Long类型大精度导致前端精度丢失系列解决，雪花算法，Long序列化

本文介绍了如何使用Jackson库进行Long类型的序列化，如将Long转换为String并自定义序列化类。还涵盖了List<Long>转String和List<Long>转List<String>的实例，展示了如何处理不同数据结构间的转换。

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Long序列化String

    @JsonSerialize(using= ToStringSerializer.class)
    public Long getAreaId() {
        return areaId;
    }

List< Long>序列化String

@JsonSerialize(using= LongArrayToStringSerialize.class)

package com.xrkc.core.utils.serialize;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;

import java.io.IOException;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @Description:[204,205,207,209,210]转"204,205,207,209,210"
 * @Auther: wangjiao
 * @Date: 2021-10-14 20:44
 */
public class LongArrayToStringSerialize  extends JsonSerializer<List<Long>> {

    @Override
    public void serialize(List<Long> value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
        gen.writeString(value.stream().map(String::valueOf).collect(Collectors.joining(",")));
    }
}

List< Long>序列化List< String>

@JsonSerialize(using= LongArrayToListStringSerialize .class)

package com.xrkc.core.utils.serialize;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;

import java.io.IOException;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @Description: [11524009168281600, 11524739438551040]转 ["11524009168281600", "11524739438551040"]
 * @Auther: wangjiao
 * @Date: 2021-10-14 20:44
 */
public class LongArrayToListStringSerialize extends JsonSerializer<List<Long>> {

    @Override
    public void serialize(List<Long> value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
        List<String> strList = value.stream().map(x -> x + "").collect(Collectors.toList());
        String[] array = strList.toArray(new String[strList.size()]);
        gen.writeArray(array, 0, array.length);
    }
}