java.lang.NoClassDefFoundError：org / apache / commons / net / ftp / FTPClient-在Eclipse中

Question

[下面是我将HTML文件写到FTP到服务器的一段代码。尽管代码中没有错误，但是在执行程序时，FTPClient上出现了No Class Def Found Error。我已经下载了commons-net-3.6-bin并将以下jar文件导入到我的项目库中commons-net-3.6.jarcommons-net-3.6-source.jarcommons-net-examples-3.6.jar

不确定从这里要去哪里。

String projectPath = System.getProperty("user.dir");        
        String ImportSKU = projectPath + "Import SKU.HTML";
        File file = new File(ImportSKU);


          FTPClient client = new FTPClient();
          String filename = ImportSKU;


          // Read the file from resources folder.
          ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
          try (InputStream is = classLoader.getResourceAsStream(filename)) {

              client.connect("ftp://www.data.com");
              client.login("usedid", "password");

              // Store file to server
              client.storeFile(filename, is);
              client.logout();
          } catch (IOException e) {
              e.printStackTrace();
          } finally {
              try {
                  client.disconnect();
              } catch (IOException e) {
                  e.printStackTrace();
              }
          }

Answer 1

我有同样的问题

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

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

public class main {

  public static void main(String[] args) {
    String server = "serverip";
    int port = 21;
    String user = "user";
    String pass = "pass";

   FTPClient ftpClient = new FTPClient();
    try {

        ftpClient.connect(server, port);
        ftpClient.login(user, pass);
        ftpClient.enterLocalPassiveMode();
        ftpClient.setFileType(FTP.BINARY_FILE_TYPE);

        String remoteFile1 = "filename.csv";
        File downloadFile1 = new File("C:/filename.csv");
        OutputStream outputStream1 = new BufferedOutputStream(new 
        FileOutputStream(downloadFile1));
        boolean success = ftpClient.retrieveFile(remoteFile1, outputStream1);
        outputStream1.close();

        if (success) {
            System.out.println("File #1 has been downloaded successfully.");
        }

    } catch (IOException ex) {
        System.out.println("Error: " + ex.getMessage());
        ex.printStackTrace();
    } finally {
        try {
            if (ftpClient.isConnected()) {
                ftpClient.logout();
                ftpClient.disconnect();
            }
        } catch (IOException ex) {
            System.out.println("ex end");
            ex.printStackTrace();
        }
    }
 }

我也在FTPClient上也收到“找不到类定义错误”。您是否找到了解决方案？