1：自定义注解

/**
 * 脱敏注解
 **/
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
@JacksonAnnotationsInside
@JsonSerialize(using = SensitiveSerialize.class)
public @interface Sensitive {

	/**
	 * 脱敏数据类型
	 */
	SensitiveTypeEnum type();

}

2：序列化

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 com.thk.utils.SensitiveUtils;
import lombok.AllArgsConstructor;
import lombok.NoArgsConstructor;

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

/**
 * 脱敏序列化
 */
@NoArgsConstructor
@AllArgsConstructor
public class SensitiveSerialize extends JsonSerializer<String> implements ContextualSerializer {

	private SensitiveTypeEnum type;

	@Override
	public void serialize(final String originStr, final JsonGenerator jsonGenerator,
                          final SerializerProvider serializerProvider) throws IOException {
		switch (type) {
		case CHINESE_NAME:
			jsonGenerator.writeString( SensitiveUtils.chineseName(originStr));
			break;
		case MOBILE_PHONE:
			jsonGenerator.writeString(SensitiveUtils.mobilePhone(originStr));
			break;
		case EMAIL:
			jsonGenerator.writeString(SensitiveUtils.email(originStr));
			break;
		case PASSWORD:
			jsonGenerator.writeString(SensitiveUtils.password(originStr));
			break;
		case KEY:
			jsonGenerator.writeString(SensitiveUtils.key(originStr));
			break;
		default:
			throw new IllegalArgumentException("未定义的敏感信息枚举类" + type);
		}
	}

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

}

3：脱敏类型枚举类

public enum SensitiveTypeEnum {

	/**
	 * 用户名, 唐*天, 李*
	 */
	CHINESE_NAME,
	/**
	 * 手机号, 17623****78
	 */
	MOBILE_PHONE,
	/**
	 * 电子邮件, 2423*****8@qq.com
	 */
	EMAIL,
	/**
	 * 密码, ******
	 */
	PASSWORD,
	/**
	 * 密钥最后三位其他都是***
	 */
	KEY

}

4：使用方法，用在实体类上，对昵称，邮箱，电话，进行脱敏处理

public class People  {
    private Integer bizCode;
    @NotNull(message = "id不能为空")
    private Long id;
    private String name;
    private Integer age;
    private String address;
    @Sensitive(type = SensitiveTypeEnum.CHINESE_NAME)
    private String userName;
    private String pwd;
    @Sensitive(type = SensitiveTypeEnum.EMAIL)
    private String email;
    @Sensitive(type = SensitiveTypeEnum.MOBILE_PHONE)
    private String phonenumber;
    private String sex;
}

5：postman测试