参数校验工具类BeanValidator

1、pom依赖

    org.apache.commons
    commons-lang3
    3.5


    com.google.code.findbugs
    jsr305
    3.0.2




    javax.validation
    validation-api
    1.1.0.Final


    org.hibernate
    hibernate-validator
    5.2.4.Final




    commons-collections
    commons-collections
    3.2.2



    com.google.guava
    guava
    15.0

2、参数校验工具类：BeanValidator

import com.google.common.base.Preconditions;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import org.apache.commons.collections.MapUtils;
import javax.validation.ConstraintViolation;
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.ValidatorFactory;
import java.util.*;


/**
 * 参数校验工具类
 *
 */
public class BeanValidator {
    private static ValidatorFactory validatorFactory = Validation.buildDefaultValidatorFactory();

    /**
     * 校验单个对象
     *
     * @param t
     * @param groups
     * @param 
     * @return
     */
    public static  Map validate(T t, Class... groups) {
        Validator validator = validatorFactory.getValidator();
        Set validateResult = validator.validate(t, groups);
        if (validateResult.isEmpty()) {
            return Collections.emptyMap();
        } else {
            LinkedHashMap errors = Maps.newLinkedHashMap();
            Iterator iterator = validateResult.iterator();
            while (iterator.hasNext()) {
                ConstraintViolation violation = (ConstraintViolation)iterator.next();
                errors.put(violation.getPropertyPath().toString(), violation.getMessage());
            }
            return errors;
        }
    }

    /**
     * 校验对象列表
     *
     * @param collection
     * @return
     */
    public static Map validateList(Collection collection) {
        Preconditions.checkNotNull(collection);
        Iterator iterator = collection.iterator();
        Map errors;
        do {
            if (!iterator.hasNext()) {
                return Collections.emptyMap();
            }
            Object object = iterator.next();
            errors = validate(object, new Class[0]);
        } while (errors.isEmpty());

        return errors;
    }

    /**
     * 检验单个对象或者列表
     *
     * @param first
     * @param objects
     * @return
     */
    public static Map validateObject(Object first, Object... objects) {
        if (objects != null && objects.length > 0) {
            return validateList(Lists.asList(first, objects));
        } else {
            return validate(first, new Class[0]);
        }
    }

    /**
     * 通用参数校验
     *
     * @param param
     * @throws ParamException
     */
    public static void paramCheck(Object param) throws ParamException {
        Map map = BeanValidator.validateObject(param);
        if (MapUtils.isNotEmpty(map)) {
            throw new ParamException(map.toString());
        }
    }
}

3、异常类：ParamException

import javax.annotation.Nullable;

/**
 * 参数校验异常
 *
 */
public class ParamException extends BaseException{
    public ParamException(String message) {
        super(message);
    }

    public ParamException(String message, Throwable cause) {
        super(message, cause);
    }

    public ParamException(ErrorCode errorCode) {
        super(errorCode);
    }

    public ParamException(ErrorCode errorCode, @Nullable Object... messageArgs) {
        super(errorCode, messageArgs);
    }

    public ParamException(ErrorCode errorCode, @Nullable Throwable cause, @Nullable Object... messageArgs) {
        super(errorCode, cause, messageArgs);
    }
}