web配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
    xmlns="https://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="https://java.sun.com/xml/ns/javaee 
    https://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <display-name></display-name>

  <servlet>
    <servlet-name>registServlet</servlet-name>
    <servlet-class>com.cn.servlet.registServlet</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>loginServlet</servlet-name>
    <servlet-class>com.cn.servlet.loginServlet</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>ValidateCodeServlet</servlet-name>
    <servlet-class>com.cn.servlet.ValidateCodeServlet</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>selectServlet</servlet-name>
    <servlet-class>com.cn.servlet.selectServlet</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>addServlet</servlet-name>
    <servlet-class>com.cn.servlet.addServlet</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>updateServlet</servlet-name>
    <servlet-class>com.cn.servlet.updateServlet</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>deleteServlet</servlet-name>
    <servlet-class>com.cn.servlet.deleteServlet</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>CutPageServlet</servlet-name>
    <servlet-class>com.cn.servlet.CutPageServlet</servlet-class>
  </servlet>



  <servlet-mapping>
    <servlet-name>registServlet</servlet-name>
    <url-pattern>/registServlet</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>loginServlet</servlet-name>
    <url-pattern>/loginServlet</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>ValidateCodeServlet</servlet-name>
    <url-pattern>/validateCodeServlet</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>selectServlet</servlet-name>
    <url-pattern>/selectServlet</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>addServlet</servlet-name>
    <url-pattern>/addServlet</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>updateServlet</servlet-name>
    <url-pattern>/updateServlet</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>deleteServlet</servlet-name>
    <url-pattern>/deleteServlet</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>CutPageServlet</servlet-name>
    <url-pattern>/cutPage</url-pattern>
  </servlet-mapping>

  <filter>
  <filter-name>f1</filter-name>
  <filter-class>com.cn.servlet.fliter</filter-class>
  </filter>
  <filter-mapping>
  <filter-name>f1</filter-name>
  <url-pattern>/studentManager.jsp</url-pattern>
  </filter-mapping>

  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>