struts2、jsp的简单路径的简单拦截

  <filter>
  <filter-name>UsersFilter</filter-name>
  <filter-class>com.web.UsersFilter</filter-class>
 </filter>
 <filter-mapping>
  <filter-name>UsersFilter</filter-name>
  <url-pattern>/*</url-pattern>
 </filter-mapping> 

package com.web;
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.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class UsersFilter implements Filter {
    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {
        // 设置请求的字符编码
        request.setCharacterEncoding("UTF-8");
        // 设置返回请求的字符编码
        response.setCharacterEncoding("UTF-8");
        // 转换ServletRequest为 HttpServletRequest
        HttpServletRequest req = (HttpServletRequest) request;
        // 转换ServletResponse为HttpServletRequest
        HttpServletResponse res = (HttpServletResponse) response;
        // 获取Session
        HttpSession session = req.getSession();
        // 获取Session中存储的对象
        Object o = session.getAttribute("user");
        // 获取当前请求的URI
        String url = req.getRequestURI();
        // 判断Session中的对象是否为空；判断请求的URI是否为不允许过滤的URI
        if (o==null && url.indexOf("test.jsp")<0
                && url.indexOf("comment.jsp")<0
                && url.indexOf("link.jsp")<0) {
            chain.doFilter(request, response);
            res.setHeader("Cache-Control","no-store");
            res.setDateHeader("Expires",0);
            res.setHeader("Pragma","no-cache");
            res.flushBuffer();
            }
    }

    public void destroy() {
        // TODO Auto-generated method stub

    }

    public void init(FilterConfig arg0) throws ServletException {
        // TODO Auto-generated method stub

    }   

}  

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