Java Socket编程实例（三）- TCP服务端线程池

一、服务端回传服务类：

import java.io.IOException; 
import java.io.InputStream; 
import java.io.OutputStream; 
import java.net.Socket; 
import java.util.logging.Level; 
import java.util.logging.Logger; 
 
public class EchoProtocol implements Runnable { 
  private static final int BUFSIZE = 32; // Size (in bytes) of I/O buffer 
  private Socket clientSocket; // Socket connect to client 
  private Logger logger; // Server logger 
 
  public EchoProtocol(Socket clientSocket,Logger logger) { 
    this.clientSocket = clientSocket; 
    this.logger = logger; 
  } 
 
  public static void handleEchoClient(Socket clientSocket,Logger logger) { 
    try { 
      // Get the input and output I/O streams from socket 
      InputStream in = clientSocket.getInputStream(); 
      OutputStream out = clientSocket.getOutputStream(); 
 
      int recvMsgSize; // Size of received message 
      int totalBytesEchoed = 0; // Bytes received from client 
      byte[] echoBuffer = new byte[BUFSIZE]; // Receive Buffer 
      // Receive until client closes connection,indicated by -1 
      while ((recvMsgSize = in.read(echoBuffer)) != -1) { 
        out.write(echoBuffer,recvMsgSize); 
        totalBytesEchoed += recvMsgSize; 
      } 
 
      logger.info("Client " + clientSocket.getRemoteSocketAddress() + ",echoed " + totalBytesEchoed + " bytes."); 
       
    } catch (IOException ex) { 
      logger.log(Level.WARNING,"Exception in echo protocol",ex); 
    } finally { 
      try { 
        clientSocket.close(); 
      } catch (IOException e) { 
      } 
    } 
  } 
 
  public void run() { 
    handleEchoClient(this.clientSocket,this.logger); 
  } 
} 

二、每个客户端请求都新启一个线程的Tcp服务端：

import java.io.IOException; 
import java.net.ServerSocket; 
import java.net.Socket; 
import java.util.logging.Logger; 
 
public class TCPEchoServerThread { 
 
  public static void main(String[] args) throws IOException { 
    // Create a server socket to accept client connection requests 
    ServerSocket servSock = new ServerSocket(5500); 
 
    Logger logger = Logger.getLogger("practical"); 
 
    // Run forever,accepting and spawning a thread for each connection 
    while (true) { 
      Socket clntSock = servSock.accept(); // Block waiting for connection 
      // Spawn thread to handle new connection 
      Thread thread = new Thread(new EchoProtocol(clntSock,logger)); 
      thread.start(); 
      logger.info("Created and started Thread " + thread.getName()); 
    } 
    /* NOT REACHED */ 
  } 
} 

三、固定线程数的Tcp服务端：

import java.io.IOException; 
import java.net.ServerSocket; 
import java.net.Socket; 
import java.util.logging.Level; 
import java.util.logging.Logger; 
 
public class TCPEchoServerPool { 
  public static void main(String[] args) throws IOException { 
    int threadPoolSize = 3; // Fixed ThreadPoolSize 
 
    final ServerSocket servSock = new ServerSocket(5500); 
    final Logger logger = Logger.getLogger("practical"); 
 
    // Spawn a fixed number of threads to service clients 
    for (int i = 0; i < threadPoolSize; i++) { 
      Thread thread = new Thread() { 
        public void run() { 
          while (true) { 
            try { 
              Socket clntSock = servSock.accept(); // Wait for a connection 
              EchoProtocol.handleEchoClient(clntSock,logger); // Handle it 
            } catch (IOException ex) { 
              logger.log(Level.WARNING,"Client accept failed",ex); 
            } 
          } 
        } 
      }; 
      thread.start(); 
      logger.info("Created and started Thread = " + thread.getName()); 
    } 
  } 
} 

四、使用线程池(使用Spring的线程次会有队列、最大线程数、最小线程数和超时时间的概念)

1.线程池工具类：

import java.util.concurrent.*; 
 
/** 
 * 任务执行者 
 * 
 * @author Watson Xu 
 * @since 1.0.0 <p>2013-6-8 上午10:33:09</p> 
 */ 
public class ThreadPoolTaskExecutor { 
 
  private ThreadPoolTaskExecutor() { 
 
  } 
 
  private static ExecutorService executor = Executors.newCachedThreadPool(new ThreadFactory() { 
    int count; 
 
    /* 执行器会在需要自行任务而线程池中没有线程的时候来调用该程序。对于callable类型的调用通过封装以后转化为runnable */ 
    public Thread newThread(Runnable r) { 
      count++; 
      Thread invokeThread = new Thread(r); 
      invokeThread.setName("Courser Thread-" + count); 
      invokeThread.setDaemon(false);// //???????????? 
 
      return invokeThread; 
    } 
  }); 
 
  public static void invoke(Runnable task,TimeUnit unit,long timeout) throws TimeoutException,RuntimeException { 
    invoke(task,null,unit,timeout); 
  } 
 
  public static <T> T invoke(Runnable task,T result,RuntimeException { 
    Future<T> future = executor.submit(task,result); 
    T t = null; 
    try { 
      t = future.get(timeout,unit); 
    } catch (TimeoutException e) { 
      throw new TimeoutException("Thread invoke timeout ..."); 
    } catch (Exception e) { 
      throw new RuntimeException(e); 
    } 
    return t; 
  } 
 
  public static <T> T invoke(Callable<T> task,RuntimeException { 
    // 这里将任务提交给执行器，任务已经启动，这里是异步的。 
    Future<T> future = executor.submit(task); 
    // System.out.println("Task aready in thread"); 
    T t = null; 
    try { 
      /* 
       * 这里的操作是确认任务是否已经完成，有了这个操作以后 
       * 1)对invoke()的调用线程变成了等待任务完成状态 
       * 2)主线程可以接收子线程的处理结果 
       */ 
      t = future.get(timeout,unit); 
    } catch (TimeoutException e) { 
      throw new TimeoutException("Thread invoke timeout ..."); 
    } catch (Exception e) { 
      throw new RuntimeException(e); 
    } 
 
    return t; 
  } 
} 

2.具有伸缩性的Tcp服务端：

import java.io.IOException; 
import java.net.ServerSocket; 
import java.net.Socket; 
import java.util.concurrent.TimeUnit; 
import java.util.logging.Logger; 
 
import demo.callable.ThreadPoolTaskExecutor; 
 
 
public class TCPEchoServerExecutor { 
 
  public static void main(String[] args) throws IOException { 
    // Create a server socket to accept client connection requests 
    ServerSocket servSock = new ServerSocket(5500); 
 
    Logger logger = Logger.getLogger("practical"); 
     
    // Run forever,accepting and spawning threads to service each connection 
    while (true) { 
      Socket clntSock = servSock.accept(); // Block waiting for connection 
      //executorService.submit(new EchoProtocol(clntSock,logger)); 
      try { 
        ThreadPoolTaskExecutor.invoke(new EchoProtocol(clntSock,logger),TimeUnit.SECONDS,3); 
      } catch (Exception e) { 
      }  
      //service.execute(new TimelimitEchoProtocol(clntSock,logger)); 
    } 
    /* NOT REACHED */ 
  } 
} 

以上就是本文的全部内容，查看更多Java的语法，大家可以关注：《Thinking in Java 中文手册》、《JDK 1.7 参考手册官方英文版》、《JDK 1.6 API java 中文参考手册》、《JDK 1.5 API java 中文参考手册》，也希望大家多多支持编程小技巧。

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