雪花Id发送给前端精度丢失
后端 Id 使用雪花id, 发送给前端后精度丢失. 比如 后端id: 1336489934697050113, 发送到前端后, 变成: 1336489934697050000
雪花 ID 是19 位, 而前端接收 Long 类型的是 Number, Number 的精度是16位, 这就导致了丢失数据
后端把数据传给前端的时候, 把 Long 类型序列化成 String 类型, 这样前端就可以用 String 来接收数据了
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;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
@Configuration
public class JacksonConfig {
@Bean
@Primary
@ConditionalOnMissingBean(ObjectMapper.class)
public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder) {
ObjectMapper objectMapper = builder.createXmlMapper(false).build();
// 全局配置序列化返回 JSON 处理
SimpleModule simpleModule = new SimpleModule();
// JSON Long ==> String
simpleModule.addSerializer(Long.class, ToStringSerializer.instance);
objectMapper.registerModule(simpleModule);
return objectMapper;
}
}