javaLong类型在前端json数据损失精度

方法一：重新生成pojo对象，将所有数据库类型为bigint都映射成String类

方法二：对于使用springboot，则增加配置代码：

package com.gj.app.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.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;import java.util.List;@EnableWebMvc
@Configuration
public class WebDataConvertConfig extends WebMvcConfigurerAdapter {public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {MappingJackson2HttpMessageConverter jackson2HttpMessageConverter = new MappingJackson2HttpMessageConverter();ObjectMapper objectMapper = new ObjectMapper();/*** 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 simpleModule = new SimpleModule();simpleModule.addSerializer(Long.class, ToStringSerializer.instance);simpleModule.addSerializer(Long.TYPE, ToStringSerializer.instance);objectMapper.registerModule(simpleModule);jackson2HttpMessageConverter.setObjectMapper(objectMapper);converters.add(jackson2HttpMessageConverter);}
}

https://blog.csdn.net/xiaoxiangzi520/article/details/76522242?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-3.channel_param&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-3.channel_param

方法三：Java传值给前端进行JSON序列化时，将Long 类型转成string 类型序列化。（推荐）

使用 @JsonSerialize(using = ToStringSerializer.class) 注解