上传或下载从/到ftp服务器：Android客户端

wgmfuz8q  于 2024-01-04  发布在  Android
关注(0)|答案(3)|浏览(174)

我在android项目上测试FTP功能上传或下载文件。这里是我第一次尝试基于this教程的代码：

  1. public void onCreate(Bundle savedInstanceState) {
  2.     super.onCreate(savedInstanceState);
  3.     setContentView(R.layout.main);
  5.     try {
  6.         SimpleFTP ftp = new SimpleFTP();
  8.         // Connect to an FTP server on port 21.
  9.         ftp.connect("ftp.olympe-network.com", 21, "username", "password");
  11.         // Set binary mode.
  12.         ftp.bin();
  14.         // Change to a new working directory on the FTP server.
  15.         ftp.cwd("web");
  17.         // Upload some files.
  18.         ftp.stor(new File("shirt.jpg"));
  19.         //ftp.stor(new File("comicbot-latest.png"));
  21.         // You can also upload from an InputStream, e.g.
  22.         ftp.stor(new FileInputStream(new File("shirt.jpg")), "shirt.jpg");
  23.         /*ftp.stor(someSocket.getInputStream(), "blah.dat");
  24.         */
  26.         // Quit from the FTP server.
  27.         ftp.disconnect();
  28.     }
  29.     catch (IOException e) {
  30.         // Jibble.
  31.     }
  32. }

