庫中存的值：23754851322302474
後端取的值：23754851322302474
前端得到值：23754851322302470，資料被四捨五入了

@JsonSerialize(using= ToStringSerializer.class)
private Long id;

package com.jiawa.wiki.config;

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

 
/**
 * 統一註解，解決前後端互動Long型別精度丟失的問題
 */
@Configuration
public class JacksonConfig {

    @Bean
    public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder) {
        ObjectMapper objectMapper = builder.createXmlMapper(false).build();
        //全域性配置序列化返回json處理
        SimpleModule simpleModule = new
 
 SimpleModule();
        //json Long ==>String
        simpleModule.addSerializer(Long.class, ToStringSerializer.instance);
        objectMapper.registerModule(simpleModule);
        return objectMapper;
    }
}