Question

如何验证正文请求部分不为空？

@PostMapping("/messages")
@ResponseStatus(HttpStatus.CREATED)
fun createMessage(@Valid @RequestPart message: MessageCreate,
                  @Valid @RequestPart @NotEmpty body: MultipartFile,
                  @RequestParam attachments: List<MultipartFile>) {
    return service.create(message, body, attachments)
}

我试图创建一个自定义验证器批注，该批注会检查body.isEmpty（）结果，但无效。缺什么？这样可以做到吗？

Answer 1

在请求正文对象之前添加@NotNull。

请参阅此以获取更多信息：Null request body not getting caught by Spring @RequestBody @Valid annotations

Answer 2

@PostMapping("/messages")
@ResponseStatus(HttpStatus.CREATED)
fun createMessage(@Valid @RequestPart message: MessageCreate,
                  @Valid @RequestPart @NotEmpty body: MultipartFile,
                  result: BindingResult,
                  @RequestParam attachments: List<MultipartFile>) {

    if (result.hasErrors()) {
        //handle validation failure
    }

    return service.create(message, body, attachments)
}

注意：BindingResult参数必须在经过验证的方法参数之后立即声明。

Spring MVC @RequestPart通过注释进行验证

2 个答案: