网络即时通信系统

				import java.awt.*;
				import java.awt.event.*;
				import javax.swing.*;
				import java.net.*;
				import java.io.*;
				public class New extends JFrame {//登录窗口类
				  JPanel contentPane;
				//*****************
				 String server;//服务器名
				 int serport;//端口
				  private Socket socket;
				private BufferedReader in;//输入输出流
				private PrintWriter out;
				//***********//程序界面
				  JPanel jPanel1 = new JPanel();
				  JLabel jLabel1 = new JLabel();
				  JLabel jLabel2 = new JLabel();
				  JTextField jicq = new JTextField();
				  JLabel jLabel3 = new JLabel();
				  JPasswordField password = new JPasswordField();
				  JPanel jPanel2 = new JPanel();
				  JButton login = new JButton();
				  JButton newuser = new JButton();
				  JButton quit = new JButton();
				  JLabel jLabel6 = new JLabel();
				  JTextField servername = new JTextField();
				  JLabel jLabel7 = new JLabel();
				  JTextField serverport = new JTextField();
				  //构造方法
				  public New() {
				    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
				      try {   jbInit();
				      server=servername.getText().toString().trim();
				   serport=Integer.parseInt(serverport.getText().trim());
				    } catch(Exception e) { e.printStackTrace(); }
				  }
				  
				  private void jbInit() throws Exception  {
				    contentPane = (JPanel) this.getContentPane();
				    contentPane.setLayout(null);
				    this.setResizable(false);
				    this.setSize(new Dimension(344, 245));
				    this.setTitle("New JICQ");
				    //contentPane.add(text, null);
				    jPanel1.setBounds(new Rectangle(2, 3, 348, 110));
				    jPanel1.setLayout(null);
				    jLabel1.setText("请输入你的信息");
				    jLabel1.setBounds(new Rectangle(5, 7, 103, 18));
				    jLabel2.setText("你的Jicq");
				    jLabel2.setBounds(new Rectangle(7, 66, 58, 18));
				    jicq.setBounds(new Rectangle(68, 65, 97, 22));
				    jLabel3.setText("你的密码");
				    jLabel3.setBounds(new Rectangle(173, 66, 67, 18));
				    password.setBounds(new Rectangle(237, 63, 94, 22));
				    jPanel2.setBounds(new Rectangle(8, 154, 347, 151));
				    jPanel2.setLayout(null);
				    login.setText("登录");
				    login.setBounds(new Rectangle(5, 27, 79, 29));
				    login.addMouseListener(new java.awt.event.MouseAdapter() {
				      public void mouseClicked(MouseEvent e) {
				        login_mouseClicked(e);
				      }
				    });
				    newuser.setText("新建");
				    newuser.setBounds(new Rectangle(118, 28, 79, 29));
				    newuser.addMouseListener(new java.awt.event.MouseAdapter() {
				      public void mouseClicked(MouseEvent e) {
				        newuser_mouseClicked(e);
				      }
				    });
				    quit.setText("退出");
				    quit.setBounds(new Rectangle(228, 26, 79, 29));
				    quit.addMouseListener(new java.awt.event.MouseAdapter() {
				      public void mouseClicked(MouseEvent e) {
				        quit_mouseClicked(e);
				      }
				    });
				    jLabel6.setText("服务器");
				    jLabel6.setBounds(new Rectangle(20, 132, 41, 18));
				    servername.setText("0.0.0.0");
				    servername.setBounds(new Rectangle(73, 135, 102, 22));
				    jLabel7.setText("端口");
				    jLabel7.setBounds(new Rectangle(191, 137, 41, 18));
				    serverport.setText("8080");
				    serverport.setBounds(new Rectangle(241, 131, 90, 30));
				    contentPane.add(jPanel1, null);
				    jPanel1.add(jLabel1, null);
				    jPanel1.add(jLabel2, null);
				    jPanel1.add(jicq, null);
				    jPanel1.add(jLabel3, null);
				    jPanel1.add(password, null);
				    contentPane.add(jPanel2, null);
				    jPanel2.add(login, null);
				    jPanel2.add(quit, null);
				    jPanel2.add(newuser, null);
				    contentPane.add(jLabel6, null);
				    contentPane.add(servername, null);
				    contentPane.add(jLabel7, null);
				    contentPane.add(serverport, null);
				  }
				  protected void processWindowEvent(WindowEvent e) {
				    super.processWindowEvent(e);
				    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
				      System.exit(0);
				    }
				  }
				 public static void main(String[] args) {//主程序
				 New f=new New();
				 f.setVisible(true);
				
				}
				
				  void login_mouseClicked(MouseEvent e) {//登录按扭
				
				      try{Socket socket=new Socket(InetAddress.getByName(server),serport);//连接服务器
				
				      BufferedReader in=new BufferedReader(new InputStreamReader(socket.getInputStream()));
				      PrintWriter out=new PrintWriter(new BufferedWriter(
				                              new OutputStreamWriter(socket.getOutputStream())),true);
				out.println("login");//告诉服务器我要登录
				out.println(jicq.getText());
				out.println(password.getPassword());
				
				 String str=" ";
				      //do{
				        str=in.readLine().trim();//从服务器读取消息
				        //如果失败就告诉出错
				        if(str.equals("false")) JOptionPane.showMessageDialog(this,"对不起，出错了:-(","ok",JOptionPane.INFORMATION_MESSAGE);
				       else{//如果成功就打开主程序
				       this.dispose();
				            int g=Integer.parseInt(jicq.getText());
				            MainWin f2=new MainWin(g,server,serport);
				            f2.setVisible(true);
				       }
				
				        //System.out.println("\n");
				        //}while(!str.equals("ok"));
				    }catch(IOException e1){}
				  }
				
				  void newuser_mouseClicked(MouseEvent e) {//新建用户按纽
				  this.dispose();
				JDialog d=new Register(server,serport);//打开新建窗口
				d.pack();
				d.setLocationRelativeTo(this);
				d.setSize(400,400);
				d.show();
				  }
				
				  void quit_mouseClicked(MouseEvent e) {//关闭按扭
				this.dispose();
				  System.exit(0);
				  }
				
				
				}