jsp过滤器Filter配置过滤类型汇总

一、配置方法1 映射过滤应用程序中所有资源<filter>    <filter-name>loggerfilter</filter-name>    <filter-class>myfilter.LoggerFilter</filter-class></filter><filter-mapping>    <filter-name>loggerfilter</filter-name>    <url-pattern>/*</url-pattern> //访问当前主机，当前应用程序根下的所有文件包括多级子目录下的所有文件，注意这里*前有“/”</filter-mapping>2 过滤指定的类型文件资源<filter>    <filter-name>loggerfilter</filter-name>    <filter-class>myfilter.LoggerFilter</filter-class></filter><filter-mapping>    <filter-name>loggerfilter</filter-name>   <url-pattern>*.html</url-pattern> //访问当前主机，当前应用程序根目录下的所有html文件，注意：*.html前没有“/”,否则错误</filter-mapping>其中*.html要过滤jsp那么就改*.html为*.jsp，但是注意没有“/”斜杠。如果要同时过滤多种类型资源：方法1 url-pattern 分开写<filter>    <filter-name>loggerfilter</filter-name>    <filter-class>myfilter.LoggerFilter</filter-class></filter><filter-mapping>    <filter-name>loggerfilter</filter-name>    <url-pattern>*.html</url-pattern></filter-mapping><filter-mapping>    <filter-name>loggerfilter</filter-name>    <url-pattern>*.jsp</url-pattern>//访问当前主机，当前应用程序根目录以所有及子目录下的所有jsp文件</filter-mapping>方法2 将url-pattern合并<filter>    <filter-name>loggerfilter</filter-name>    <filter-class>myfilter.LoggerFilter</filter-class></filter><filter-mapping>    <filter-name>loggerfilter</filter-name>    <url-pattern>*.html;*.jsp</url-pattern></filter-mapping>//*.html;*.jsp两类型之间用分号;间隔3 过滤指定的目录下的所有文件<filter>    <filter-name>loggerfilter</filter-name>    <filter-class>myfilter.LoggerFilter</filter-class></filter><filter-mapping>    <filter-name>loggerfilter</filter-name>    <url-pattern>/folder_name/*</url-pattern>//访问当前主机，当前应用程序根目录下的folder_name子目录（可是多级子目录）下所有文件</filter-mapping>4 过滤指定的servlet<filter>    <filter-name>loggerfilter</filter-name>    <filter-class>myfilter.LoggerFilter</filter-class></filter><filter-mapping>    <filter-name>loggerfilter</filter-name>    <servlet-name>loggerservlet</servlet-name></filter-mapping><servlet>    <servlet-name>loggerservlet</servlet-name>    <servlet-class>myfilter.LoggerServlet</servlet-class></servlet>5 过滤指定文件（即单一文件）<filter>    <filter-name>loggerfilter</filter-name>    <filter-class>myfilter.LoggerFilter</filter-class></filter><filter-mapping>    <filter-name>loggerfilter</filter-name>    <url-pattern>/simplefilter.html</url-pattern></filter-mapping>6  过滤指定目录下的指定类型的所有文件这种情况下在web.xml中无法一次性配置完成，需要结合filter的实现类首先在web.xml中配置过滤指定目录下的所有文件<filter>    <filter-name>loggerfilter</filter-name>    <filter-class>myfilter.LoggerFilter</filter-class></filter><filter-mapping>    <filter-name>loggerfilter</filter-name>    <url-pattern>/dir_name/*</url-pattern></filter-mapping>然后在filter的实现类中的doFilter方法中获取请求的uri或者url，判断uri或者url中是否包含指定文件类型的字符串，决定是否过滤//获得用户请求的uriString uri = request.getRequestURI();if(uri.contains(".jsp")||uri.contains(".html"))System.out.PRintln("开始过滤"+url);7  过滤指定目录下指定类型的单一文件<filter>    <filter-name>loggerfilter</filter-name>    <filter-class>myfilter.LoggerFilter</filter-class></filter><filter-mapping>    <filter-name>loggerfilter</filter-name>    <url-pattern>/dir_name/index.jsp</url-pattern></filter-mapping>以上都要注意是否有斜杠“/”二、实例不缓存文件<filter>    <filter-name>NoCache</filter-name>    <filter-class>com.sys.common.Filters.ResponseHeaderFilter        </filter-class>    <init-param>      <param-name>Cache-Control</param-name>      <param-value>no-cache, must-revalidate</param-value>    </init-param>  </filter>缓存文件一周  <filter>    <filter-name>CacheForWeek</filter-name>    <filter-class>com.sys.common.Filters.ResponseHeaderFilter        </filter-class>    <init-param>      <param-name>Cache-Control</param-name>      <param-value>max-age=604800, public</param-value>    </init-param>  </filter><filter-mapping>    <filter-name>CacheForWeek</filter-name>    <url-pattern>/images/*</url-pattern>  </filter-mapping>  <filter-mapping>    <filter-name>CacheForWeek</filter-name>    <url-pattern>*.js</url-pattern>  </filter-mapping>  <filter-mapping>    <filter-name>CacheForWeek</filter-name>    <url-pattern>*.CSS</url-pattern>  </filter-mapping>自定义的filter：public class ResponseHeaderFilter implements Filter {    FilterConfig fc;    public void doFilter(ServletRequest req, ServletResponse res,FilterChain chain) throws IOException, ServletException {        HttpServletResponse response = (HttpServletResponse) res;        for (Enumeration e = fc.getInitParameterNames(); e.hasMoreElements();) {            String headerName = (String) e.nextElement();            response.addHeader(headerName, fc.getInitParameter(headerName));        }        chain.doFilter(req, response);    }    public void init(FilterConfig filterConfig) {        this.fc = filterConfig;    }    public void destroy() {        this.fc = null;    }

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原帖地址：http://blog.sina.com.cn/s/blog_7ffb8dd501013hqc.html