<filter>

        <filter-name>RefererFilter</filter-name>

        <filter-class>com.sdyy.common.filters.RefererFilter</filter-class>

    </filter>

    <filter-mapping>

        <filter-name>RefererFilter</filter-name>

        <url-pattern>*.do</url-pattern>

    </filter-mapping>  

package com.sdyy.common.filters;

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.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;  

public class RefererFilter extends HttpServlet implements Filter {  

    private static final long serialVersionUID = 1L;

    private FilterConfig filterConfig;  

    public void init(FilterConfig config) {

        this.filterConfig = config;

    }  

    public void doFilter(ServletRequest req, ServletResponse res,

            FilterChain chain) throws ServletException, IOException {  

        HttpServletRequest request = (HttpServletRequest) req;

        HttpServletResponse response = (HttpServletResponse) res;

        // 链接来源地址

        String referer = request.getHeader("referer");

        if (referer == null || !referer.contains(request.getServerName())) {

            /**

             * 如果 链接地址来自其他网站，则返回错误页面

             */

            request.getRequestDispatcher("/WEB-INF/error.jsp").forward(request, response);

        } else {

            chain.doFilter(request, response);

        }

    }  

    public void destroy() {

        this.filterConfig = null;

    }  

}