web.xml配置过滤器的问题

Question

<filter-mapping>
<filter-name>CheckStatus</filter-name>
<servlet-name>/*</servlet-name>
</filter-mapping>
<filter-mapping>  
  <filter-name>CharacterEncoding</filter-name>  
  <url-pattern>/*</url-pattern>  
</filter-mapping>改为<filter-mapping>
<filter-name>CheckStatus</filter-name>
<servlet-name>CharacterEncoding</servlet-name>
</filter-mapping>
<filter-mapping>  
  <filter-name>CharacterEncoding</filter-name>  
  <url-pattern>/*</url-pattern>  
</filter-mapping>

Answer 1

<filter-mapping>
<filter-name>CheckStatus</filter-name>
<servlet-name>/*</servlet-name>
</filter-mapping>
<filter-mapping>  
  <filter-name>CharacterEncoding</filter-name>  
  <url-pattern>/*</url-pattern>  
</filter-mapping> 改为
<filter-mapping>
<filter-name>CheckStatus</filter-name>
<servlet-name>/*</servlet-name>
</filter-mapping>
<filter-mapping>  
  <filter-name>CharacterEncoding</filter-name>  
  <url-pattern>/*</url-pattern>  
</filter-mapping> 

Answer 2

不知道你写的啥
<filter>
<filter-name>CheckStatus</filter-name>
<filter-class>com.youthzone.filter.CheckStatusFilter</filter-class>
</filter>
<filter-mapping>   
  <filter-name>CheckStatus</filter-name>   
  <url-pattern>/*</url-pattern>   
</filter-mapping> 先配置filter:
<filter-name>你这个filter的名字
<filter-class>filter对应的类
然后配置filter的映射
<filter-name>需要映射的filter
<url-pattern>触发请求

Answer 3

<filter-mapping>
<filter-name>CheckStatus</filter-name>
<servlet-name>/*</servlet-name>
</filter-mapping>
改成
<filter-mapping>
    <filter-name>CheckStatus</filter-name>
    <url-pattern>/*</url-pattern>
    <dispatcher>FORWARD</dispatcher>
    <dispatcher>REQUEST</dispatcher>
</filter-mapping>“<servlet-name>/*</servlet-name>”这个写错了

Answer 4

<servlet-name>/*</servlet-name>
这句也换成url-pattern

Answer 5

 <servlet>   
          <servlet-name>action</servlet-name>   
          <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>   
          <init-param>   
              <param-name>application</param-name>   
              .....   
  </servlet>   
  servlet-mapping>   
          <servlet-name>action</servlet-name>   
          <url-pattern>*.do</url-pattern>   
      </servlet-mapping>   
  ...........   
  首先解释   
  <servlet>   
          <servlet-name>action</servlet-name>   
          <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>   
          <init-param>   
              <param-name>application</param-name>   
              .....   
  </servlet>   
  那个action是org.apache.struts.action.ActionServlet的别名(听着好听,顺耳,方便)   
  实际执行的时候,凡是action类型的东东都到org.apache.struts.action.ActionServlet去执行   
    
  什么是action类型的呢?下面定义就是了:   
  servlet-mapping>   
          <servlet-name>action</servlet-name>   
          <url-pattern>*.do</url-pattern>   
      </servlet-mapping>   
  也就是说,凡是在路径下出现   ***.do的都是action类型的.比如说   
  http://localhost/app/login.do   
  这个login.do就是action类型的.         那么你编写的login.java就是一个ActionServlet(action类型)   
    
  当然,真正执行的时候是执行.class文件,比如说login~.class(可能不是login.class，例如loginAction.class)