Java Socket 网络编程之信息转发

中国IT实验室收集整理

longlong…

2008-5-30

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本程序实现功能如下:

1.限制连接的客户数;

2.客户端发送数据给服务器,服务器负责将收到的信息转发到其他客户端.

//DateServer.java文件

import java.net.*;
import java.util.Date;
import java.util.*;
import java.io.*;

class Operator extends Thread {
    DateServer server;
    Socket sr;
    OutputStream out;
    PrintStream ps;
    List<Socket> clients;
    public Operator(DateServer _server,Socket s,List<Socket> clients ) {
        this.clients=clients;
        server = _server;
        this.sr = s;
    }
    public Operator() {

    }
    public void run() {
        try {
            InputStream in = sr.getInputStream();
            BufferedReader bin = new BufferedReader(new InputStreamReader(in));
            String data = bin.readLine();
            while (data != null) {
                //将接收的信息转发出去
                //打印接收的信息
                System.out.println(data);
                //继续读取接收
                for(int j=0; j<clients.size(); j++)//服务器将它转发其他所有的客户端
                {
                    Socket c1 = clients.get(j);
                     out = c1.getOutputStream();
                      ps = new PrintStream(out,true);
                      if(!c1.equals(sr))ps.println(">>"+clients.size()+ ":"+ data);
                    System.out.println("From Client: "+" " + data);
                }
                data = bin.readLine();
            }//end of while

            bin.close();
            ps.close();
            sr.close();
            } catch (Exception e) {
            e.printStackTrace();
        } finally {
            server.delCount();
        }
    }//end of run
}// end of class Operator

public class DateServer {
    ServerSocket ss;

    final int MAX_COUNT = 10;
    int connectCount = 0;
    List <Socket> clients = new ArrayList<Socket>();
    public synchronized void addCount() {
        connectCount++;
        System.out.println("After addCount, connectCount=" + connectCount);
    }

    public synchronized void delCount() {
        connectCount--;
        System.out.println("After delCount, connectCount=" + connectCount);
    }

    public synchronized boolean isCountExceed() {
        if (connectCount > MAX_COUNT)
            return true;
        else
            return false;
    }

    public static void main(String args[]) {
        new DateServer().go();
    }

    public void go() {
        // Register your service on port 5678
        try {
            ss = new ServerSocket(5678);
        } catch (IOException e) {        }

        // Run the listen/accept loop forever
        while (true) {
            try {
                while (isCountExceed()) {
                    try {
                        Thread.sleep(5000);
                    } catch (Exception e) {
                    }
                }

                // Wait here and listen for a connection
                Socket s= ss.accept();
                clients.add(s);
                System.out.println("accept one client");
                addCount();
                Operator ms = new Operator(this,s,clients);
                ms.start();
            } catch (Exception e) {
                e.printStackTrace();
            }
        } //end of while loop
    } //end of method go()
} //end of class DateServer

//DateClient.java文件

import java.net.*;
import java.util.Date;
import java.io.*;
public class DateClient extends Thread{
    //PrintStream OutputS;
    Socket s1;
   public static void main(String args[]){
       PrintStream ps1;
       DataInputStream KeyInput = new DataInputStream(System.in);
    String sdata;
     DateClient dc = new DateClient();
     try {
        dc.s1 = new Socket("127.0.0.1",5678);
    } catch (UnknownHostException e1) {

        e1.printStackTrace();
    } catch (IOException e1) {

        e1.printStackTrace();
    }
     dc.setName(args[0]);
     dc.start();
     while(true)
     {
     try {

     OutputStream out1 = dc.s1.getOutputStream();
     ps1 = new PrintStream(out1,true);
     sdata= KeyInput.readLine(); //以行形式读入
     System.out.println(""+sdata);
        ps1.println(args[0]+ ":"+sdata);
     }
catch (IOException e){
    return;

}
     }

   }

   public void run() {
        OutputStream out;
        PrintStream ps;
        try{
            out = s1.getOutputStream();
            ps = new PrintStream(out,true);
            ps.println(getName()+ ":"+ new Date().toString()+" Connected");
            System.out.println("send:"+getName()+ ":"+ new Date().toString());
          //接收服务器转发来的消息
            InputStream in = s1.getInputStream();
            BufferedReader bin = new BufferedReader(new InputStreamReader(in));
            String data = bin.readLine();

while(data != null){
    System.out.println(data);
                 data = bin.readLine();
            }

        }catch(Exception e){
            e.printStackTrace();
        }
    } //end of method go()
} //end of class DateClient()