在POST请求中返回消息体的Spring boot多响应代码

Question

在我的spring boot应用程序中，我想用响应体返回不同类型的响应代码。

@RequestMapping(method = RequestMethod.POST, value = "/users")
public ResponseEntity<User> userSignsUp(@RequestBody User user) {

  if(userService.getUserByNic(user.getNic()).equals(userService.getUserByNic(user.getNic()))) {
    UserErrorBean userError = new UserErrorBean("User already exist","406 error");  
    return ResponseEntity<>(userError ,HttpStatus.CONFLICT); }

   userService.userSave(user);
   return ResponseEntity<>(user, HttpStatus.CREATED);
}

这是我的Rest控制器，我想根据不同的条件返回不同的响应。但它仅在满足用户NIC条件时返回条件。如果将用户添加到数据库，它会抛出NullPointerException（）。

我想根据请求返回响应。

Answer 1

您可以这样编写一个简单的RestController。

@PostMapping("/users")
    public ResponseEntity<User> userSignsUp(@RequestBody User user) {
        if(user == null){
            return new ResponseEntity<>(HttpStatus.BAD_REQUEST);
        }
        if(userService.getUserByNic(user.getNic()).equals(userService.getUserByNic(user.getNic()))) {
            UserErrorBean userError = new UserErrorBean("User already exist","406 error");
            return new ResponseEntity<>(userError, HttpStatus.CONFLICT);
        }

        if(userService.userSave(user)) { // make it return boolean on success or failed
            return new ResponseEntity<>(user, HttpStatus.CREATED);
        } else {
            return new ResponseEntity<>(HttpStatus.BAD_REQUEST);
        }
    }