java socket乱码

解决方法：

首先在服务端使用InputStreamReader指定客户端的输入流为utf-8编码，以及使用OutputStreamWriter指定输出流为utf-8编码；

然后在客户端同样的设置utf-8编码即可。

in = new BufferedReader(new InputStreamReader(socket.getInputStream(),"UTF-8"));out = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(),"UTF-8"));

示例：

Server：

import java.io.*;import java.net.*; public class SocketServerEx1 {public static void main(String args[]) {System.out.println("Server");ServerSocket serverSocket = null;Socket clientSocket = null;int connects = 0;try {serverSocket = new ServerSocket(82, 5);//端口：82，最大链接数：5 //最多连接10次while(connects < 10) {connects++;System.out.println("--------------------等待连接--------------------------");clientSocket = serverSocket.accept();//等待连接System.out.println("第 " + connects + " 次连接");ServiceClient(clientSocket);} serverSocket.close();} catch(IOException ioe) {System.out.println("Error: " + ioe);}}public static void ServiceClient(Socket client) throws IOException {System.out.println("已链接");InputStreamReader inSR = null;OutputStreamWriter outSW = null;try {//读取数据inSR = new InputStreamReader(client.getInputStream(), "UTF-8");BufferedReader br = new BufferedReader(inSR);outSW = new OutputStreamWriter(client.getOutputStream(), "UTF-8");BufferedWriter bw = new BufferedWriter(outSW);String str = "";while((str = br.readLine()) != null) {str = str.trim();System.out.println("收到客户端消息：" + str);bw.write("已收到信息：" + str + " \r\n");//向客户端反馈消息，加上分行符以便客户端接收bw.flush();} } finally {//System.out.println("Cleaning up connection: " + client);inSR.close();outSW.close();client.close();}System.out.println("已断开");}}

Client：

import java.io.*;import java.net.*; public class SocketClientEx1 {public static void main(String[] args) {System.out.println("Client");try {Socket clientSocket = new Socket("localhost", 82);System.out.println("Client1:" + clientSocket); DataInputStream dataIS = new DataInputStream(clientSocket.getInputStream());InputStreamReader inSR = new InputStreamReader(dataIS, "UTF-8");BufferedReader br = new BufferedReader(inSR);DataOutputStream dataOS = new DataOutputStream(clientSocket.getOutputStream());OutputStreamWriter outSW = new OutputStreamWriter(dataOS, "UTF-8");BufferedWriter bw = new BufferedWriter(outSW); //输入信息byte bytes[] = new byte[100];while(true) {System.out.println("----------------------------------");System.in.read(bytes);String str = new String(bytes);str = str.trim();if (str == "exit") {break;} //发送数据bw.write(str + "\r\n");//加上分行符，以便服务器按行读取bw.flush();//接收数据while((str = br.readLine()) != null) {str = str.trim();System.out.println("服务器回复：" + str);break;} }inSR.close();dataIS.close();dataOS.close();clientSocket.close();} catch(UnknownHostException uhe) {System.out.println("Error:" + uhe.getMessage());} catch(ConnectException ce) {System.out.println("Error:" + ce.getMessage());} catch(IOException ioe) {System.out.println("Error:" + ioe.getMessage());} finally {}}}

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