fastjson使用技巧整理

一、关于fastjson生成和解析json数据

常用的四种类型：JavaBean,List,List,List

1.1 fastjson生成json字符串统一使用

     String jsonStrng = JSON.toJSONString(object);

1.2 fastjson解析json字符串的四种类型

1. JavaBean

          Person person = JSON.parseObject(jsonString, Person.class);

      2. List

          List listPerson =JSON.parseArray(jsonString, Person.class);

      3. List

          List listString = JSON.parseArray(jsonString, String.class);

      4. List>

          List> listMap = JSON.parseObject(jsonString, new TypeReference>>(){});  (注意：此处可看出fastjson反射机制比gson更准确， id = 1001 通过fastjson反射仍是 id = 1001 , 而通过gson反射结果 为 id =1001.0 

1.3 遍历JSONArray

JSONArray ownerArray = object.getJSONArray("appmanager");
        if (null == ownerArray || ownerArray.size() == 0) { return null; }

        String empId = "";
        for (int i = 0; i < ownerArray.size(); i++) {
            JSONObject ownerObj = ownerArray.getJSONObject(i);
            if (null == ownerObj) { continue; }
        }