Spring Mvc Long类型传输到前端精度丢失

问题描述

由于javascript的number类型问题，前端使用number接收后端的long类型时，后两位会变成00，导致前后端id不一致

解决思路

将后端的Long类型，在json序列化时，返回的类型为string类型

解决方案1

使用注解

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

解决方案2

全局处理，添加 http message转换器

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.WebMvcConfigurer;
import java.util.List;
@Configuration
public class WebConfiguration implements WebMvcConfigurer {
    /**
         * 序列化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
         */
    @Override
    public void configureMessageConverters(List> converters) {
        MappingJackson2HttpMessageConverter jackson2HttpMessageConverter = new MappingJackson2HttpMessageConverter();
        ObjectMapper objectMapper = new ObjectMapper();
        SimpleModule simpleModule=new SimpleModule();
        simpleModule.addSerializer(Long.class, ToStringSerializer.instance);
        simpleModule.addSerializer(Long.TYPE, ToStringSerializer.instance);
        objectMapper.registerModule(simpleModule);
        jackson2HttpMessageConverter.setObjectMapper(objectMapper);
        converters.add(0,jackson2HttpMessageConverter);
    }
}