字符串
我的shirt.jpg文件存储在主项目文件夹中。我使用的是模拟器而不是物理设备。我的日志中没有错误，但文件没有上传。
然后，我换了另一种方法：

  1. private void loadLogs() {
  2.     //radBtn.addView(null);
  3.     new processTask().execute();
  4. }
  5. private class processTask extends AsyncTask<String, Void, Void>{
  6.     private ProgressDialog Dialog = new ProgressDialog(activitiMain.this);
  7.      private TextView log; 
  8.      private  Spinner s;
  9.     protected void onPreExecute() {
  10.         Dialog.setMessage("Loading...");
  11.         Dialog.show();
  12.     }
  13.     @Override
  14.     protected Void doInBackground(String... arg0) {
  15.         FTPClient client = new FTPClient();
  16.         try {
  17.         SharedPreferences myPref = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
  18.         String ipaddr = myPref.getString("etServer", "");
  19.         String port= myPref.getString("port", "21");
  20.         String logFile= myPref.getString("logfname", "error_log");
  21.         String filePath= myPref.getString("path", "/public_html");
  22.         String uname= myPref.getString("uname", "");
  23.         String pass= myPref.getString("pass", "");
  24.         client.connect(ipaddr,21);
  25.         client.enterLocalPassiveMode();
  26.         boolean login = client.login(uname, pass);
  27.         client.changeWorkingDirectory(filePath);
  28.         System.out.println(client.printWorkingDirectory());
  30.         BufferedReader reader = null;
  31.         String line = null;
  32.         sv = new ScrollView(activitiMain.this);                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
  33.         sv.setLayoutParams(LP_FF);
  34.         LinearLayout loglay  =  new LinearLayout(activitiMain.this);
  35.         loglay.setOrientation( LinearLayout.VERTICAL );  //FTPFile[] ftpFiles = client.listFiles();
  36.         FTPFile[] ftpFiles = client.listFiles();
  37.         ArrayList<String> name = new ArrayList<String>();                              
  38.         ArrayAdapter <CharSequence> adapter =new ArrayAdapter <CharSequence> (getBaseContext(), android.R.layout.simple_spinner_item );
  39.             adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
  41.              adapter.add("Select File");*/      
  42.             //s = new (Spinner)findViewById(R.id.Spinner01);
  43.             s = new Spinner(activitiMain.this);
  44.             for (int i = 0; i < ftpFiles.length; i++) { 
  45.                 String fname =ftpFiles[i].getName();
  46.                 Log.i("FTP", "File " +i +" : "+fname);
  47.                        name.add(fname);
  48.                         long length = ftpFiles[i].getSize();
  49.                         //adapter2.add(ftpFiles[i].getName());
  50.                         //String readableLength = FileUtils.byteCountToDisplaySize( length );
  51.                         ///System.out.println( name + ":\t\t" + readableLength );  
  52.                     }
  53.             //String [] strArray =null;
  54.             //strArray.toArray(name);
  55.             String [] files = name.toArray(new String[name.size()]);
  56.             @SuppressWarnings("unchecked")
  57.             ArrayAdapter<Object> adapter2 = new ArrayAdapter<Object>(getApplicationContext(), android.R.layout.simple_spinner_item,files);  
  58.              adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);  
  59.              s.setAdapter(adapter2);  
  60.              loglay.addView(s);
  62.          Log.i("Files", ftpFiles.toString());
  63.             for (FTPFile ftpFile : ftpFiles) {
  64.                 String fileName = ftpFile.getName(); 
  65.                 if (fileName.equals(logFile)){
  66.                      try {
  67.                          InputStream stream = client.retrieveFileStream(fileName);                             
  68.                          reader = new BufferedReader(new InputStreamReader(stream, "UTF-8"));
  69.                          //line = reader.readLine();
  71.                          while ((line = reader.readLine())!= null && line.trim().length()>0) {
  72.                                 //System.out.println(line);
  73.                              log = new TextView(activitiMain.this);
  74.                                 String trail = line; 
  75.                                 log.setTextColor(Color.GREEN);                                                                                                                                                                                                                                                                                                                                 
  76.                                 log.setPadding(10, 5, 0, 5);
  77.                                 log.setText(trail);                                                                                                                                                                                                                                                                                                                                   
  78.                                 loglay.addView(log);    
  79.                             }
  80.                          sv.addView(loglay);
  81.                      } finally {
  82.                          if (reader != null) try { reader.close(); } catch (IOException logOrIgnore) {}
  83.                      }
  84.                 }
  85.             }
  86.                client.logout();
  88.         } catch (IOException e) {
  89.             e.printStackTrace();
  90.         } finally {
  91.             try {
  92.                 client.disconnect();
  93.             } catch (IOException e) {
  94.                 e.printStackTrace();
  95.             }
  96.         }
  97.         return null;
  98.     }
  99.     protected void onPostExecute(Void unused) {
  100.         Dialog.dismiss();
  101.         setContentView(sv);
  102.         }

型
在我的首选项屏幕中，我指定了ftp服务器参数，但我在logcat中也得到了一个错误：

  1. 05-27 18:36:38.237: ERROR/AndroidRuntime(585): FATAL EXCEPTION: main
  2. 05-27 18:36:38.237: ERROR/AndroidRuntime(585): java.lang.NullPointerException
  3. 05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at android.view.ViewGroup.addViewInner(ViewGroup.java:1969)
  4. 05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at android.view.ViewGroup.addView(ViewGroup.java:1865)
  5. 05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at android.view.ViewGroup.addView(ViewGroup.java:1845)
  6. 05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:217)
  7. 05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:207)
  8. 05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at android.app.Activity.setContentView(Activity.java:1658)
  9. 05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at com.sam.remote.activitiMain$processTask.onPostExecute(activitiMain.java:160)
  10. 05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at com.sam.remote.activitiMain$processTask.onPostExecute(activitiMain.java:1)
  11. 05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at android.os.AsyncTask.finish(AsyncTask.java:417)
  12. 05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at android.os.AsyncTask.access$300(AsyncTask.java:127)
  13. 05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:429)
  14. 05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at android.os.Handler.dispatchMessage(Handler.java:99)
  15. 05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at android.os.Looper.loop(Looper.java:123)
  16. 05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at android.app.ActivityThread.main(ActivityThread.java:4627)
  17. 05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at java.lang.reflect.Method.invokeNative(Native Method)
  18. 05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at java.lang.reflect.Method.invoke(Method.java:521)
  19. 05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
  20. 05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
  21. 05-27 18:36:38.237: ERROR/AndroidRuntime(585):     at dalvik.system.NativeStart.main(Native Method)

