核心方法:

HttpServletRequest response.sendRedirect(url)

举个例子
项目需求:在一个页面中点击下载按钮会去访问后端一个接口然后下载文件,当登录超时失效时,点击下载按钮进行跳转登录页.
解决方法:

    /*** 导出Word* 中文会接受不到请求,前端需要url编码一下*/@ApiOperation(value = "导出Word")@ApiImplicitParam(name = "anhao", value = "案号", required = true)@GetMapping("/createWord")public Response createWord(HttpServletResponse response, HttpServletRequest request, @RequestParam("anhao") String anhao) throws IOException{Object mapObject = MemoryCache.get(anhao);//如果登录超时,就获取不到缓存了,就会为空.if (mapObject == null) {String referer = request.getHeader("Referer");//这是获取点击下载按钮的那个页面的URLresponse.sendRedirect(referer);//上面再次访问点击按钮那个页面,如果登录超时就会跳转到登录页,也可以通过请求头拿到项目的IP,端口再拼接上登录的字段URL直接跳转到登录页.return null;}else {//这里省略下载文件的逻辑}}