一 BindException 当请求主体验证失败时抛出。你可以自己定义 ControllerAdvice 从中的详细信息构造适当的错误消息 BindException .

import java.util.ArrayList;
import java.util.List;

import org.springframework.http.HttpStatus;
import org.springframework.validation.BindException;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.ResponseStatus;

import com.example.demo.ErrorResponse.ErrorDetails;

@ControllerAdvice
public class CustomExceptionHandler {

    @ExceptionHandler(BindException.class)
    @ResponseStatus(HttpStatus.BAD_REQUEST)
    @ResponseBody
    public ErrorResponse handleException(BindException ex) {

        List<FieldError> errors = ex.getBindingResult().getFieldErrors();

        List<ErrorDetails> errorDetails = new ArrayList<>();
        for (FieldError fieldError : errors) {
            ErrorDetails error = new ErrorDetails();
            error.setFieldName(fieldError.getField());
            error.setMessage(fieldError.getDefaultMessage());
            errorDetails.add(error);
        }

        ErrorResponse errorResponse = new ErrorResponse();
        errorResponse.setErrors(errorDetails);

        return errorResponse;
    }

}

错误响应的pojo:

@Data
public class ErrorResponse {

    private List<ErrorDetails> errors;

    @Data
    public static class ErrorDetails {
        private String fieldName;
        private String message;
    }
}

错误消息示例

{
    "errors": [
        {
            "fieldName": "firstName",
            "message": "must not be null"
        },
        {
            "fieldName": "lastName",
            "message": "must not be null"
        }
    ]
}