本文实例讲述了Java使用TCP套接字实现多人聊天功能。分享给大家供大家参考，具体如下：

废话不多说，直接开搞：

先创建一个服务端：

package interWebWriterEven2;import java.net.ServerSocket;import java.net.Socket;import java.util.ArrayList;/** * 服务端 * @author * */public class ServiceT { static ArrayList<Socket> list = new ArrayList<Socket>(); public static void main(String[] args) { ServerSocket server; try { server = new ServerSocket(9999); while(true){ Socket socket = server.accept(); System.out.println(socket.getInetAddress().getHostName()+"连接成功。IP："+socket.getInetAddress().getHostAddress()); list.add(socket); ServiceThreadT t =new ServiceThreadT(socket); t.start(); } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } }}

接着是服务端的线程：

package interWebWriterEven2;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.FileOutputStream;import java.io.InputStreamReader;import java.io.OutputStreamWriter;import java.net.Socket;/** * 服务端线程 * @author * */public class ServiceThreadT extends Thread{ private Socket socket; public Socket getSocket() { return socket; } public void setSocket(Socket socket) { this.socket = socket; } public ServiceThreadT(Socket socket) { super(); this.socket = socket; } @Override public void run() { try { @SuppressWarnings("resource") BufferedWriter wFile = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("D://messagesT.txt",true))); BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream())); String strOut = ""; String strIn = ""; while(true){ strIn = socket.getInetAddress().getHostName()+":"+br.readLine(); strOut = strIn; wFile.write(strIn); wFile.newLine(); wFile.flush(); for (Socket soc : ServiceT.list) { if(soc != socket){ BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(soc.getOutputStream())); bw.write(strOut); System.out.println(strOut); bw.newLine(); bw.flush(); } } } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } }}

然后是客户端（应用端）：

package interWebWriterEven2;import java.io.BufferedReader;import java.io.InputStreamReader;import java.net.Socket;/** * 客户端 * @author * */public class ClientT { public static void main(String[] args) { try { Socket socket = new Socket("127.0.0.1",9999); ClientThreadT t = new ClientThreadT(socket); t.start(); BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream())); String strIn = ""; while(true){ strIn = br.readLine(); System.out.println(strIn); } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } }}

最后是客户端的线程：

package interWebWriterEven2;import java.io.BufferedWriter;import java.io.IOException;import java.io.OutputStreamWriter;import java.net.Socket;import java.util.Scanner;/** * 客户端的线程 * @author * */public class ClientThreadT extends Thread{ private Socket socket; public Socket getSocket() { return socket; } public void setSocket(Socket socket) { this.socket = socket; } public ClientThreadT(Socket socket) { super(); this.socket = socket; } @Override public void run() { @SuppressWarnings("resource") Scanner sc = new Scanner(System.in); try { BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())); while(true){ System.out.println(); bw.write(sc.nextLine().trim()); bw.newLine(); bw.flush(); } } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } }}

先运行服务端哦，否则将会报空指针异常的。

更多关于java相关内容感兴趣的读者可查看本站专题：《Java Socket编程技巧总结》、《Java文件与目录操作技巧汇总》、《Java数据结构与算法教程》、《Java操作DOM节点技巧总结》和《Java缓存操作技巧汇总》

希望本文所述对大家java程序设计有所帮助。