从URL读取Android字符串

Question

即时通讯尝试从我的网站读取字符串。该网站返回与PHP呼应会话ID。我只是想读会话ID之前，我的onCreate与后台作业调用JSON解析方法从

Android JSON Parsing

（）函数。必须有一个简单的函数来从网站读取一个字符串。希望有人能帮助我。 非常感谢

Answer 1

try { 
    URL url = new URL("http://www.vogella.com"); 
    HttpURLConnection con = (HttpURLConnection) url 
    .openConnection(); 
    readStream(con.getInputStream()); 
    } catch (Exception e) { 
    e.printStackTrace(); 
} 



private void readStream(InputStream in) { 
    BufferedReader reader = null; 
    try { 
    reader = new BufferedReader(new InputStreamReader(in)); 
    String line = ""; 
    while ((line = reader.readLine()) != null) { 
     System.out.println(line); 
    } 
    } catch (IOException e) { 
    e.printStackTrace(); 
    } finally { 
    if (reader != null) { 
     try { 
     reader.close(); 
     } catch (IOException e) { 
     e.printStackTrace(); 
     } 
    } 
    } 
} 

参考http://www.vogella.com/tutorials/AndroidNetworking/article.html

Answer 2

试试这个

 public class check extends AsyncTask<String , Void, Integer>{ 
     private ProgressDialog dialog1; 
     protected void onPreExecute() { 
      dialog1 = ProgressDialog.show(currentclass.this, "", "Wait......."); 

     } 

     protected void onPostExecute(Integer feed) { 
      dialog1.dismiss();    
      super.onPostExecute(feed); 
      }  
     protected Integer doInBackground(String... params) { 
      // TODO Auto-generated method stub 
      System.out.println(" do in abckground"); 
      String URL_request = "http://your url"; 
      String response = MyWebService.methodForAsynckTask(URL_request); 
     } 
     } 

调用此为

 new checkUpdateVersion().execute(); 

然后

 public static String methodForAsynckTask(String URL){ 
    try{ 
     String responseMessage = ""; 

    HttpClient httpclient = new DefaultHttpClient(); 
    HttpParams params = httpclient.getParams(); 

    HttpConnectionParams.setConnectionTimeout(params, REGISTRATION_TIMEOUT); 
    HttpConnectionParams.setSoTimeout(params, WAIT_TIMEOUT); 
    ConnManagerParams.setTimeout(params, WAIT_TIMEOUT); 

    HttpGet httpGet = new HttpGet(URL); 
    HttpResponse response = httpclient.execute(httpGet); 
    System.out.println("response forn server :"+response); 
    StatusLine statusLine = response.getStatusLine(); 
    if(statusLine.getStatusCode() == HttpStatus.SC_OK){ 
     ByteArrayOutputStream out = new ByteArrayOutputStream(); 
     response.getEntity().writeTo(out); 
     out.close(); 
     responseMessage = out.toString(); 
     System.out.println("resonse message :"+responseMessage); 
     return responseMessage; 
    } 

    else{ 
     Log.w("HTTP1:",statusLine.getReasonPhrase()); 
     response.getEntity().getContent().close(); 
     throw new IOException(statusLine.getReasonPhrase()); 
    } 

} catch (ClientProtocolException e) { 
    Log.w("HTTP2:",e); 
    responseMessage = e.getMessage(); 
} catch (IOException e) { 
    Log.w("HTTP3:",e); 
    responseMessage = e.getMessage(); 
}catch (Exception e) { 
    Log.w("HTTP4:",e); 
    responseMessage = e.getMessage(); 
} 
    return responseMessage; 

}