JAVA 的BBS的开发案例

import java.io.*; import java.net.*; import java.util.*; public class ChatServer { boolean started = false; ServerSocket ss = null; List<Client> clients = new ArrayList<Client>(); public static void main(String[] args) { new ChatServer().start(); } public void start() { try { ss = new ServerSocket(8888); started = true; } 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); //dis.close(); } } catch (IOException e) { e.printStackTrace(); } finally { try { ss.close(); } catch (IOException e) { // TODO Auto-generated catch block 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！"); //e.printStackTrace(); } } public void run() { try { while(bConnected) { String str = dis.readUTF(); System.out.println(str); for(int i=0; i<clients.size(); i++) { Client c = clients.get(i); c.send(str); //System.out.println(" a string send !"); } /* for(Iterator<Client> it = clients.iterator(); it.hasNext(); ) { Client c = it.next(); c.send(str); } */ /* Iterator<Client> it = clients.iterator(); while(it.hasNext()) { Client c = it.next(); 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(); //s = null; } } catch (IOException e1) { e1.printStackTrace(); } } } } }