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String contents="test";
IoBuffer buffer = IoBuffer.allocate( 4 + contents.length, false);
//buffer.order(ByteOrder.BIG_ENDIAN);
buffer.putInt(contents.length); //java里面int占4个字节,存放contents的长度
buffer.put(content.getBytes());
byte[] contents = content.getBytes(Charset.forName("UTF-8"));
IoBuffer buffer = IoBuffer.allocate( 4 + contents.length, false);
//buffer.order(ByteOrder.BIG_ENDIAN);
buffer.putInt(contents.length);
buffer.put(content.getBytes());
buffer.flip();
out.write(buffer);