ICQ/即时通讯

开发平台：
Java

ServerFrame.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.*;
//=================主框架=================================
public class ServerFrame extends JFrame 
{
	
	private ServerSocket serverSocket;
	
	private UserList userlist;
	private ServerThread serverThread;
	Node n;
    public ServerFrame()
	{
		
		try
    	           {
    		    serverSocket=new ServerSocket(8000,10);
        		System.out.println("server start at 8000 port......n");
        		
        		
        		userlist=new UserList();
        		while(true){
			    n=new Node();
			    n.usersocket=serverSocket.accept();
			    userlist.add(n);
			    serverThread=new ServerThread(n.usersocket,userlist,n);
                        serverThread.start();
        		}
    	          }catch(Exception e){}	
		
		
	}//-----------------------ServerFrame（主框架）里的一些方法-------------------
   
    public class ServerThread extends Thread
    {
    	Socket usersocket;
    	UserList userlist;
    	boolean k;
        Node n;
    	public ServerThread(Socket usersocket,UserList userlist,Node n)
    	{
    		this.usersocket=usersocket;
    		this.n=n;
    		this.userlist=userlist;
    	}
    	public void run()
    	{
    		try
    		{
    			k=true;
    			n.output=new ObjectOutputStream(n.usersocket.getOutputStream());
    			n.output.flush();
    			n.input=new ObjectInputStream(n.usersocket.getInputStream());
    			n.username=(String)n.input.readObject();
    			System.out.println(n.username+"上线"+"n");
    			System.out.println("在线人数"+userlist.getCount()+"人");
    			String tosombody;
    			String message;
    			String msg;
    			while(this.k)
    			{
    				 
    				
        			 tosombody=(String)n.input.readObject();
    				 message=(String)n.input.readObject();
        			 msg=n.username+"对"+tosombody+"说:"+message+"n";
        			 if(tosombody.equalsIgnoreCase("closed"))
        			 {
        				 k=false;
        				 Node node=userlist.find(n.username);
        				 node.input.close();
        				 node.output.close();
        				 node.usersocket.close();
        				 System.out.println(n.username+"已下线");
        				 userlist.del(n);
        				 System.out.println("在线人数"+userlist.getCount()+"人");
        			 }
        			 else
        			 {
        				 
        				 if(tosombody.equalsIgnoreCase("all"))
             			         {
             				  int count=userlist.getCount();
             	    		          int i=0;
             	    		          while(i<count)
             	    		          {
             	    			    Node node=userlist.find(i);
             	    			    if(node!=null)
             	    			    {
             	    				try
                 	    			{
                 	    				node.output.writeObject("list");
                                                        node.output.flush();
                                                        int j=0;
                                                        String ss="";
                                                        while(j<count)
                                                        {
                                                          Node nn=userlist.find(j);
                                                          if(nn==null)
                                                          {
                                                             j++;continue;
                                                          } 
                                                           ss+=nn.username;
                                                           ss+="n";
                                                           j++;
                                                        }
                                                        node.output.writeObject(ss);
                                                        node.output.writeObject("message");
                                                        node.output.flush();
                                                        node.output.writeObject(msg);
                 	    				node.output.flush();
                 	    			}catch(Exception e){}
             	    				i++;
             	    			     }
             	    			
         				   }
         			
         			          }
             			          else
             			          {
             				      Node node=userlist.find(tosombody);
                  			       if(node!=null)
                  			       {
                  				  node.output.writeObject("list");
                                                  node.output.flush();
                                                  int j=0;
                                                  String ss=""; 
                                                  int count=userlist.getCount();
                                                  while(j<count)
                                                  {
                                                    Node nn=userlist.find(j);
                                                    if(nn==null)
                                                    {
                                                       j++;continue;
                                                    }  
                                                    ss+=nn.username;
                                                    ss+="n";
                                                    j++;
                                                  }
                                                  node.output.writeObject(ss);
                                                  node.output.writeObject("message");
                                                  node.output.flush();
                                                  node.output.writeObject(msg);
                  			      }
             			          }
        			 }
        			 
        			
    			}
    			
    		}catch(Exception e){}
    	}
        }
    public static void main(String args[])
    {
    	new ServerFrame();
    }
}
//-------------------方法结束--------------------------------
//====================主框架结束=========================================
//======================构造客户类，以及编写一些方法===================
class Node
{
	String username;
	Socket usersocket;
	ObjectOutputStream output;
	ObjectInputStream input;
	
	Node next=null;
}
class UserList
{
	Node root;
	Node pointer;
	int count;
	UserList()
	{
		root=new Node();
		root.next=null;
		pointer=null;
		count=0;
	}
    void add(Node n)
    {
    	pointer=root;
    	while(pointer.next!=null)
    	{
    		pointer=pointer.next;
    	}
    	pointer.next=n;
    	n.next=null;
    	count++;
    }
    void del(Node n)
    {
    	pointer=root;
    	while(pointer.next!=null)
    	{
    		if(pointer.next==n)
    		{
    			pointer.next=n.next;
    			count--;
    			break;
    		}
    		pointer=pointer.next;
    	}
    }
    int getCount()
    {
    	return count;
    }
    Node find(String username)
    {
    	if(count==0)return null;
    	pointer=root;
    	while(pointer.next!=null)
    	{
    		pointer=pointer.next;
    		if(pointer.username.equalsIgnoreCase(username))
    		{
    			return pointer;
    		}
    	}
    	return null;
    }
    Node find(int index)
    {
    	if(count==0)return null;
    	if(index<0)return null;
    	pointer=root;
    	int i=0;
    	while(i<index+1)
    	{
    		if(pointer.next!=null)
    		{
    			pointer=pointer.next;
    		}
    		else
    		{
    			return null;
    		}
    		i++;
    	}
    	return pointer;
    }
}//=====================客户类结束===============================

						