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背景：曾经遇到一个很麻烦的事情，就是一个json串中有很多占位符，需要替换成特定文案。如果将json转换成对象后，在一个一个属性去转换的话就出出现很多冗余代码，不美观也不是很实用。

而且也不能提前在json串中替换，因为替换的文案会因为某些变量发生改变。就比如国际化，在中文的时候应该是"你好"，而在英文的时候要出现"Hello"。

所以我想到一个方法，为什么不能再json反序列化的时候，把这些都做好呢？

以下的代码介绍的是，我自己扩展的一点点fastjson代码，增加了在反序列化的时候可以对所有的值进行修改的方案。

注意：这个方案会对fastjson反序列化的速度有一定的影响，我只是用来做配置的反序列化，完成后将反序列化的东西缓存起来使用。

使用方式有两种

一种是直接通过 @JsonDeserializer 注解的valueMutators属性注入这种方式有个缺陷,你的修改器必须有无参构造函数的 

@JsonDeserializer(valueMutators = {CoustomizeValueMutator.class})
@Getter
@Setter
public class User {

    private String name;
    ...
}  

第二种方式是通过直接创建的方式,使用反序列化工具，这种方式支持有参构造函数。

        CoustomizeValueMutator zhCoustomizeValueMutator = new CoustomizeValueMutator(zh);
        User user = CustomizeJSON.parseObject(userStr, User.class, zhCoustomizeValueMutator);

下面先展示一下使用效果，测试代码如下：

import com.alibaba.fastjson.parser.deserializer.CustomizeJSON;
import com.raiden.model.*;
import org.junit.jupiter.api.Test;

import java.util.*;


/**
 * @创建人:Raiden
 * @Descriotion:
 * @Date:Created in 22:39 2020/1/28
 * @Modified By:
 */
public class AppTest {

    @Test
    public void testFastJosn() throws Throwable {
        String userStr = "{\n" +
                "\t\"id\":\"I18nKey:20200411001\",\n" +
                "\t\"a\":\"I18nKey:张三\",\n" +
                "\t\"student\":\"I18nKey:高三三班\",\n" +
                "\t\"contents\":[\"I18nKey:1\",\"I18nKey:2\"]\n" +
                "}";
        Map<String, String> en = new HashMap<>();
        en.put("3", "zhangsan");
        en.put("4", "20200411001");
        en.put("5", "Class three in grade three");
        en.put("1", "Hello");
        en.put("2", "Welcome home");
        Map<String, String> zh = new HashMap<>();
        zh.put("3", "张三");
        zh.put("4", "20200411001");
        zh.put("5", "高三三班");
        zh.put("1", "你好");
        zh.put("2", "欢迎回家");
        CoustomizeValueMutator zhCoustomizeValueMutator = new CoustomizeValueMutator(zh);

        User user = CustomizeJSON.parseObject(userStr, User.class, zhCoustomizeValueMutator);
        System.err.println(user);
        String string = "{\n" +
                "\t\"users\": [{\n" +
                "\t\t\"id\": \"I18nKey:4\",\n" +
                "\t\t\"a\": \"I18nKey:3\",\n" +
                "\t\t\"student\": \"I18nKey:5\",\n" +
                "\t\t\"url\": \"www.baidu.com\",\n" +
                "\t\t\"contents\": [\"I18nKey:1\", \"I18nKey:2\"]\n" +
                "\t}],\n" +
                "\t\"memberId\":\"2020\"\n" +
                "}";
        CoustomizeValueMutator enCoustomizeValueMutator = new CoustomizeValueMutator(en);
        Administration administration = CustomizeJSON.parseObject(string, Administration.class, enCoustomizeValueMutator);
        System.err.println(administration);
    }
}

运行效果：

 下面是测试模型代码：

import com.alibaba.fastjson.parser.deserializer.JsonDeserializer;
import com.raiden.CoustomizeValueMutator;
import lombok.Getter;
import lombok.Setter;

import java.util.List;

/**
 * @创建人:Raiden
 * @Descriotion:
 * @Date:Created in 23:56 2020/4/17
 * @Modified By:
 */
@JsonDeserializer
@Getter
@Setter
public class Administration {

    private List<User> users;
    private String memberId;

