公司最新需求：根据传递的参数进行业务判断，如果符合条件则继续后面的业务逻辑，否则跳转到指定的错误页面。有些是请求的controller 使用了spring  aop的方式进行验证；但是有些是html页面，这些是需要使用过滤器了。

 

    1.框架是spring mvc框架

          添加自定义的过滤器

           

package cn.zm518.news.filter;import cn.zm518.circle.client.entity.CircleStateVo;import cn.zm518.circle.client.service.CircleClient;import cn.zm518.common.properties.SystemProperties;import cn.zm518.news.common.util.StringUtil;import org.apache.commons.lang.StringUtils;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.web.filter.OncePerRequestFilter;import javax.servlet.FilterChain;import javax.servlet.ServletException;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.IOException;import java.io.PrintWriter;/** * @Author fan * @Date 2018/07/18 * 拦截封号的文章列表以及详情页 */public class CircleFilter extends OncePerRequestFilter {    public static final String shequnHost = SystemProperties.getInstance().getProperty("community.rpc.url");    public static final String url = SystemProperties.getInstance().getProperty("seal.circle.url");    public static final int CIRCLE_STEAL = 2; //社群是否被封号    @Override    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {        // 请求的uri        String uri = request.getRequestURI();        // uri跳转到文章列表以及详情时才进行过滤        if (uri.indexOf("statics/html/article") == 1) {                // 执行过滤                // 获取登录的社群circleId                String circleId = request.getParameter("circleId");                if (StringUtils.isNotBlank(circleId)) {                    CircleClient circleClient = CircleClient.getInstance(shequnHost);                    CircleStateVo circleStateVo =  circleClient.getCircleStateVo(circleId);                    if (circleStateVo != null && circleStateVo.getState() == CIRCLE_STEAL){                        // 如果session中不存在登录者实体，则弹出框提示重新登录                        // 设置request和response的字符集，防止乱码                        request.setCharacterEncoding("UTF-8");                        response.setCharacterEncoding("UTF-8");                        PrintWriter out = response.getWriter();                         StringBuilder builder = new StringBuilder();                        builder.append("");                        out.print(builder.toString());                    }                } else {                    filterChain.doFilter(request, response);                }        } else {            filterChain.doFilter(request, response);        }    }}

 

2.在web.xml添加自定义的过滤器

        

         
      
       sessionFilter
          
      
       cn.zm518.news.filter.CircleFilter
        
       
         
      
       sessionFilter
          
      
       /*
        
     

 

3.比如请求本地的html页面

  http://localhost:8068/statics/html/article.html?circleId=4f98421633973cf75-7fef&newsId=41df20164b5c0c282-7ffe&followerId=&from=singlemessage

 会先进入自定义过滤器，如果不满足条件，则会优先过滤掉。负责会跳过继续执行后面的业务逻辑。