线程池的简单Demo

服务器端：

public class Server {
    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();建立连接！
                socket=serverSocket.accept();
                executorService.execute(new ServerConThread(socket));
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }  

    public static void main(String[] args)throws IOException {
        new Server().service();
    }  

}  

线程：

public class ServerConThread implements Runnable{  

    private PrintWriter pw =null;
    private BufferedReader br=null;
    private Socket socket;
    public ServerConThread(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 void run(){
        try {
            System.out.println("新的连接： "+socket.getInetAddress()+":"+socket.getPort());
            br=getReader(socket);
            pw=getWriter(socket);
            String msg=null;
            while((msg=br.readLine())!=null){
                System.out.println("客户端说："msg);
                pw.println("我是服务器！");

            }
            br.close();
        } catch (IOException e) {
            e.printStackTrace();
            System.out.println("输入输出流异常！");
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            try {
                if(socket!=null)
                    socket.close();
            } catch (IOException e) {
                e.printStackTrace();
                System.out.println("输入输出流异常！);
            }
        }
    }
}

客户端：

public class Client {

    public static void main(String[] args) {
        int numTasks = 10;  

        ExecutorService exec = Executors.newCachedThreadPool();
        for(int i=0;i<10;i++){
            exec.execute(createTask(i));
        }
    }  

    // 定义了一个简单的任务
    private static Runnable createTask(final int taskID) {
        return new Runnable() {
            private Socket socket =null;
            private int port=6666;

            public void run() {
                System.out.println("任务 " + taskID +":开始");
                try {
                    socket = new Socket("localhost", port);
                    OutputStream socketOut = socket.getOutputStream();

                    PrintWriter pw = new PrintWriter(socketOut);
                    pw.println("我是客户端！");

                    pw.flush();
                    // 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();
                }
            }  

        };
    }
}

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