后端返回很大的数字类型 long 时 , 前端出现精度丢失情况的解决方案

错误现象

解决方案 ;

package com.cpucode.xxxxx.xxxx.config;

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
import org.springframework.boot.jackson.JsonComponent;
import org.springframework.context.annotation.Bean;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;

/**
 * @author : cpucode
 * @date : 2021/7/22
 * @time : 10:28
 * @github : https://github.com/CPU-Code
 * @csdn : https://blog.csdn.net/qq_44226094
 */
@JsonComponent
public class JsonSerializerManage {
    
    
    @Bean
    public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder) {
    
    
        ObjectMapper objectMapper = builder.createXmlMapper(false).build();
        //忽略value为null 时 key的输出
        objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);

        /**
         * 序列换成json时,将所有的long变成string
         * 因为js中得数字类型不能包含所有的java long值
         */
        SimpleModule module = new SimpleModule();
        module.addSerializer(Long.class, ToStringSerializer.instance);
        module.addSerializer(Long.TYPE, ToStringSerializer.instance);
        
        objectMapper.registerModule(module);
        return objectMapper;
    }
}

解决 :