現在servlet3.0都已經支持注解了，過濾器可以絲毫不用在web.xml里面配置，直接添加過濾器。

package?com.cisdimes.servlets;

import?java.io.IOException;

import?javax.servlet.Filter;
import?javax.servlet.FilterChain;
import?javax.servlet.FilterConfig;
import?javax.servlet.ServletException;
import?javax.servlet.ServletRequest;
import?javax.servlet.ServletResponse;
import?javax.servlet.annotation.WebFilter;
@WebFilter(urlPatterns={"/*"})
public?class?SystemFilter?implements?Filter?{


	@Override
	public?void?destroy()?{
		//?TODO?Auto-generated?method?stub
		
	}

	@Override
	public?void?doFilter(ServletRequest?request,?ServletResponse?response,
			FilterChain?chain)?throws?IOException,?ServletException?{
		System.out.println("開始過濾處理");
		chain.doFilter(request,?response);
		
		return;
	}

	@Override
	public?void?init(FilterConfig?arg0)?throws?ServletException?{
		System.out.println("開始過濾器初始化");
		
	}

}

這是web.xml

<?xml?version="1.0"?encoding="UTF-8"?>
<web-app?xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"?xmlns="http://java.sun.com/xml/ns/javaee"?xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"?xsi:schemaLocation="http://java.sun.com/xml/ns/javaee?http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"?id="WebApp_ID"?version="3.0">
??<display-name>dynamicwebapp</display-name>
??
??
??<welcome-file-list>
??????<welcome-file>index.jsp</welcome-file>
??</welcome-file-list>
</web-app>

想要過濾網頁，應該是修改過濾規則為*.jsp或者*.html看你用的網頁是什么，jsp就是前者，html就是后者