java Servlet Filter 拦截Ajax请求，统一处理session超时的问题

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后台增加filter，注意不要把druid也屏蔽了

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 org.apache.shiro.SecurityUtils;
import org.apache.shiro.subject.Subject;import cn.zsmy.constant.Constant;
import cn.zsmy.entity.User;/** * session超时过滤 *  * @date 2016-10-20*/  
public class SessionFilter implements Filter {  @Override  public void init(FilterConfig filterConfig) throws ServletException {  }  @Override  public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException,  ServletException {  HttpServletRequest httpServletRequest = (HttpServletRequest) request;  HttpServletResponse httpServletResponse = (HttpServletResponse) response;  //只过滤了ajax请求时session超时if (httpServletRequest.getHeader("x-requested-with") != null  && httpServletRequest.getHeader("x-requested-with").equalsIgnoreCase("XMLHttpRequest")) {  Subject subject = SecurityUtils.getSubject();User user = (User) subject.getPrincipal();if(user == null){Constant.MY_LOG.debug("filter：sessionstatus timeout！");//如果是ajax请求响应头会有，x-requested-with  httpServletResponse.setHeader("sessionstatus", "timeout");//在响应头设置session状态  return;  }} chain.doFilter(request, response);  }  @Override  public void destroy() {  }  }