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uri
String 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脚本之家。
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