Question

我正在使用commans.net api来执行上传和执行等任务从ftp服务器下载文件。我可以执行这些任务已成功但下载的文件已损坏。我无法打开那些文件以通常的方式。请帮帮我..

我的简单代码看起来像

    public class FTPConnect {

public static void main(String[] args) {
    startServer();

    connectClient();

}

private static void startServer() {

    FtpServerFactory serverFactory = new FtpServerFactory();

    ListenerFactory factory = new ListenerFactory();
    factory.setPort(21);// set the port of the listener (choose your desired
                        // port, not 1234)
    System.out.println("port has been set to 21");
    serverFactory.addListener("default", factory.createListener());
    PropertiesUserManagerFactory userManagerFactory = new PropertiesUserManagerFactory();
    userManagerFactory.setFile(new File("lib/users.properties"));

    System.out.println("users.properties has been set..");
    userManagerFactory.setPasswordEncryptor(new PasswordEncryptor() {

                @Override
                public String encrypt(String password) {
                    return password;
                }

                @Override
                public boolean matches(String passwordToCheck,
                        String storedPassword) {
                    return passwordToCheck.equals(storedPassword);
                }
            });
    System.out.println("password has been encrypted...");
    BaseUser user = new BaseUser();
    user.setName("java");
    user.setPassword("shiva.dave");
    System.out.println("password has been set..to java and shiva.dave");
    user.setHomeDirectory("lib");
    System.out.println("home directory has been set...");
    List<Authority> authorities = new ArrayList<Authority>();
    authorities.add(new WritePermission());
    user.setAuthorities(authorities);
    UserManager um = userManagerFactory.createUserManager();
    try {
        um.save(user);// Save the user to the user list on the filesystem
        System.out.println("user has been set to the filesystem..");
    } catch (FtpException e1) {
        e1.printStackTrace();
    }
    serverFactory.setUserManager(um);
    FtpServer server = serverFactory.createServer();
    try
    {
        server.start();//Your FTP server starts listening for incoming FTP-connections, using the configuration options previously set
        System.out.println("Server has been started.....");
    }
    catch (FtpException ex)
    {
      ex.printStackTrace();
    }

}

private static void connectClient() {

    FTPClient client = new FTPClient();
    try{
        client.connect(InetAddress.getLocalHost(), 21);
        String loging_success = client.login("java", "shiva.dave") == true ? "success" : "failed";
        System.out.println("login: " + loging_success);
        FTPFile[] clients = client.listFiles("/");
        System.out.println("Listed " + clients.length + " files.");
        for (FTPFile file : clients) {
            System.out.println(file.getName());
        }

        for (FTPFile ftpFile : clients) {
            String remoteFile2 = ftpFile.getName();
            File downloadFile2 = new File("D:/test2/"+ftpFile.getName());
            OutputStream outputStream2 = new BufferedOutputStream(new FileOutputStream(downloadFile2));
            InputStream inputStream = client.retrieveFileStream(remoteFile2);
            byte[] bytesArray = new byte[4096];
            int bytesRead = -1;
            while ((bytesRead = inputStream.read(bytesArray)) != -1) {
                outputStream2.write(bytesArray, 0, bytesRead);
            }

            boolean success = client.completePendingCommand();
            if (success) {
                System.out.println("File #2 has been downloaded successfully.");
            }
            outputStream2.close();
            inputStream.close();
        }

    }
    catch(Exception e){
        e.printStackTrace();
    }
    finally{
        try{
            client.logout();
            client.disconnect();
        }
        catch(Exception e){
            e.printStackTrace();
        }
    }

}
}

Answer 1

我找到了一个解决方案，想把它放在这里.. 首先，当您尝试从ftp服务器下载文件时，您必须指定文件类型和传输模式才能成功下载文件。

这是您需要插入的代码。

client.setFileType（FTP.BINARY_FILE_TYPE，FTP.BINARY_FILE_TYPE）; client.setFileTransferMode（FTP.BINARY_FILE_TYPE）;

＆＃34;观看它们＃34;

您必须在成功登录后插入这两行代码，否则您将无法成功下载文件...

希望这个答案可以帮助您下载文件而不会被破坏..

JAVA Commons-Net FTPClient，下载文件已损坏

1 个答案: