可以从HttpServlet获取HttpServletRequest对象吗？

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class MyServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
        // 获取请求信息
        String method = request.getMethod();
        String url = request.getRequestURL().toString();
        String queryString = request.getQueryString();
        
        // 处理请求
        
        // 返回响应
        response.getWriter().write("Hello, World!");
    }
}