拦截器拦截ajax请求不跳转页面问题

1.拦截器中的代码

@Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String sessionId = CookieUtil.readLoginToken(request);
        //获取当前的权限地址 /bg/dicUser/toDicUserList;jsessionid=1F3EA8235E7FD7322DBDD01795F0926C
        String requestURI = request.getRequestURI();
        List<String> str = Splitter.on(";").splitToList(requestURI);
        String aclUrl = str.get(0);

        //从redis中获取该用户的权限列表
        String allURIByRoleId = RedisPoolUtil.get(sessionId+Const.CURRENT_URIBYROLEID);
        List<String> list = JsonUtil.string2Obj(allURIByRoleId, new TypeReference<List<String>>() {
        });

        if (list.contains(aclUrl)){
            System.err.println("通过,拦截路径" + aclUrl);
            return true;
        }else{
            System.err.println("没有权限");
//如果request.getHeader("X-Requested-With") 返回的是"XMLHttpRequest"说明就是ajax请求，需要特殊处理 否则直接重定向就可以了
            if("XMLHttpRequest".equals(request.getHeader("X-Requested-With"))){
                //告诉ajax我是重定向
                response.setHeader("REDIRECT", "REDIRECT");
                //告诉ajax我重定向的路径
                response.setHeader("CONTENTPATH", "/jump/no_permission");
                response.setStatus(HttpServletResponse.SC_FORBIDDEN);
            }else{
                response.sendRedirect("/jump/no_permission");
            }

            return false;
        }
    }

2.ajax请求 加入 complete 处理

layer.confirm('真的删除行么', function (index) {
                    $.ajax({
                        url: '/bg/dicRole/del',
                        type: 'post',
                        dataType: 'json',
                        data: {roleId: data.roleId},
                        success: function (data) {
                            if (data.code == "200") {
                                layer.msg(data.msg, {icon: 1, time: 500}, function () {
                                    window.location.reload();
                                });
                            } else {
                                layer.msg(data.msg, {icon: 2, time: 1000});
                            }
                        },
                        complete : function(xhr, status) {
                            //拦截器拦截没有权限跳转
                            // 通过xhr取得响应头
                            var REDIRECT = xhr.getResponseHeader("REDIRECT");
                            //如果响应头中包含 REDIRECT 则说明是拦截器返回的
                            if (REDIRECT == "REDIRECT")
                            {
                                document.location.href = xhr.getResponseHeader("CONTEXTPATH");
                            }
                        }

                    })
                });