web层返回值Long数据值太大丢失精度咋办

跟前端联调时，发现一个问题，返回给前端的字段id long型 后端postman 得到的是9433916916430849，但前端取到的是9433916916430848
这就很诡异！为啥前端得到的值会自动减一！

具体为啥会减一也没有搞清楚，但找到了解决办法~

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.WebMvcConfigurerAdapter;

import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;


@Configuration
public class WebConfig  extends WebMvcConfigurerAdapter {
    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        SimpleModule simpleModule = new SimpleModule();
        simpleModule.addSerializer(Long.TYPE, LongToStringSerializer.INSTANCE);
        simpleModule.addSerializer(Long.class, LongToStringSerializer.INSTANCE);

        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.registerModule(simpleModule);
        // JSON里面包含了实体没有的字段导致反序列化失败
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);


        converters.clear();
        converters.add(new MappingJackson2HttpMessageConverter(objectMapper));
        super.configureMessageConverters(converters);
    }
}

import java.io.IOException;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.annotation.JacksonStdImpl;
import com.fasterxml.jackson.databind.ser.std.StdSerializer;

@JacksonStdImpl
public class LongToStringSerializer extends StdSerializer<Long> {

    public static final LongToStringSerializer INSTANCE = new LongToStringSerializer();

    public static final int MIN_CONVER_LENGTH = 14;

    public LongToStringSerializer() {
        super(Long.class);
    }

    @Override
    public boolean isEmpty(SerializerProvider provider, Long value) {
        if (value == null) {
            return true;
        }
        return false;
    }

    @Override
    public void serialize(Long aLong, JsonGenerator jsonGenerator,
            SerializerProvider serializerProvider) throws IOException {
        int length = aLong.toString().length();
        if (length > MIN_CONVER_LENGTH) {
            jsonGenerator.writeString(aLong.toString());
        } else {
            jsonGenerator.writeNumber(aLong);
        }
    }
}