java - FTPClient.storeFile() 上传缓慢然后不起作用

Question

Android n00b 试图解决文件服务器上传问题。我在尝试使用 FTPClient 中的 storeFile 方法将文件上传到我在 Android 中的 FTP 服务器时遇到了很多麻烦，在 Galaxy Nexus 上进行了测试。两个问题。首先，它运行得非常非常慢——在代码继续运行之前，对于一个只有几个字节的文件来说，它运行一分钟或更长时间(因此我的显示器经常在运行结束之前进入 hibernate 状态)。其次，完成后没有文件到达服务器。但代码确实继续运行，据我所知，我没有收到任何明确的错误消息告诉我出了什么问题。但第三，在所有这些(和注销)之后，它给了我一个 NullPointerException 并中止了 Activity 。

(还有第四个问题，即使我没有连接，NetworkInfo.getActiveNetworkInfo() 似乎总是返回 CONNECTED，但这似乎无关，我想关注更大的问题。 )

这是我的代码:[Reuse.logIt 是我用来打印到logcat，printToUI 到setText 显示的方法。你可能会说，我正在尝试给自己很多路标来弄清楚发生了什么。]

public void uploadFile(String filename, File theFile)
{

      Reuse.logIt(TAG, "UploadFile did run."); // test that at least    
      FTPClient theClient = new FTPClient();

      // It's probably insecure to do it this way, but first I just want to make it work.
      final String theSite = [the name of my site];
      String username = [my username];
      String password = [my password];


        // get network status
        Context theContext = getApplicationContext();
        ConnectivityManager cMgr = (ConnectivityManager)theContext.getSystemService(Context.CONNECTIVITY_SERVICE);

        NetworkInfo netInfo = cMgr.getActiveNetworkInfo();

        String beginStatus = netInfo.getState().toString();
        // always says CONNECTED whether we're connected or not. 
        String networkStatus = "Network status = "+beginStatus;

        Reuse.logIt(TAG, networkStatus); 

        // pass the network status where it can be displayed in a different window's text. 
        Brouillon instance = (Brouillon) theContext;
        instance.setDataResult(networkStatus);

        if (beginStatus == "CONNECTED")
        // If we don't have a network connection, don't upload the file.
        {

            try
            {               
                theClient.connect(theSite); 

                // When login succeeds, the login method returns true.
                boolean login = theClient.login(username, password); 

                if (login)
                {
                    // success!
                    Reuse.logIt(TAG, "Logged in successfully to "+theSite+"!");
                    printToUI("ftp_connect", "Logged in successfully to "+theSite+"!");

                    Reuse.logIt(TAG, "The code does continue after logging in.");


                    // Now upload the file.
                    String ftpPath = "/brouillon/";
                    String filenameOnFTP = ftpPath+filename;
                    Reuse.logIt(TAG, "It defined the variables.");


                    FileInputStream fis = new FileInputStream(theFile);
                    Reuse.logIt(TAG, "It created the FileInputStream too.");

                    theClient.storeFile(filenameOnFTP, fis);

                    Reuse.logIt(TAG, "We created a file called "+filenameOnFTP+".");
                    printToUI("upload","We created a file called "+filenameOnFTP+".");

                }
                else
                {
                    Reuse.logIt(TAG, "Could not connect to "+theSite+".");
                    printToUI("ftp_connect","Could not connect to "+theSite+".");
                }

                boolean logout = theClient.logout();
                if (logout) 
                {
                    Reuse.logIt(TAG, "Logged out successfully.");
                    printToUI("loggedout","Logged out successfully.");
                }
                else 
                {
                    Reuse.logIt(TAG, "Logout failed!");
                    printToUI("loggedout","Logout failed!");
                }

            }
            catch(IOException e)
            {
                e.printStackTrace(); 
                Reuse.logIt(TAG, "Got error message "+e.toString()+".");

            }
        }
        else
        {
            // For testing purposes, abort the program if not connected. Can change that later.
            Reuse.logIt(TAG, "beginStatus was not CONNECTED!");
            System.exit(0);
        }                   
    }

