校验工具-BeanValidator开发
package com.mmall.util;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;
import javax.validation.ConstraintViolation;
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.ValidatorFactory;
import org.apache.commons.collections.MapUtils;
import com.google.common.base.Preconditions;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.mmall.exception.ParamException;
public class BeanValidator {
//全局校验工厂
private static ValidatorFactory validatorFactory = Validation.buildDefaultValidatorFactory();
//传入对象
//key=字段 value=错误信息
public static <T> Map<String, String> validate(T t, Class... groups) {
Validator validator = validatorFactory.getValidator();
Set validateResult = validator.validate(t, groups);
if (validateResult.isEmpty()) {
return Collections.emptyMap();//若没有错误信息，返回空的Map
} else {
LinkedHashMap errors = Maps.newLinkedHashMap();//创建HashMap
Iterator iterator = validateResult.iterator();
while (iterator.hasNext()) {
ConstraintViolation violation = (ConstraintViolation)iterator.next();
errors.put(violation.getPropertyPath().toString(), violation.getMessage());//key 是字段 value 是错误信息
}
return errors;
}
}
//传入集合
public static Map<String, String> validateList(Collection<?> collection) {
//collection为null 抛出NullPointerException 若不为空 返回该集合
Preconditions.checkNotNull(collection);
Iterator iterator = collection.iterator();
Map errors;
do {
if (!iterator.hasNext()) {
return Collections.emptyMap();//若集合中没有数据 返回空的Map
}
Object object = iterator.next();
errors = validate(object, new Class[0]);//调用前面的方法
} while (errors.isEmpty());
return errors;
}
public static Map<String, String> validateObject(Object first, Object... objects) {
if (objects != null && objects.length > 0) {
return validateList(Lists.asList(first, objects));//将数组转集合传入
} else {
return validate(first, new Class[0]);
}
}
//出现异常时 抛出
public static void check(Object param) throws ParamException {
Map<String, String> map = BeanValidator.validateObject(param);
if (MapUtils.isNotEmpty(map)) {// !=null && size > 0
throw new ParamException(map.toString());
}
}
}