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++) {  
   
}