fastjson 在 springboot中的运用

题记： 项目中开始用是Gson,但是压力测试的时候会出现性能下降明显，不得已换成了fastjson

1.首先引用包

 <dependency>
             <groupId>com.alibaba</groupId>
             <artifactId>fastjson</artifactId>
             <version>1.2.41</version>
         </dependency>

2.Application 添加@Bean

 @Bean
     public HttpMessageConverters fastJsonHttpMessageConverters(){
         //1.需要定义一个convert转换消息的对象;
         FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter();
         //2:添加fastJson的配置信息;
         FastJsonConfig fastJsonConfig = new FastJsonConfig();
         fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat);
         //3处理中文乱码问题
         List<MediaType> fastMediaTypes = new ArrayList<>();
         fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);
         //4.在convert中添加配置信息.
         fastJsonHttpMessageConverter.setSupportedMediaTypes(fastMediaTypes);
         fastJsonHttpMessageConverter.setFastJsonConfig(fastJsonConfig);
         HttpMessageConverter<?> converter = fastJsonHttpMessageConverter;
         return new HttpMessageConverters(converter);

     }

3.实体注解写法 @JSONField(format="yyyy-MM-dd HH:mm:ss",name = "createTime")

   @JSONField(format="yyyy-MM-dd HH:mm:ss",name = "createTime")
     private Date createdDate;
     @JSONField(name = "picture")
     private String imageLink;
     @JSONField(name = "playUrl")
     private String mobileFileLink;

4.解析json字符串 {"msgId":"ed3ad9d5-005f-4e37-9f7b-fbaf7323d0ae","version":"2.0","timeStamp":1513233213925,"appId":"cms20001","type":"Article","action":"Delete","priority":"Normal","payload":{"entityid":"b3476954-67b0-474c-a7a7-f5f301dda46b","businessid":"6430523"}}

String t = new String(message,"UTF-8");
JSONObject jsonObj = JSON.parseObject(t)
JSONObject payload = jsonObj.getJSONObject("payload");
long collectionId =  payload.getLong("businessid");

针对array可以用这个

JSONObject jsonObj = new JSONObject(rawText);
JSONArray jsonArray = result .getJSONArray("selList");
for (int i = 0; i < jsonArray.length; i++) {  

}