zoukankan      html  css  js  c++  java
  • 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

     

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  • 原文地址:https://www.cnblogs.com/longlyseul/p/9948302.html
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