如何使用Java从FTP下载文件？ [英] How to download file from FTP using Java?

问题描述

使用这段代码，我总是得到一个空文件。

我该怎么处理它？<​​br>
login 是总是 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（）; 
 
尝试{
 client.connect（myac.cs-server.pro，121）; 
布尔登录= client.login（a3ro，passWordIsSecret）; 
 System.out.println（login）; 
字符串remoteFile1 =myac_20150304.log; 
文件downloadFile1 =新建文件（C：\\ Users \\Aero\\\\\\\\\\\\\\\\\\）; 
 OutputStream outputStream1 = 
 new BufferedOutputStream（new FileOutputStream（downloadFile1））; 
布尔成功= client.retrieveFile（remoteFile1，outputStream1）; 
 System.out.println（成功）; 
 outputStream1.close（）; 
} catch（IOException e）{
 e.printStackTrace（）; 
} finally {
 try {
 client.disconnect（）; 
} catch（IOException e）{
 e.printStackTrace（）; 
} 
} 
} 
} 
  

解决方案使用 FileOutputStream ：

 字符串filename =test.txt; 
 FileOutputStream fos = new FileOutputStream（filename）; 
 client.retrieveFile（/+ filename，fos）; 
  

With this code iI always get a empty file.
What I have to do with it?
login is always true. (ofc, here is not real password)

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();
            }
        }
    }
}

解决方案

Use FileOutputStream:

String filename = "test.txt";
FileOutputStream fos = new FileOutputStream(filename);
client.retrieveFile("/" + filename, fos);

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