springboot中使用FastJson解决long类型在js中失去精度的问题

使用FastJson解决long类型在js中失去精度问题

1.pom中需要将默认的jackson排除掉

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <exclusions>
        <!-- json库统一使用fastjson -->
        <exclusion>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
        </exclusion>
    </exclusions>
</dependency>

2.利用fastJson替换掉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 *
    */
   @Override
   public void addInterceptors(InterceptorRegistry registry){
       //全局 *
       registry.addInterceptor(new GlobalInterceptor())
               .addPathPatterns("/**")
               .excludePathPatterns("/static/**");
       //登陆 *
       registry.addInterceptor(new LoginInterceptor())
               .addPathPatterns("/**")
               .excludePathPatterns("/static/**");
   }
   /**
    * 利用fastJson替换掉jackson，且解决中文乱码问题
    */
   @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);
       //解决Long转json精度丢失的问题
       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);
       //处理中文乱码问题
       List<MediaType> fastMediaTypes = new ArrayList<>();
       fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);
       fastConverter.setSupportedMediaTypes(fastMediaTypes);
       fastConverter.setFastJsonConfig(fastJsonConfig);
       converters.add(fastConverter);
   }
}

springboot long精度缺失问题

 /**
     * 解决Jackson导致Long型数据精度丢失问题
     * @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;
}

问题

jackson2ObjectMapperBuilderCustomizer不生效

主要是重复了

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);
        }
}

来源：https://blog.csdn.net/Nightliar/article/details/82351963