問題描述

我正在嘗試開發一個簡單的 java 代碼，它將一些內容從本地機器上傳到服務器/另一臺機器.我使用了下面的代碼

Im trying to develop a simple java code which will upload some contents from local machine to a server/another machine.I used the below code

import sun.net.ftp.*;
import java.io.*;

public class SftpUpload {
 public static void main(String args[]) {
   String hostname = "some.remote.machine"; //Remote FTP server: Change this
   String username = "user"; //Remote user name: Change this
   String password = "start123"; //Remote user password: Change this
   String upfile = args[0]; //File to upload passed on command line
   String remdir = "/home/user"; //Remote directory for file upload
   FtpClient ftp = new FtpClient();
   try {
      ftp.openServer(hostname); //Connect to FTP server
      ftp.login(username, password); //Login
      ftp.binary(); //Set to binary mode transfer
      ftp.cd(remdir); //Change to remote directory
      File file = new File(upfile);
      OutputStream out = ftp.put(file.getName()); //Start upload
      InputStream in = new FileInputStream(file);
      byte c[] = new byte[4096];
      int read = 0;
      while ((read = in.read(c)) != -1 ) {
         out.write(c, 0, read);
      } //Upload finished
      in.close();
      out.close();
      ftp.closeServer(); //Close connection
   } catch (Exception e) {
      System.out.println("Error: " + e.getMessage());
   }
 }
}

但它在第 11 行顯示錯誤為無法實例化 FtpClient 類型".誰能幫我解決一下.

But it is showing error in Line 11 as 'Cannot instantiate the type FtpClient'. Can some one help me how to rectify it.

推薦答案

你不能實例化它，因為 sun.net.ftp.FtpClient 是抽象類.

You cannot instantiate it because sun.net.ftp.FtpClient is abstract class.

我建議使用 Apache Commons Net 而不是使用 sun.x 包.FTP客戶端示例可以從這里找到.

I suggest using Apache Commons Net instead of playing with sun.x packages. FTP client example can be found from here.

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