?? ??? ?2. 請求轉(zhuǎn)發(fā)：一種在服務(wù)器內(nèi)部的資源跳轉(zhuǎn)方式
?? ??? ??? ?1. 步驟：
?? ??? ??? ??? ?1. 通過request對象獲取請求轉(zhuǎn)發(fā)器對象：RequestDispatcher getRequestDispatcher(String path)
?? ??? ??? ??? ?2. 使用RequestDispatcher對象來進(jìn)行轉(zhuǎn)發(fā)：forward(ServletRequest request, ServletResponse response)?

?? ??? ??? ?2. 特點(diǎn)：
?? ??? ??? ??? ?1. 瀏覽器地址欄路徑不發(fā)生變化
?? ??? ??? ??? ?2. 只能轉(zhuǎn)發(fā)到當(dāng)前服務(wù)器內(nèi)部資源中。
?? ??? ??? ??? ?3. 轉(zhuǎn)發(fā)是一次請求

package com.learn.web.request;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("/requestDemo8") public class RequestDemo8 extends HttpServlet {protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {System.out.println("demo8888被訪問了。。。");//轉(zhuǎn)發(fā)到demo9資源 /*RequestDispatcher requestDispatcher = request.getRequestDispatcher("/requestDemo9");requestDispatcher.forward(request,response);*///存儲數(shù)據(jù)到request域中request.setAttribute("msg","hello");request.getRequestDispatcher("/requestDemo9").forward(request,response); // request.getRequestDispatcher("http://www.baidu.com").forward(request,response);}protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doPost(request,response);} } package com.learn.web.request;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("/requestDemo9") public class RequestDemo9 extends HttpServlet {protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {//獲取數(shù)據(jù)Object msg = request.getAttribute("msg");System.out.println(msg);System.out.println("demo9999被訪問了。。。");}protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doPost(request,response);} }

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