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Java 5.0 多线程编程实践

新客网 XKER.COM 2008-04-24 来源:ibm 张黄瞩 收藏本文

  服务器端的完整实现

  服务器端的完整实现代码如下:

package com.andrew;

import java.io.DataOutputStream;
import java.io.IOException;
import java.io.Serializable;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.RejectedExecutionHandler;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.ReentrantLock;

public class Server {
 private static int produceTaskSleepTime = 100;
 private static int consumeTaskSleepTime = 1200;
 private static int produceTaskMaxNumber = 100;
 private static final int CORE_POOL_SIZE = 2;
 private static final int MAX_POOL_SIZE = 100;
 private static final int KEEPALIVE_TIME = 3;
 private static final int QUEUE_CAPACITY = (CORE_POOL_SIZE + MAX_POOL_SIZE) / 2;
 private static final TimeUnit TIME_UNIT = TimeUnit.SECONDS;
 private static final String HOST = "127.0.0.1";
 private static final int PORT = 19527;
 private BlockingQueue<Runnable> workQueue = new ArrayBlockingQueue<Runnable>(QUEUE_CAPACITY);
 //private ThreadPoolExecutor serverThreadPool = null;
 private ExecutorService pool = null;
 private RejectedExecutionHandler rejectedExecutionHandler = new ThreadPoolExecutor.DiscardOldestPolicy();
 private ServerSocket serverListenSocket = null;
 private int times = 5;
 public void start() {
  // You can also init thread pool in this way.
  /*serverThreadPool = new ThreadPoolExecutor(CORE_POOL_SIZE,
  MAX_POOL_SIZE, KEEPALIVE_TIME, TIME_UNIT, workQueue,
  rejectedExecutionHandler);*/
  pool = Executors.newFixedThreadPool(10);
  try {
   serverListenSocket = new ServerSocket(PORT);
   serverListenSocket.setReuseAddress(true);

   System.out.println("I'm listening");
   while (times-- > 0) {
    Socket socket = serverListenSocket.accept();
    String welcomeString = "hello";
    //serverThreadPool.execute(new ServiceThread(socket, welcomeString));
    pool.execute(new ServiceThread(socket));
   }
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  cleanup();
 }

 public void cleanup() {
  if (null != serverListenSocket) {
   try {
    serverListenSocket.close();
   } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
  }
  //serverThreadPool.shutdown();
  pool.shutdown();
 }

 public static void main(String args[]) {
  Server server = new Server();
  server.start();
 }
}

class ServiceThread implements Runnable, Serializable {
 private static final long serialVersionUID = 0;
 private Socket connectedSocket = null;
 private String helloString = null;
 private static int count = 0;
 private static ReentrantLock lock = new ReentrantLock();

 ServiceThread(Socket socket) {
  connectedSocket = socket;
 }

 public void run() {
  increaseCount();
  int curCount = getCount();
  helloString = "hello, id = " + curCount + "\r\n";

  ExecutorService executor = Executors.newSingleThreadExecutor();
  Future<String> future = executor.submit(new TimeConsumingTask());

  DataOutputStream dos = null;
  try {
   dos = new DataOutputStream(connectedSocket.getOutputStream());
   dos.write(helloString.getBytes());
   try {
    dos.write("let's do soemthing other.\r\n".getBytes());
    String result = future.get();
    dos.write(result.getBytes());
   } catch (InterruptedException e) {
    e.printStackTrace();
   } catch (ExecutionException e) {
    e.printStackTrace();
   }
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } finally {
   if (null != connectedSocket) {
    try {
     connectedSocket.close();
    } catch (IOException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
   }
   if (null != dos) {
    try {
     dos.close();
    } catch (IOException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
   }
   executor.shutdown();
  }
 }

 private int getCount() {
  int ret = 0;
  try {
   lock.lock();
   ret = count;
  } finally {
   lock.unlock();
  }
  return ret;
 }

 private void increaseCount() {
  try {
   lock.lock();
   ++count;
  } finally {
   lock.unlock();
  }
 }
}

class TimeConsumingTask implements Callable<String> {
 public String call() throws Exception {
  System.out.println("It's a time-consuming task, you'd better retrieve your result in the furture");
  return "ok, here's the result: It takes me lots of time to produce this result";
 }

}

  运行程序

  运行服务端,客户端只需使用telnet 127.0.0.1 19527 即可看到信息如下:

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标签:多线程   Java5.0  
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