package com.jsn.web.servlet;

 

 1 package com.jsn.web.servlet;
 2 
 3 import java.io.IOException;
 4 
 5 import javax.servlet.Servlet;
 6 import javax.servlet.ServletConfig;
 7 import javax.servlet.ServletException;
 8 import javax.servlet.ServletRequest;
 9 import javax.servlet.ServletResponse;
10 
11 public class HelloServlet implements Servlet {
12 
13     @Override
14     public void destroy() {
15         // TODO Auto-generated method stub
16         System.out.println("hello");
17     }
18 
19     @Override
20     public ServletConfig getServletConfig() {
21         // TODO Auto-generated method stub
22         return null;
23     }
24 
25     @Override
26     public String getServletInfo() {
27         // TODO Auto-generated method stub
28         return null;
29     }
30 
31     @Override
32     public void init(ServletConfig arg0) throws ServletException {
33         // TODO Auto-generated method stub
34         System.out.println("hello init");
35     }
36 
37     @Override
38     public void service(ServletRequest arg0, ServletResponse response) throws ServletException, IOException {
39         // TODO Auto-generated method stub
40         response.getWriter().write("hello service response");
41     }
42 
43 }

 

 

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
 3   <display-name>dyweb</display-name>
 4   
 5   <servlet>
 6   <servlet-name>HelloServlet</servlet-name>
 7   <servlet-class>com.jsn.web.servlet.HelloServlet</servlet-class>
 8   
 9   
10   
11   </servlet>
12   <servlet-mapping>
13   <servlet-name>HelloServlet</servlet-name>
14   <url-pattern>/hellworld</url-pattern>
15   
16   </servlet-mapping>
17   <welcome-file-list>
18     <welcome-file>index.html</welcome-file>
19     <welcome-file>index.htm</welcome-file>
20     <welcome-file>index.jsp</welcome-file>
21     <welcome-file>default.html</welcome-file>
22     <welcome-file>default.htm</welcome-file>
23     <welcome-file>default.jsp</welcome-file>
24   </welcome-file-list>
25 </web-app>
web.xml

 

 

 

 

 

 

 

 

servlet 三种方式   

 

1、implements Servlet

2、GenericServlet

3、HttpServlet    doget 

Servlet【接口】
GenericServlet【是 Servlet实现类】
httpservlet 是genericservlet的子类】

helloservlet 是 httpservlet 子类

 

posted @ 2020-07-01 12:43  2eggs  Views(167)  Comments(0)  Edit  收藏  举报