Java 如何正确连接和断开与FTP服务器的连接？

我想知道我连接和断开FTP服务器的方式是否正确，或者是否可以更好。

我正在使用

sun.net.ftp.FtpClient

import sun.net.ftp.FtpClient;

public class FTPUtility
{
    public static FtpClient connect(FTPConfig ftpConfig,WebTextArea statusTextArea)
    {
        String hostname = ftpConfig.getFtpServer();
        String username = ftpConfig.getUsername();
        String password = ftpConfig.getPassword();
        String portnumb = ftpConfig.getPort();

            try
            {
                FtpClient client = new FtpClient(hostname);
                statusTextArea.append("Connecting to " + hostname + " as " + username + " on port:" + portnumb );
                client.login(username, password);
                client.binary();
                statusTextArea.append("Connected to " + hostname + " as " + username  + " on port:" + portnumb );
                return client;
            }
            catch (Exception e)
            {
                statusTextArea.append("Failed to connect to " + hostname + " as " + username + "\n".concat(e.getMessage()) );
                return null;
            }

    }

public static boolean disConnect(FtpClient client, WebTextArea statusTextArea)
{     
    boolean success = false;
    if (client != null)
    {
        try
        {
            statusTextArea.append("Disconnecting from server...");
            client.closeServer();
            statusTextArea.append("Disconnected from server." );
            success = true;
        }
        catch (Exception e)
        {
            statusTextArea.append("Failed to disconnect from server. " + "\n".concat(e.getMessage()));
        }
    }

  return success;
}
}

如果我们看一下，它显示使用

logout（）

和

disconnect（）

我还建议为方法名disConnect建立一个更好的命名约定，它应该是disConnect（FtpClient客户端，WebTextArea statusTextArea）（无大写字母C）

如果关闭失败，也返回false

catch (Exception e)
    {
        statusTextArea.append("Failed to disconnect from server. " + "\n".concat(e.getMessage()));
return false;
    }
}

---

您可能希望从apache commons项目中签出FtpClient： . javaDoc包含一些精心设计的示例

catch (Exception e)
    {
        statusTextArea.append("Failed to disconnect from server. " + "\n".concat(e.getMessage()));
return false;
    }
}