分类

Request 原理

servlet实实现类：

@WebServlet("/request")
public class Request01 extends HttpServlet {
 
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, 
        }
}

访问路径

·注：虚拟路径设置为‘/’

http://localhost:8080/request

1. tomcat 服务器会通过请求路径中的资源路径‘/request’,创建对应的Request01的对象。
2. tomcat 服务器会创建request 和 response对象，
3. request 里封装请求的数据和信息
4. response 里封装响应消息
5. tomcat 将request 和 response 通过service方法传给service并调用service方法

请求转发

1. 创建使用转发资源
2. 创建被转发资源
3. 运行查看结果

使用转发资源

package com.forwordRequest;

import javax.servlet.RequestDispatcher;
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("/forword01")
public class Forword01 extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        System.out.println("Forword01+post");
        this.doGet(request,response);
    }
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        System.out.println("Forword01+get");
        request.getRequestDispatcher("/forword02").forward(request,response);
    }
}

被转发资源

package com.forwordRequest;

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( "/forword02")
public class Forword02 extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        System.out.println("Forword02被转发+post");
        this.doGet(request,response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        System.out.println("Forword02被转发+get");
    }
}

运行结果

访问路径：

http://localhost:8080/forword01

运行结果：

Forword01+get
Forword02被转发+get

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