Java IO

Java IO 常用操作

file to byte[]

IOUtils.toByteArray(InputStream input)

import java.nio.file.Files;
import java.nio.file.Paths;
import java.nio.file.Path;

Path path = Paths.get("path/to/file");
byte[] data = Files.readAllBytes(path);

import java.io.RandomAccessFile;
RandomAccessFile f = new RandomAccessFile(fileName, "r");
byte[] b = new byte[(int)f.length()];
f.readFully(b);

byte[] array = Files.readAllBytes(new File("/path/to/file").toPath());

byte[] to file

FileUtils.writeByteArrayToFile(new File("pathname"), myByteArray)

FileOutputStream fos = new FileOutputStream("pathname");
fos.write(myByteArray);
fos.close();

FileOutputStream stream = new FileOutputStream(path);
try {
    stream.write(bytes);
} finally {
    stream.close();
}

FileUtils.writeByteArrayToFile(new File(path), bytes);

待更新