    @Override
    public String toString() {
        return "Administration{" +
                "users=" + users +
                ", memberId='" + memberId + '\'' +
                '}';
    }
}

import com.alibaba.fastjson.parser.deserializer.JsonDeserializer;
import lombok.Getter;
import lombok.Setter;

import java.util.List;

/**
 * @创建人:Raiden
 * @Descriotion:
 * @Date:Created in 15:53 2020/3/21
 * @Modified By:
 */
@JsonDeserializer
@Getter
@Setter
public class User {

    private String name;
    private String id;
    private String student;
    private List<String> contents;
    private String url;

    @Override
    public String toString() {
        return "User{" +
                "name='" + name + '\'' +
                ", id='" + id + '\'' +
                ", student='" + student + '\'' +
                ", contents='" + contents.toString() + '\'' +
                ", url='" + url + '\'' +
                '}';
    }
}

自定义的反序列化值修改器：

import com.alibaba.fastjson.parser.deserializer.DeserializerValueMutator;

import java.lang.annotation.Annotation;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/**
 * @创建人:Raiden
 * @Descriotion:
 * @Date:Created in 22:15 2020/5/1
 * @Modified By:
 */
public class CoustomizeValueMutator implements DeserializerValueMutator {

    private Map<String, String> dataSource;

    public CoustomizeValueMutator(Map<String, String> dataSource){
        this.dataSource = dataSource;
    }
    @Override
    public Object process(Object object, Annotation[] annotations, String name, Object value) {
        if (value instanceof List){
            List list = new ArrayList();
            for (Object o : (List) value){
                if (!(o instanceof String)){
                    return value;
                }
                list.add(DeserializerUtils.deserializer(o, dataSource));
            }
            return list;
        }
        return DeserializerUtils.deserializer(value, dataSource);
    }
}

一些工具类和静态资源类：

/**
 * @创建人:Raiden
 * @Descriotion:
 * @Date:Created in 23:00 2020/4/17
 * @Modified By:
 */
public class CustomizeStaticConfig {
    public static final String I18N_KEY = "I18nKey:";
}

import org.apache.commons.lang3.StringUtils;

import java.util.Map;

/**
 * @创建人:Raiden
 * @Descriotion:
 * @Date:Created in 0:15 2020/4/18
 * @Modified By:
 */
public final class DeserializerUtils {

    public static final Object deserializer(Object value, Map<String, String> languageConfig){
        String result = null;
        if (value.getClass() == String.class && StringUtils.contains((result = ((String) value).trim()), CustomizeStaticConfig.I18N_KEY)){
            int indexOf = result.indexOf(CustomizeStaticConfig.I18N_KEY) + CustomizeStaticConfig.I18N_KEY.length();
            String key = StringUtils.substring(result, indexOf);
            return languageConfig.getOrDefault(key, result);
        }
        return value;
    }
}

 下面给出的是扩展的关键代码。

首先是自定义解析配置类，这个类是核心。这个类继承了 com.alibaba.fastjson.parser.ParserConfig 类。覆写了其两个核心方法。

方法一：

createFieldDeserializer(ParserConfig mapping, JavaBeanInfo beanInfo, FieldInfo fieldInfo) 创建一个属性反序列化处理类

该方法的修改，是将源码中的 ArrayListTypeFieldDeserializer 替换成 我们自定义的 CustomizeArrayListTypeFieldDeserializer 处理器。

将源码中的 DefaultFieldDeserializer 替换成 我们自定义的 CustomizeDefaultFieldDeserializer 处理器

方法二：

createJavaBeanDeserializer(Class<?> clazz, Type type)  创建一个 JavaBean 反序列化处理器

新增判断逻辑，如果要反序列化的类上存在 @JsonDeserializer 标识注解，返回包含自定义配置类的 JavaBeanDeserializer。

import com.alibaba.fastjson.annotation.JSONField;
import com.alibaba.fastjson.parser.ParserConfig;
import com.alibaba.fastjson.util.FieldInfo;
import com.alibaba.fastjson.util.JavaBeanInfo;

import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;
/**
 * @创建人:Raiden
 * @Descriotion:
 * @Date:Created in 21:52 2020/4/17
 * @Modified By: 自定义fastjson 解析配置类 这个类是核心
 */
public class CustomizeParserConfig extends ParserConfig {

