java开发validate方法中校验工具类详解

import lombok.experimental.UtilityClass;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.lang3.StringUtils;
import org.hibernate.validator.HibernateValidator;
import javax.validation.ConstraintViolation;
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.ValidatorFactory;
import java.util.List;
import java.util.Set;
/**
 * validate方法中校验工具类
 * <p>
 * 只要在实体中加上相应的validate的相关注解即可
 * </p>
 *
 * @author Zed
 */
@UtilityClass
public class ValidateTools {
    /**
     * 初始化检查器
     */
    private static final ValidatorFactory VALIDATOR_FACTORY = Validation.byProvider(HibernateValidator.class).configure().failFast(false).buildValidatorFactory();
    private static final Validator VALIDATOR = VALIDATOR_FACTORY.getValidator();
    /**
     * 校验返回异常信息
     *
     * @param t   实体
     * @param <T> 实体泛型
     */
    public static <T> String validStr(T t) {
        // 构造返回信息
        StringBuilder validMessage = new StringBuilder();
        // 检查实体T
        Set<ConstraintViolation<T>> set = VALIDATOR.validate(t);
        // 循环set，获取检查结果
        for (ConstraintViolation<T> vo : set) {
            validMessage.append(vo.getMessage()).append(";");
        }
        return validMessage.toString();
    }
    /**
     * 校验实体抛出异常
     *
     * @param t   实体
     * @param <T> 实体泛型
     */
    public static <T> void valid(T t) {
        String validStr = validStr(t);
        // 抛出业务异常
        if (StringUtils.isNotBlank(validStr)) {
            throw new BusinessException(validStr);
        }
    }
    /**
     * 校验集合抛出异常
     *
     * @param list 列表
     * @param <T>  实体泛型
     */
    public static <T> void valid(List<T> list) {
        if (CollectionUtils.isEmpty(list)) {
            throw new BusinessException("数据不存在！");
        }
        // 构造返回信息
        StringBuilder validMessageTotal = new StringBuilder();
        // 遍历
        for (int i = 0; i < list.size(); i++) {
            String validStr = validStr(list.get(i));
            if (StringUtils.isNotBlank(validStr)) {
                String msg = String.format("第%d条数据校验结果:[%s]\n", i + 1, validStr);
                validMessageTotal.append(msg);
            }
        }
        // 抛出业务异常
        if (StringUtils.isNotBlank(validMessageTotal.toString())) {
            throw new BusinessException(validMessageTotal.toString());
        }
    }
}