javaweb学习（day07-手动实现tomcat)

在这个例子中，我们将手动实现一个简单的HTTP服务器，用于处理静态文件和简单的servlet处理。

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.HashMap;
import java.util.Map;
 
public class SimpleWebServer {
    private int port;
    private String webAppRoot;
    private Map<String, HttpServlet> servlets = new HashMap<>();
 
    public SimpleWebServer(int port, String webAppRoot) {
        this.port = port;
        this.webAppRoot = webAppRoot;
    }
 
    public void addServlet(String path, HttpServlet servlet) {
        servlets.put(path, servlet);
    }
 
    public void start() throws IOException {
        ServerSocket serverSocket = new ServerSocket(port);
        System.out.println("Server started on port " + port);
 
        while (true) {
            Socket clientSocket = serverSocket.accept();
            handleRequest(clientSocket);
        }
    }
 
    private void handleRequest(Socket clientSocket) throws IOException {
        InputStream inputStream = clientSocket.getInputStream();
        OutputStream outputStream = clientSocket.getOutputStream();
 
        // 读取请求信息
        Request request = new Request(inputStream);
        System.out.println("Request URI: " + request.getUri());
 
        // 根据URI路径处理请求
        if (servlets.containsKey(request.getUri())) {
            HttpServlet servlet = servlets.get(request.getUri());
            servlet.service(request, new Response(outputStream));
        } else {
            String filePath = webAppRoot + request.getUri();
            File file = new File(filePath);
            if (file.exists()) {
                FilesUtil.copy(file, outputStream);
            } else {
                String errorMessage = "HTTP/1.1 404 File Not Found\r\nContent-Type: text/html\r\n\r\n";
                outputStream.write(errorMessage.getBytes());
            }
        }
 
        outputStream.close();
        inputStream.close();
        clientSocket.close();
    }
 
    public static void main(String[] args) throws IOException {
        SimpleWebServer server = new SimpleWebServer(8080, "webapp");
        server.addServlet("/hello", new HelloServlet());
        server.start();
    }
}
 
class Request {
    private String uri;
 
    pub