用java实现一个简易web服务器

以下是一个简单的 Java Web 服务器的实现：

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

public class SimpleWebServer {
    public static void main(String[] args) throws Exception {
        ServerSocket serverSocket = new ServerSocket(8080);
        
        while (true) {
            Socket clientSocket = serverSocket.accept();
            BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
            OutputStream out = clientSocket.getOutputStream();
            
            String request = in.readLine();
            if (request.startsWith("GET /")) {
                String[] parts = request.split(" ");
                String filename = parts[1].substring(1);
                File file = new File(filename);
                if (file.exists()) {
                    out.write("HTTP/1.0 200 OK\r\n\r\n".getBytes());
                    FileInputStream fileIn = new FileInputStream(file);
                    byte[] buffer = new byte[4096];
                    int bytesRead;
                    while ((bytesRead = fileIn.read(buffer)) != -1) {
                        out.write(buffer, 0, bytesRead);
                    }
                } else {
                    out.write("HTTP/1.0 404 Not Found\r\n\r\n".getBytes());
                    out.write("<h1>404 Not Found</h1>".getBytes());
                }
            }
            
            out.close();
            in.close();
            clientSocket.close();
        }
    }
}

这个服务器监听 8080 端口，当有客户端连接时，会读取客户端发来的请求，并根据请求的文件名返回相应的文件内容。如果文件不存在，则返回 404 Not Found 错误。这是一个非常简单的实现，仅供参考。