public void doGsonTest(View view) {

        //参考文档 http://www.stormzhang.com/android/2014/05/22/android-gson/

        Log.d("lsl","doGsonTest");

        String JSON_DATA = "{\"id\": 101,\"body\": \"It is my post\",\"number\": 0.13,\"created_at\": \"2014-05-22 19:12:38\"}";

        Foo foo = new Gson().fromJson(JSON_DATA, Foo.class);

        LogUtil.d("lsl","id="+foo.id+"body="+foo.body+"number="+foo.number+"created_at="+foo.created_at);

        GsonBuilder gsonBuilder = new GsonBuilder();

        gsonBuilder.setDateFormat("yyyy-MM-dd");

        Gson gson = gsonBuilder.create();

        foo = gson.fromJson(JSON_DATA, Foo.class);

        LogUtil.d("lsl","id="+foo.id+"body="+foo.body+"number="+foo.number+"created_at="+foo.created_at);

        JSON_DATA = "[{\"id\": 102,\"body\": \"It is my post\",\"number\": 0.13,\"created_at\": \"2014-05-22 19:12:38\"},{\"id\": 103,\"body\": \"It is my post\",\"number\": 0.13,\"created_at\": \"2014-05-22 19:12:38\"}]";

        Foo[] foos = new Gson().fromJson(JSON_DATA, Foo[].class);

        List<Foo> foosList = Arrays.asList(foos);

        for(Foo vo : foosList){

            LogUtil.d("lsl","id="+vo.id+"body="+vo.body+"number="+vo.number+"created_at="+vo.created_at);

        }

        LogUtil.d("lsl","============merchandiose=============");

        JSON_DATA = "{\"op_type\": 10002,\"code\": \"0\",\"msg\": \"success\",\"data\":[{\"id\": 104,\"name\": \"apple\",\"kind_name\": \"food\",\"price\": 0.13,\"created_at\": \"2014-05-22 19:12:38\"},{\"id\": 105,\"name\": \"orange\",\"kind_name\": \"food\",\"price\": 0.13,\"created_at\": \"2014-05-22 19:12:38\"}]}";

        MechandiseListModel mObj = new Gson().fromJson(JSON_DATA, MechandiseListModel.class);

        LogUtil.d("lsl","op_type="+mObj.op_type

                +"code="+mObj.code

                +"msg="+mObj.msg

                );

        List<Mechandise> mList = mObj.data;

        for(Mechandise m : mList){

            LogUtil.d("lsl","" +

                    "id="+m.id+"name="+m.name+"kind_name="+m.kind_name+

                    "price="+m.price+"created_at="+m.created_at

                    );

        }

    }

    public class MechandiseListModel {

        public int op_type;

        public int code;

        public String msg;

        List<Mechandise> data;

    }

    public class Mechandise {

        public int id;

        public String name;

        public String kind_name;

        public float price;

        public String created_at;

    }

    public class Foo {

        public int id;

        public String body;

        public float number;

        public String created_at;

    }