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

1 <dependency>
2             <groupId>com.alibaba</groupId>
3             <artifactId>fastjson</artifactId>
4             <version>1.2.41</version>
5         </dependency>

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2.Application 添加@Bean

 1 @Bean
 2     public HttpMessageConverters fastJsonHttpMessageConverters(){
 3         //1.需要定义一个convert转换消息的对象;
 4         FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter();
 5         //2:添加fastJson的配置信息;
 6         FastJsonConfig fastJsonConfig = new FastJsonConfig();
 7         fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat);
 8         //3处理中文乱码问题
 9         List<MediaType> fastMediaTypes = new ArrayList<>();
10         fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);
11         //4.在convert中添加配置信息.
12         fastJsonHttpMessageConverter.setSupportedMediaTypes(fastMediaTypes);
13         fastJsonHttpMessageConverter.setFastJsonConfig(fastJsonConfig);
14         HttpMessageConverter<?> converter = fastJsonHttpMessageConverter;
15         return new HttpMessageConverters(converter);
16 
17     }

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

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

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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++) {  
   
}