型

android

3条答案

按热度按时间
7fyelxc5

7fyelxc51#

看看你的第一次尝试，当你说你的文件shirt.jpg存储在你的主项目文件夹中时，我不认为你的代码会发现一旦部署到设备上，你可能必须手动将该文件存储在设备上，如下所述：
http://developer.android.com/guide/topics/data/data-storage.html#filesInternal
或者你可以先上传shirt.jpg文件（通过ADP）到你的应用程序共享目录，如下所述：
http://developer.android.com/guide/topics/data/data-storage.html#filesExternal
然后尝试读取并通过FTP传输。
哦，是的，也是我的经验与Android上保存文件，然后通过电子邮件发送，使用实际设备进行测试，因为模拟器不提供您所需要的网络连接.

赞(0）分享  回复(0）举报  2024-01-04
inn6fuwd

inn6fuwd2#

private class FtpTask extends AsyncTask<DocumentFile，Void，Void> {

  1. @Override
  2.     protected Void doInBackground(DocumentFile... documentFiles) {
  3.         FTPClient ftpClient = new FTPClient();
  4.         try {
  5.             ftpClient.connect(SERVER);
  6.             ftpClient.login(USERNAME, PASSWORD);
  8.             // Upload the file from the device to the FTP server
  9.             uploadFile(ftpClient, documentFiles[0]);
  10.             isUploadSuccessful = true;
  11.             // Download the file from the FTP server to the app's private files directory
  12.             downloadFile(ftpClient);
  14.             // Disconnect after the upload and download
  15.             ftpClient.disconnect();
  16.         } catch (IOException e) {
  17.             e.printStackTrace();
  18.             showToast("Error: " + e.getMessage());
  19.         }
  20.         return null;
  21.     }
  23.     private void uploadFile(FTPClient ftpClient, DocumentFile pickedFile) throws IOException {
  24.         ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
  25.         ftpClient.enterLocalPassiveMode();
  27.         // Create an InputStream for the picked file
  28.         try (InputStream inputStream = getContentResolver().openInputStream(pickedFile.getUri())) {
  29.             // Specify the remote file name on the server
  30.             ftpClient.storeFile(REMOTE_FILE_NAME, inputStream);
  31.             showToast("File uploaded successfully to: " + REMOTE_FILE_NAME);
  32.         }
  33.     }
  35.     private void downloadFile(FTPClient ftpClient) throws IOException {
  36.         ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
  37.         ftpClient.enterLocalPassiveMode();
  39.         // Specify the remote file name on the server
  40.         String remoteFileName = REMOTE_FILE_NAME;
  42.         // Create an InputStream to read the file from the FTP server
  43.         try (InputStream inputStream = ftpClient.retrieveFileStream(remoteFileName)) {
  44.             if (inputStream != null) {
  45.                 // Save the file to the app's private files directory
  46.                 saveToFile(inputStream);
  47.                 showToast("File downloaded successfully to: " + getFilesDir() + "/" + remoteFileName);
  48.             } else {
  49.                 showToast("Error downloading file: " + ftpClient.getReplyString());
  50.             }
  51.         }
  52.     }

字符串
在代码中使用此代码段
private static final String SERVER =“115.111.229.10“; private static final String USERNAME =“rnd”; private static final String PASSWORD =“rnd 123”;将这些值替换为您的值

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赞(0）分享  回复(0）举报  2024-01-04
aelbi1ox

aelbi1ox3#

在哪一行发生了异常？双击错误信息并再次尝试调试/发布

赞(0）分享  回复(0）举报  2024-01-04
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