Jersey bean验证-返回错误请求的验证消息

Question

对于错误的响应，是否可能在响应中返回验证注释消息？我认为这是可能的，但我注意到我们的项目没有给出详细的不良请求信息。

@NotNull(message="idField is required")
@Size(min = 1, max = 15) 
private String idField;

如果请求缺少IDField，我希望返回“IDField is required”。我用的是泽西2.0。我看到的回应是...

{
  "timestamp": 1490216419752,
  "status": 400,
  "error": "Bad Request",
  "message": "Bad Request",
  "path": "/api/test"
}

Answer 1

看起来您的Bean验证异常（ConstraintViolationException）是由您的一个ExceptionMapper翻译的。您可以为ConstraintViolationException注册ExceptionMapper，如下所示，并以所需格式返回数据。ConstraintViolationException具有要查找的所有信息。

@Singleton
@Provider
public class ConstraintViolationMapper implements ExceptionMapper<ConstraintViolationException> {

  @Override
  public Response toResponse(ConstraintViolationException e) {
    // There can be multiple constraint Violations
    Set<ConstraintViolation<?>> violations = e.getConstraintViolations();
    List<String> messages = new ArrayList<>();
    for (ConstraintViolation<?> violation : violations) {
        messages.add(violation.getMessage()); // this is the message you are actually looking for

    }
    return Response.status(Status.BAD_REQUEST).entity(messages).build();
  }

}