自定义一个Jackson注解实现数据脱敏

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/**
 * 自定义jackson注解，标注在属性上
 */
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
@JacksonAnnotationsInside
@JsonSerialize(using = SensitiveJsonSerializer.class)
public @interface Sensitive {
    //脱敏策略
    SensitiveStrategy strategy();
}

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/**
 * 脱敏策略，枚举类，针对不同的数据定制特定的策略
 */
public enum SensitiveStrategy {
    /**
     * 用户名
     */
    USERNAME(s -> s.replaceAll("(\S)\S(\S*)", "$1*$2")),
    /**
     * 身份证
     */
    ID_CARD(s -> s.replaceAll("(\d{4})\d{10}(\w{4})", "$1****$2")),
    /**
     * 手机号
     */
    PHONE(s -> s.replaceAll("(\d{3})\d{4}(\d{4})", "$1****$2")),
    /**
     * 地址
     */
    ADDRESS(s -> s.replaceAll("(\S{3})\S{2}(\S*)\S{2}", "$1****$2****"));


    private final Function<String, String> desensitizer;

    SensitiveStrategy(Function<String, String> desensitizer) {
        this.desensitizer = desensitizer;
    }

    public Function<String, String> desensitizer() {
        return desensitizer;
    }
}
以上只是提供了部分，具体根据自己项目要求进行配置。

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/**
 * 序列化注解自定义实现
 * JsonSerializer<String>：指定String 类型，serialize()方法用于将修改后的数据载入
 */
public class SensitiveJsonSerializer extends JsonSerializer<String> implements ContextualSerializer {
    private SensitiveStrategy strategy;

    @Override
    public void serialize(String value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
        gen.writeString(strategy.desensitizer().apply(value));
    }

    /**
     * 获取属性上的注解属性
     */
    @Override
    public JsonSerializer<?> createContextual(SerializerProvider prov, BeanProperty property) throws JsonMappingException {

        Sensitive annotation = property.getAnnotation(Sensitive.class);
        if (Objects.nonNull(annotation)&&Objects.equals(String.class, property.getType().getRawClass())) {
            this.strategy = annotation.strategy();
            return this;
        }
        return prov.findValueSerializer(property.getType(), property);

    }
}

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@Data
public class Person {
    /**
     * 真实姓名
     */
    @Sensitive(strategy = SensitiveStrategy.USERNAME)
    private String realName;
    /**
     * 地址
     */
    @Sensitive(strategy = SensitiveStrategy.ADDRESS)
    private String address;
    /**
     * 电话号码
     */
    @Sensitive(strategy = SensitiveStrategy.PHONE)
    private String phoneNumber;
    /**
     * 身份证号码
     */
    @Sensitive(strategy = SensitiveStrategy.ID_CARD)
    private String idCard;
}

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@RestController
public class TestController {
    @GetMapping("/test")
    public Person test(){
        Person user = new Person();
        user.setRealName("天天工作");
        user.setPhoneNumber("19796328206");
        user.setAddress("浙江省杭州市....");
        user.setIdCard("4333333333334334333");
        return user;
    }
}

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{
    "realName": "天*工作",
    "address": "浙江省****市..****",
    "phoneNumber": "197****8206",
    "idCard": "4333****34333"
}