    /**
     * 值修改器数组 可以将类修改器放入其中使用
     */
    private DeserializerValueMutator[] valueMutators;

    public CustomizeParserConfig(){
    }

    /**
     * 有参构造方法 可以通过该方法 将类修改器放入其中
     * @param valueMutators
     */
    public CustomizeParserConfig(DeserializerValueMutator... valueMutators){
        super();
        this.valueMutators = valueMutators;
    }

    /**
     * 创建一个属性反序列化处理类
     * @param mapping
     * @param beanInfo
     * @param fieldInfo
     * @return
     */
    @Override
    public FieldDeserializer createFieldDeserializer(ParserConfig mapping, //
                                                     JavaBeanInfo beanInfo, //
                                                     FieldInfo fieldInfo) {
        //获取要反序列化的model 的class
        Class<?> clazz = beanInfo.clazz;
        //获取要反序列化属性的 class
        Class<?> fieldClass = fieldInfo.fieldClass;

        Class<?> deserializeUsing = null;
        JSONField annotation = fieldInfo.getAnnotation();
        if (annotation != null) {
            deserializeUsing = annotation.deserializeUsing();
            if (deserializeUsing == Void.class) {
                deserializeUsing = null;
            }
        }

        if (deserializeUsing == null && (fieldClass == List.class || fieldClass == ArrayList.class)) {
            //将源码中的 ArrayListTypeFieldDeserializer 替换成 我们自定义的 CustomizeArrayListTypeFieldDeserializer 处理器
            return new CustomizeArrayListTypeFieldDeserializer(clazz, fieldInfo, valueMutators);
        }
        //将源码中的 DefaultFieldDeserializer 替换成 我们自定义的 CustomizeDefaultFieldDeserializer 处理器
        return new CustomizeDefaultFieldDeserializer(mapping, clazz, fieldInfo, valueMutators);
    }

    /**
     * 创建一个 javaBean 反序列化处理器
     * @param clazz
     * @param type
     * @return
     */
    @Override
    public ObjectDeserializer createJavaBeanDeserializer(Class<?> clazz, Type type) {
        //获取要反序列化类上的标识注解
        JsonDeserializer jsonDeserializer = clazz.getAnnotation(JsonDeserializer.class);
        //如果不存在就走原逻辑
        if (jsonDeserializer != null){
            //获取注解中的反序列化值处理器
            Class<? extends DeserializerValueMutator>[] classes = jsonDeserializer.valueMutators();
            if (classes != null && classes.length > 0){
                DeserializerValueMutator[] mutators = new DeserializerValueMutator[classes.length];
                int size = 0;
                for (Class<? extends DeserializerValueMutator> c : classes) {
                    try {
                        DeserializerValueMutator mutator = c.newInstance();
                        mutators[size] = mutator;
                        size++;
                    } catch (Exception e) {
                        //如果创建失败了就忽略掉这次错误
                    }
                }
                if (size > 0){
                    //判断原来是否有值 如果有 就合并成一组
                    if (valueMutators != null){
                        DeserializerValueMutator[] newValueMutators = new DeserializerValueMutator[size + valueMutators.length];
                        System.arraycopy(valueMutators, 0, newValueMutators, 0, valueMutators.length);
                        System.arraycopy(mutators, 0, newValueMutators, valueMutators.length, size);
                        this.valueMutators = newValueMutators;
                    }else {
                        this.valueMutators = new DeserializerValueMutator[size];
                        System.arraycopy(mutators, 0, valueMutators, 0, size);
                    }
                }
            }
            if (valueMutators != null){
                return new JavaBeanDeserializer(this, clazz);
            }
        }
        return super.createJavaBeanDeserializer(clazz, type);
    }
}

 CustomizeDefaultFieldDeserializer 类继承了 DefaultFieldDeserializer 类在构造方法中新增了参数 valueMutators(值修改器数组)

并在 public void setValue(Object object, Object value) 方法中新增了逻辑如果值修改器数组中存在值修改器，就遍历所有的修改器，

