多线程Java Socket编程示例

1.服务端

package sterning;    
   
import java.io.BufferedReader;    
import java.io.IOException;    
import java.io.InputStream;    
import java.io.InputStreamReader;    
import java.io.OutputStream;    
import java.io.PrintWriter;    
import java.net.*;    
import java.util.concurrent.*;    
   
public class MultiThreadServer {    
    private int port=8821;    
    private ServerSocket serverSocket;    
    private ExecutorService executorService;//线程池    
    private final int POOL_SIZE=10;//单个CPU线程池大小    
        
    public MultiThreadServer() throws IOException{    
        serverSocket=new ServerSocket(port);    
        //Runtime的availableProcessor()方法返回当前系统的CPU数目.    
        executorService=Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors()*POOL_SIZE);    
        System.out.println("服务器启动");    
    }    
        
    public void service(){    
        while(true){    
            Socket socket=null;    
            try {    
                //接收客户连接,只要客户进行了连接,就会触发accept();从而建立连接    
                socket=serverSocket.accept();    
                executorService.execute(new Handler(socket));    
                    
            } catch (Exception e) {    
                e.printStackTrace();    
            }    
        }    
    }    
        
    public static void main(String[] args) throws IOException {    
        new MultiThreadServer().service();    
    }    
   
}    
   
class Handler implements Runnable{    
    private Socket socket;    
    public Handler(Socket socket){    
        this.socket=socket;    
    }    
    private PrintWriter getWriter(Socket socket) throws IOException{    
        OutputStream socketOut=socket.getOutputStream();    
        return new PrintWriter(socketOut,true);    
    }    
    private BufferedReader getReader(Socket socket) throws IOException{    
        InputStream socketIn=socket.getInputStream();    
        return new BufferedReader(new InputStreamReader(socketIn));    
    }    
    public String echo(String msg){    
        return "echo:"+msg;    
    }    
    public void run(){    
        try {    
            System.out.println("New connection accepted "+socket.getInetAddress()+":"+socket.getPort());    
            BufferedReader br=getReader(socket);    
            PrintWriter pw=getWriter(socket);    
            String msg=null;    
            while((msg=br.readLine())!=null){    
                System.out.println(msg);    
                pw.println(echo(msg));    
                if(msg.equals("bye"))    
                    break;    
            }    
        } catch (IOException e) {    
            e.printStackTrace();    
        }finally{    
            try {    
                if(socket!=null)    
                    socket.close();    
            } catch (IOException e) {    
                e.printStackTrace();    
            }    
        }    
    }    
}   

2.客户端

package sterning;    
   
import java.io.BufferedReader;    
import java.io.IOException;    
import java.io.InputStreamReader;    
import java.io.OutputStream;    
import java.net.Socket;    
import java.util.concurrent.ExecutorService;    
import java.util.concurrent.Executors;    
   
public class MultiThreadClient {    
        
    public static void main(String[] args) {    
        int numTasks = 10;    
            
        ExecutorService exec = Executors.newCachedThreadPool();    
   
        for (int i = 0; i < numTasks; i++) {    
            exec.execute(createTask(i));    
        }    
   
    }    
   
    // 定义一个简单的任务    
    private static Runnable createTask(final int taskID) {    
        return new Runnable() {    
            private Socket socket = null;    
            private int port=8821;    
   
            public void run() {    
                System.out.println("Task " + taskID + ":start");    
                try {                        
                    socket = new Socket("localhost", port);    
                    // 发送关闭命令    
                    OutputStream socketOut = socket.getOutputStream();    
                    socketOut.write("shutdown\r\n".getBytes());    
   
                    // 接收服务器的反馈    
                    BufferedReader br = new BufferedReader(    
                            new InputStreamReader(socket.getInputStream()));    
                    String msg = null;    
                    while ((msg = br.readLine()) != null)    
                        System.out.println(msg);    
                } catch (IOException e) {                        
                    e.printStackTrace();    
                }    
            }    
   
        };    
    }    
}