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; }}

以上这篇JSP过滤器Filter配置过滤类型全部汇总就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。