登录失效后ajax访问后台问题解决

//ajax请求方式会获取到 XMLHttpRequest ,其他请求方式没有这个请求头
String requestType = request.getHeader("X-Requested-With");
if(StringUtil.isNotEmpty(requestType) && "XMLHttpRequest".equals(requestType)) {
String jsonStr = "{\"code\":\"not_login\",\"msg\":\"没有登录\"}";
UtilUrl.setJsonResponse(response, jsonStr);
}else {
request.setAttribute("referer", url);
request.getRequestDispatcher("/jsp/user/login.jsp").forward(request, response);
}

/**
* 设置json返回数据
* @param request
* @return
*/
public static void setJsonResponse(HttpServletResponse response, String jsonStr){
response.setCharacterEncoding("UTF-8");
response.setContentType("application/json; charset=utf-8");
PrintWriter out = null;
try {
out = response.getWriter();
out.append(jsonStr);
} catch (Exception e) {
log.error("设置json返回数据失败:"+e.getMessage());
} finally {
if (out != null) {
out.close();
}
}
}

//权限拦截自动跳转
if(status == 200){
try{
var obj = eval('(' + responses.text + ')');
if(obj.code=='not_login'){
window.location.reload();
return false;
}
}catch(e){

}
}