依次调用修改器的 process方法修改值。

import com.alibaba.fastjson.JSONException;
import com.alibaba.fastjson.parser.ParserConfig;
import com.alibaba.fastjson.util.FieldInfo;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.Collections;
import java.util.Map;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;

/**
 * @创建人:Raiden
 * @Descriotion:
 * @Date:Created in 0:13 2020/4/18
 * @Modified By: 替代fastjson中 对象反序列化处理类
 */
public class CustomizeDefaultFieldDeserializer extends DefaultFieldDeserializer {

    private DeserializerValueMutator[] valueMutators;

    public CustomizeDefaultFieldDeserializer(ParserConfig config, Class<?> clazz, FieldInfo fieldInfo,DeserializerValueMutator[] valueMutators) {
        super(config, clazz, fieldInfo);
        this.valueMutators = valueMutators;
    }

    public void setValue(Object object, Object value) {
        if (value == null //
                && fieldInfo.fieldClass.isPrimitive()) {
            return;
        } else if (fieldInfo.fieldClass == String.class
                && fieldInfo.format != null
                && fieldInfo.format.equals("trim")){
            value = ((String) value).trim();
        }
        try {
            /**
             * 如果值修改器数组中存在值修改器实例，就遍历该数组，依次调用所有的修改器的 process方法
             */
            if (valueMutators != null && valueMutators.length > 0){
                for (DeserializerValueMutator mutator : valueMutators){
                    value = mutator.process(object,fieldInfo.field.getAnnotations(), fieldInfo.name, value);
                }
            }
            Method method = fieldInfo.method;
            if (method != null) {
                if (fieldInfo.getOnly) {
                    if (fieldInfo.fieldClass == AtomicInteger.class) {
                        AtomicInteger atomic = (AtomicInteger) method.invoke(object);
                        if (atomic != null) {
                            atomic.set(((AtomicInteger) value).get());
                        }
                    } else if (fieldInfo.fieldClass == AtomicLong.class) {
                        AtomicLong atomic = (AtomicLong) method.invoke(object);
                        if (atomic != null) {
                            atomic.set(((AtomicLong) value).get());
                        }
                    } else if (fieldInfo.fieldClass == AtomicBoolean.class) {
                        AtomicBoolean atomic = (AtomicBoolean) method.invoke(object);
                        if (atomic != null) {
                            atomic.set(((AtomicBoolean) value).get());
                        }
                    } else if (Map.class.isAssignableFrom(method.getReturnType())) {
                        Map map = (Map) method.invoke(object);
                        if (map != null) {
                            if (map == Collections.emptyMap()
                                    || map.getClass().getName().startsWith("java.util.Collections$Unmodifiable")) {
                                // skip
                                return;
                            }

                            map.putAll((Map) value);
                        }
                    } else {
                        Collection collection = (Collection) method.invoke(object);
                        if (collection != null && value != null) {
                            if (collection == Collections.emptySet()
                                    || collection == Collections.emptyList()
                                    || collection.getClass().getName().startsWith("java.util.Collections$Unmodifiable")) {
                                // skip
                                return;
                            }

                            collection.clear();
                            collection.addAll((Collection) value);
                        }
                    }
                } else {
                    method.invoke(object, value);
                }
            } else {
                final Field field = fieldInfo.field;

                if (fieldInfo.getOnly) {
                    if (fieldInfo.fieldClass == AtomicInteger.class) {
                        AtomicInteger atomic = (AtomicInteger) field.get(object);
                        if (atomic != null) {
                            atomic.set(((AtomicInteger) value).get());
                        }
                    } else if (fieldInfo.fieldClass == AtomicLong.class) {
                        AtomicLong atomic = (AtomicLong) field.get(object);
                        if (atomic != null) {
                            atomic.set(((AtomicLong) value).get());
                        }
                    } else if (fieldInfo.fieldClass == AtomicBoolean.class) {
                        AtomicBoolean atomic = (AtomicBoolean) field.get(object);
                        if (atomic != null) {
                            atomic.set(((AtomicBoolean) value).get());
                        }
                    } else if (Map.class.isAssignableFrom(fieldInfo.fieldClass)) {
                        Map map = (Map) field.get(object);
                        if (map != null) {
                            if (map == Collections.emptyMap()
                                    || map.getClass().getName().startsWith("java.util.Collections$Unmodifiable")) {
                                // skip
                                return;
                            }
                            map.putAll((Map) value);
                        }
                    } else {
                        Collection collection = (Collection) field.get(object);
                        if (collection != null && value != null) {
                            if (collection == Collections.emptySet()
                                    || collection == Collections.emptyList()
                                    || collection.getClass().getName().startsWith("java.util.Collections$Unmodifiable")) {
                                // skip
                                return;
                            }

