安卓客户端与服务器交互Json数据

---恢复内容开始---

1.首先要定义一个Internet类用于连接服务器

 1 public class Internet {
 2     public static String gethttpresult(String urlStr){
 3         try {
 4             URL url=new URL(urlStr);
 5             HttpURLConnection connect=(HttpURLConnection)url.openConnection();
 6             InputStream input=connect.getInputStream();
 7             BufferedReader in = new BufferedReader(new InputStreamReader(input));
 8             String line = null;
 9             System.out.println(connect.getResponseCode());
10             StringBuffer sb = new StringBuffer();
11             while ((line = in.readLine()) != null) {
12                 sb.append(line);
13             }
14             return sb.toString();
15         } catch (Exception e) {
16             System.out.println(e.toString());
17             return null;
18         }
19     }
20 }

2.定义一个JsonParser类用于解析Json数据

 1 public class JSONParser {
 2     static InputStream is = null;
 3     static JSONArray jObj = null;
 4     static String json = "";
 5     // constructor
 6     public JSONParser() {
 7     }
 8     public JSONArray makeHttpRequest(final String url, String method, final List<NameValuePair> params) {
 9         // Making HTTP request
10         new Thread(){
11             @Override
12             public void run() {
13                 try {
14                     //使用POST请求
15                     DefaultHttpClient httpClient = new DefaultHttpClient();
16                     HttpPost httpPost = new HttpPost(url);
17                     httpPost.setEntity(new UrlEncodedFormEntity(params,HTTP.UTF_8));
18                     HttpResponse httpResponse = httpClient.execute(httpPost);
19                     HttpEntity httpEntity = httpResponse.getEntity();
20                     is = httpEntity.getContent();
21                 } catch (UnsupportedEncodingException e) {
22                     e.printStackTrace();
23                 } catch (ClientProtocolException e) {
24                     e.printStackTrace();
25                 } catch (IOException e) {
26                     e.printStackTrace();
27                 }
28                 try {
29                     BufferedReader reader = new BufferedReader(new InputStreamReader(
30                             is, "UTF-8"));
31                     StringBuilder sb = new StringBuilder();
32                     String line = null;
33                     while ((line = reader.readLine()) != null) {
34                         sb.append(line + "\n");
35                     }
36                     is.close();
37                     json = sb.toString();
38                 } catch (Exception e) {
39                     Log.e("Buffer Error", "Error converting result " + e.toString());
40                     Log.d("json", json.toString());
41                 }
42             }
43         }.start();
44         return jObj;
45     }
46 }

3.在MainActivity中获取并解析获取到的Json数据

 1       private Internet internet;       
 2  //将服务器上的图片加载到本地
 3         new Thread() {
 4             @Override
 5             public void run() {
 6                 String result = internet.gethttpresult(url);
 7                 try {
 8                     JSONObject result_json = new JSONObject(result);
 9                     JSONArray person = result_json.getJSONArray("data");
10                     for (int i = 0; i < person.length(); i++) {
11                         JSONObject object = person.getJSONObject(i);
12                         String urL = object.getString("image");
13                         String newPicture=getString(urL);
14                         picture.add(newPicture);
15                         lastUrl.add(urL);
16                     }
17                     //这里可以添加你所需要的操作
18                     //处理完成后给handler发送消息
19                     Message msg = new Message();
20                     msg.what = COMPLETED;
21                     handler.sendMessage(msg);
22                 } catch (JSONException e) {
23                     e.printStackTrace();
24                     System.out.println(e.toString());
25                     Looper.prepare();
26                     Toast.makeText(LoadBmpFeatureActivity.this, "文件解析错误！", Toast.LENGTH_SHORT).show();
27                     Looper.loop();
28                 }
29             }
30         }.start();

获取到的Json格式如下

 

posted @ 2019-05-21 13:24  sq_9701  阅读(434)  评论(0)    收藏  举报