首先在js文件中添加如下代码：

$.ajaxSetup({     
        contentType:"application/x-www-form-urlencoded;charset=utf-8",complete:function(XMLHttpRequest,textStatus){  
            var sessionstatus=XMLHttpRequest.getResponseHeader("sessionstatus");  
            if(sessionstatus=="sessionOut"){     
            	location.href = "../login.jsp?t=" + new Date().getTime();     
            }  
        }  
    });

然后在Filter中添加如下代码：

HttpSession session = request.getSession(true);
	    if (request.getHeader("x-requested-with") != null && request.getHeader("x-requested-with")  
	                .equalsIgnoreCase("XMLHttpRequest") && session.getAttribute("loginID") == null){  
	    	response.setHeader("sessionstatus","sessionOut");  
	        response.getWriter().print("sessionOut");  
	    }else{
	    	chain.doFilter(req,res);
	    }

其中location.href中添加类似于url?xxx=随机数是为了防止JSP页面的缓存，随机数可以赋值为new Date().getTime()。