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我正在将基于 Servlet 2.5 的 webapp 迁移到 Servlet 3.0 并遇到了这个问题，我不知道如何将这些不同的过滤器映射压缩到@WebFilter该类的一个注释中。

过滤器：

<!-- Day is 12 hours, so if we update at night the new content will be fetched first     thing in the morning -->
<filter>
    <filter-name>CacheForDay</filter-name>
    <filter-class>x.web.client.filter.CacheHeaderFilter</filter-class>
    <init-param>
        <param-name>CacheTime</param-name>
        <param-value>43200</param-value>
    </init-param>
</filter>

<filter>
    <filter-name>CacheForWeek</filter-name>
    <filter-class>x.web.client.filter.CacheHeaderFilter</filter-class>
    <init-param>
        <param-name>CacheTime</param-name>
        <param-value>604800</param-value>
    </init-param>
</filter>

<filter>
    <filter-name>CacheForMonth</filter-name>
    <filter-class>x.web.client.filter.CacheHeaderFilter</filter-class>
    <init-param>
        <param-name>CacheTime</param-name>
        <param-value>18144000</param-value>
    </init-param>
</filter>

<filter>
    <filter-name>noCache</filter-name>
    <filter-class>x.web.client.filter.CacheHeaderFilter</filter-class>
    <init-param>
        <param-name>CacheTime</param-name>
        <param-value>0</param-value>
    </init-param>
</filter>

过滤器映射：

<filter-mapping>
    <filter-name>CacheForDay</filter-name>
    <url-pattern>*.png</url-pattern>
  </filter-mapping>

  <filter-mapping>
    <filter-name>CacheForDay</filter-name>
    <url-pattern>*.gif</url-pattern>
  </filter-mapping>

  <filter-mapping>
    <filter-name>CacheForDay</filter-name>
    <url-pattern>*.js</url-pattern>
  </filter-mapping>

  <filter-mapping>
    <filter-name>CacheForDay</filter-name>
    <url-pattern>*.css</url-pattern>
  </filter-mapping>

  <filter-mapping>
    <filter-name>CacheForMonth</filter-name>
    <url-pattern>*.ico</url-pattern>
  </filter-mapping>

我该如何替换它们@WebFilter？

4

1 回答 1

3

用 注释的单个类是不可能的@WebFilter。您必须：

  • 继续使用web.xml方式；考虑到这种情况，这还不错。
  • 在基类中实现逻辑并编写琐碎的扩展，用适当的@WebFilter. 我觉得这看起来不太好。

后面的例子：

public class BaseCacheFilter implements Filter
{
    public void doFilter(...) {
        ...implementation here...
    }
    ....
}

@WebFilter(
    urlPatterns={"*.png","*.gif",...},
    initParams=@WebInitParam(name="CacheTime",value="43200")
)
public class CacheForDay extends BaseCacheFilter
{ /* EMPTY */ }
于 2013-09-17T16:06:35.193 回答