1 package jxf.servlet;
 2 import java.io.IOException;
 3 import java.util.Date;
 4 import java.io.PrintWriter;
 5 import java.text.SimpleDateFormat;
 6
 7 import javax.servlet.ServletException;
 8 import javax.servlet.http.HttpServlet;
 9 import javax.servlet.http.HttpServletRequest;
10 import javax.servlet.http.HttpServletResponse;
11 public class TestServlet extends HttpServlet {
12     public void doGet(HttpServletRequest request, HttpServletResponse response)
13             throws ServletException, IOException {
14         response.getWriter().write(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()));
15         System.out.println("this is TestServlet");
16     }
17 }

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
 3   <display-name></display-name>
 4   <servlet>
 5     <description>This is the description of my J2EE component</description>
 6     <display-name>This is the display name of my J2EE component</display-name>
 7     <!--3、 servlet的内部名称-->
 8     <servlet-name>TestServlet</servlet-name>
 9     <!--4、 servlet的类全名： 包名+简单类名 -->
10     <servlet-class>jxf.servlet.TestServlet</servlet-class>
11   </servlet>
12   <servlet-mapping>
13     <!--2、 servlet的映射内部名称，通过他可以找到上面的servlet的内部名称-->
14     <servlet-name>TestServlet</servlet-name>
15     <!--1、 请求servlet的映射路径-->
16     <url-pattern>/TestServlet</url-pattern>
17   </servlet-mapping>
18   <welcome-file-list>
19     <welcome-file>index.jsp</welcome-file>
20   </welcome-file-list>
21 </web-app>

<servlet><servlet-name>default</servlet-name><servlet-class>org.apache.catalina.servlets.DefaultServlet</servlet-class><init-param><param-name>debug</param-name><param-value>0</param-value></init-param><init-param><param-name>listings</param-name><param-value>false</param-value></init-param><load-on-startup>1</load-on-startup></servlet><!--中间有很多代码-->
<servlet-mapping><servlet-name>default</servlet-name><url-pattern>/</url-pattern></servlet-mapping>