Java Socket编程实例（三）

Java Socket编程实例（三）

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, 0, 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

2013-6-8 上午10:33:09

*/

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dtZYw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 invoke(Runnable task, T result, TimeUnit unit, long timeout) throws TimeoutException,

RuntimeException {

Future 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) {

thttp://hrow new RuntimeException(e);

}

return t;

}

public static T invoke(Callable task, TimeUnit unit, long timeout) throws TimeoutException, 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 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

dtZYw * 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 */

}

}

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