Question

我有一个简单的代码，当RequestBody中没有customerId时，返回错误json。

VO类：

public class OrderVO {

    private int orderId;
    @NotNull(message = "CustomerId Cant be null")
    private Long customerId;
}

控制器方法：

@RequestMapping(value="/testOrderbyOrderid", method=RequestMethod.GET,produces=MediaType.APPLICATION_JSON_VALUE)
public void testOrderJson (@Valid @RequestBody OrderVO orderVO ) {

}

当前，当RequestBody中没有customerId时，返回的JSON的结构如下所示：

{
    "timestamp": "2019-05-14T17:08:01.318+0000",
    "status": 400,
    "error": "Bad Request",
    "errors": [
        {
            "codes": [   ],
            "arguments": [     ],
            "defaultMessage": "CustomerId Cant be null",
            "objectName": "orderVO",
            "field": "customerId",
            "rejectedValue": null,
            "bindingFailure": false,
            "code": "NotNull"
        }
    ],
    "message": "Validation failed for object='orderVO'. Error count: 1",
    "path": "/testOrderbyOrderid"
}

如何将@Notnull返回的上述Json结构更改为如下所示的JSON结构：

{
    "timestamp": "2019-05-14T17:08:01.318+0000",
    "status": 400,
    "error": "Bad Request",
    "message": "CustomerId Cant be null"
}

编辑-我已经知道我们可以抛出自定义异常并在ControllerAdvice中对其进行处理，但考虑到验证所需的字段数= 20，检查null和throw异常所需的代码量也会增加，代码看起来很难看。这就是为什么我发布此Qn。

Answer 1

将以下方法添加到带注释的异常通知处理程序的控制器建议中：

    @Override
    protected ResponseEntity<Object> handleMethodArgumentNotValid(
            MethodArgumentNotValidException ex, HttpHeaders headers, HttpStatus status,
            WebRequest request) {
        //return your custom error 
        //you can access to field errors using
        //ex.getBindingResult().getFieldErrors()
    }


    @ExceptionHandler(value = { javax.validation.ConstraintViolationException.class })
    protected ResponseEntity<Object> handleConstraintViolation(
            javax.validation.ConstraintViolationException ex) {
        //return your custom error message
    }

    @ExceptionHandler(value = { org.hibernate.exception.ConstraintViolationException.class })
    protected ResponseEntity<Object> handleHibernateConstraintViolation(
            org.hibernate.exception.ConstraintViolationException ex) {
        //return your custom error message
    }

Answer 2

我想我们也可以这样编写Controller建议，而无需扩展ResponseEntityExceptionHandler并覆盖其任何方法

sphinx-build -M foo . _build

如何更改与@NotNull批注对应的响应JSON返回

2 个答案: