import lombok.Getter;

/**
 * 隱私數(shù)據(jù)類(lèi)型枚舉
 */
@Getter
public enum PrivacyTypeEnum {

  /** 自定義（此項(xiàng)需設(shè)置脫敏的范圍）*/
  CUSTOMER,

  /** 姓名 */
  NAME,

  /** 身份證號(hào) */
  ID_CARD,

  /** 手機(jī)號(hào) */
  PHONE,

  /** 郵箱 */
  EMAIL,
}

import com.fasterxml.jackson.annotation.JacksonAnnotationsInside;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * 自定義數(shù)據(jù)脫敏注解
 */
@Target(ElementType.FIELD) // 作用在字段上
@Retention(RetentionPolicy.RUNTIME) // class文件中保留，運(yùn)行時(shí)也保留，能通過(guò)反射讀取到
@JacksonAnnotationsInside // 表示自定義自己的注解PrivacyEncrypt
@JsonSerialize(using = PrivacySerializer.class) // 該注解使用序列化的方式
public @interface PrivacyEncrypt {

    /**
     * 脫敏數(shù)據(jù)類(lèi)型（沒(méi)給默認(rèn)值，所以使用時(shí)必須指定type）
     */
    PrivacyTypeEnum type();

    /**
     * 前置不需要打碼的長(zhǎng)度
     */
    int prefixNoMaskLen() default 1;

    /**
     * 后置不需要打碼的長(zhǎng)度
     */
    int suffixNoMaskLen() default 1;

    /**
     * 用什么打碼
     */
    String symbol() default "*";
}

import cn.hutool.core.util.StrUtil;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.BeanProperty;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.ser.ContextualSerializer;
import lombok.AllArgsConstructor;
import lombok.NoArgsConstructor;

import java.io.IOException;
import java.util.Objects;

@NoArgsConstructor
@AllArgsConstructor
public class PrivacySerializer extends JsonSerializer<String> implements ContextualSerializer {

    // 脫敏類(lèi)型
    private PrivacyTypeEnum privacyTypeEnum;
    // 前幾位不脫敏
    private Integer prefixNoMaskLen;
    // 最后幾位不脫敏
    private Integer suffixNoMaskLen;
    // 用什么打碼
    private String symbol;

    @Override
    public void serialize(String origin, final JsonGenerator jsonGenerator,
                          final SerializerProvider serializerProvider) throws IOException {
        if (StrUtil.isEmpty(origin)) {
            origin = null;
        }
        if (null != privacyTypeEnum) {
            switch (privacyTypeEnum) {
                case CUSTOMER:
                    jsonGenerator.writeString(PrivacyUtil.desValue(origin, prefixNoMaskLen, suffixNoMaskLen, symbol));
                    break;
                case NAME:
                    jsonGenerator.writeString(PrivacyUtil.hideChineseName(origin));
                    break;
                case ID_CARD:
                    jsonGenerator.writeString(PrivacyUtil.hideIDCard(origin));
                    break;
                case PHONE:
                    jsonGenerator.writeString(PrivacyUtil.hidePhone(origin));
                    break;
                case EMAIL:
                    jsonGenerator.writeString(PrivacyUtil.hideEmail(origin));
                    break;
                default:
                    throw new IllegalArgumentException("unknown privacy type enum " + privacyTypeEnum);
            }
        }
    }

    @Override
    public JsonSerializer<?> createContextual(final SerializerProvider serializerProvider,
                                              final BeanProperty beanProperty) throws JsonMappingException {
        if (null != beanProperty) {
            if (Objects.equals(beanProperty.getType().getRawClass(), String.class)) {
                PrivacyEncrypt privacyEncrypt = beanProperty.getAnnotation(PrivacyEncrypt.class);
                if (null == privacyEncrypt) {
                    privacyEncrypt = beanProperty.getContextAnnotation(PrivacyEncrypt.class);
                }
                if (null != privacyEncrypt) {
                    return new PrivacySerializer(privacyEncrypt.type(), privacyEncrypt.prefixNoMaskLen(),
                            privacyEncrypt.suffixNoMaskLen(), privacyEncrypt.symbol());
                }
            }
            return serializerProvider.findValueSerializer(beanProperty.getType(), beanProperty);
        }
        return serializerProvider.findNullValueSerializer(null);
    }

}

public class PrivacyUtil {

    /**
     * 中文名脫敏
     */
    public static String hideChineseName(String chineseName) {
        if (StrUtil.isEmpty(chineseName)) {
            return null;
        }
        if (chineseName.length() <= 2) {
            return desValue(chineseName, 1, 0, "*");
        }
        return desValue(chineseName, 1, 1, "*");
    }

    /**
     * 手機(jī)號(hào)脫敏
     */
    public static String hidePhone(String phone) {
        if (StrUtil.isEmpty(phone)) {
            return null;
        }
        return phone.replaceAll("(\\d{3})\\d{4}(\\d{4})", "$1****$2"); // 隱藏中間4位
//        return desValue(phone, 3, 4, "*"); // 隱藏中間4位
//        return desValue(phone, 7, 0, "*"); // 隱藏末尾4位
    }

    /**
     * 郵箱脫敏
     */
    public static String hideEmail(String email) {
        if (StrUtil.isEmpty(email)) {
            return null;
        }
        return email.replaceAll("(\\w?)(\\w+)(\\w)(@\\w+\\.[a-z]+(\\.[a-z]+)?)", "$1****$3$4");
    }

    /**
     * 身份證號(hào)脫敏
     */
    public static String hideIDCard(String idCard) {
        if (StrUtil.isEmpty(idCard)) {
            return null;
        }
        return idCard.replaceAll("(\\d{4})\\d{10}(\\w{4})", "$1*****$2");
    }

    /**
     * 對(duì)字符串進(jìn)行脫敏操作
     * @param origin          原始字符串
     * @param prefixNoMaskLen 左側(cè)需要保留幾位明文字段
     * @param suffixNoMaskLen 右側(cè)需要保留幾位明文字段
     * @param maskStr         用于遮罩的字符串, 如'*'
     * @return 脫敏后結(jié)果
     */
    public static String desValue(String origin, int prefixNoMaskLen, int suffixNoMaskLen, String maskStr) {
        if (StrUtil.isEmpty(origin)) {
            return null;
        }
        StringBuilder sb = new StringBuilder();
        for (int i = 0, n = origin.length(); i < n; i++) {
            if (i < prefixNoMaskLen) {
                sb.append(origin.charAt(i));
                continue;
            }
            if (i > (n - suffixNoMaskLen - 1)) {
                sb.append(origin.charAt(i));
                continue;
            }
            sb.append(maskStr);
        }
        return sb.toString();
    }

}

@Data
public class People {

    private Integer id;

    private String name;

    private Integer sex;

    private Integer age;

    @PrivacyEncrypt(type = PrivacyTypeEnum.PHONE) // 隱藏手機(jī)號(hào)
    private String phone;

    @PrivacyEncrypt(type = PrivacyTypeEnum.EMAIL) // 隱藏郵箱
    private String email;

    private String sign;
}