                            collection.clear();
                            collection.addAll((Collection) value);
                        }
                    }
                } else {
                    if (field != null) {
                        field.set(object, value);
                    }
                }
            }
        } catch (Exception e) {
            throw new JSONException("set property error, " + clazz.getName() + "#" + fieldInfo.name, e);
        }
    }
}

类CustomizeArrayListTypeFieldDeserializer 和 类CustomizeDefaultFieldDeserializer 改动类似。

import com.alibaba.fastjson.JSONException;
import com.alibaba.fastjson.parser.ParserConfig;
import com.alibaba.fastjson.util.FieldInfo;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.Collections;
import java.util.Map;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;

/**
 * @创建人:Raiden
 * @Descriotion:
 * @Date:Created in 0:13 2020/4/18
 * @Modified By: 替代fastjson中 对象反序列化处理类
 */
public class CustomizeDefaultFieldDeserializer extends DefaultFieldDeserializer {

    private DeserializerValueMutator[] valueMutators;

    public CustomizeDefaultFieldDeserializer(ParserConfig config, Class<?> clazz, FieldInfo fieldInfo,DeserializerValueMutator[] valueMutators) {
        super(config, clazz, fieldInfo);
        this.valueMutators = valueMutators;
    }

    public void setValue(Object object, Object value) {
        if (value == null //
                && fieldInfo.fieldClass.isPrimitive()) {
            return;
        } else if (fieldInfo.fieldClass == String.class
                && fieldInfo.format != null
                && fieldInfo.format.equals("trim")){
            value = ((String) value).trim();
        }
        try {
            /**
             * 如果值修改器数组中存在值修改器实例，就遍历该数组，依次调用所有的修改器的 process方法
             */
            if (valueMutators != null && valueMutators.length > 0){
                for (DeserializerValueMutator mutator : valueMutators){
                    value = mutator.process(object,fieldInfo.field.getAnnotations(), fieldInfo.name, value);
                }
            }
            Method method = fieldInfo.method;
            if (method != null) {
                if (fieldInfo.getOnly) {
                    if (fieldInfo.fieldClass == AtomicInteger.class) {
                        AtomicInteger atomic = (AtomicInteger) method.invoke(object);
                        if (atomic != null) {
                            atomic.set(((AtomicInteger) value).get());
                        }
                    } else if (fieldInfo.fieldClass == AtomicLong.class) {
                        AtomicLong atomic = (AtomicLong) method.invoke(object);
                        if (atomic != null) {
                            atomic.set(((AtomicLong) value).get());
                        }
                    } else if (fieldInfo.fieldClass == AtomicBoolean.class) {
                        AtomicBoolean atomic = (AtomicBoolean) method.invoke(object);
                        if (atomic != null) {
                            atomic.set(((AtomicBoolean) value).get());
                        }
                    } else if (Map.class.isAssignableFrom(method.getReturnType())) {
                        Map map = (Map) method.invoke(object);
                        if (map != null) {
                            if (map == Collections.emptyMap()
                                    || map.getClass().getName().startsWith("java.util.Collections$Unmodifiable")) {
                                // skip
                                return;
                            }

                            map.putAll((Map) value);
                        }
                    } else {
                        Collection collection = (Collection) method.invoke(object);
                        if (collection != null && value != null) {
                            if (collection == Collections.emptySet()
                                    || collection == Collections.emptyList()
                                    || collection.getClass().getName().startsWith("java.util.Collections$Unmodifiable")) {
                                // skip
                                return;
                            }

