[英]Validate Request body in spring using @Valid
我想验证JSON对象的属性长度。 我正在使用@Size注释指定最大长度,如下所示。
@JsonRootName("question")
public class QuestionJson {
@JsonProperty(value = "id", required = false)
private Long id;
@JsonProperty(value = "text", required = true)
private String label;
@JsonProperty(value = "answers", required = true)
private List<AnswerJson> answers;
}
@JsonRootName("answer")
public class AnswerJson {
@JsonProperty(value = "id", required = false)
private Long id;
@JsonProperty(value = "type", required = true)
private String type;
@JsonProperty(value = "label", required = true)
@Size(message = "size should not be long", max = 10)
private String label;
}
我在控制器中的请求映射如下所示:
@RequestMapping(value = "/api/answer", method = RequestMethod.POST, consumes = MediaType.APPLICATION_JSON_UTF8_VALUE)
public AnswerJson createQuestion(@RequestHeader(HttpHeaders.AUTHORIZATION) final String authorizationHeader, @Valid @RequestBody final QuestionJson questionJson) {
// some code here....
return answer;
}
更新:验证适用于外部元素,例如。 text
在我的情况,但在嵌套列表上失败。
每次我们使用@Valid
批注时,我们还将包括BindingResult
实例作为方法参数,它包含@Valid
标记的参数错误(如果有):
public final @ResponseBody String theMethod(
final @Valid ValidableObjectImpl validableObject,
BindingResult result) {
try {
if (result.hasErrors()) {
for (FieldError error : result.getFieldErrors()){
// do something
}
// return error
}
} catch (Exception e) {
// ...
}
}
找到了解决方案。 我们需要在嵌套对象的声明之前将@Valid
批注添加到。 例如
@JsonRootName("question")
public class QuestionJson {
@JsonProperty(value = "id", required = false)
private Long id;
@JsonProperty(value = "text", required = true)
private String label;
@JsonProperty(value = "answers", required = true)
@Valid
private List<AnswerJson> answers;
}
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