Android 开发工具类 25_getJSON

 1 import java.io.InputStream;
 2 import java.net.HttpURLConnection;
 3 import java.net.URL;
 4 import java.util.ArrayList;
 5 import java.util.List;
 6 
 7 import org.json.JSONArray;
 8 import org.json.JSONObject;
 9 
10 import com.wangjialin.internet.json.domain.News;
11 import com.wangjialin.internet.json.utils.StreamTool;
12 
13 public class NewsService {
14     
15     /**
16      * 获取最新视频资讯
17      * @return
18      * @throws Exception
19      */
20     public static List<News> getJSONLastNews() throws Exception{
21         
22         String path = "http://192.168.1.103:8080/ServerForJSON/NewsListServlet";
23         HttpURLConnection conn = (HttpURLConnection) new URL(path).openConnection();
24         conn.setConnectTimeout(5000);
25         conn.setRequestMethod("GET");
26         
27         if(conn.getResponseCode() == 200){
28             InputStream json = conn.getInputStream();
29             return parseJSON(json);
30         }
31         return null;
32     }
33     
34     private static List<News> parseJSON(InputStream jsonStream) throws Exception{
35         
36         List<News> list = new ArrayList<News>();
37         byte[] data = StreamTool.read(jsonStream);
38         String json = new String(data);
39         JSONArray jsonArray = new JSONArray(json);
40         
41         for(int i = 0; i < jsonArray.length() ; i++){
42             JSONObject jsonObject = jsonArray.getJSONObject(i);
43             int id = jsonObject.getInt("id");
44             String title = jsonObject.getString("title");
45             int timelength = jsonObject.getInt("timelength");
46             list.add(new News(id, title, timelength));
47         }
48         return list;
49     }
50 }

 1 import java.io.ByteArrayOutputStream;
 2 import java.io.InputStream;
 3 
 4 public class StreamTool {
 5     /**
 6      * 从流中读取数据
 7      * @param inStream
 8      * @return
 9      */
10     public static byte[] read(InputStream inStream) throws Exception{
11         
12         ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
13         byte[] buffer = new byte[1024];
14         int len = 0;
15         
16         while((len = inStream.read(buffer)) != -1){
17             outputStream.write(buffer, 0, len);
18         }
19         
20         inStream.close();
21         return outputStream.toByteArray();
22     }
23 }

 1 public class MainActivity extends Activity {
 2     /** Called when the activity is first created. */
 3     List<News> newes;
 4     List<HashMap<String, Object>> data = null;;
 5     String length;
 6     
 7     @Override
 8     public void onCreate(Bundle savedInstanceState) {
 9         super.onCreate(savedInstanceState);
10         
11         setContentView(R.layout.main);
12         ListView listView = (ListView) this.findViewById(R.id.listView);
13         
14         length = this.getResources().getString(R.string.length);
15         
16         try{
17             newes = NewsService.getJSONLastNews();
18             data = new ArrayList<HashMap<String,Object>>();
19             for(News news : newes){
20                 HashMap<String, Object> item = new HashMap<String, Object>();
21                 item.put("id", news.getId());
22                 item.put("title", news.getTitle());
23                 item.put("timelength", length + news.getTimelength());
24                 data.add(item);
25             }                
26         
27             SimpleAdapter adapter = new SimpleAdapter(this, 
28                     data, R.layout.item,
29                     new String[]{"title", "timelength"}, 
30                     new int[]{R.id.title, R.id.timelength}
31             );
32             listView.setAdapter(adapter);        
33         }catch(Exception e)
34         {
35             e.printStackTrace();
36         };
37     }
38 }