Android HTTPS 异常连接由对等方重置

Question

我正在开发一个从 Web 服务器下载数据的应用程序。一开始下载数据似乎没有任何问题，但几天前我开始收到这种异常:javax.net .ssl.SSLException: Read error: ssl=0x7a6588: I/O error during system call, Connection reset by peer 我不确定是什么原因导致了这个问题，我该如何解决。这是整个 LogCat 消息:

12-12 11:43:27.950: W/System.err(22010): javax.net.ssl.SSLException: Read error: ssl=0x7a6588: I/O error during system call, Connection reset by peer
12-12 11:43:27.960: W/System.err(22010):    at org.apache.harmony.xnet.provider.jsse.NativeCrypto.SSL_read(Native Method)
12-12 11:43:27.960: W/System.err(22010):    at org.apache.harmony.xnet.provider.jsse.OpenSSLSocketImpl$SSLInputStream.read(OpenSSLSocketImpl.java:788)
12-12 11:43:27.960: W/System.err(22010):    at org.apache.harmony.luni.internal.net.www.protocol.http.ChunkedInputStream.read(ChunkedInputStream.java:50)
12-12 11:43:27.960: W/System.err(22010):    at java.io.InputStream.read(InputStream.java:157)
12-12 11:43:27.960: W/System.err(22010):    at java.util.zip.InflaterInputStream.fill(InflaterInputStream.java:225)
12-12 11:43:27.960: W/System.err(22010):    at java.util.zip.InflaterInputStream.read(InflaterInputStream.java:178)
12-12 11:43:27.960: W/System.err(22010):    at java.util.zip.GZIPInputStream.read(GZIPInputStream.java:174)
12-12 11:43:27.960: W/System.err(22010):    at java.io.BufferedInputStream.read(BufferedInputStream.java:319)
12-12 11:43:27.970: W/System.err(22010):    at java.io.FilterInputStream.read(FilterInputStream.java:133)
12-12 11:43:27.970: W/System.err(22010):    at com.stampii.stampii.synchronization.Synchronization.UseHttpsConnection(Synchronization.java:1367)
12-12 11:43:27.970: W/System.err(22010):    at com.stampii.stampii.synchronization.Synchronization$ActivateCollection.doInBackground(Synchronization.java:613)
12-12 11:43:27.970: W/System.err(22010):    at com.stampii.stampii.synchronization.Synchronization$ActivateCollection.doInBackground(Synchronization.java:1)
12-12 11:43:27.970: W/System.err(22010):    at android.os.AsyncTask$2.call(AsyncTask.java:185)
12-12 11:43:27.970: W/System.err(22010):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
12-12 11:43:27.970: W/System.err(22010):    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
12-12 11:43:27.970: W/System.err(22010):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
12-12 11:43:27.970: W/System.err(22010):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
12-12 11:43:27.970: W/System.err(22010):    at java.lang.Thread.run(Thread.java:1027)

这是我在 UseHttpsConnection 方法上得到的:

    public void UseHttpsConnection(String url, String charset, String query) {

    try {
        final TrustManager[] trustAllCerts = new TrustManager[] { new X509TrustManager() {
            @Override
            public void checkClientTrusted( final X509Certificate[] chain, final String authType ) {
            }
            @Override
            public void checkServerTrusted( final X509Certificate[] chain, final String authType ) {
            }
            @Override
            public X509Certificate[] getAcceptedIssuers() {
                return null;
            }
        } };

        // Install the all-trusting trust manager
        final SSLContext sslContext = SSLContext.getInstance( "TLS" );
        sslContext.init( null, trustAllCerts, new java.security.SecureRandom() );
        // Create an ssl socket factory with our all-trusting manager
        final SSLSocketFactory sslSocketFactory = sslContext.getSocketFactory();

        if (url.startsWith("https://")) {
            HttpsURLConnection.setDefaultHostnameVerifier(new HostnameVerifier(){
                public boolean verify(String hostname, SSLSession session) {
                    return true;
                }});
        }

        System.setProperty("http.keepAlive", "false");
        HttpsURLConnection connection = (HttpsURLConnection) new URL(url).openConnection();
        connection.setSSLSocketFactory( sslSocketFactory );
        connection.setDoOutput(true);
        connection.setConnectTimeout(15000 /* milliseconds */ );
        connection.setRequestMethod("POST");
        connection.setRequestProperty("Charset", charset);
        connection.setRequestProperty("Content-Type","application/x-www-form-urlencoded;charset=" + charset);
        OutputStream output = null;
        try {
            output = connection.getOutputStream();
            output.write(query.getBytes(charset));
        } catch (IOException e) {
            e.printStackTrace();
            showError2("Check your network settings!");

