Java简单的web服务器多线程，代码实例

Java的简单Web服务器使用多线程可以更好地处理并发请求。这里是一个基于Socket编程的简单示例，使用了`java.net.ServerSocket`和`java.lang.Thread`：

import java.io.*;
import java.net.*;

public class SimpleWebServer {
    private ServerSocket serverSocket;

    public static void main(String[] args) throws IOException {
        new SimpleWebServer().start();
    }

    public void start() throws IOException {
        serverSocket = new ServerSocket(8080); // 设置监听端口
        System.out.println("Server started on port " + serverSocket.getLocalPort());

        while (true) { // 无限循环接收新连接
            Socket clientSocket = serverSocket.accept(); // 接收客户端连接
            Thread handlerThread = new ClientHandler(clientSocket);
            handlerThread.start(); // 创建新线程处理请求
        }
    }

    private class ClientHandler extends Thread {
        private Socket clientSocket;

        public ClientHandler(Socket socket) {
            this.clientSocket = socket;
        }

        @Override
        public void run() {
            try {
                BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
                PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);

                String requestLine = in.readLine();
                if (requestLine.startsWith("GET")) {
                    handleGetRequest(requestLine, out);
                } else {
                    out.println("HTTP/1.1 405 Method Not Allowed");
                    out.flush();
                }

                in.close();
                out.close();
                clientSocket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        private void handleGetRequest(String requestLine, PrintWriter out) throws IOException {
            // 这里仅做基本响应，实际应用需要解析路径并返回相应内容
            out.println("HTTP/1.1 200 OK");
            out.println("Content-Type: text/plain");
            out.println();
            out.println("Hello from simple web server!");
            out.flush();
        }
    }
}

这个例子创建了一个监听指定端口的服务器，当有新的TCP连接到来时，会创建一个新的线程去处理每个客户端的请求。