基于序列化怎么实现jackson

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基于序列化的实现

Fastjson实现

实现思路：

1. 自定义注解，可让用户自定义脱敏方式，用于实体类的属性

2. 基于ValueFilter进行 属性注解拦截，并多value进行替换脱敏

3. 使用json序列化对象是指定自定义序列化Filter

核心代码如下

自定义注解Desensitization

@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME)
public @interface Desensitization {
    /**
     * 脱敏规则
     *
     * @return
     */
    DesensitionEnum desensitionEnum();

}

脱敏方法

/**
 * 脱敏的函数接口
 */
public interface Desensitizer extends Function<String, String> {
}

@Getter
public enum DesensitionEnum {
    /**
     * 用户名脱敏
     */
    USERNAME("userName", "用户名",s -> s.replaceAll("(\\S)\\S(\\S*)", "$1*$2")),
    /**
     * 身份证号码脱敏
     */
    ID_CARD("idCard", "15或者18身份证号",s -> s.replaceAll("(\\d{4})\\d{10}(\\w{4})", "$1****$2")),
    /**
     * 手机号脱敏
     */
    PHONE("phone", "手机号",s -> s.replaceAll("(\\d{3})\\d{4}(\\d{4})", "$1****$2")),

    /**
     * 地址脱敏
      */
    ADDRESS("address", "地址脱敏",s -> s.replaceAll("(\\S{8})\\S{4}(\\S*)\\S{4}", "$1****$2****"));

    String fieldName;
    String fieldDescribe;
    private final Desensitizer desensitizer;

    DesensitionEnum(String fieldName, String fieldDescribe, Desensitizer desensitizer) {
        this.fieldName = fieldName;
        this.fieldDescribe = fieldDescribe;
        this.desensitizer = desensitizer;
    }

}

具体拦截

public class FastjsonDesensitizeFilter implements ValueFilter {
    @Override
    public Object process(Object object, String name, Object value) {
        if (null == value || !(value instanceof String) || ((String) value).length() == 0) {
            return value;
        }
        try {
            Field field = object.getClass().getDeclaredField(name);
            Desensitization desensitization;
            if (String.class != field.getType() || (desensitization = field.getAnnotation(Desensitization.class)) == null) {
                return value;
            }
            return desensitization.desensitionEnum().getDesensitizer().apply((String) value);
        } catch (Exception e) {
            return value;
        }
    }
}

Jackson实现

解释：

1. 获取对象属性上的注解，根据属性得到相应的脱敏规则类型

2. 按照规则类型进行value替换

自定义注解

@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME)
@JsonSerialize(using = JacksonDesensitize.class)
@JacksonAnnotationsInside
public @interface Desensitization {
    /**
     * 脱敏规则
     *
     * @return
     */
    DesensitionEnum desensitionEnum();

}




package com.demo.desensitization;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonProcessingException;
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 java.io.IOException;
import java.util.Objects;

public class JacksonDesensitize extends JsonSerializer<String> implements
        ContextualSerializer {

    private DesensitionEnum desensitionEnum;

    @Override
    public void serialize(String value, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException, JsonProcessingException {
        jsonGenerator.writeString(desensitionEnum.getDesensitizer().apply((String) value));
    }

    @Override
    public JsonSerializer<?> createContextual(SerializerProvider serializerProvider, BeanProperty beanProperty) throws JsonMappingException {
        if (beanProperty != null) {
            // 非 String 直接跳过
            if (Objects.equals(beanProperty.getType().getRawClass(), String.class)) {
                // 获取注解信息
                Desensitization annotation = beanProperty.getAnnotation(Desensitization.class);
                if (annotation == null) {
                    annotation = beanProperty.getContextAnnotation(Desensitization.class);
                }
                if (annotation != null) {
                    // 获得注解上的值并赋值
                    this.desensitionEnum = annotation.desensitionEnum();
                    return this;
                }
            }
            return serializerProvider.findValueSerializer(beanProperty.getType(), beanProperty);
        }
        return serializerProvider.findNullValueSerializer(null);

    }
}

执行结果

package com.demo.desensitization;

import lombok.Data;

import java.io.Serializable;

@Data
public class UserDTO implements Serializable {

    @Desensitization(desensitionEnum=DesensitionEnum.ID_CARD)
    private String idCard;
    @Desensitization(desensitionEnum=DesensitionEnum.USERNAME)
    private String username;
    @Desensitization(desensitionEnum=DesensitionEnum.PHONE)
    private String phone;
    @Desensitization(desensitionEnum=DesensitionEnum.ADDRESS)
    private String address;
}


    public static void testFast(){
        FastJsonConfig fastJsonConfig = new FastJsonConfig();
        fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat, SerializerFeature.DisableCircularReferenceDetect);
        fastJsonConfig.setSerializeFilters(new FastjsonDesensitizeFilter());
        UserDTO userDTO=new UserDTO();
        userDTO.setUsername("张三");
        userDTO.setPhone("15669057552");
        userDTO.setIdCard("370826198901133299");
        userDTO.setAddress("浙江省杭州市江干区火车东站");
        String s = JSON.toJSONString(userDTO,new FastjsonDesensitizeFilter());
        System.out.println(s);
    }

    public static void testJackson() throws JsonProcessingException {
        UserDTO userDTO=new UserDTO();
        userDTO.setUsername("张三");
        userDTO.setPhone("15669057552");
        userDTO.setIdCard("370826198901133299");
        userDTO.setAddress("浙江省杭州市江干区火车东站");
        ObjectMapper objectMapper = new ObjectMapper();
        String value = objectMapper.writeValueAsString(userDTO);
        System.out.println(value);
    }

最终输出结果

{"idCard":"3708****3299","username":"张*","phone":"156****7552","address":"浙江省杭州市江干区火车东站"}

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