springboot中使用long类型导致前端获取时精度丢失的问题

首先，实体类中的ID类型为LONG

前端接收到的ID精度丢失

{ "success": true, "code": "200", "data": [ { "id": 1199222178982396000, //这里精度丢失了！！ "idCard": "422202199910210811", "personName": "string", "age": 0, } ], "errorMessage": null, "currentTime": "2019-11-26T07:06:25.301+0000" }

但是数据库中的ID是正常的

原因：JS中没有长整型的类型，所以我们返回时应该转化为字符串类型

解决方案（SPRING BOOT版）

我这里使用的fastjson进行序列化

使用MAVEN引入FASTJSON的依赖

 <!--fastjson--> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.62</version> </dependency> 

FASTJSON的配置类

import com.alibaba.fastjson.serializer.SerializerFeature; import com.alibaba.fastjson.support.config.FastJsonConfig; import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter; import org.springframework.boot.autoconfigure.http.HttpMessageConverters; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.http.converter.HttpMessageConverter; /** * @Classname JsonConfig * @Date 2019/11/26 15:16 * @Created by ChuWanJiang */ @Configuration public class JsonConfig { @Bean public HttpMessageConverters fastJsonHttpMessageConverters() { // 1.定义一个converters转换消息的对象 FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter(); // 2.添加fastjson的配置信息，比如: 是否需要格式化返回的json数据 FastJsonConfig fastJsonConfig = new FastJsonConfig(); fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat); // 3.在converter中添加配置信息 fastConverter.setFastJsonConfig(fastJsonConfig); // 4.将converter赋值给HttpMessageConverter HttpMessageConverter<?> converter = fastConverter; // 5.返回HttpMessageConverters对象 return new HttpMessageConverters(converter); } }

最后在实体类中加上注解

    @ApiModelProperty(value = "id") @JSONField(serializeUsing = ToStringSerializer.class) @TableId(value = "id", type = IdType.ID_WORKER) private Long id;

其中，引入的类为

import com.alibaba.fastjson.annotation.JSONField; import com.alibaba.fastjson.serializer.ToStringSerializer;

大功告成

{ "code": "200", "currentTime": 1574752655889, "data": [ { "age": 0, "id": "1199225233215705089", "idCard": "422202199910210811", "personName": "string" } ], "success": true }