通过ServletContext实现对servlet的请求转发

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通过ServletContext 实现客户端对一个servlet 的请求转发到另一个servlet：

ServletContextDemo2.java文件：

package com.neu;//转发源import java.io.IOException;import javax.servlet.RequestDispatcher;import javax.servlet.ServletContext;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class ServletContextDemo2 extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {ServletContext sc = getServletContext();RequestDispatcher rd = sc.getRequestDispatcher("/servlet/ServletContextDemo3");//转发的地址。ServletContext得到的,地址必须以"/"开头，该"/"代表着当前应用的访问路径。rd.forward(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {}}

ServletContextDemo3.java文件：

package com.neu;//转发的目标import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class ServletContextDemo3 extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.getWriter().write("I am three");}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {}}

运行结果：

运行：http://localhost:8080/ServletDemo/servlet/ServletContextDemo2
结果：I am three

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