用servet做的登陆注册的程序
，点击之后
出现
下面是配置xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0"
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_3_0.xsd">
<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>UserLoginServlet</servlet-name>
<servlet-class>com.bie.servlet.UserLoginServlet</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>UserRegisterServlet</servlet-name>
<servlet-class>com.bie.servlet.UserRegisterServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>UserLoginServlet</servlet-name>
<url-pattern>/userlogin</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>UserRegisterServlet</servlet-name>
<url-pattern>/userregister</url-pattern>
</servlet-mapping>
</web-app>
好像是缺失类的问题，不过不知道怎么操作