java实现手机号脱敏

自定义一个注解（需要依赖jackson。jar包）

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
@JacksonAnnotationsInside
@JsonSerialize(using = SensitiveJsonSerializer.class)
public @interface Sensitive {
    SensitiveStrategy starategy();
}

定义一个枚举类SensitiveStrategy（仅支持java8以后，8以前没有Function方法）

public enum SensitiveStrategy {

    ID_CARD(s -> s.replaceAll("^(.{3})(?:\\d+)(.{4})","$1****$2")),
    PHONE(s -> s.replaceAll("^(.{3})(?:\\d+)(.{4})","$1****$2")),
    ADDRESS(s -> s.replaceAll("^(.{2})(?:\\S+)(.{2})","$1****$2")),
    BANKCARD(s -> s.replaceAll("^(.{5})(?:\\d+)(.{5})","$1****$2"));


    private final Function<String,String> desensitizer;

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

    public Function<String,String> desensitizer(){
        return desensitizer;
    }
}

定义一个序列化器SensitiveJsonSerializer

public class SensitiveJsonSerializer extends JsonSerializer<String> implements ContextualSerializer {

    private SensitiveStrategy strategy;

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

    @Override
    public JsonSerializer<?> createContextual(SerializerProvider provider, BeanProperty property) throws JsonMappingException {
        Sensitive annotation = property.getAnnotation(Sensitive.class);
        if (Objects.nonNull(annotation) && Objects.equals(String.class, property.getType().getRawClass())) {
            this.strategy = annotation.starategy();
            return this;
        }
        return provider.findValueSerializer(property.getType(), property);
    }
}

然后在需要脱敏的实体类字段上加上自定义注解

@ApiModelProperty(value = "电话")
@Sensitive(starategy = SensitiveStrategy.PHONE)
private String tel;

正则式根据自己业务需求进行更改