web.xml<servlet>
    <servlet-name>LoginSvt</servlet-name>
    <servlet-class>com.servlet.LoginSvt</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>LoginSvt</servlet-name>
    <url-pattern>/login</url-pattern>
  </servlet-mapping>jsp<form action="/OracleLogin/login.do" method="post" name="mf">为什么还404啊?