下载练习——20140220

 1 public static String getStringFromHttp(String urlAddr)
 2 {
 3         InputStream is = null;
 4         ByteArrayBuffer byteArrayBuffer = new ByteArrayBuffer(1);
 5         try
 6         {
 7             URL url = new URL(urlAddr);
 8             HttpURLConnection conn = (HttpURLConnection) url.openConnection();
 9             if (conn.getResponseCode() != HttpURLConnection.HTTP_OK)
10             {
11                 //连接服务器有异常，给用户提示
12                 return null;
13             }
14             is = conn.getInputStream();
15             int len = 0;
16             byte[] buffer = new byte[1024];
17             while ((len = is.read(buffer)) != -1)
18             {
19                 byteArrayBuffer.append(buffer, 0, len);
20             }
21         }
22         catch (MalformedURLException e)
23         {
24             e.printStackTrace();
25         }
26         catch (IOException e)
27         {
28             e.printStackTrace();
29         }
30         finally
31         {
32             if (is != null)
33             {
34                 try
35                 {
36                     is.close();
37                 }
38                 catch (IOException e)
39                 {
40                     e.printStackTrace();
41                 }
42             }
43         }
44         return new String(byteArrayBuffer.toByteArray());
45 }