GSON

{
    "data": [
        {
            "children": [
                {
                    "id": 10007,
                    "title": "北京",
                    "type": 1,
                    "url": "/10007/list_1.json"
                },
                {
                    "id": 10006,
                    "title": "中国",
                    "type": 1,
                    "url": "/10006/list_1.json"
                },
                {
                    "id": 10008,
                    "title": "国际",
                    "type": 1,
                    "url": "/10008/list_1.json"
                },
                {
                    "id": 10010,
                    "title": "体育",
                    "type": 1,
                    "url": "/10010/list_1.json"
                },
                {
                    "id": 10091,
                    "title": "生活",
                    "type": 1,
                    "url": "/10091/list_1.json"
                },
                {
                    "id": 10012,
                    "title": "旅游",
                    "type": 1,
                    "url": "/10012/list_1.json"
                },
                {
                    "id": 10095,
                    "title": "科技",
                    "type": 1,
                    "url": "/10095/list_1.json"
                },
                {
                    "id": 10009,
                    "title": "军事",
                    "type": 1,
                    "url": "/10009/list_1.json"
                },
                {
                    "id": 10093,
                    "title": "时尚",
                    "type": 1,
                    "url": "/10093/list_1.json"
                },
                {
                    "id": 10011,
                    "title": "财经",
                    "type": 1,
                    "url": "/10011/list_1.json"
                },
                {
                    "id": 10094,
                    "title": "育儿",
                    "type": 1,
                    "url": "/10094/list_1.json"
                },
                {
                    "id": 10105,
                    "title": "汽车",
                    "type": 1,
                    "url": "/10105/list_1.json"
                }
            ],
            "id": 10000,
            "title": "新闻",
            "type": 1
        },
        {
            "id": 10002,
            "title": "专题",
            "type": 10,
            "url": "/10006/list_1.json",
            "url1": "/10007/list1_1.json"
        },
        {
            "id": 10003,
            "title": "组图",
            "type": 2,
            "url": "/10008/list_1.json"
        },
        {
            "dayurl": "",
            "excurl": "",
            "id": 10004,
            "title": "互动",
            "type": 3,
            "weekurl": ""
        }
    ],
    "extend": [
        10007,
        10006,
        10008,
        10014,
        10012,
        10091,
        10009,
        10010,
        10095
    ],
    "retcode": 200
}

JSON数据如上 现在用Gson对上面的复杂数据进行解析 先建立JAVABEAN对象 来封装:

 gson对象封装原则:
* 遇到{}就是一个对象
* 遇到[]就是一个Arraylist
* 对象中所有属性命名必须和服务器返回字段完全一致

 

所以上面的been应该这么写:

 

public class NewsMenuData {

    public int retcode;
    public ArrayList<String> extend;
    public ArrayList<NewsData> data;

    public class NewsData {
        public String id;
        public String title;
        public int type;
        public ArrayList<NewsTabData> children;
        
        @Override
        public String toString() {
            return "NewsData [title=" + title + ", children=" + children + "]";
        }
    }

    // 页签信息封装
    public class NewsTabData {
        public String id;
        public String title;
        public String url;
        public int type;
        
        @Override
        public String toString() {
            return "NewsTabData [title=" + title + "]";
        }
    }

    @Override
    public String toString() {
        return "NewsMenuData [data=" + data + "]";
    }
}

 

 

请求数据:用的xutils框架.

private void getDataFromServer() {
        HttpUtils utils = new HttpUtils();
        utils.send(HttpMethod.GET, Constants.CATEGORIES_URL,
                new RequestCallBack<String>() {

                    @Override
                    public void onSuccess(ResponseInfo<String> responseInfo) {
                        // 请求成功
                        String result = responseInfo.result;// 获取json字符串
                        // System.out.println("result:" + result);
                        processResult(result);
                        // 写缓存
                        CacheUtils.setCache(Constants.CATEGORIES_URL, result,
                                mActivity);
                    }

                    @Override
                    public void onFailure(HttpException error, String msg) {
                        // 请求失败
                        error.printStackTrace();
                        Toast.makeText(mActivity, msg, Toast.LENGTH_SHORT)
                                .show();
                    }
                });
    }

 

Gson解析的方法

    protected void processResult(String result) {
        // gson->json
        Gson gson = new Gson();
        mNewsMenuData = gson.fromJson(result, NewsMenuData.class);
        System.out.println("解析结果:" + mNewsMenuData);
}