11.2 路径问题

虚拟目录（项目路径访问）：加上了模块名：/request-demo/resp2 — 其中的/request-demo是模块名，就是虚拟目录，用于浏览器使用
URL名：去掉模块名： /resp2

package com.itheima.web.reponse;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;
@WebServlet("/resp1")
public class ResponseDemo1 extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        System.out.println("resp1...");
        // 将resp1  重定向到resp2
        // 1. 设置响应状态码  302
//        response.setStatus(302); // 302 从重定向状态码
//        // 2. 设置响应头 Location   第二个参数为虚拟目录（模块名 + resp的目录）
//        response.setHeader("Location","/request-demo/resp2");
        // 简化方式完成重定向
        //动态获取虚拟目录
        String contextPath = request.getContextPath();
        // 简化方式完成重定向
        response.sendRedirect(contextPath + "/resp2"); // 这是一个明确路径，
        // 也可以重定向到百度
//        response.sendRedirect("https://www.baidu.com");
    }
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doGet(request, response);
    }
}

package com.itheima.web.reponse;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@WebServlet("/resp2")
public class ResponseDemo2 extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        System.out.println("resp2...");
    }
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doGet(request, response);
    }
}