android socket DataOutputStream.writeUTF [英] android socket DataOutputStream.writeUTF

问题描述

我写套接字客户端：

clientSocket = new Socket("192.168.1.102", 15780);
outToServer = new DataOutputStream(clientSocket.getOutputStream());

一切正常。但我不会发送到服务器 UTF -8格式的消息并执行此操作：

All works. But I wont to send to server UTF-8 format messages and do so:

outToServer.writeBytes("msg#");//server tag
outToServer.writeUTF("hello");
//outToServer.writeUTF(str); //or another string
outToServer.writeBytes("\n");
outToServer.flush();

消息变为：

请告诉我，为什么？如何正确发送UTF消息？

Tell me please why? How correctly send UTF messages?

推荐答案

writeUTF（）文档说：

首先，将两个字节写入输出流，就好像writeShort方法一样，给出了要遵循的字节数。该值是实际写出的字节数，而不是字符串的长度。

First, two bytes are written to the output stream as if by the writeShort method giving the number of bytes to follow. This value is the number of bytes actually written out, not the length of the string.

您可以自己将字符串编码为utf-8，然后使用 写（ ） ：

You can encode the string as utf-8 yourself and then send the resulting byte array to the server using write():

byte[] buf = "hello".getBytes("UTF-8");
outToServer.write(buf, 0, buf.length);

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