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1、问题

当实体类中的字段为Long类型时，通过Ajax请求返回给前段，在js中数据会丢失精度

直接通过postman请求或通过浏览器请求，看下响应则不会丢失精度

2、处理方式

1、使用@JsonSerialize注解

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

2、使用@JsonFormat注解

@JsonFormat(shape = JsonFormat.Shape.STRING)
private Long id;

3、全局配置ObjectMapper Bean

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;@Slf4j
@Configuration
public class JacksonConfig {/*** Jackson对象映射器* @param builder builder* @return ObjectMapper*/@Bean@Primary@ConditionalOnMissingBean(ObjectMapper.class)public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder) {try {// 将Long类型返回时修改为String类型builder.serializerByType(Long.TYPE, ToStringSerializer.instance);builder.serializerByType(Long.class, ToStringSerializer.instance);} catch (Exception e) {log.info("Serialization exception!");}return builder.build();}
}