通过ServletContext实现对servlet的请求转发

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