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(shù)據(jù)Request共享數(shù)據(jù)

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

后臺輸出：

從后臺輸出看出，requestDemo5請求進來了，從瀏覽器看出，轉發(fā)失敗了，而且從實際轉發(fā)的路徑上看，因為虛擬路徑，所以請求轉發(fā)只能轉發(fā)到當前服務器內部的資源

請求轉發(fā)的特點總結：（與之對應的------重定向的詳情與特點）

瀏覽器地址欄路徑不發(fā)生變化 轉發(fā)只是一次請求，可共享數(shù)據(jù)Request共享數(shù)據(jù) 哪種請求方式只能轉發(fā)到那種請求方式 請求轉發(fā)只能轉發(fā)到當前服務器內部的資源

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