String str = "[{'name':'hello',age:'21'},{'name':'hello2',age:'22'},{'name':'hello3',age:'23'}]";
JSONArray jsonArray = JSONArray.fromObject(str);
List list = new ArrayList();
for ( int i = 0 ; i<jsonArray.size(); i++){          
	JSONObject jsonObject = jsonArray.getJSONObject(i);
	TestUserVo vo = (testUserVo) JSONObject.toBean(jsonObject,TestUserVo.class);
	 System.out.println(vo.getAge());
	 list.add(vo);	            
}