecoder(SubscribeRespProto.SubscribeResp.getDefaultInstance()));
                            socketChannel.pipeline().addLast(new ProtobufVarint32LengthFieldPrepender());
                            socketChannel.pipeline().addLast(new ProtobufEncoder());
                            socketChannel.pipeline().addLast(new SubReqClientHandler());
                        }
                    });
            ChannelFuture f = b.connect(host,port).sync();
            f.channel().closeFuture().sync();
        } finally {
            group.shutdownGracefully();
        }
    }

    public static void main(String[] args) throws Exception {
        int port = 8080;
        if (args != null && args.length > 0) {
            port = Integer.parseInt(args[0]);
        }
        new SubReqClient().connect(port, "127.0.0.1");
    }
}

SubReqClientHandler.java

package club.wujingjian.com.wujingjian.netty.serial.protobuf.client;

import club.wujingjian.com.wujingjian.netty.serial.java.vo.SubscribeReq;
import club.wujingjian.com.wujingjian.netty.serial.protobuf.vo2.SubscribeReqProto;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;

public class SubReqClientHandler extends ChannelHandlerAdapter {

    public SubReqClientHandler(){}

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        for (int i = 0; i < 10; i++) {
            ctx.write(subReq(i));
        }
        ctx.flush();
    }

    private SubscribeReqProto.SubscribeReq subReq(int i) {
        SubscribeReqProto.SubscribeReq.Builder build = SubscribeReqProto.SubscribeReq.newBuilder();
        build.setAddress("abc地址");
        build.setProductName("Netty abc权威指南");
        build.setSubReqID(i);
        build.setUserName("wujingjian");
        return build.build();
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        System.out.println("Receive server response :[" + msg +" ]");
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
        ctx.flush();
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        cause.printStackTrace();;
        ctx.close();
    }
}

但是对中文输出有问题,
server 端输出:
image.png

client 端输出:

image.png

  • Netty

    Netty 是一个基于 NIO 的客户端-服务器编程框架，使用 Netty 可以让你快速、简单地开发出一个可维护、高性能的网络应用，例如实现了某种协议的客户、服务端应用。

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  • 微软

    微软是一家美国跨国科技公司，也是世界 PC 软件开发的先导，由比尔·盖茨与保罗·艾伦创办于 1975 年，公司总部设立在华盛顿州的雷德蒙德（Redmond，邻近西雅图）。以研发、制造、授权和提供广泛的电脑软件服务业务为主。

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    Github 地址：https://github.com/Hi-Windom/Sillot

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  • 创造

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    下一代的社区系统，为未来而构建

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    CentOS（Community Enterprise Operating System）是 Linux 发行版之一，它是来自于 Red Hat Enterprise Linux 依照开放源代码规定释出的源代码所编译而成。由于出自同样的源代码，因此有些要求高度稳定的服务器以 CentOS 替代商业版的 Red Hat Enterprise Linux 使用。两者的不同在于 CentOS 并不包含封闭源代码软件。

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    📙 前端知识精选集，包含 HTML、CSS、JavaScript、React、Node、安全等方面，每天仅需 30 秒。

    • 精选常见面试题，帮助您准备下一次面试
    • 精选常见交互，帮助您拥有简洁酷炫的站点
    • 精选有用的 React 片段，帮助你获取最佳实践
    • 精选常见代码集，帮助您提高打码效率
    • 整理前端界的最新资讯，邀您一同探索新世界
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  • Windows

    Microsoft Windows 是美国微软公司研发的一套操作系统，它问世于 1985 年，起初仅仅是 Microsoft-DOS 模拟环境，后续的系统版本由于微软不断的更新升级，不但易用，也慢慢的成为家家户户人们最喜爱的操作系统。

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