//==采用Java 5的ExecutorService來進行線程池的方式實現(xiàn)多線程,模擬客戶端多用戶向同一服務器端發(fā)送請求。//==服務器端：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;//線程池 private final int POOL_SIZE=10;//單個CPU線程池大小 public MultiThreadServer() throws IOException{ serverSocket=new ServerSocket(port); //Runtime的availableProcessor()方法返回當前系統(tǒng)的CPU數(shù)目. executorService=Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors()*POOL_SIZE); System.out.println("服務器啟動"); } public void service(){ while(true){ Socket socket=null; try { //接收客戶連接,只要客戶進行了連接,就會觸發(fā)accept();從而建立連接 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(); } } } } //==客戶端：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)); } } // 定義一個簡單的任務 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); // 發(fā)送關(guān)閉命令 OutputStream socketOut = socket.getOutputStream(); socketOut.write("shutdown/r/n".getBytes()); // 接收服務器的反饋 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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