[英]Download a files from FTP matching a wildcard using Java Apache Commons Net
基本上我需要從 FTP 服務器下載匹配文件列表以進行搜索。 我有從 FTP 服務器下載特定文件的代碼。 但是我需要使用通配符搜索下載所有匹配的文件。 這在Java中怎么可能?
這是從 FTP 服務器下載特定文件名的文件的代碼 -
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;
public class FTPDownloadFileDemowithoutmodandfilefilter {
public static void main(String[] args) {
String server = "test.rebex.net";
int port = 21;
String user = "demo";
String pass = "password";
FTPClient ftpClient = new FTPClient();
try {
ftpClient.connect(server, port);
ftpClient.login(user, pass);
ftpClient.enterLocalPassiveMode();
ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
File localFile = new File("C:\\project\\readme1.txt");
FTPFile remoteFile = ftpClient.mdtmFile("/readme.txt");
if (remoteFile != null)
{
OutputStream outputStream =
new BufferedOutputStream(new FileOutputStream(localFile));
if (ftpClient.retrieveFile(remoteFile.getName(), outputStream))
{
System.out.println("File downloaded successfully.");
}
outputStream.close();
localFile.setLastModified(remoteFile.getTimestamp().getTimeInMillis());
}
} catch (IOException ex) {
System.out.println("Error: " + ex.getMessage());
ex.printStackTrace();
} finally {
try {
if (ftpClient.isConnected()) {
ftpClient.logout();
ftpClient.disconnect();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
}
使用FTPClient.mlistDir
(推薦,如果服務器支持它)或FTPClient.listFiles
來檢索文件列表。 然后根據您的需要過濾它們。
以下示例下載與正則表達式.*\\.jpg
匹配的所有文件:
FTPFile[] remoteFiles = ftpClient.listFiles(remotePath);
Pattern pattern = Pattern.compile(".*\\.jpg");
Stream<FTPFile> matchingFiles =
Arrays.stream(remoteFiles).filter(
(FTPFile remoteFile) -> pattern.matcher(remoteFile.getName()).matches());
for (Iterator<FTPFile> iter = matchingFiles.iterator(); iter.hasNext(); ) {
FTPFile remoteFile = iter.next();
System.out.println("Found file " + remoteFile.getName() + ", downloading ...");
File localFile = new File(localPath + "\\" + remoteFile.getName());
OutputStream outputStream = new BufferedOutputStream(new FileOutputStream(localFile));
if (ftpClient.retrieveFile(remotePath + "/" + remoteFile.getName(), outputStream))
{
System.out.println("File " + remoteFile.getName() + " downloaded successfully.");
}
outputStream.close();
}
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