springboot 结合jackson数据脱敏

　　在返回字段时有时需要对电话，地址等字段进行脱敏处理

　　1. 定义枚举脱敏类

　　使用函数编程，绑定函数操作

public enum DataMaskEnum {
    /**
     *  名称脱敏
     */
    USERNAME(s->s.replaceAll("(\\S)\\S(\\S*)","$1*$2")),

    /**
     * 手机号脱敏
     */
    PHONE(s->s.replaceAll("(\\d{3})\\d{4}(\\d{4})","$1****$2")),

    /**
     * 地址脱敏
     */
    ADDRESS(s->s.replaceAll("(\\S{3})\\S{2}(\\S*)\\S{2}","$1****$2****"))
    ;

    private Function<String,String> function;

    DataMaskEnum(Function<String, String> function) {
        this.function = function;
    }

    public Function<String,String> function(){
        return this.function;
    }
}

　　2. 定义脱敏注解

@Target({ElementType.FIELD,ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@JacksonAnnotationsInside
@JsonSerialize(using = DataMaskingSerializer.class)
public @interface DataMask {

    DataMaskEnum function() default DataMaskEnum.ADDRESS;
}

　　3. 结合jackson脱敏处理

public final class DataMaskingSerializer extends JsonSerializer<String> implements ContextualSerializer {

    private DataMaskEnum dataMaskEnum;

    @Override
    public void serialize(String s, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException {
        jsonGenerator.writeString(dataMaskEnum.function().apply(s));
    }

    @Override
    public JsonSerializer<?> createContextual(SerializerProvider serializerProvider, BeanProperty beanProperty) throws JsonMappingException {

        DataMask annotation = beanProperty.getAnnotation(DataMask.class);
        if (annotation != null && String.class.equals(beanProperty.getType().getRawClass())){
            dataMaskEnum = annotation.function();
            return this;
        }

        return serializerProvider.findValueSerializer(beanProperty.getType(),beanProperty);
    }
}

　　4. 在实体类上添加注解，请求接口

@Data
public class PrjAssignDetailVO {

    @Schema(description ="客户联系电话")
    @DataMask(function = DataMaskEnum.PHONE)
    private String contactPhone;
}

    @GetMapping("/test/{id}")
    public R test(@PathVariable("id") String id){
        PrjAssign one = prjAssignService.lambdaQuery().eq(PrjAssign::getId, id).one();
        PrjAssignDetailVO prjAssignDetailVO = new PrjAssignDetailVO();
        BeanUtil.copyProperties(one, prjAssignDetailVO);
        return R.ok(prjAssignDetailVO);
    }