Java利用Jackson序列化实现数据脱敏

几天前使用了Jackson对数据的自定义序列化。突发灵感，利用此方法来简单实现接口返回数据脱敏，故写此文记录。

核心思想是利用Jackson的StdSerializer,@JsonSerialize，以及自己实现的数据脱敏过程。

使用效果如下:

首先在需要进行脱敏的VO字段上面标注相关脱敏注解

调用接口即可看到脱敏效果

实现过程如下:

1. 定义脱敏的过程实现

/**
 * Created by EalenXie on 2021/9/24 15:52
 * 顶级的脱敏器
 */
public interface Desensitization {

    /**
     * 脱敏实现
     *
     * @param target 脱敏对象
     * @return 脱敏返回结果
     */
    T desensitize(T target);

}

比如具体的手机号脱敏器实现

import com.github.Symbol;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Created by EalenXie on 2021/9/24 15:56
 * 手机号脱敏器 默认只保留前3位和后4位
 */
public class PhoneDesensitization implements StringDesensitization {

    /**
     * 手机号正则
     */
    private static final Pattern DEFAULT_PATTERN = Pattern.compile("(13[0-9]|14[579]|15[0-3,5-9]|16[6]|17[0135678]|18[0-9]|19[89])\d{8}");

    /**
     * 手机号脱敏 只保留前3位和后4位
     */
    @Override
    public String desensitize(String target) {
        Matcher matcher = DEFAULT_PATTERN.matcher(target);
        while (matcher.find()) {
            String group = matcher.group();
            target = target.replace(group, group.substring(0, 3) + Symbol.getSymbol(4, Symbol.STAR) + group.substring(7, 11));
        }
        return target;
    }
}

2.定义脱敏注解,并指明了使用的序列化器,注解中声明了使用的脱敏器实现

package com.github.annotation;

import com.fasterxml.jackson.annotation.JacksonAnnotationsInside;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;
import com.github.desensitization.Desensitization;
import com.github.serializer.ObjectDesensitizeSerializer;

import java.lang.annotation.*;

/**
 * Created by EalenXie on 2021/10/8 11:30
 */
@Target({ElementType.FIELD, ElementType.ANNOTATION_TYPE})
@Retention(RetentionPolicy.RUNTIME)
@JacksonAnnotationsInside
@JsonSerialize(using = ObjectDesensitizeSerializer.class)
@Documented
public @interface Desensitize {
    /**
     * 脱敏器实现
     */
    @SuppressWarnings("all")
    Class> desensitization();
}

3. 实现定义的序列化器

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.BeanProperty;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.ser.ContextualSerializer;
import com.fasterxml.jackson.databind.ser.std.StdSerializer;
import com.github.Symbol;
import com.github.annotation.Desensitize;
import com.github.desensitization.Desensitization;
import com.github.desensitization.DesensitizationFactory;
import com.github.desensitization.StringDesensitization;

import java.io.IOException;

/**
 * Created by EalenXie on 2021/8/9 9:03
 * 脱敏序列化器
 */
public class ObjectDesensitizeSerializer extends StdSerializer