Servlet转发
可以使用ServletContext中的getRequestDispatcher(url).forward(request, response)方法进行转发
myservlet2.java
public class myservlet2 extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("我要办事"); System.out.println("你的事我办不了"); System.out.println("你的事我找人帮你办"); ServletContext application=this.getServletContext(); //将请求向下传递 application.getRequestDispatcher("/demo3").forward(request, response); System.out.println("事办完了"); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request,response); } }
myservlet3.java
public class myservlet3 extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("这个事我能办"); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request,response); } }
web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <display-name></display-name> <servlet> <description>This is the description of my J2EE component</description> <display-name>This is the display name of my J2EE component</display-name> <servlet-name>myservlet2</servlet-name> <servlet-class>com.zk.myservlet.myservlet2</servlet-class> </servlet> <servlet> <description>This is the description of my J2EE component</description> <display-name>This is the display name of my J2EE component</display-name> <servlet-name>myservlet3</servlet-name> <servlet-class>com.zk.myservlet.myservlet3</servlet-class> </servlet> <servlet-mapping> <servlet-name>myservlet2</servlet-name> <url-pattern>/demo2</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>myservlet3</servlet-name> <url-pattern>/demo3</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>
运行效果:此案例从myservlet2.java中间转发至myservlet3.java
程序结构