無法從給定的URL返回任何響應數據

-3

我可以從相同的代碼檢索JSON數據，但無法從此URL檢索數據，爲什麼這不會返回任何響應代碼或沒有與任何數據響應。請幫我解決這個問題，或者建議我如何從網頁中檢索非JSON數據。無法從給定的URL返回任何響應數據

URL uniprotFasta = new URL(ur); 
    url = "http://www.uniprot.org/uniprot/P69905.fasta"; 

URL uniprotFasta = new URL(ur); 
HttpURLConnection conn = (HttpURLConnection) uniprotFasta.openConnection(); 
    conn.connect(); 
    int response = conn.getResponseCode(); 
    Log.e("Response Code * *", String.valueOf(response)); 
    InputStream is = conn.getInputStream(); 
    // Convert the InputStream into a string 
    String contentAsString = readIt(is, 500); 
    Log.e("HTTPURLCON * *",contentAsString);

我也試過這個，但沒有收到任何迴應。

String data = ""; 
URLConnection conn = uniprotFasta.openConnection(); 
BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream())); 
String line = ""; 
while((line = reader.readLine()) != null){ 
    data += line; 
} 
Log.e("DATA * *",data);

來源

2016-02-08 Akash

好吧，我已經試過這個給你。

寫你的代碼在Asyntask。

public class TestUrl extends AsyncTask<Void, Void, Void> { 

@Override 
protected Void doInBackground(Void... params) { 
    String url = "http://www.uniprot.org/uniprot/P69905.fasta"; 
    HttpURLConnection conn = null; 
    InputStream is = null; 
    try { 
     URL uniprotFasta = new URL(url); 
     conn = (HttpURLConnection) uniprotFasta.openConnection(); 
     conn.connect(); 
     int response = conn.getResponseCode(); 
     Log.e("Response Code * *", String.valueOf(response)); 
     is = conn.getInputStream(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 
    // Convert the InputStream into a string 
    String contentAsString = convertStreamToString(is); 
    Log.e("HTTPURLCON * *", contentAsString); 

    return null; 
}

功能，將輸入流轉換爲字符串

private String convertStreamToString(InputStream is) { 
BufferedReader reader = new BufferedReader(new InputStreamReader(is)); 
StringBuilder sb = new StringBuilder(); 

String line = null; 
try { 
    while ((line = reader.readLine()) != null) { 
     sb.append(line).append('\n'); 
    } 
} catch (IOException e) { 
    e.printStackTrace(); 
} finally { 
    try { 
     is.close(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 
} 
return sb.toString();

}

給予許可清單文件

<uses-permission android:name="android.permission.INTERNET" />

執行的AsyncTask將運行中的代碼後臺線程。
```
new TestUrl().execute(); 
```

迴應，你會得到的是

E/Response Code * *: 200 
E/HTTPURLCON * *: >sp|P69905|HBA_HUMAN Hemoglobin subunit alpha OS=Homo sapiens GN=HBA1 PE=1 SV=2 
      MVLSPADKTNVKAAWGKVGAHAGEYGAEALERMFLSFPTTKTYFPHFDLSHGSAQVKGHG 
      KKVADALTNAVAHVDDMPNALSALSDLHAHKLRVDPVNFKLLSHCLLVTLAAHLPAEFTP 
      AVHASLDKFLASVSTVLTSKYR

我希望這會幫助你。

來源

2016-02-08 12:51:41

代碼達到嘗試阻止，但無法運行openConnection（），這就是爲什麼它再次打印什麼，你認爲這裏有什麼不對。 – Akash

你有沒有在設備上檢查過你的網絡連接？ –

寫下你的異常日誌。 –

//you Should Declare Header type , Content 

public static void main(String[] args) { 

    String urlService="http://www.uniprot.org/uniprot/P69905.fasta"; 
    DefaultHttpClient httpClient = new DefaultHttpClient(); 
    HttpPost httpPost = new HttpPost(urlService); 

    try { 

     httpPost.setHeader("Accept", "application/json"); 
     httpPost.setHeader("Content-type", "application/json"); 
     HttpResponse httpResponse = httpClient.execute(httpPost); 
     String result = EntityUtils.toString(httpResponse.getEntity()); 
     httpClient.getConnectionManager().shutdown(); 
     System.out.println(result); 
    } catch (Exception e) { 
     System.out.println("Exception" +e); 
    } 
}

來源

2016-02-08 12:42:22 koutuk

無法從給定的URL返回任何響應數據

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