Java socket长连接

服务器端：

import java.io.*;
import java.net.*;
import java.util.*;

public class ChatServer {
	boolean started = false;
	ServerSocket ss = null;
	List clients = new ArrayList(); public static void main(String[] args) { new ChatServer().start(); } public void start() { try { ss = new ServerSocket(8888); started = true; System.out.println("端口已开启,占用8888端口号...."); } catch (BindException e) { System.out.println("端口使用中...."); System.out.println("请关掉相关程序并重新运行服务器！"); System.exit(0); } catch (IOException e) { e.printStackTrace(); } try { while (started) { Socket s = ss.accept(); Client c = new Client(s); System.out.println("a client connected!"); new Thread(c).start(); clients.add(c); } } catch (IOException e) { e.printStackTrace(); } finally { try { ss.close(); } catch (IOException e) { e.printStackTrace(); } } } class Client implements Runnable { private Socket s; private DataInputStream dis = null; private DataOutputStream dos = null; private boolean bConnected = false; public Client(Socket s) { this.s = s; try { dis = new DataInputStream(s.getInputStream()); dos = new DataOutputStream(s.getOutputStream()); bConnected = true; } catch (IOException e) { e.printStackTrace(); } } public void send(String str) { try { dos.writeUTF(str); } catch (IOException e) { clients.remove(this); System.out.println("对方退出了！我从List里面去掉了！"); } } public void run() { try { while (bConnected) { String str = dis.readUTF(); System.out.println("------------来自本地服务器:" + str); for (int i = 0; i < clients.size(); i++) { Client c = clients.get(i); c.send(str); } } } catch (EOFException e) { System.out.println("Client closed!"); } catch (IOException e) { e.printStackTrace(); } finally { try { if (dis != null) dis.close(); if (dos != null) dos.close(); if (s != null) { s.close(); } } catch (IOException e1) { e1.printStackTrace(); } } } } }

客户端：

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;

 public class ChatClient extends Frame { Socket s = null; DataOutputStream dos = null; DataInputStream dis = null; private boolean bConnected = false; TextField tfTxt = new TextField(); TextArea taContent = new TextArea(); Thread tRecv = new Thread(new RecvThread()); public static void main(String[] args) { new ChatClient().launchFrame(8888); } public void launchFrame(int port) { setLocation(400, 300); this.setSize(300, 300); add(tfTxt, BorderLayout.SOUTH); add(taContent, BorderLayout.NORTH); pack(); this.addWindowListener(new WindowAdapter() { @Override public void windowClosing(WindowEvent arg0) { disconnect(); System.exit(0); } }); tfTxt.addActionListener(new TFListener()); setVisible(true); connect(port); tRecv.start(); } public void connect(int port) { try { s = new Socket("127.0.0.1", port); dos = new DataOutputStream(s.getOutputStream()); dis = new DataInputStream(s.getInputStream()); System.out.println("~~~~~~~~连接成功~~~~~~~~!"); bConnected = true; } catch (UnknownHostException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } public void disconnect() { try { dos.close(); dis.close(); s.close(); } catch (IOException e) { e.printStackTrace(); } } private class TFListener implements ActionListener { public void actionPerformed(ActionEvent e) { String str = tfTxt.getText().trim(); tfTxt.setText(""); try { dos.writeUTF(str); dos.flush(); } catch (IOException e1) { e1.printStackTrace(); } } } private class RecvThread implements Runnable { public void run() { try { while (bConnected) { String str = dis.readUTF(); taContent.setText(taContent.getText() + str + '\n'); } } catch (SocketException e) { System.out.println("退出了，bye!"); } catch (EOFException e) { System.out.println("退出了，bye!"); } catch (IOException e) { e.printStackTrace(); } } } }