java - 返回错误列表

Question

我想使用此 Response 对象返回错误列表:

public class StringResponseDTO {

    private String response;

    public StringResponseDTO(String response) {
        super();
        this.response = response;
    }

    public String getResponse() {
        return response;
    }

    public void setResponse(String response) {
        this.response = response;
    }
}

我使用此代码生成错误:

List<FieldError> errors = result.getFieldErrors();
        for (FieldError error : errors ) {
          System.out.println ("Validation error in field: " + error.getObjectName() 
                          + "! Validation error message: " + error.getDefaultMessage() 
                          + "! Rejected value:" + error.getRejectedValue());
          return ResponseEntity.ok(new StringResponseDTO(error.getField() + " " + error.getDefaultMessage()));
        }

我想返回这样的列表:

response: {
   errors: [
      field_name: message,
      second_name: second_message
           ]
}

你知道我该如何修改代码吗？也许我需要添加构造函数？

Answer 1

response: {
   errors: [
      field_name: message,
      second_name: second_message
           ]
}

您需要使用以下类来对上述 json 进行建模:

@JsonTypeInfo(include = JsonTypeInfo.As.WRAPPER_OBJECT, use = JsonTypeInfo.Id.NAME)
@JsonTypeName("response")
class StringResponseDTO {

    private List<String> errors;

    public StringResponseDTO(final List<String> errors) {
        this.errors = errors;
    }

    public List<String> getErrors() {
        return errors;
    }

    public void setErrors(final List<String> errors) {
        this.errors = errors;
    }
}

您可以将响应构造为:

List<String> errorsList = new ArrayList<>();
List<FieldError> errors = result.getFieldErrors();
for (FieldError error : errors ) {
     System.out.println ("Validation error in field: " + error.getObjectName() 
                     + "! Validation error message: " + error.getDefaultMessage() 
                     + "! Rejected value:" + error.getRejectedValue());
          errorsList.add(error.getField() + " " + error.getDefaultMessage());
}

return ResponseEntity.badRequest().body(new StringResponseDTO(errorsList));