由于有第三方框架的存在,从服务器获取Json数据以及解析变得非常非常的简单。
第一个第三方框架是xUtils的HttpUtils:
在Global包中定义了一些全局静态变量类,用于储存访问路径,在这里电脑分配给我模拟器的IP为:192.168.56.1:8080
则路径定义是:
package com.example.zhihuibj.global; public class GlobalContants { public static final String SERVICE_URL="http://192.168.56.1:8080/zhbj/"; public static final String CATEGORIES_URL=SERVICE_URL+"categories.json";//获取分类信息 }
/* * 获取网络数据 */ private void GetDataFromService() { HttpUtils utils=new HttpUtils(); utils.send(HttpMethod.GET, GlobalContants.CATEGORIES_URL, new RequestCallBack<String>() { @Override public void onSuccess(ResponseInfo<String> responseInfo) { String result= responseInfo.result; System.out.println("返回结果"+result); parseData(result); } @Override public void onFailure(HttpException error, String msg) { Toast.makeText(mAcitivty, msg, Toast.LENGTH_SHORT).show(); error.printStackTrace(); System.out.println("解析错误!!!"); } }); }
获取数据就是这么简单。
对于数据的解析使用Google提供的 Jar包: gson-2.3.1.jar
这个jar包提供了一个只需要传入用于储存Json数据的自定义类,即可自动完成所有数据的解析。
下面是服务器端的Json数据:
{ "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 }
对于这个数据自定义一个储存类,以C语言的角度来讲,就是用一个结构体来储存数据:
package com.example.zhihuibj.domain; import java.util.ArrayList; /* * 网络分类信息封装 * * 字段必须和服务器返回的字段相同,方便gson解析 */ public class NewsData { public int retcode; public ArrayList<NewsMenuData> data; public class NewsMenuData{ @Override public String toString() { return "NewsMenuData [id=" + id + ", title=" + title + ", type=" + type + ", url=" + url + ", children=" + children + "]"; } public String id; public String title; public int type; public String url; //public String url1; public ArrayList<NewsTabData> children; } public class NewsTabData{ public String id; public String title; public int type; public String url; } }
/* * 解析网络数据 */ protected void parseData(String result) { Gson gson =new Gson(); NewsData data = gson.fromJson(result, NewsData.class);//直接填入类名 System.out.println("解析结果"+data); }