1、前言

     当前互联网中，越来越重视数据安全，数据脱敏在实际应用中越来越多。

2 、脱敏方式

  2.1 数据库sql 语句脱敏

    sql 语句脱敏是比较传统通用的，例子如下所示：

select CONCAT(LETF(mobile,3),"*****",RIGHT(mobile,3))  from tb_user

2.2 通过Java 代码脱敏

    代码脱敏一般要通过aop以及自定义注解实现，代码如下。

package com.example.demo.annotion;

import java.lang.annotation.*;

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface DesensitizationWord {



}

package com.example.demo.annotion;

import java.lang.annotation.*;

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface DesensitizationWord {



}

@Aspect
@Component
@Slf4j
public class DesensitizationgWordAspect {

    @Pointcut(value = "@annotation(com.example.demo.annotion.DesensitizationWord)")
    public void desensitizationgWordFlag() {
    }
    @AfterReturning(value = "desensitizationgWordFlag()",returning = "result")
    public void afterReturning(JoinPoint joinPoint, Object result) throws IllegalAccessException {
        if(result instanceof Base){
            Base base  = (Base)result;
            List<?> list = base.getData();
            if(CollectionUtils.isEmpty(list)) return;
            for(Object objcet:list){
                Field[]  fields = objcet.getClass().getDeclaredFields();
                for(Field field:fields){
                    Annotation[]  annotations = field.getAnnotations();
                    if(annotations!=null && annotations.length>0){
                        for (Annotation annotation:annotations ){
                            field.setAccessible(true);
                            if(annotation instanceof Mobile){
                                Object  mobile = field.get(objcet);
                                if(mobile instanceof String){
                                    String mobileString= (String)mobile;
                                    field.set(objcet,desensitizedPhoneNumber(mobileString));
                                }
                            }
                        }
                    }
                }
            }

        }

    }
    public  String desensitizedPhoneNumber(String phoneNumber) {
        if (StringUtils.isNotBlank(phoneNumber)) {
            phoneNumber = phoneNumber.replaceAll("(\\w{3})\\w*(\\w{3})", "$1*****$2");
        }
        return phoneNumber;
    }
}

2.3 、通过mybatis-mate-sensitive-jackson 

    这个是mybaitsplus  的功能，其实实现的原理和2.2的的方法类型，只是它封装成jar包，并且支持扩展。 怎么使用大家可以参考企业高级特性 | MyBatis-Plus，它目前支持如下脱敏规则如

package mybatis.mate.strategy;
 
public interface SensitiveType {
    String chineseName = "chineseName";
    String idCard = "idCard";
    String phone = "phone";
    String mobile = "mobile";
    String address = "address";
    String email = "email";
    String bankCard = "bankCard";
    String password = "password";
    String carNumber = "carNumber";
}

在使用脱敏规则字段上新增注解 ，如下代码

@FieldSensitive("chineseName ")
private String username;

还可以自定义脱敏规则，如下代码

@Configuration
public class SensitiveStrategyConfig {

    /**
     * 注入脱敏策略
     */
    @Bean
    public ISensitiveStrategy sensitiveStrategy() {
        // 自定义 testStrategy 类型脱敏处理
        return new SensitiveStrategy().addStrategy("testStrategy", t -> t + "***test***");
    }
}