该代码使用Apache Commons vsf2通过安全ftp连接(SFTP)上传文件

try {
  String filepath = "<FILE PATH>";
  String serverAddress = "<FTP SERVER ADDRESS>";
  String userId = "<FTP USER ID>";
  String password = "<FTP PASSWORD>";
  String remoteDirectory = "<FTP DIRECTORY TO UPLOAD TO>";   
  String keyPath = "<PATH TO YOUR KEY>";   
  String passPhrase = "<PASSWORD FOR YOUR KEY>";   
 
 
  File file = new File(filepath);
  if (!file.exists())
    throw new RuntimeException("Error. File not found");
 
  //Initializes the file manager
  StandardFileSystemManager manager = new StandardFileSystemManager();
  manager.init();
 
  //Setup our SFTP configuration
  FileSystemOptions opts = new FileSystemOptions();
  SftpFileSystemConfigBuilder.getInstance().setStrictHostKeyChecking(opts,"no");
  SftpFileSystemConfigBuilder.getInstance().setUserDirIsRoot(opts,true);
  SftpFileSystemConfigBuilder.getInstance().setTimeout(opts,10000);
 
  // Create local file object
  FileObject localFile = manager.resolveFile(file.getAbsolutePath());
 
  // Create remote file object
  FileObject remoteFile = manager.resolveFile(createConnectionString(serverAddress,userId,password,keyPath,passPhrase,fileToFTP),createDefaultOptions(keyPath,passPhrase));
 
 
  // Copy local file to sftp server
  remoteFile.copyFrom(localFile,Selectors.SELECT_SELF);
  System.out.println("File upload successful");
 
}
catch (Exception ex) {
  ex.printStackTrace();
  return false;
}
finally {
  manager.close();
}

您可以在Apache Commons VFS Documentation查看更多信息

编辑

在理解了FTPS背后的逻辑和@ riyaz-ali的帖子并将您的评论中的链接引用到this article之后

Apache FTP客户端存在问题,它不支持TLS会话恢复.您可以修补Apache Commons Library的现有实现.

您可以尝试以下代码步骤来使其工作：

>在项目中添加以下修补的类. (此类扩展了Apache commons中给出的补丁中现有的FTPS实现)

import java.io.IOException;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.net.Socket;
import java.util.Locale;
 
import javax.net.ssl.SSLSession;
import javax.net.ssl.SSLSessionContext;
import javax.net.ssl.SSLSocket;
 
import org.apache.commons.net.ftp.FTPSClient;
 
import com.google.common.base.Throwables;
 
public class PatchedFTPSClient extends FTPSClient {
 
        @Override
        protected void _prepareDataSocket_(final Socket socket) throws IOException {
                if(socket instanceof SSLSocket) {
                        final SSLSession session = ((SSLSocket) _socket_).getSession();
                        final SSLSessionContext context = session.getSessionContext();
                        try {
                                final Field sessionHostPortCache = context.getClass().getDeclaredField("sessionHostPortCache");
                                sessionHostPortCache.setAccessible(true);
                                final Object cache = sessionHostPortCache.get(context);
                                final Method method = cache.getClass().getDeclaredMethod("put",Object.class,Object.class);
                                method.setAccessible(true);
                                final String key = String.format("%s:%s",socket.getInetAddress().getHostName(),String.valueOf(socket.getPort())).toLowerCase(Locale.ROOT);
                                method.invoke(cache,key,session);
                        } catch(Exception e) {
                                throw Throwables.propagate(e);
                        }
                }
        }
 
}

>使用此修改后的代码段.

TransferImagenesFTP.ftpClient = new PatchedFTPSClient();
 
TransferImagenesFTP.ftpClient.connect(InetAddress.getByName<SERVER-ADDRESS>"),26);
TransferImagenesFTP.ftpClient.login("<USERNAME>","<PASSWORD>");
TransferImagenesFTP.ftpClient.execPBSZ(0);
TransferImagenesFTP.ftpClient.execPROT("P");
TransferImagenesFTP.ftpClient.enterLocalPassiveMode();
 
//Now use the FTP client to upload the file as usual.

希望这对您有用,并将解决您的问题.