springboot自定义http反馈状态码

@RequestMapping(value = "/user", method = RequestMethod.GET)
public ResponseEntity<Map<String,Object>> getUser() throws IOException{
    Map<String,Object> map = new HashMap<String,Object>();
    map.put("name", "zhangsan");
    return new ResponseEntity<Map<String,Object>>(map,HttpStatus.OK); // OK是200，BAD_REQUEST是400
}