Question

我制作了一款小型Android应用，我的第一款应用。其功能之一是将文本报告上传到ftp服务器。我正在使用apache-commons-net。在某些设备上，ftp服务器关闭连接而没有指示。服务器日志为空。下面是执行文件传输的内部类的代码。有四个文件要发送，因此循环。 textViewResult控件用于通知用户传输状态。 1.您是否看到可能导致封闭连接的代码存在明显问题？ 2.＆＃34;连接关闭，没有指示＆＃34;错误并没有真正告诉我任何关于问题真正来源的信息。有没有办法得到更详细的错误？

编辑：已在LG G5，H831，android 7.0上报告问题。在LG H635上，Android 6.0可以毫无问题地工作。

edit2：Stacktrace

Data uploading error:
Connection closed without indication.

 Connection info: 
MOBILE
UMTS
CONNECTED

 Stack Trace:
org.apache.commons.net.ftp.FTP.getReply(FTP.java:324)
org.apache.commons.net.ftp.FTP.getReply(FTP.java:300)
org.apache.commons.net.ftp.FTP.connectAction(FTP.java:438)
org.apache.commons.net.ftp.FTPClient.connectAction(FTPClient.java:962)
org.apache.commons.net.ftp.FTPClient.connectAction(FTPClient.java:950)
org.apache.commons.net.SocketClient._connect(SocketClient.java:244)
org.apache.commons.net.SocketClient.connect(SocketClient.java:202)
com.jimmorr.t9a.t9amagicflux.ReportBattleResults$ConnectFTP.doInBackground(ReportBattleResults.java:555)
com.jimmorr.t9a.t9amagicflux.ReportBattleResults$ConnectFTP.doInBackground(ReportBattleResults.java:510)
android.os.AsyncTask$2.call(AsyncTask.java:304)
java.util.concurrent.FutureTask.run(FutureTask.java:237)
android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
java.lang.Thread.run(Thread.java:761)


private class ConnectFTP extends AsyncTask<String, Void, String> {

        private String resp;
        ProgressDialog progressDialog;

        protected Long doInBackground(String message) {
            return null;
        }

        @Override
        protected String doInBackground(String... strings) {
            if(android.os.Debug.isDebuggerConnected())
                android.os.Debug.waitForDebugger();
            String server = "ftp....";
            int port = 21;
            String user = "user...";
            String pass = "pass...";

            FTPClient ftpClient = new FTPClient();
            try {

                ftpClient.connect(server, port);
                ftpClient.login(user, pass);
                ftpClient.enterLocalPassiveMode();

                boolean success = ftpClient.changeWorkingDirectory("public_ftp/incoming");

                ftpClient.setFileType(FTP.BINARY_FILE_TYPE);


                for (int j = 0; j<2;j++) {

                    for (int k = 0; k < 8; k = k + 2) {

                        OutputStream outputStream1;
                        Log.v(strings[k + 1]+" pass:"+j+" folder change:"+success, strings[k]);
                        outputStream1 = ftpClient.storeFileStream(strings[k + 1]);
                        outputStream1.write(strings[k].getBytes());
                        outputStream1.close();
                        if (j==0) resp = "main files sending :"+ k+"/4";
                        else resp = "backup files sending :"+ k+"/4";


                        if (!ftpClient.completePendingCommand()) {
                            ftpClient.logout();
                            ftpClient.disconnect();
                            System.err.println("File transfer failed.");
                            throw new IOException();
                            //System.exit(1);

                        }

                    }

                    success = ftpClient.changeWorkingDirectory("/public_ftp/back_up");
                    ftpClient.setFileType(FTP.BINARY_FILE_TYPE);

                }
                return resp;



            } catch (Throwable ex) {
                progressDialog.dismiss();
                String str = "Data uploading error:\n" + ex.getMessage();
                textViewResult.setText(str);



            } finally {
                try {
                    if (ftpClient.isConnected()) {
                        ftpClient.logout();
                        ftpClient.disconnect();

                    }
                    return null;
                } catch (java.io.IOException ex) {
                    ex.printStackTrace();
                    Log.e("FTP connection",ex.getMessage());
                }
                return null;
            }




            //return null;
        }

        @Override
        protected void onPostExecute(String result) {
            // execution of result of Long time consuming operation

            progressDialog.dismiss();
        }

        @Override
        protected void onPreExecute() {
            progressDialog = ProgressDialog.show(ReportBattleResults.this,
                    "Sending Battle Report",
                    "sending data");
        }
    }

在某些设备上，ftp连接关闭而没有指示

0 个答案: