在啟動(dòng)類@SpringBootApplication添加如下：

/**
* fastjson替換默認(rèn)的jackjson(springmvc)
* @return
*/
@Bean
public HttpMessageConverters fastJsonHttpMessageConverters() {
        
        FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter();
        FastJsonConfig fastJsonConfig = new FastJsonConfig();
        fastJsonConfig.setSerializerFeatures(SerializerFeature.WriteMapNullValue, 
                                            SerializerFeature.WriteNullListAsEmpty);
        fastJsonHttpMessageConverter.setFastJsonConfig(fastJsonConfig);

        // 處理中文亂碼問(wèn)題
        List<MediaType> fastMediaTypes = new ArrayList<>();
        fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);
        fastJsonHttpMessageConverter.setSupportedMediaTypes(fastMediaTypes);
        
        HttpMessageConverter<?> converter = fastJsonHttpMessageConverter;
        return new HttpMessageConverters(converter);
}