昨天写了个Filter！

昨天写了个Filter！

昨天看了看自己的资源存放站点，发现当机了，很奇怪：都是静态的东西怎么会当机？

看了看日志，NND，日志10几个G，再仔细看，都是一个IP发请求，获得一个文件，每秒4次，可怜我的TOMCAT，怎么撑得住这么搞？

再仔细想，不对啊！下一个文件只是一个请求即可，着明显是恶意攻击！

没办法，写了个Filter，只允许校内访问。

列举如下，备忘。

---------------------

package me;/* * Author: Elpout * DateTime: 2008-06-18 17:46 * Lisence: Just You Like! **/import java.io.IOException;import javax.servlet.*;import javax.servlet.http.*;public class IPFilter implements Filter {    protected FilterConfig filterConfig = null;    protected String[] AIP = null;    protected String AllowedIP = null;    protected String ErrorPage = null;    public void destroy() {        this.filterConfig = null;    }    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)     throws IOException, ServletException {         HttpServletRequest req = (HttpServletRequest) request;    HttpServletResponse resp = (HttpServletResponse) response;Boolean Flag = false;String cip=req.getRemoteHost();for (String TB:AIP){if (cip.startsWith(TB)) {       Flag = true;break;}}if (Flag)     chain.doFilter(request, response);else         resp.sendRedirect (this.ErrorPage);    }    public void init(FilterConfig filterConfig) throws ServletException {        this.filterConfig = filterConfig;        this.AllowedIP = filterConfig.getInitParameter("AllowedIP");        this.ErrorPage = filterConfig.getInitParameter("RePage");        this.AIP = AllowedIP.split(";");      }}

源码及Class&web.xml下载：http://onpm.net/im/IPFilter.rar