Java中Request请求转发详解

Java中Request请求转发详解直接来，RequestDemo5代码，get请求和post请求都请求转发了，转发到RequestDemo6请求
RequestDemo5代码
package com.lingaolu.request;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.*;
import java.io.IOException;
/**
* @author 林⾼禄
* @create 2020-07-07-12:06
*/
@WebServlet("/requestDemo5")
public class RequestDemo5 extends HttpServlet {
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("requestDemo5进来了......post");
RequestDispatcher requestDispatcher = request.getRequestDispatcher("/requestDemo6");
requestDispatcher.forward(request,response);
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("requestDemo5进来了......get");
RequestDispatcher requestDispatcher = request.getRequestDispatcher("/requestDemo6");
requestDispatcher.forward(request,response);
}
}
RequestDemo6代码
package com.lingaolu.request;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.*;
import java.io.IOException;
/**
* @author 林⾼禄
* @create 2020-07-07-12:06
*/
@WebServlet("/requestDemo6")
public class RequestDemo6 extends HttpServlet {
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("requestDemo6进来了......post");
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("requestDemo6进来了......get");
}
}
浏览器访问/requestDemo5接⼝
控制台输出
从以上结果可以看出
从浏览器的F12调试页⾯可以看出，转发只是⼀次请求，只有/requestDemo5请求，说明，可共享数据我们⽤Postman进⾏post请求⼀下
可见，get请求的转发会转发到get请求，post请求的转发，会转发到post请求
我们改⼀下RequestDemo5的代码，转发到百度
package com.lingaolu.request;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.*;
import java.io.IOException;
/**
* @author 林⾼禄
* @create 2020-07-07-12:06
*/
@WebServlet("/requestDemo5")
public class RequestDemo5 extends HttpServlet {
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("requestDemo5进来了......post");
RequestDispatcher requestDispatcher = request.getRequestDispatcher("/requestDemo6");
requestDispatcher.forward(request,response);
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("requestDemo5进来了......get");
RequestDispatcher requestDispatcher = request.getRequestDispatcher("https:///");
requestDispatcher.forward(request,response);
}
}
浏览器请求
从后台输出看出，requestDemo5请求进来了，从浏览器看出，转发失败了，⽽且从实际转发的路径上看，因为虚拟路径，所以请求转发只能转发到当前服务器内部的资源
请求转发的特点总结：（与之对应的------）
浏览器地址栏路径不发⽣变化
转发只是⼀次请求，可共享数据Request共享数据
哪种请求⽅式只能转发到那种请求⽅式
请求转发只能转发到当前服务器内部的资源
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