java c/s server

 /** * */import java.io.*;import java.net.*;/** * @author xinyu126 **/class Node{String username;Socket socket;ObjectOutputStream out;ObjectInputStream in;Node next;public Node(){username=null;socket=null;out=null;in=null;next=null;}}class Onlinelist{Node root;Node point;int count;public Onlinelist(){root=new Node();root.next=null;point=root;count=0;}public void add(Node node){point=root;while(point.next!=null)point=point.next;point.next=node;count++;System.out.println("online"+count);}public void del(Node node){point=root;while(point.next!=null){if(point.next==node){point.next=node.next;count--;break;}point=point.next;}System.out.println("online"+count);}public Node find(String username){point=root.next;while(point!=null){if(point.username.equals(username))return point;point=point.next;}return null;}public String showall(){String str="";point=root.next;while(point!=null){str=str+"|"+point.username;point=point.next;}return str;}} public class server {ServerSocket socket;serverlistenthread sth;Node client;Onlinelist online;public void init(){try{socket=new ServerSocket(5126);//System.out.println("端口(5126)打开成功");online=new Onlinelist();sth=new serverlistenthread(socket,online);sth.start();}catch(Exception err){//System.out.println("端口打开失败！");//System.out.println(err.getMessage());System.exit(1);}}public static void main(String args[]){server server=new server();server.init(); }}class serverlistenthread extends Thread{ServerSocket socket;Node client;Onlinelist online;serverclientthread clientthread;public serverlistenthread(ServerSocket socket,Onlinelist online){this.socket=socket;this.online=online;}public void sendmsgtoall(String msg){Node nodetemp=online.root.next;try{while(nodetemp!=null){nodetemp.out.write(0);nodetemp.out.flush();nodetemp.out.writeObject(msg);nodetemp.out.flush();nodetemp=nodetemp.next;}}catch(Exception e){System.out.println(e.toString());}}public void run(){while(!socket.isClosed()){client=new Node();try{//System.out.println("开始侦听");client.socket=socket.accept();//System.out.println("客户连接");client.out=new ObjectOutputStream(client.socket.getOutputStream());client.out.flush();client.in=new ObjectInputStream(client.socket.getInputStream());client.username=client.in.readObject().toString();online.add(client);sendmsgtoall(client.username+"上线了");sendmsgtoall("在线人数:"+online.count);sendmsgtoall(online.showall());clientthread=new serverclientthread(online,client);clientthread.start();}catch(Exception err){System.out.println(err.getMessage());}}}}class serverclientthread extends Thread{Node client,tempnode;Onlinelist online;int system;String touser;public serverclientthread(Onlinelist online,Node client){this.client=client;this.online=online;}public void run(){try{//开始侦听;while(!client.socket.isClosed()){system=client.in.read();System.out.println("system="+system);if(system==1){touser=client.in.readObject().toString();System.out.println("touser="+touser);tempnode=online.find(touser);System.out.println("temp="+tempnode);if(tempnode!=null){tempnode.out.write(1);tempnode.out.flush();tempnode.out.writeObject(touser);tempnode.out.flush();System.out.print("发送1");tempnode.out.writeObject(client.in.readObject());tempnode.out.flush();System.out.print("发送2");tempnode.out.writeObject(client.in.readObject());tempnode.out.flush();System.out.print("发送3");}else{client.out.write(0);client.out.flush();client.out.writeObject("系统消息:用户不在线");client.out.flush();client.in.readObject();client.in.readObject();}}else if(system==0){client.out.write(0);client.out.flush();client.out.writeObject("系统消息");client.out.flush();}else{System.out.print(client.in.readObject().toString());}//System.out.println("发送");//client.out.flush();}}catch(Exception err){System.out.println(err.toString());online.del(client);}}}