        } finally {
            if (output != null)
                try {
                    output.close();
                } catch (IOException logOrIgnore) {
                    logOrIgnore.printStackTrace();
                }
        }

        int status = ((HttpsURLConnection) connection).getResponseCode();
        Log.d("", "Status : " + status);

        for (Entry<String, List<String>> header : connection
                .getHeaderFields().entrySet()) {
            Log.d("Headers","Headers : " + header.getKey() + "="+ header.getValue());
        }

        InputStream response = new BufferedInputStream(connection.getInputStream());

        int bytesRead = -1;
        byte[] buffer = new byte[30 * 1024];
        while ((bytesRead = response.read(buffer)) > 0) {
            byte[] buffer2 = new byte[bytesRead];
            System.arraycopy(buffer, 0, buffer2, 0, bytesRead);
            handleDataFromSync(buffer2);
        }
        connection.disconnect();
    } catch (IOException e) {
        e.printStackTrace();
        showError2("Synchronization failed!Please try again.");

    } catch (KeyManagementException e) {
        e.printStackTrace();
        showError2("Error occured.Please try again.");

    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
        showError2("Error occured.Please try again.");
    }
}

这是我用来连接和下载数据的 AsyncTask:

    public class DeactivateCollection extends AsyncTask <Context, Integer, Void> {
    @Override
    protected Void doInBackground(Context... arrContext) {
        try {
            String charset = "UTF-8";
            hash = getAuthHash();
            SharedPreferences lastUser = PreferenceManager
                    .getDefaultSharedPreferences(Synchronization.this);
            int userId = lastUser.getInt("lastUser", 1);

            systemDbHelper = new SystemDatabaseHelper(Synchronization.this, null, 1);
            systemDbHelper.initialize(Synchronization.this);
            String sql = "SELECT dbTimestamp FROM users WHERE objectId=" + userId;
            Cursor cursor = systemDbHelper.executeSQLQuery(sql);
            if (cursor.getCount() < 0) {
                cursor.close();
            } else if (cursor.getCount() > 0) {
                cursor.moveToFirst();
                timeStamp = cursor.getString(cursor.getColumnIndex("dbTimestamp"));
                Log.d("", "timeStamp : " + timeStamp);
            }

            String query = String.format("debug_data=%s&"
                    + "client_auth_hash=%s&" + "timestamp=%s&"
                    + "deactivate_collections=%s&" + "client_api_ver=%s&"
                    + "set_locale=%s&" + "device_os_type=%s&"
                    + "device_sync_type=%s&"
                    + "device_identification_string=%s&"
                    + "device_identificator=%s&" + "device_resolution=%s",
                    URLEncoder.encode("1", charset),
                    URLEncoder.encode(hash, charset),
                    URLEncoder.encode(timeStamp, charset),
                    URLEncoder.encode(Integer.toString(deac), charset),
                    URLEncoder.encode(clientApiVersion, charset),
                    URLEncoder.encode(locale, charset),
                    URLEncoder.encode(version, charset),
                    URLEncoder.encode("14", charset),
                    URLEncoder.encode(version, charset),
                    URLEncoder.encode(deviceId, charset),
                    URLEncoder.encode(resolution, charset));

            Log.e("","hash : "+hash);
            Log.e("","deactivate : "+Integer.toString(deac));

            SharedPreferences useSSLConnection = PreferenceManager.getDefaultSharedPreferences(Synchronization.this);
            boolean useSSl = useSSLConnection.getBoolean("UseSSl", true);
            if (useSSl) {
                UseHttpsConnection(url, charset, query);
            } else {
                UseHttpConnection(url, charset, query);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    @Override
    protected void onProgressUpdate(Integer... progress) {
        Log.d("","ON PROGRESS UPDATE");

    }
    @Override
    protected void onCancelled() {
        Log.d("","ON CANCELLED");

    } 
    @Override
    protected void onPreExecute() 
    {
        Log.d("","ON PRE EXECUTE");
    }
    @Override
    protected void onPostExecute(Void v) {
        Log.d("","ON POST EXECUTE");

    }
  }

所以任何人都知道如何处理该异常，这样我就可以毫无异常(exception)地下载整个数据。或者，如果无法解决，我该如何解决。

提前致谢!

Answer 1

实际上，在这种情况下您可以采取两种选择。您可以在通过互联网下载数据时捕获该异常，并创建一个函数，该函数将从停止的地方重新启动连接。所以你必须找到一种方法来在下载数据时保存你的进度，因为如果你正在下载大量数据，那么重新开始这个过程并不是一个好主意。

你可以做的另一件事是创建一个对话框，它会通知用户同步时出错并让他选择是否要重试操作或取消它。如果用户选择重试选项我认为它从再次停止的地方重新开始连接将是一个更好的选择。所以你必须以两种方式保存你的进步。我认为这对用户更友好。