springboot中使用FastJson解決long類型在js中失去精度的問題

更新時間：2022年06月15日 11:16:20 作者：Nightliar

這篇文章主要介紹了springboot中使用FastJson解決long類型在js中失去精度的問題，具有很好的參考價值，希望對大家有所幫助。如有錯誤或未考慮完全的地方，望不吝賜教

使用FastJson解決long類型在js中失去精度問題

1.pom中需要將默認的jackson排除掉

<dependency>
? ? <groupId>org.springframework.boot</groupId>
? ? <artifactId>spring-boot-starter-web</artifactId>
? ? <exclusions>
? ? ? ? <!-- json庫統(tǒng)一使用fastjson -->
? ? ? ? <exclusion>
? ? ? ? ? ? <groupId>com.fasterxml.jackson.core</groupId>
? ? ? ? ? ? <artifactId>jackson-databind</artifactId>
? ? ? ? </exclusion>
? ? </exclusions>
</dependency>

2.利用fastJson替換掉jackson

    package com.nightliar.bootdemo.config.spring;
import com.alibaba.fastjson.serializer.SerializeConfig;
import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.serializer.ToStringSerializer;
import com.alibaba.fastjson.support.config.FastJsonConfig;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
import com.nightliar.bootdemo.interceptor.GlobalInterceptor;
import com.nightliar.bootdemo.interceptor.LoginInterceptor;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.List;
/**
 * Created by Nightliar
 * 2018-08-15 11:09
 */
@Configuration
public class WebMvcConfig implements WebMvcConfigurer {
    /**
     * 添加攔截器
     */
    @Override
    public void addInterceptors(InterceptorRegistry registry){
        //全局攔截器
        registry.addInterceptor(new GlobalInterceptor())
                .addPathPatterns("/**")
                .excludePathPatterns("/static/**");
        //登陸攔截器
        registry.addInterceptor(new LoginInterceptor())
                .addPathPatterns("/**")
                .excludePathPatterns("/static/**");
    }
    /**
     * 利用fastJson替換掉jackson，且解決中文亂碼問題
     */
    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters){
        FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();
        FastJsonConfig fastJsonConfig = new FastJsonConfig();
        fastJsonConfig.setSerializerFeatures(
                SerializerFeature.DisableCircularReferenceDetect,
                SerializerFeature.WriteMapNullValue,
                SerializerFeature.WriteNullNumberAsZero,
                SerializerFeature.WriteNullStringAsEmpty,
                SerializerFeature.WriteNullListAsEmpty,
                SerializerFeature.WriteNullBooleanAsFalse,
                SerializerFeature.WriteNonStringKeyAsString,
                SerializerFeature.BrowserCompatible);
        //解決Long轉(zhuǎn)json精度丟失的問題
        SerializeConfig serializeConfig = SerializeConfig.globalInstance;
        serializeConfig.put(BigInteger.class, ToStringSerializer.instance);
        serializeConfig.put(Long.class, ToStringSerializer.instance);
        serializeConfig.put(Long.TYPE, ToStringSerializer.instance);
        fastJsonConfig.setSerializeConfig(serializeConfig);
        //處理中文亂碼問題
        List<MediaType> fastMediaTypes = new ArrayList<>();
        fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);
        fastConverter.setSupportedMediaTypes(fastMediaTypes);
        fastConverter.setFastJsonConfig(fastJsonConfig);
        converters.add(fastConverter);
    }
}

springboot long精度缺失問題

?/**
? ? ?* 解決Jackson導(dǎo)致Long型數(shù)據(jù)精度丟失問題
? ? ?* @return
? ? ?*/
? ? @Bean("jackson2ObjectMapperBuilderCustomizer")
? ? public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() {
? ? ? ? Jackson2ObjectMapperBuilderCustomizer customizer = new Jackson2ObjectMapperBuilderCustomizer() {
? ? ? ? ? ? @Override
? ? ? ? ? ? public void customize(Jackson2ObjectMapperBuilder jacksonObjectMapperBuilder) {
? ? ? ? ? ? ? ? jacksonObjectMapperBuilder.serializerByType(Long.class, ToStringSerializer.instance)
? ? ? ? ? ? ? ? ? ? ? ? .serializerByType(Long.TYPE, ToStringSerializer.instance);
? ? ? ? ? ? }
? ? ? ? };
? ? ? ? return customizer;
}

問題

jackson2ObjectMapperBuilderCustomizer不生效

主要是重復(fù)了

在WebMvcConfigurer中添加

@Autowired(required = false)
? ? private MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter;
?
? ? @Override
? ? public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
? ? ? ? converters.removeIf(converter -> converter instanceof MappingJackson2HttpMessageConverter);
? ? ? ? if (Objects.isNull(mappingJackson2HttpMessageConverter)) {
? ? ? ? ? ? converters.add(0, new MappingJackson2HttpMessageConverter());
? ? ? ? } else {
? ? ? ? ? ? converters.add(0, mappingJackson2HttpMessageConverter);
? ? ? ? }
}

以上為個人經(jīng)驗，希望能給大家一個參考，也希望大家多多支持腳本之家。

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