ICQ/即时通讯

开发平台：
Java

ClientFrame.java：源码内容
							
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;
public class ClientFrame extends JFrame
{
	private JButton jbdenglu;
	private JButton jbxiaxian;
	private Socket socket;
	private JComboBox combobox;
	private JTextArea jtextarea;
        private JScrollPane jp;
	private JTextField message;
	ObjectOutputStream output;
	ObjectInputStream input;
	private ClientThread clientthread;
    public ClientFrame()
	{
		
		
		super("Client Frame");
		jbdenglu=new JButton("登陆");
		jbxiaxian=new JButton("下线");
		jbxiaxian.setEnabled(false);
		
		
		jbdenglu.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent e)
			{
				denglu();
			}
		});
		jbxiaxian.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent e)
			{
				xiaxian();
			}
		});
		
		
		combobox=new JComboBox();
		combobox.insertItemAt("all", 0);
		combobox.setSelectedIndex(0);
		
		
		jtextarea=new JTextArea(20,20);
		jtextarea.setEditable(false);
                jp=new JScrollPane(jtextarea);
		jtextarea.setText("请输入您的用户名");
		message=new JTextField(40);
		message.setEditable(true);
		
		message.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent e)
			{
				sendmessage();
			}
		});
		
		
		this.addWindowListener(new WindowAdapter()
		{
			public void windowClosing(WindowEvent e)
			{
				xiaxian();
				System.exit(0);
			}
		});
		
		Container c=getContentPane();
		c.setLayout(null);
		
		jbdenglu.setBounds(30,30,90,30);
		jbxiaxian.setBounds(150,30,90,30);
		jp.setBounds(30,110,300,300);
		combobox.setBounds(30,425,90,30);
		message.setBounds(30,470,300,30);
		
		c.add(jbdenglu,null);
		c.add(jbxiaxian,null);
		c.add(jp,null);
		c.add(combobox,null);
		c.add(message,null);
		
		setSize(370,570);
		setVisible(true);
	}
    public void denglu()
    {
    	try
    	{
    		socket=new Socket("222.206.113.21",8000);
    		output=new ObjectOutputStream(socket.getOutputStream());
    		output.flush();
    		input=new ObjectInputStream(socket.getInputStream());
    		String msg=message.getText();
    		output.writeObject(msg);
    		output.flush();
    		clientthread=new ClientThread(socket,input,combobox,jtextarea);
    		clientthread.start();
    		jbdenglu.setEnabled(false);
    		jbxiaxian.setEnabled(true);
    		message.setEditable(true);
    		message.setText("");
    		jtextarea.setText("您已成功上线"+"n");
    	}catch(Exception e){}
    }
    public void xiaxian()
    {
    	jbdenglu.setEnabled(true);
    	jbxiaxian.setEnabled(false);
    	jtextarea.setText("请输入您的用户名");
    	try
    	{
    		output.writeObject("closed");
    		output.flush();
    		output.writeObject("closed");
    		output.flush();
    		input.close();
    		output.close();
    		socket.close();
    	}catch(Exception e){}
    }
   public void sendmessage()
    {
    	try
    	{
    		String tosombody=combobox.getSelectedItem().toString();
    		String msg=message.getText();
    		message.setText("");
        	output.writeObject(tosombody);
        	output.flush();
        	output.writeObject(msg);
        	output.flush();
    	}catch(Exception e){}
    	
    }
    public class ClientThread extends Thread
    {
    	JComboBox combobox;
    	JTextArea jtextarea;
    	Socket socket;
    	ObjectInputStream input;
    	public ClientThread(Socket socket,ObjectInputStream input,JComboBox combobox,JTextArea jtextarea)
    	{
    		this.socket=socket;
    		this.input=input;
    		this.combobox=combobox;
    		this.jtextarea=jtextarea;
    	}
    	public void run()
    	{
    		try
    		{
    			while(true)
    				{
    				    String st=(String)input.readObject();
                                    if(st.equalsIgnoreCase("list"))
                                    {
                                       String userlist=(String)input.readObject();
                                       String names[]=userlist.split("n");
                                       combobox.removeAllItems();
                                       int i=0;combobox.addItem("all");
                                       while(i<names.length)
                                       {
                                          combobox.addItem(names[i]);i++;
                                       }
                                       combobox.setSelectedIndex(0);
                                     }
                                     else if(st.equalsIgnoreCase("message"))
                                      {
                                        jtextarea.append((String)input.readObject());
                                       }
                                    
    				}
    		}catch(Exception e){}
    	}
    }
    public static void main(String args[])
    {
    	new ClientFrame(); 
    }
}

						