fastjson常用方法

       // 用户组对象转JSON串   
        String jsonString = JSON.toJSONString(group);  
        System.out.println("jsonString:" + jsonString);  

//JSON串转对象
        UserGroup group2 = JSON.parseObject(jsonString, UserGroup.class);  
        System.out.println("group2:" + group2);  

        User[] users = new User[2];  
        users[0] = guestUser;  
        users[1] = rootUser;  
        // 用户对象数组转JSON串   
        String jsonString2 = JSON.toJSONString(users);  
        System.out.println("jsonString2:" + jsonString2); 

        // JSON串转用户对象列表   
        List<User> users2 = JSON.parseArray(jsonString2, User.class);  
        System.out.println("users2:" + users2);  

//从json串中获取某个属性
JSONObject.fromObject(json).getString("code");

//解析json为Map
Map<String,Object> map1 = (Map<String,Object>)JSON.parse(result);
for (Map.Entry<String, Object> entry : map1.entrySet()) {
if("success".equals(entry.getKey())&&"true".equals(entry.getValue())){
return true;
}
}
//解析json为Map