基于Java Socket的网络服务端小程序

关键词：socket ServerSocket 多线程 服务端 

主程序监听一端口，等待客户接入；同时构造一个线程类，准备接管会话。当一个Socket会话产生后，将这个会话交给线程处理，然后主程序继续监听。运用Thread类或Runnable接口来实现是不错的办法。

 

Java源代码：

import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.ServerSocket;import java.net.Socket;public class Server extends ServerSocket {private static final int SERVER_PORT = 8888;public Server() throws IOException {super(SERVER_PORT);System.out.println("服务开始...");try {while (true) {Socket socket = accept();new CreateServerThread(socket);}} catch (IOException e) {} finally {close();}}// --- CreateServerThreadclass CreateServerThread extends Thread {private Socket client;private BufferedReader in;private PrintWriter out;public CreateServerThread(Socket s) throws IOException {client = s;in = new BufferedReader(new InputStreamReader(client.getInputStream(), "GB2312"));out = new PrintWriter(client.getOutputStream(), true);out.println("--- Welcome ---");start();}public void run() {try {String line = in.readLine();while (!line.equals("bye")) {String msg = createMessage(line);out.println(msg);line = in.readLine();}out.println("--- See you, bye! ---");client.close();} catch (IOException e) {}}private String createMessage(String line){return "服务器响应 :"+line;}}public static void main(String[] args) throws IOException {new Server();}}

这个程序监听8888端口，并将接入交给CreateServerThread线程运行。CreateServerThread线程接受输入，并将输入回应客户，直到客户输入"bye"，线程结束。我们可以在createMessage方法中，对输入进行处理，并产生结果，然后把结果返回给客户。