Java socket多线程

1、Server

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;// 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();从而建立连接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();}}}}

2、client

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));}}// 定义一个简单的任务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);// 发送关闭命令OutputStream socketOut = socket.getOutputStream();socketOut.write("shutdown\r\n".getBytes());// 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();}}};}}