本文是Spring架构下,Validator验证请求参数是否合法
导入依赖如下:
<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
<version>1.1.0.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>5.4.0.Final</version>
</dependency>
实体类注解
package com.aekc.mmall.param;
import org.hibernate.validator.constraints.Email;
import org.hibernate.validator.constraints.Length;
import org.hibernate.validator.constraints.NotBlank;
import javax.validation.constraints.Max;
import javax.validation.constraints.Min;
import javax.validation.constraints.NotNull;
public class User {
private Integer id;
@NotBlank(message = "用户名不能为空")
@Length(min = 1, max = 20, message = "用户名长度")
private String username;
@NotBlank(message = "电话不可以为空")
@Length(min = 1, max = 13, message = "电话长度需要在13个字符以内")
private String telephone;
@Email
@NotBlank(message = "邮箱不能为空")
private String mail;
@NotNull(message = "必须指定用户状态")
@Min(value = 0, message = "用户状态不合法")
@Max(value = 1, message = "用户状态不合法")
private Integer status;
}
重点工具类:
package com.aekc.mmall.utils;
import com.aekc.mmall.exception.ParamException;
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.*;
public class ParamValidatorUtil {
/*工厂模式,目的获取SpringBean*/
private static ValidatorFactory validatorFactory = Validation.buildDefaultValidatorFactory();
public static <T> Map<String, String> validate(T t, Class... groups) {
Validator validator = validatorFactory.getValidator();
/*获取指定类的SpringBean*/
/*验证参数是否符合要求*/
Set validateResult = validator.validate(t, groups);
if(validateResult.isEmpty()) {
return Collections.emptyMap();
}else {
LinkedHashMap errors = Maps.newLinkedHashMap();
/*遍历*/
Iterator iterator = validateResult.iterator();
while(iterator.hasNext()) {
ConstraintViolation violation = (ConstraintViolation) iterator.next();
errors.put(violation.getPropertyPath().toString(), violation.getMessage());
}
return errors;
}
}
/*验证的是集合*/
public static Map<String, String> 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;
}
/*统一入口*/
public static Map<String, String> validateObject(Object first, Object... objects) {
if(objects != null && objects.length > 0) {
return validateList(Lists.asList(first, objects));
}else {
return validate(first, new Class[0]);
}
}
/**
* 把需要检测的bean引用该方法即可
* @param param VO
* @throws ParamException
*/
public static void check(Object param) throws ParamException {
Map<String, String> map = ParamValidatorUtil .validateObject(param);
// 如果并不为空说明有错误信息
if(MapUtils.isNotEmpty(map)) {
// 异常处理
}
}
}
Controller验证
@RequestMapping("/test")
public ResultJson test(User user ) {
/*设置user的属性,验证*/
BeanValidator.check(user);
}
下一篇:SpringBoot 中集成Validator