JSR303校验工具类

public enum ValidatorUtil {
    instance;
    public static final Validator validator = Validation.buildDefaultValidatorFactory().getValidator();

    public void valid(Object o, Class group) throws IllegalArgumentException {
        Set<ConstraintViolation<Object>> validate = validator.validate(o, group);
        if (validate.size() > 0) {
            String msg = msgPrettyFormat(validate);
            throw new IllegalArgumentException(msg);
        }
    }

    public void valid(Object o) throws IllegalArgumentException {
        Set<ConstraintViolation<Object>> validate = validator.validate(o);
        if (validate.size() > 0) {
            String msg = msgPrettyFormat(validate);
            throw new IllegalArgumentException(msg);
        }
    }

    private String msgPrettyFormat(Set<ConstraintViolation<Object>> validate) {
        StringBuilder stringBuilder = new StringBuilder();
        for (ConstraintViolation<Object> constraintViolation : validate) {
            stringBuilder
                    .append("[")
                    .append(constraintViolation.getPropertyPath())
                    .append("=")
                    .append(constraintViolation.getInvalidValue())
                    .append(" -> ")
                    .append(constraintViolation.getMessage())
                    .append("] ");
        }
        return stringBuilder.toString();
    }

}