springboot 結合jackson資料脫敏

　　在返回欄位時有時需要對電話，地址等欄位進行脫敏處理

　　1. 定義列舉脫敏類

　　使用函式程式設計，繫結函式操作

public enum DataMaskEnum {
    /**
     *  名稱脫敏
     */
    USERNAME(s->s.replaceAll("(\\S)\\S(\\S*)","$1*$2")),

    /**
     * 手機號脫敏
     */
    PHONE(s->s.replaceAll("(\\d{3})\\d{4}(\\d{4})","$1****$2")),

    /**
     * 地址脫敏
     */
    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. 定義脫敏註解

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

    DataMaskEnum function() default DataMaskEnum.ADDRESS;
}

　　3. 結合jackson脫敏處理

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. 在實體類上新增註解，請求介面

@Data
public class PrjAssignDetailVO {

    @Schema(description ="客戶聯絡電話")
    @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);
    }