}

这是我的日志。 (设置为错误模式。如果提供更详细的模式会有帮助，我很乐意这样做，但我首先将其排除在外，因为这会使这篇文章变得很长。)

03-29 13:08:13.400: E/SyncStatus(8764): Sync button pushed.
03-29 13:08:13.400: E/SyncStatus(8764): File created and closed.
03-29 13:08:13.400: E/SyncStatus(8764): UploadFile did run.
03-29 13:08:13.431: E/SyncStatus(8764): Network status = CONNECTED
03-29 13:08:14.556: E/SyncStatus(8764): Logged in successfully to [site name]!
03-29 13:08:14.556: E/SyncStatus(8764): The code does continue after logging in.
03-29 13:08:14.556: E/SyncStatus(8764): It defined the variables.
03-29 13:08:14.556: E/SyncStatus(8764): It created the FileInputStream too.
03-29 13:10:32.283: E/wpa_supplicant(452): android_priv_cmd: failed to issue private commands
03-29 13:11:28.603: E/SyncStatus(8764): We created a file called /brouillon/filename.txt.
03-29 13:11:28.705: E/SyncStatus(8764): Logged out successfully.
03-29 13:11:28.713: E/AndroidRuntime(8764): FATAL EXCEPTION: main
03-29 13:11:28.713: E/AndroidRuntime(8764): java.lang.NullPointerException
03-29 13:11:28.713: E/AndroidRuntime(8764):     at com.loveofallwisdom.brouillon.SyncStatus$2.run(SyncStatus.java:174)
03-29 13:11:28.713: E/AndroidRuntime(8764):     at android.os.Handler.handleCallback(Handler.java:725)
03-29 13:11:28.713: E/AndroidRuntime(8764):     at android.os.Handler.dispatchMessage(Handler.java:92)
03-29 13:11:28.713: E/AndroidRuntime(8764):     at android.os.Looper.loop(Looper.java:137)
03-29 13:11:28.713: E/AndroidRuntime(8764):     at android.app.ActivityThread.main(ActivityThread.java:5041)
03-29 13:11:28.713: E/AndroidRuntime(8764):     at java.lang.reflect.Method.invokeNative(Native Method)
03-29 13:11:28.713: E/AndroidRuntime(8764):     at java.lang.reflect.Method.invoke(Method.java:511)
03-29 13:11:28.713: E/AndroidRuntime(8764):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
03-29 13:11:28.713: E/AndroidRuntime(8764):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
03-29 13:11:28.713: E/AndroidRuntime(8764):     at dalvik.system.NativeStart.main(Native Method)
03-29 13:11:38.931: E/wpa_supplicant(452): android_priv_cmd: failed to issue private commands

Answer 1

请尝试这样做:

public static String uploadOrder(String fileName)
{

    String m;

    FTPClient con = null;

    m = "Conn failed";

    try
    {
       con = new FTPClient();

       con.connect("xxx.xxx.210.176");

       //username and password for ftp server
       if (con.login("ftpxxx@xxxxx", "pass"))
       {
          con.enterLocalPassiveMode();//passive mode - IMPORTANT
          con.setFileType(FTP.ASCII_FILE_TYPE);//only for txt file ACII mode, for rest binary mode
          String data = Environment.getExternalStorageDirectory().getPath() +"/"+ fileName; //data location 
          FileInputStream in = new FileInputStream(data);
          File f = new File(data);          

          con.changeWorkingDirectory("xxxxxx");//        
          if(con.changeWorkingDirectory("Orders"))//
          {
             Log.i("FTP","Got into directory");
          }
          if(!con.changeWorkingDirectory(MainPage.fb_id))//
          {

              in.close();
              con.logout();
              con.disconnect();
              return m;
          }


          if(con.storeFile(fileName, in))
          {               
              m = "Upload success!";
          }
          if(!f.exists()) m = "File not exists.";
          in.close();
          //logging out
          con.logout();
          con.disconnect();
       }
       else 
       {                     
           m = "Unsuccessful";
       }
    }
    catch (Exception e)
    {
          m = e.getMessage();
    }
    return m;
}