Java中Request請求轉發(fā)詳解

更新時間：2020年07月12日 14:20:40 作者：持續(xù)更新，2天一篇

這篇文章主要介紹了Java中Request請求轉發(fā)詳解，文中通過示例代碼介紹的非常詳細，對大家的學習或者工作具有一定的參考學習價值，需要的朋友們下面隨著小編來一起學習學習吧

直接來，RequestDemo5代碼，get請求和post請求都請求轉發(fā)了，轉發(fā)到RequestDemo6請求

RequestDemo5代碼

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 林高祿
 * @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進來了......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進來了......get");
 RequestDispatcher requestDispatcher = request.getRequestDispatcher("/requestDemo6");
 requestDispatcher.forward(request,response);
 
 }
}

RequestDemo6代碼

package com.lingaolu.request;
 
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.*;
import java.io.IOException;
 
/**
 * @author 林高祿
 * @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進來了......post");
 }
 
 @Override
 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 System.out.println("requestDemo6進來了......get");
 }
}

瀏覽器訪問/requestDemo5接口

控制臺輸出

從以上結果可以看出

請求過后我們的瀏覽器地址還是http://localhost:8080/myRequest/requestDemo5

從瀏覽器的F12調試頁面可以看出，轉發(fā)只是一次請求，只有/requestDemo5請求，說明，可共享數據Request共享數據

我們用Postman進行post請求一下

后臺輸出：

可見，get請求的轉發(fā)會轉發(fā)到get請求，post請求的轉發(fā)，會轉發(fā)到post請求

我們改一下RequestDemo5的代碼，轉發(fā)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 林高祿
 * @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進來了......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進來了......get");
 RequestDispatcher requestDispatcher = request.getRequestDispatcher("https://www.baidu.com/");
 requestDispatcher.forward(request,response);
 
 }
}

瀏覽器請求