为了在读取 用户 表中的 mobile 字段时进行脱敏处理，并实现一个通用的方法以便将来对其他字段例如：邮箱、身份证、姓名等进行脱敏处理，可以采用以下步骤：
1. 添加依赖
首先，在 pom.xml 文件中添加必要的依赖，包括 Spring Boot、MyBatis-Plus 和 Hutool 工具库：
<dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.5.2</version> </dependency> <dependency> <groupId>cn.hutool</groupId> <artifactId>hutool-all</artifactId> <version>5.8.16</version> </dependency></dependencies>2. 创建脱敏注解
定义一个自定义注解 @Sensitive，用于标识需要脱敏的字段：
package com.example.demo.annotation;import java.lang.annotation.*;@Retention(RetentionPolicy.RUNTIME)@Target(ElementType.FIELD)@Documentedpublic @interface Sensitive { SensitiveType type();}enum SensitiveType { MOBILE, EMAIL, ID_CARD}3. 创建脱敏拦截器
实现一个通用的脱敏拦截器 DesensitizationInterceptor，用于处理不同类型的脱敏逻辑：
package com.example.demo.handler;package com.central.db.sensitive;import cn.hutool.core.util.DesensitizedUtil;import lombok.extern.slf4j.Slf4j;import org.apache.ibatis.executor.resultset.ResultSetHandler;import org.apache.ibatis.plugin.Interceptor;import org.apache.ibatis.plugin.Intercepts;import org.apache.ibatis.plugin.Invocation;import org.apache.ibatis.plugin.Signature;import java.lang.reflect.Field;import java.sql.Statement;import java.util.List;@Slf4j@Intercepts({@Signature(type = ResultSetHandler.class, method = "handleResultSets", args = {Statement.class})})public class DesensitizationInterceptor implements Interceptor { @Override public Object intercept(Invocation invocation) throws Throwable { Object result = invocation.proceed(); if (result instanceof List) { for (Object obj : (List) result) { desensitize(obj); } } else { desensitize(result); } return result; } private void desensitize(Object obj) { if (obj == null) { return; } Field[] fields = obj.getClass().getDeclaredFields(); for (Field field : fields) { if (field.isAnnotationPresent(Sensitive.class)) { Sensitive sensitive = field.getAnnotation(Sensitive.class); field.setAccessible(true); try { String value = (String) field.get(obj); if (value != null) { field.set(obj, desensitizeValue(value, sensitive.type())); } } catch (IllegalAccessException e) { e.printStackTrace(); } } } } private String desensitizeValue(String value, SensitiveType type) { switch (type) { case MOBILE: return DesensitizedUtil.mobilePhone(value); case EMAIL: return DesensitizedUtil.email(value); case ID_CARD: return DesensitizedUtil.idCardNum(value, 1, 2); default: return value; } }}4. 配置 MyBatis-Plus
在 MyBatis-Plus 配置中注册自定义的类型处理器：
package com.example.demo.config;import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;import com.example.demo.annotation.SensitiveType;import com.example.demo.handler.SensitiveTypeHandler;import org.apache.ibatis.session.SqlSessionFactory;import org.mybatis.spring.SqlSessionFactoryBean;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;@Configurationpublic class MyBatisPlusConfig { @Bean public Interceptor desensitizationInterceptor() { return new DesensitizationInterceptor(); } }5. 修改实体类
在 Employee 实体类中使用自定义注解标识需要脱敏的字段：
package com.example.demo.entity;import com.baomidou.mybatisplus.annotation.TableId;import com.baomidou.mybatisplus.annotation.TableName;import com.example.demo.annotation.Sensitive;import com.example.demo.annotation.SensitiveType;import lombok.Data;@Data@TableName("employee")public class Employee { @TableId private Long id; @Sensitive(type = SensitiveType.MOBILE) private String mobile; }6. 测试
编写测试代码，验证脱敏功能是否正常工作：
package com.example.demo;import com.example.demo.entity.Employee;import com.example.demo.mapper.EmployeeMapper;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.boot.CommandLineRunner;import org.springframework.stereotype.Component;@Componentpublic class TestRunner implements CommandLineRunner { @Autowired private EmployeeMapper employeeMapper; @Override public void run(String... args) throws Exception { Employee employee = employeeMapper.selectById(1L); System.out.println("脱敏后的手机号: " + employee.getMobile()); }}通过以上步骤，你可以实现一个通用的数据脱敏方法，适用于不同字段和表的关键字段。这样可以有效保护敏感数据，确保数据隐私和安全。
