Java AWT实现的简单的多人在线聊天室

客户端：

package Client; import java.awt.*; import java.awt.event.*; import java.io.*; import java.net.*; public class ChatClient { public static void main(String[] args) { new Myframe(); } } class Myframe extends Frame { TextField text1; TextArea text2; Socket socket; ServerSocket serversocket; boolean Con=false; String str=null; DataInputStream ini=null; DataOutputStream outo=null; Myframe() { super("聊天室客户端"); setVisible(true); setBounds(200,200,300,500); addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { setVisible(true); if(socket!=null) { try { socket.close(); } catch(IOException ae) { ae.printStackTrace(); } } if(serversocket!=null) { try { serversocket.close(); } catch(IOException ae) { ae.printStackTrace(); } } try { ini.close(); } catch (IOException e1) { e1.printStackTrace(); } try { outo.close(); } catch (IOException e1) { e1.printStackTrace(); } System.exit(0); } } ); text2=new TextArea(25,10); text2.setBackground(Color.magenta); add(text2,"North"); text1=new TextField(20); text1.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { str=text1.getText(); text2.append("/n"+"Client:"+str); text1.setText(""); if(Con) { try { outo.writeUTF(str); outo.flush(); } catch (IOException e1) { e1.printStackTrace(); } } } } ); add(text1,"South"); Connect(); Mythread mm=new Mythread(); Thread tt=new Thread(mm); tt.start(); } public void Connect() { try { text2.setText("正在尝试连接服务器...."); socket=new Socket("127.0.0.1",8888); text2.append("/n"+"已经自动连接上"); ini=new DataInputStream(socket.getInputStream()); outo=new DataOutputStream(socket.getOutputStream()); Con=true; } catch (Exception ae) { ae.printStackTrace(); } } class Mythread implements Runnable { public void run() { while(Con) { String strstr=null; try{ strstr=ini.readUTF(); } catch(IOException ae) { text2.append("/n"+"已和服务器断开连接"); text2.append("/n"+"3秒后程序自动关闭"); try { Thread.sleep(3000); } catch (InterruptedException e) { e.printStackTrace(); } System.exit(-1); } if(!(strstr.equals("A Client said:"+str))) { text2.append("/n"+"Server:"+strstr); } } } } }

服务器端：

package Server; import java.awt.*; import java.awt.event.*; import java.net.*; import java.util.*; import java.io.*; public class ChatServer { public static void main(String[] args) { new Myframe(); } } class Myframe extends Frame { TextField text1; TextArea text2; Socket socket; boolean Con=false; ServerSocket serversocket; ArrayList<Client> clients=new ArrayList<Client>(); Myframe() { super("聊天室服务器端"); setVisible(true); setBounds(200,200,300,500); addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { setVisible(true); if(socket!=null) { try { socket.close(); } catch (IOException e1) { e1.printStackTrace(); } } if(serversocket!=null) { try { serversocket.close(); } catch (IOException e1) { e1.printStackTrace(); } } for(int i=0;i<clients.size();i++) { Client ccc=clients.get(i); ccc.disopen(); } System.exit(0); } } ); text2=new TextArea(25,10); text2.setBackground(Color.magenta); add(text2,"North"); text1=new TextField(20); text1.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { String str=text1.getText(); text2.append("/n"+"Server:"+str); Mythread mm=new Mythread(); Thread tt=new Thread(mm); tt.start(); } } ); add(text1,"South"); start(); } class Mythread implements Runnable { public void run() { String str3=text1.getText(); for(int i=0;i<clients.size();i++) { Client cc=clients.get(i); cc.send(str3); } text1.setText(""); } } public void start() { try { serversocket=new ServerSocket(8888); text2.setText("服务器正在等待客户连接中 。。。"); Con=true; } catch(IOException ae) { ae.printStackTrace(); text2.setText("服务器启动失败"); //System.exit(0); } while(Con) { try { socket=serversocket.accept(); Client client=new Client(); Thread t=new Thread(client); t.start(); clients.add(client); text2.append("/n"+"已连接上"+clients.size()+"个客户"); } catch(Exception ae) { System.out.println("服务器已被关闭"); break; } } } class Client implements Runnable { DataInputStream in3=null; DataOutputStream out3=null; Client() { try { in3=new DataInputStream(socket.getInputStream()); out3=new DataOutputStream(socket.getOutputStream()); } catch(Exception ae) { ae.printStackTrace(); } } public void send(String str1) { try { out3.writeUTF(str1); out3.flush(); } catch (IOException e) { e.printStackTrace(); } } public void disopen() { try { in3.close(); } catch (IOException e) { e.printStackTrace(); } try { out3.close(); } catch (IOException e) { e.printStackTrace(); } } public void run() { while(true) { String str2=null; try { str2=in3.readUTF(); text2.append("/n"+"Client:"+str2); } catch (IOException ae) { try { clients.remove(this); text2.append("/n"+"一客户已退出聊天室"); text2.append("/n"+"已连接上"+clients.size()+"个客户"); in3.close(); out3.close(); } catch(Exception e) { e.printStackTrace(); } break; } for(int i=0;i<clients.size();i++) { Client c=clients.get(i); c.send("A Client said:"+str2); } } } } }

写这个简单的Java版多人聊天室纯为了巩固Java SE基础（暂不考虑界面美化和个性化功能等细节），因为这样一个小应用程序综合应用了多线程、网络（TCP）、AWT、IO等众多重量级知识点，所谓“麻雀虽小，五脏俱全”~~~O(∩_∩)O~

Jar文件及源码下载地址：http://download.youkuaiyun.com/source/2616662