public static FTPSClient getFtpsClient(FtpConfigDto config) {
        try {
            FTPSClient ftpsClient = null;
            //建立SSL上下文
            SSLContext sslContext = SSLContext.getInstance("TLS");
            //自定義證書，忽略已過期證書
            TrustManager[] trustAllCerts = new TrustManager[1];
            TrustManager tm = new miTM();
            trustAllCerts[0] = tm;
            //初始化
            sslContext.init(null, trustAllCerts, null);

            //建立客戶端，加密選擇Implicit
            ftpsClient = new FTPSClient(true, sslContext);

            ftpsClient.setAuthValue("TLS");
            FTPClientConfig ftpClientConfig = new FTPClientConfig(FTPClientConfig.SYST_UNIX);
            ftpClientConfig.setServerLanguageCode("de");
            ftpsClient.configure(ftpClientConfig);
            ftpsClient.setConnectTimeout(10*1000);
            ftpsClient.setDataTimeout(18000);
            ftpsClient.addProtocolCommandListener(new PrintCommandListener(new PrintWriter(System.out)));
            ftpsClient.connect(config.getHost(), config.getPort());
            ftpsClient.execPROT("P");
            //被動模式
            ftpsClient.enterLocalPassiveMode();

            ftpsClient.login(config.getUsername(), config.getPassword());

            if (!FTPReply.isPositiveCompletion(ftpsClient.getReplyCode())) {
                log.warn("FTP伺服器拒絕連線");
                //說明連線失敗，需要斷開連線
                ftpsClient.disconnect();
            } else {
                log.info("FTP連線成功。");
            }
            ftpsClient.execPBSZ(0);

            ftpsClient.setRemoteVerificationEnabled(false);
            ftpsClient.setFileType(FTPClient.BINARY_FILE_TYPE);
            ftpsClient.setKeepAlive(true);
            //被動模式
            ftpsClient.enterLocalPassiveMode();
　　　　　　　　
　　　　　　

            log.info("連線FTP伺服器成功返回碼 ==> {}；ftpProperties：{}", ftpsClient.getReplyCode(), JSONObject.toJSONString(config));
            return ftpsClient;
        } catch (Exception e){
            log.error("ftp連線異常:",e);
        }
        return null;
    }

static class miTM implements TrustManager, X509TrustManager {
    @Override
    public X509Certificate[] getAcceptedIssuers() {
        return null;
    }

    public boolean isServerTrusted(X509Certificate[] certs) {
        return true;
    }

    public boolean isClientTrusted(X509Certificate[] certs) {
        return true;
    }

    @Override
    public void checkServerTrusted(X509Certificate[] certs, String authType)
            throws CertificateException {
        return;
    }

    @Override
    public void checkClientTrusted(X509Certificate[] certs, String authType)
            throws CertificateException {
        return;
    }
}