Web.xml基本配置

1. 指定欢迎页

<welcome-file>index.jsp</welcome-file>

2. 命名与定制url

<servlet>

   <servlet-name>…</servlet-name>

   <servlet-class>…</servlet-class>

</servlet>

<servlet-mapping>

   <servlet-name>…</servlet-name>

   <url-pattern>…</url-pattern>

</servlet-mapping>

3. 定制初始参数

<servlet>

      <servlet-name>…</servlet-name>

      <servlet-class>…</servlet-class>

   <init-param>

      <param-name>…</param-name>

      <param-value>…</param-value>

   </init-param>

</servlet>

注：调用getServletConfig().getInitParameter(“name”),获取参数名对应的值

4. 指定错误处理页面，可以通过“异常类型”或“错误码”来指定错误处理页面

<error-page>

   <error-code>404</error-code>

   <location>/error404.jsp</location>

</error-page>

5. 设置过滤器

<filter>

      < filter -name>…</ filter-name>

      < filter -class>…</ filter-class>

</filter >

<filter -mapping>

      < filter -name>…</ filter-name>

      <url-pattern>…</url-pattern>

</filter -mapping>

6. 设置监听器

<listeren>

   <listeren-class>…</listeren-class>

</listeren>

7. 设置session过期时间

<session-config>

   <session-timeout>30</session-timeout>

</session-config>