如何将文件从 FTP 服务器下载到 Android 设备？
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How to download a file from FTP server to Android device?
提问by Anil kumar
I have a requirement to download a image from FTP server to android device. I tried with few samples by using ftp4j-1.7.2.jarlibrary, but failed to connect with FTP servers& messed up.
我需要将图像从 FTP 服务器下载到 android 设备。我通过使用ftp4j-1.7.2.jar库尝试了几个样本，但无法与 FTP 服务器连接并搞砸了。
Have anyone worked with FTP servers?
有人用过 FTP 服务器吗？
Please suggest to make connection & download file from Server.
请建议从服务器进行连接和下载文件。
回答by Anil Jadhav
Use library commons.apache.org/proper/commons-net
使用库commons.apache.org/proper/commons-net
Check below code to download file from FTP server:
检查以下代码以从 FTP 服务器下载文件：
private Boolean downloadAndSaveFile(String server, int portNumber,
String user, String password, String filename, File localFile)
throws IOException {
FTPClient ftp = null;
try {
ftp = new FTPClient();
ftp.connect(server, portNumber);
Log.d(LOG_TAG, "Connected. Reply: " + ftp.getReplyString());
ftp.login(user, password);
Log.d(LOG_TAG, "Logged in");
ftp.setFileType(FTP.BINARY_FILE_TYPE);
Log.d(LOG_TAG, "Downloading");
ftp.enterLocalPassiveMode();
OutputStream outputStream = null;
boolean success = false;
try {
outputStream = new BufferedOutputStream(new FileOutputStream(
localFile));
success = ftp.retrieveFile(filename, outputStream);
} finally {
if (outputStream != null) {
outputStream.close();
}
}
return success;
} finally {
if (ftp != null) {
ftp.logout();
ftp.disconnect();
}
}
}
