向服务器请求数据:
两种请求方式:GET 与 POST
get一般用于从服务器获取数据,post一般用于向服务器提交数据;
如何通过get获取数据:
注意:在android4.0以后的版本，主线程（UI线程）不在支持网络请求，原因大概是影响主线程，速度太慢，容易卡机，所以需要开启新的线程请求数据；
//HttpUrlConnection /** * 1.实例化一个url对象 * 2.获取HttpUrlConnection对象 * 3.设置请求连接属性 * 4.获取响应码，判断是否连接成功 * 5.读取输入流并解析 */ //参数：你要访问的接口地址 new Thread(){ @Override public void run() { try { URL url = new URL("http://www.imooc.com/api/teacher?type=2"); HttpURLConnection coon = (HttpURLConnection) url.openConnection(); coon.setRequestMethod("GET"); coon.setReadTimeout(6000); //获取响应码 if(coon.getResponseCode() == 200){ //获取输入流 InputStream in = coon.getInputStream(); byte[] b = new byte[1024*512]; int len = 0; //建立缓存流，保存所读取的字节数组 ByteArrayOutputStream baos = new ByteArrayOutputStream(); while ((len = in.read(b)) > -1){ baos.write(b,0,len); } String msg = baos.toString(); }.start
解析json普通数据
解析的数据
{ "status": 1, "data": { "title": "Tony老师聊shell——环境变量配置文件", "author": "Tony", "content": "本课程是《Tony老师聊shell》系列课程的第三篇，为你带来常用的环境变量配置文件的使用。" }, "msg": "成功" }
使用JSONObject解析：
1 //JSON数据的解析： 2 JSONObject obj = new JSONObject(msg); 3 int status = obj.getInt("status"); 4 String msg2 = obj.getString("msg"); 5 Log.e("TAG", status + " " + msg2); 6 //解析data数组先获取data对象 7 JSONObject jsonObject = obj.getJSONObject("data"); 8 String title = jsonObject.getString("title"); 9 String author = jsonObject.getString("author"); 10 String content = jsonObject.getString("content"); 11 Log.e("TAG", "标题：" + title + "，作者：" + author + "，内容：" + content);
使用GSON快速解析数组数据
数据:
1 { 2 "status": 1, 3 "data": [{ 4 "id": 1, 5 "name": "Tony老师聊shell——环境变量配置文件", 6 "picSmall": "http://img.mukewang.com/55237dcc0001128c06000338-300-170.jpg", 7 "picBig": "http://img.mukewang.com/55237dcc0001128c06000338.jpg", 8 "description": "为你带来shell中的环境变量配置文件", 9 "learner": 12312 10 }, { 11 "id": 2, 12 "name": "数学知识在CSS动画中的应用", 13 "picSmall": "http://img.mukewang.com/55249cf30001ae8a06000338-300-170.jpg", 14 "picBig": "http://img.mukewang.com/55249cf30001ae8a06000338.jpg", 15 "description": "数学知识与CSS结合实现酷炫效果", 16 "learner": 45625 17 }, { 18 "id": 3, 19 "name": "Oracle数据库开发必备利器之PL/SQL基础", 20 "picSmall": "http://img.mukewang.com/5523711700016d1606000338-300-170.jpg", 21 "picBig": "http://img.mukewang.com/5523711700016d1606000338.jpg", 22 "description": "Oracle数据库高级开发必备的基础。", 23 "learner": 41236 24 }, { 25 "id": 4, 26 "name": "Android见证消息推送时刻进阶篇", 27 "picSmall": "http://img.mukewang.com/551e470500018dd806000338-300-170.jpg", 28 "picBig": "http://img.mukewang.com/551e470500018dd806000338.jpg", 29 "description": "Android消息推送就在眼前，Come on", 30 "learner": 45456 31 }, { 32 "id": 5, 33 "name": "Avalon探索之旅基础教程——复杂绑定", 34 "picSmall": "http://img.mukewang.com/551de0570001134f06000338-300-170.jpg", 35 "picBig": "http://img.mukewang.com/551de0570001134f06000338.jpg", 36 "description": "前端迷您MVVM框架，Avalon复杂绑定属性篇。", 37 "learner": 56556 38 }, { 39 "id": 6, 40 "name": "Android-Service系列之断点续传下载", 41 "picSmall": "http://img.mukewang.com/552640c300018a9606000338-300-170.jpg", 42 "picBig": "http://img.mukewang.com/552640c300018a9606000338.jpg", 43 "description": "想升职加薪么？本章课程你值得拥有", 44 "learner": 48996 45 }, { 46 "id": 7, 47 "name": "JUnit—Java单元测试必备工具", 48 "picSmall": "http://img.mukewang.com/551b92340001c9f206000338-300-170.jpg", 49 "picBig": "http://img.mukewang.com/551b92340001c9f206000338.jpg", 50 "description": "Java单元测试利器!", 51 "learner": 13210 52 }, { 53 "id": 8, 54 "name": "细说Java多线程之内存可见性", 55 "picSmall": "http://img.mukewang.com/5518c3d7000175af06000338-300-170.jpg", 56 "picBig": "http://img.mukewang.com/5518c3d7000175af06000338.jpg", 57 "description": "用两种方式实现内存可见性", 58 "learner": 15051 59 }, { 60 "id": 9, 61 "name": "CSS动画实用技巧", 62 "picSmall": "http://img.mukewang.com/551b98ae0001e57906000338-300-170.jpg", 63 "picBig": "http://img.mukewang.com/551b98ae0001e57906000338.jpg", 64 "description": "教你使用CSS实现惊艳的动画效果！", 65 "learner": 15210 66 }, { 67 "id": 10, 68 "name": "C++远征之起航篇", 69 "picSmall": "http://img.mukewang.com/550b86560001009406000338-300-170.jpg", 70 "picBig": "http://img.mukewang.com/550b86560001009406000338.jpg", 71 "description": "C++亮点尽在其中", 72 "learner": 84545 73 }], 74 "msg": "成功" 75 }
使用GSON快速获取data数组数据
//1.创建Gson对象 Gson gson = new Gson(); //参数1：满足json对象格式的字符串 String data = obj.getString("data"); //Data实体类用来存放data数组的数据 ArrayList<Data> list = gson.fromJson(data, new TypeToken<ArrayList<Data>>() { }.getType()); for (int i = 0; i < list.size(); i++) { Data a = list.get(i); Log.e(TAG, "id =" + a.getId() + "name=" + a.getName()); }
使用GSON可以快速的获取json数据中数组的数据,而不需要一个一个的获取jsonobject对象,然后再一个一个的获取数据.