Java通过ftp上传文件零字节错误

Question

我将文件上传到服务器，但文件为空。(大小为零字节)

     int reply;
         ftp.connect(server,215);
         ftp.login(username, Password);
         System.out.println("Connected to " + server + ".");
         System.out.print(ftp.getReplyString());
         reply = ftp.getReplyCode();
         if(!FTPReply.isPositiveCompletion(reply)) {
                ftp.disconnect();
                System.err.println("FTP server refused connection.");
         }
         System.out.println("FTP server connected.");
          ftp.setFileType(FTP.BINARY_FILE_TYPE);
          ftp.enterLocalPassiveMode();

         InputStream input= new FileInputStream(source_file_path);

         ftp.storeFile(dest_dir, input);
         System.out.println(ftp.storeFile(dest_dir, input));
         System.out.println( ftp.getReplyString() );

                            input.close();

                            ftp.logout();

Answer 1

查看您的代码，我认为您正在使用 Jakarta commons net。如果这是真的，请尝试以下操作:

ftp.connect(address, port);
boolean ft = ftp.setFileType(FTPClient.BINARY_FILE_TYPE);
if(!ft)
    throw new Exception("Error");
ftp.enterLocalPassiveMode(); or ftp.enterLocalActiveMode();
boolean log = ftp.login(user, password);
//if log == true, then u are logged in
ftp.storeFile(remote, local);

此外，如果您想使用进度条来获取传输进度，您可以尝试此方法而不是 ftp.storeFile

InputStream stO = new BufferedInputStream(new FileInputStream(file), ftp.getBufferSize());
OutputStream stD = ftp.storeFileStream(file.getName());

                    org.apache.commons.net.io.Util.copyStream(
                    stO,
                    stD,
                    ftp.getBufferSize(),
                    file.length(),
                    new org.apache.commons.net.io.CopyStreamAdapter() 
                    {
                        @Override
                        public void bytesTransferred(long totalBytesTransferred, int bytesTransferred,
                                long streamSize) 
                        {
                            try
                            {
                                pb.setMaximum((int)streamSize);
                                pb.setValue((int)totalBytesTransferred);
                            }
                            catch(Exception ex)
                            {
                                pb.setMaximum(-1);
                            }
                        }
                    });
                    stO.close();
                    stD.close();
                    boolean ok = ftp.completePendingCommand();
                    if(!ok)
                        throw new Exception("ERROR while sending the file");

PS:pb是一个JProgressBar