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README
Apache-2.0

mei-fluent-demo

使用fluent-validator来做验证,进一步对fluent做扩展。

1.为什么要扩展

bean 后台校验领域hibernate validator已经比较优秀了。 fluent-validator是集成了hibernate validator的验证基础上,加入fluent的校验。 其实fluent validator的优势在于非spring坏境下的流式调用api,但是 @FluentValidate({xx.class})的方式和Hibernate validator的自定义注解实现的功能 类似。都不是业务场景的数据校验,是最基础的bean的单一属性的数据格式校验。

业务场景的校验,例如:bean中的一个属性依赖于另一个属性的值而做不同校验的情况。 像,是否需要提供电话号码,如果需要,则提供的电话号码不能为空。

最近在做一工作,对bean中的数据校验,有很多业务场景存在。如此,仅仅是hibernate或者 fluent中的校验,是满足不了需求,这才自己进行简单扩展了。

1.1.对hibernate validator做的常用扩展

  • @Dict 数据字典单选
  • @DictMulti 数据字典多选
  • Url 网址

1.2.对fluent validator做的常用扩展

  • IdcardValidator 身份证
  • PhoneValidator 手机号码
  • UrlValidator 网址(无法通用自定义message信息,略坑)
  • ZipCodeValidator 邮政编码

2.为什么后台做数据校验,还要加入业务场景校验

一般的网站,为了安全性,都是浏览器端和服务器端都做校验的。服务器端校验,能够过滤别人 不是用网站界面输入的数据,减少垃圾数据到数据库中。 而业务场景的校验,是进一步的加强了数据的正确性,提高数据质量的有效手段。

3.有哪些常见的业务场景

这里我就说说我遇到的

  • A对象中的A2属性依赖A1属性,A1=1的时候,A2不能为空
  • A对象中的list A2属性依赖A1属性,A1=1的时候,A2中的每个B对象的B1的值都得是1

4.解决思路

自定义@Refer注解实现业务场景的数据校验。结合了fluent validator和hibernate validator 2者的优点。

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
public @interface Refer {
    String[] param();//条件验证参数
    String[] validparam() default {};//要验证的值验证参数,未配置则默认是注解上的属性值
    Class<?> validator();//验证器
    String message() default "";
    Class<?>[] groups() default {};//分组

}

使用:

@Refer(validator = AOneBNotNullValidator.class,
        groups = {G1.class},
        param = {"org.mango.bean.C:c1=110"},
        message = "c2的值在c1=110,才不能为空")
private String c2;

验证器:

/**
 * @param param 条件参数
 * @param validparam 验证参数
 * @param vc 验证上下文
 * @param msg 错误信息
 * @return
 */
@Override
public boolean validate(Map<String, Object> param, Map<String, Object> validparam, ValidContext vc, String msg) {
    String bb = this.getString(param,this.getFirstKey(param));
    String eqValue = this.getString(param,this.getFirstKey(param)+"_eqValue");
    if(null != bb){
        String field = this.getFirstKey(validparam);
        String str = this.getString(validparam, field);
        if(bb.equals(eqValue)) {
            if (null != str && str.length()>0) {
                return true;
            } else {
                vc.addError(field, msg);
                return false;
            }
        }else{
            return true;
        }
    }
    return true;
}

验证测试:

public static void main(String[] args){
    C aObj = new C();
    aObj.setA0(1);
    aObj.setA1("test");
    aObj.setA2("");
    B b = new B();
    b.setB1("mango");
    b.setB3("xxx");
    aObj.setB(b);
    try {
        List<String> msgList = ValidUtil.validateAll(aObj,true);
        System.out.println(JSONObject.toJSONString(msgList));
    } catch (Exception e) {
        e.printStackTrace();
    }
}

5.更多验证方法

more 在 ValidUtil.java

6.@Refer中解决的难点

  • param = {"org.mango.bean.C:c1=110"} 参数传递设计,灵活能传递多个参数,可以实现if(a1 == 1 && b1== 1){c1 and c2不为空}的业务场景。
  • 基于@Valid注解,实现属性List或者对象的递归解析。
  • 基于class.getSupperClass()方法,获取extends的父类属性校验。
  • org.mango.bean.C:c1=110,C类不是当前类,使用对象的局部线程安全map来存储bean的对象属性,实现跨bean的属性依赖。
  • @Valid 给到一个List的属性上时,不存储到局部线程安全map中,因为跨bean的依赖无法指定list中的某个对象。
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简介

使用fluent-validator来做验证。fluent-validator 集成 hibernate-validator和fluent的自定义注解。在无法实现业务场景的时候,自定义@Refer注解实现。 展开 收起
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