如何使用Java从FTP下载文件?
使用此代码,我总是得到一个空文件。
我和它有什么关系?
login
始终是true
。 (ofc,这里不是真正的密码)
import org.apache.commons.net.ftp.FTPClient; import org.apache.commons.net.ftp.FTPFile; import java.io.*; public class Logs { public static void main(String[] args) { FTPClient client = new FTPClient(); try { client.connect("myac.cs-server.pro", 121); boolean login = client.login("a3ro", "passWordIsSecret"); System.out.println(login); String remoteFile1 = "myac_20150304.log"; File downloadFile1 = new File("C:\\Users\\Aero\\Desktop\\test\\myac.log"); OutputStream outputStream1 = new BufferedOutputStream(new FileOutputStream(downloadFile1)); boolean success = client.retrieveFile(remoteFile1, outputStream1); System.out.println(success); outputStream1.close(); } catch (IOException e) { e.printStackTrace(); } finally { try { client.disconnect(); } catch (IOException e) { e.printStackTrace(); } } } }
使用这样的东西:
InputStream inputStream = client.retrieveFileStream(remoteFileNameHere);
检索远程文件输入流。
然后,您可以使用将流复制到所需的文件:
FileOutputStream out = new FileOutputStream(targetFile); org.apache.commons.io.IOUtils.copy(in, out);
使用FileOutputStream
:
String filename = "test.txt"; FileOutputStream fos = new FileOutputStream(filename); client.retrieveFile("/" + filename, fos);