能看到這裏大概率說明你已經踩到這個坑了。
原因:
js 的 number 類型支持的最大值是9007199254740992 (2 的 53次方 -1),溢出之後的精度會丟失,導致前後端的值不一致。
java 的 long 類型最大值爲 9223372036854775807,遠高於 js number類型的最大值,所以這個坑就出現了。
解決方案:
- id-type: ID_WORKER_STR
簡單來說就是 id 轉 爲string類型,db和生成的id數據類型都改爲 string 類型
缺點:犧牲了 long 類型的性能優勢 - 通過 json 序列化做全局處理,傳給前端的是字符串,到後臺依然是 long 類型
import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.serializer.ValueFilter;
import com.alibaba.fastjson.support.config.FastJsonConfig;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
import org.apache.commons.lang3.StringUtils;
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;
import java.util.ArrayList;
import java.util.List;
/**
* @author :XiaoHui Yang
* @version : 1.0.0
* @description: 自定義JsonHttpMessageConverter解決long類型id丟精度問題
* @date :Created in 2020/6/28 14:41
* @modified By:
*/
@Configuration
public class CustomFastJsonHttpMessageConverter {
@Bean
public HttpMessageConverters fastJsonHttpMessageConverters() {
FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();
FastJsonConfig fastJsonConfig = new FastJsonConfig();
List<SerializerFeature> list = new ArrayList<>();
list.add(SerializerFeature.PrettyFormat);
list.add(SerializerFeature.WriteMapNullValue);
list.add(SerializerFeature.WriteNullStringAsEmpty);
list.add(SerializerFeature.WriteNullListAsEmpty);
list.add(SerializerFeature.QuoteFieldNames);
list.add(SerializerFeature.WriteDateUseDateFormat);
list.add(SerializerFeature.DisableCircularReferenceDetect);
list.add(SerializerFeature.WriteBigDecimalAsPlain);
fastJsonConfig.setSerializerFeatures(list.toArray(new SerializerFeature[list.size()]));
fastConverter.setFastJsonConfig(fastJsonConfig);
HttpMessageConverter<?> converter = fastConverter;
fastJsonConfig.setSerializeFilters(new ValueFilter() {
@Override
public Object process(Object object, String name, Object value) {
if ((StringUtils.endsWith(name, "Id") || StringUtils.equals(name,"id")) && value != null
&& value.getClass() == Long.class) {
return String.valueOf(value);
}
return value;
}
});
return new HttpMessageConverters(converter);
}
}
感謝閱讀,希望對你有幫助~