                            collection.clear();
                            collection.addAll((Collection) value);
                        }
                    }
                } else {
                    method.invoke(object, value);
                }
            } else {
                final Field field = fieldInfo.field;

                if (fieldInfo.getOnly) {
                    if (fieldInfo.fieldClass == AtomicInteger.class) {
                        AtomicInteger atomic = (AtomicInteger) field.get(object);
                        if (atomic != null) {
                            atomic.set(((AtomicInteger) value).get());
                        }
                    } else if (fieldInfo.fieldClass == AtomicLong.class) {
                        AtomicLong atomic = (AtomicLong) field.get(object);
                        if (atomic != null) {
                            atomic.set(((AtomicLong) value).get());
                        }
                    } else if (fieldInfo.fieldClass == AtomicBoolean.class) {
                        AtomicBoolean atomic = (AtomicBoolean) field.get(object);
                        if (atomic != null) {
                            atomic.set(((AtomicBoolean) value).get());
                        }
                    } else if (Map.class.isAssignableFrom(fieldInfo.fieldClass)) {
                        Map map = (Map) field.get(object);
                        if (map != null) {
                            if (map == Collections.emptyMap()
                                    || map.getClass().getName().startsWith("java.util.Collections$Unmodifiable")) {
                                // skip
                                return;
                            }
                            map.putAll((Map) value);
                        }
                    } else {
                        Collection collection = (Collection) field.get(object);
                        if (collection != null && value != null) {
                            if (collection == Collections.emptySet()
                                    || collection == Collections.emptyList()
                                    || collection.getClass().getName().startsWith("java.util.Collections$Unmodifiable")) {
                                // skip
                                return;
                            }

                            collection.clear();
                            collection.addAll((Collection) value);
                        }
                    }
                } else {
                    if (field != null) {
                        field.set(object, value);
                    }
                }
            }
        } catch (Exception e) {
            throw new JSONException("set property error, " + clazz.getName() + "#" + fieldInfo.name, e);
        }
    }
}

下面是值修改器接口定义：

import java.lang.annotation.Annotation;

/**
 * @创建人:Raiden
 * @Descriotion:
 * @Date:Created in 22:01 2020/5/1
 * @Modified By: 反序列化值修改器接口
 */
public interface DeserializerValueMutator {

    Object process(Object object, Annotation[] annotations, String name, Object value);
}

反序列化标识注解，只有用这个注解注释的类才会执行拓展的方法。

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

/**
 * @创建人:Raiden
 * @Descriotion:
 * @Date:Created in 22:25 2020/4/17
 * @Modified By: 反序列化值修改标识注解
 */
@Retention(RetentionPolicy.RUNTIME)
@Target({ ElementType.TYPE })
public @interface JsonDeserializer {
    /**
     * 注意这里只能放无参构造函数的修改器 否则会创建失败
     * @return
     */
    Class<? extends DeserializerValueMutator>[] valueMutators() default {};
}

强化的JSON序列化工具类：

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.parser.Feature;

import java.lang.reflect.Type;

/**
 * @创建人:Raiden
 * @Descriotion:
 * @Date:Created in 22:12 2020/5/1
 * @Modified By: 反序列化工具类
 */
public final class CustomizeJSON {

    public static <T> T parseObject(String input,Type clazz,DeserializerValueMutator... valueMutators) {
        return JSON.parseObject(input, clazz, new CustomizeParserConfig(valueMutators));
    }

    public static <T> T parseObject(String json, Type type,DeserializerValueMutator[] valueMutators, Feature... features) {
        return JSON.parseObject(json, type, new CustomizeParserConfig(valueMutators), features);
    }

    public static <T> T parseObject(String json, Type type,Feature... features) {
        return JSON.parseObject(json, type, new CustomizeParserConfig(), features);
    }

    public static <T> T parseObject(String json, Type type) {
        return JSON.parseObject(json, type, new CustomizeParserConfig());
    }
}

以上代码都可以在我的git中下载：https://github.com/RaidenXin/fastjson-deserializer.git

创作不易，如果转载请注明出处，小编在此感谢各位看官。

如果觉得有用，请看官们点个赞，谢谢。

如果有想学Redis的可以关注我的Redis文章系列：

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小白也能看懂的REDIS教学基础篇——朋友面试被SKIPLIST跳跃表拦住了