java 使用 ftp 上传文件/目录

upload file/directory with ftp

提问by ankit

I have setup openssh server in ububntu machine. I want to upload file and dierctory to ftp server using java api's. So, far i have used two different vendors java api's(jscape, zehon) to upload file/directory.

我在 ububntu 机器上设置了 openssh 服务器。我想使用 java api 将文件和目录上传到 ftp 服务器。所以，到目前为止，我已经使用了两个不同供应商的 java api(jscape, zehon) 来上传文件/目录。

I am able to upload file/directory from local machine to local ftp server. But i am not able to upload from local machine to remote ftp server using api's. But with command line tools like scp or ftp or sftp i am able to upload file/directory from any local machine to remote ftp server.

我能够将文件/目录从本地机器上传到本地 ftp 服务器。但是我无法使用 api 从本地机器上传到远程 ftp 服务器。但是使用 scp 或 ftp 或 sftp 等命令行工具，我可以将文件/目录从任何本地机器上传到远程 ftp 服务器。

I am confused whether i have not installed/configured openssh server properly. or may be i am not able to use (zehon/jscape)java api's correctly.

我很困惑我是否没有正确安装/配置 openssh 服务器。或者我可能无法正确使用 (zehon/jscape)java api。

can u please give me a test code to upoad file and directory using java api.

你能给我一个测试代码来使用java api上传文件和目录吗？

this is the code which i have used to upload file from local machine to remote ftp server. I am using sftp.jar from jscape.

这是我用来将文件从本地机器上传到远程 ftp 服务器的代码。我正在使用 jscape 中的 sftp.jar。

Ftp ftp = new Ftp(hostname,username,password);
ftp.connect();
ftp.setDir(destFolder);
ftp.upload(new File("local file path...");
ftp.disconnect();

Thanks in advance.

提前致谢。

回答by Miljen Mikic

We've been using Apache Commons Netlibrary, and I can recommend it. Example of usage: (I've dropped try-catch block and check whether FtpClient is connected)

我们一直在使用Apache Commons Net库，我可以推荐它。使用示例：（我删除了 try-catch 块并检查 FtpClient 是否已连接）

import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;
..
private FTPClient ftpClient; //needs to be initialized
..
ftpClient.setConnectTimeout(timeout);
ftpClient.setDataTimeout(timeout);
ftpClient.setDefaultTimeout(timeout);
ftpClient.connect(hostname, port);
ftpClient.setSoTimeout(timeout);
ftpClient.login(username, password);
ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE); // or FtpClient.ASCII_FILE_TYPE, up to you
ftpClient.changeWorkingDirectory(destFolder);
srcFile = new File("local file path.."); // replace with actual path
FileInputStream fis = new FileInputStream(srcFile);
ftpClient.storeFile(filename, fis);

回答by NPKR

By using commons-net-3.0.jar provided by Apache you can communicate with Server with FTP.

通过使用 Apache 提供的 commons-net-3.0.jar，您可以通过 FTP 与 Server 进行通信。

FTPUtils Class is having core methods like connect,disconnect,upload and download methods. and FTPMain having main method to upload file.

FTPUtils 类具有核心方法，如连接、断开连接、上传和下载方法。和 FTPMain 有上传文件的主要方法。

FTPUtils:

FTP 实用程序：

package com.ftpclient.test;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;

public class FTPUtils {
    public static void ftpConnect(FTPClient ftpclient, String host, String username, String password) throws IOException {
        System.out.println("FTPUtils :: Logging in FTP..");
        try{
            ftpclient.connect(host);
            if (!ftpclient.login(username, password)) {
                throw new IOException("Supplied wrong credentials to FTP Server");
            }

            if (ftpclient.getReplyCode() != 0) {
                System.out.println(ftpclient.getReplyString());
            }
        }catch(IOException ioe){
            ioe.printStackTrace();
            System.out.println("FTP Client is not able to Connect to host");
            throw new IOException("FTP Client is not able to Connect to host");
        }
        System.out.println("FTPUtils :: FTP Login Successful..");
    }

    /**
     * disconnect to FTP server
     * 
     * @param ftpclient is Object which is having details of FTP server like IP, user name and password
     * @throws IOException throws Exception
     */
    public static void ftpDisConnect(FTPClient ftpclient) throws IOException {
        System.out.println("FTPUtils :: FTP Logging out..");
        ftpclient.logout();
        ftpclient.disconnect();
        System.out.println("FTPUtils :: FTP Disconnected Successfully..");
    }

    /**
     * download's file from source path to destination path by using FTP Client.
     * 
     * @param ftpclient is Object which is having details of FTP server like IP, user name and password
     * @param sourcePath is String from where to download's file
     * @param destinationPath is String to where to download's file.
     * @return boolean true if download's with out any fail else false
     * @throws IOException will throw any problem with file system
     */
    public static boolean downloadFile(FTPClient ftpclient, String sourcePath, String destinationPath) throws IOException {
        System.out.println("FTPUtils :: RemoteFile download starts ..FTP SOURCE " + sourcePath + " DESTINATION " + destinationPath);
        FileOutputStream fos = null;
        boolean result = false;
        try{            
            ftpclient.setFileTransferMode(FTP.BINARY_FILE_TYPE);
            ftpclient.setFileType(FTP.BINARY_FILE_TYPE);
            File fDestination = new File(destinationPath);
            fos = new FileOutputStream(fDestination);
            result = ftpclient.retrieveFile(sourcePath, fos);
            if (result) {
                System.out.println("FTPUtils :: RemoteFile download Completed..FTP " + sourcePath);
            }
        }catch(IOException ioe){
            ioe.printStackTrace();
            System.out.println("FTP is not able to Download the files from host");
            throw new IOException("FTP is not able to Download the files from host");
        }finally{
            fos.close();
        }
        return result;
    }

    /**
     * @param ftpclient
     * @param sourcePath
     * @param destinationPath
     * @throws IOException
     */
    public static void uploadFile(FTPClient ftpclient, String sourcePath, String destinationPath) throws IOException {
        FileInputStream fis = null;
        try {
            //
            // Create an InputStream of the file to be uploaded
            //
            fis = new FileInputStream(sourcePath);

            //
            // Store file to server
            //
            ftpclient.storeFile(destinationPath, fis);
        }catch(IOException ioe){
            ioe.printStackTrace();
            System.out.println("FTP is not able to upload the files from host");
            throw new IOException("FTP is not able to upload the files from host");
        }finally{
            fis.close();
        }
    }
}

FTPMain:

FTP主站：

import java.io.IOException;
import org.apache.commons.net.ftp.FTPClient;

public class FTPMain {
    public static void main(String[] str){
        FTPClient ftpclient = new FTPClient();
        try {
            FTPUtils.ftpConnect(ftpclient, "ipaddress", "username", "password");
            FTPUtils.uploadFile(ftpclient, "sourcePath", "destinationPath");
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}