攔截器程式碼：

package com.xlqh.outlook.shirofilter;
import java.io.IOException;
import org.apache.shiro.web.filter.PathMatchingFilter;
import com.xlqh.outlook.MyShiroConstants.MyShiroConstants;
import com.xlqh.outlook.SessionManagement.SessionManagement;
import com.xlqh.outlook.entity.yuuser;
import javax.servlet.ServletRequest;
import
 
 javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

//自定義攔截器,Session過期AJAX處理
public class SessionExpiredFilter extends PathMatchingFilter {


    @Override   
    protected boolean onPreHandle(ServletRequest  request, ServletResponse response, Object mappedValue) throws
 
 Exception {
          yuuser sys = (yuuser) SessionManagement.getSession(MyShiroConstants.Session_USER);    
         if(sys==null){
            System.out.println("session過期");
            if ("XMLHttpRequest".equalsIgnoreCase(((HttpServletRequest) request).getHeader("X-Requested-With"))) {
                //ajax的sesson處理
 

                //返回狀態碼
                 onLoginFail(response);
                return false;
                }
            else{
                //普通的處理，直接給到下一個攔截器
                 return true;   
            }
        }

        return true;
    }

    //session過期給403狀態碼
    private void onLoginFail(ServletResponse response) throws IOException {
        HttpServletResponse httpResponse = (HttpServletResponse) response;
        httpResponse.setStatus(403);
        httpResponse.getWriter().write("session超時了");
    }


}

前臺頁面全域性需要處理的，基於jquery的ajax請求都會被攔截

全域性的js片段：

var timeoutlogin="/login?code=22";

    $.ajaxSetup({
        contentType : "application/x-www-form-urlencoded;charset=utf-8",
        cache : false,
        complete : function(data, TS) {
            //對返回的資料data做判斷
            debugger;
            //403是後臺攔截器那兒定義的，
            if (data.status == 403) {
                //session過期的話，就location到一個頁面
                location.href=timeoutlogin;
                return;
            }
        }
    });

ajax請求的js：

function test() {

        var valusid = $("#select2").val();
        $.post("yurole/selectuserrole", {"userid" : valusid}, function(data) {
            $("#div2").html("");
            debugger;
            for ( var i = 0; i < data.length; i++) {
                $("#div2").append("<p><a href='"+data[i].menuUlr+"' target='content' >"+ data[i].menuName + "<a/></p>");
            }

        });

    }

shiro配置：
需要把session攔截器放在登入攔截器前面