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尝试在 android 中使用 ftp4j 从 FTP 下载文件后出现以下错误。

W/System.err: it.sauronsoftware.ftp4j.FTPException [code=426, message= Data connection error.]
12-16 11:29:30.496 22976-23595/  W/System.err:     at it.sauronsoftware.ftp4j.FTPClient.download(FTPClient.java:3484)
12-16 11:29:30.496 22976-23595/  W/System.err:     at it.sauronsoftware.ftp4j.FTPClient.download(FTPClient.java:3276)
12-16 11:29:30.496 22976-23595/  W/System.err:     at it.sauronsoftware.ftp4j.FTPClient.download(FTPClient.java:3181)
12-16 11:29:30.496 22976-23595/  W/System.err:     at  .MainActivity$FTPDownload.doInBackground(MainActivity.java:248)
12-16 11:29:30.496 22976-23595/  W/System.err:     at  .MainActivity$FTPDownload.doInBackground(MainActivity.java:234)
12-16 11:29:30.496 22976-23595/  W/System.err:     at android.os.AsyncTask$2.call(AsyncTask.java:292)
12-16 11:29:30.496 22976-23595/  W/System.err:     at java.util.concurrent.FutureTask.run(FutureTask.java:237)
12-16 11:29:30.496 22976-23595/  W/System.err:     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
12-16 11:29:30.496 22976-23595/  W/System.err:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
12-16 11:29:30.496 22976-23595/  W/System.err:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
12-16 11:29:30.496 22976-23595/  W/System.err:     at java.lang.Thread.run(Thread.java:818)

以下代码我用于从 ftp 下载：

                FTPClient client = new FTPClient();
                client.setAutoNoopTimeout( 30000);
                client.connect(FTP_HOST_DOWNLOAD,FTP_DOWNLOAD_PORT);
                client.setPassive(true);
                client.login(FTP_DOWNLOAD_USER, FTP_PASS_DOWNLOAD);
                client.setType(it.sauronsoftware.ftp4j.FTPClient.TYPE_BINARY);
                Log.d("Dir current",""+client.currentDirectory());

                client.changeDirectory("/Private/testftp");
                Log.d("Dir current",""+client.currentDirectory());
                File file_local = new File(Environment.getExternalStorageDirectory() + File.separator + LOCAL_FILE_DOWNLOAD);
                client.download(FILE_DOWNLOAD, file_local, new MyTransferListener());

错误代码 426 用于主机连接，但正在连接到 FTP。

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