SpringCloud : Feign 使用 FastJson 解析数据

本文内容纲要：

Fastjson版本1.2.60

Spring版本5.1.5.RELEASE

SpringBoot版本2.1.5.RELEASE

SpringCloud版本2.1.1.RELEASE

SpringCloud中配置FastJson如下：

@Configuration publicclassFastJsonConverterConfigextendsWebMvcConfigurationSupport{ /** *使用fastjson代替jackson */ @Override protectedvoidextendMessageConverters(List<HttpMessageConverter<?>>converters){ //先把JackSon的消息转换器删除. //(1)源码分析可知，返回json的过程为: //Controller调用结束后返回一个数据对象，for循环遍历conventers，找到支持application/json的HttpMessageConverter，然后将返回的数据序列化成json。 //具体参考org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor的writeWithMessageConverters方法 //(2)由于是list结构，我们添加的fastjson在最后。因此必须要将jackson的转换器删除，不然会先匹配上jackson，导致没使用fastjson for(inti=converters.size()-1;i>=0;i--){ if(converters.get(i)instanceofMappingJackson2HttpMessageConverter){ converters.remove(i); } } //自定义fastjson配置 FastJsonConfigconfig=newFastJsonConfig(); config.setSerializerFeatures( //是否输出值为null的字段,默认为false,我们将它打开 SerializerFeature.WriteMapNullValue, //将Collection类型字段的字段空值输出为[] SerializerFeature.WriteNullListAsEmpty, //将字符串类型字段的空值输出为空字符串 SerializerFeature.WriteNullStringAsEmpty, //将数值类型字段的空值输出为0 SerializerFeature.WriteNullNumberAsZero, SerializerFeature.WriteDateUseDateFormat, //禁用循环引用 SerializerFeature.DisableCircularReferenceDetect ); //添加支持的MediaTypes;不添加时默认为*/*,也就是默认支持全部 //但是MappingJackson2HttpMessageConverter里面支持的MediaTypes为application/json List<MediaType>fastMediaTypes=newArrayList<>(); fastMediaTypes.add(MediaType.APPLICATION_JSON); fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8); FastJsonHttpMessageConverterfastJsonHttpMessageConverter=newFastJsonHttpMessageConverter(); fastJsonHttpMessageConverter.setFastJsonConfig(config); fastJsonHttpMessageConverter.setSupportedMediaTypes(fastMediaTypes); converters.add(fastJsonHttpMessageConverter); //支持XML格式的请求 converters.add(newStringHttpMessageConverter()); } }

但是，在使用Feign的SpringCloud微服务项目中，要特别注意需要为Feign单独配置。因为Feign并不共用SpringMVC的消息转换器链，默认使用的是JacksonJson解析库。

所以需要单独如下配置：

importcom.alibaba.fastjson.JSON; importcom.alibaba.fastjson.serializer.SerializerFeature; importcom.alibaba.fastjson.support.config.FastJsonConfig; importcom.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter; importcom.alibaba.fastjson.support.springfox.SwaggerJsonSerializer; importfeign.Logger; importfeign.codec.Decoder; importfeign.codec.Encoder; importorg.springframework.beans.factory.ObjectFactory; importorg.springframework.boot.autoconfigure.http.HttpMessageConverters; importorg.springframework.cloud.openfeign.support.SpringDecoder; importorg.springframework.cloud.openfeign.support.SpringEncoder; importorg.springframework.context.annotation.Bean; importorg.springframework.context.annotation.Configuration; importorg.springframework.http.MediaType; importjava.util.ArrayList; importjava.util.List; /** *Feign客户端配置 * *@authorxushiling *@date2018/8/13 */ @Configuration publicclassFeignConfig{ @Bean Logger.LevelfeignLoggerLevel(){ //这里记录所有，根据实际情况选择合适的日志level returnLogger.Level.FULL; } @Bean publicEncoderfeignEncoder(){ returnnewSpringEncoder(feignHttpMessageConverter()); } @Bean publicDecoderfeignDecoder(){ returnnewSpringDecoder(feignHttpMessageConverter()); } /** *设置解码器为fastjson * *@return */ privateObjectFactory<HttpMessageConverters>feignHttpMessageConverter(){ finalHttpMessageConvertershttpMessageConverters=newHttpMessageConverters(this.getFastJsonConverter()); return()->httpMessageConverters; } privateFastJsonHttpMessageConvertergetFastJsonConverter(){ FastJsonHttpMessageConverterconverter=newFastJsonHttpMessageConverter(); List<MediaType>supportedMediaTypes=newArrayList<>(); MediaTypemediaTypeJson=MediaType.valueOf(MediaType.APPLICATION_JSON_UTF8_VALUE); supportedMediaTypes.add(mediaTypeJson); converter.setSupportedMediaTypes(supportedMediaTypes); FastJsonConfigconfig=newFastJsonConfig(); config.getSerializeConfig().put(JSON.class,newSwaggerJsonSerializer()); config.setSerializerFeatures(SerializerFeature.DisableCircularReferenceDetect); converter.setFastJsonConfig(config); returnconverter; } }

PS：

https://blog.csdn.net/lppl010_/article/details/94215233

https://www.jianshu.com/p/b3b93a32cb05

本文内容总结：

原文链接：https://www.cnblogs.com/phpdragon/p/12118654.html