filter解决请求跨域的问题

前后端分离的接口请求由于分别部署在了不同的服务器下，所以往往存在请求跨域，这里后端需要处理返回response，可解决跨域问题，设置如下：

            response.setHeader("Access-Control-Allow-Origin", request.getHeader("origin"));
            response.setHeader("Access-Control-Allow-Credentials", "true");
            response.setHeader("Access-Control-Allow-Methods", "GET, HEAD, POST, PUT, PATCH, DELETE, OPTIONS");
            response.setHeader("Access-Control-Max-Age", "86400");
            response.setHeader("Access-Control-Allow-Headers", "accept,content-type");