import org.apache.commons.net.util.TrustManagerUtils; //导入依赖的package包/类
private SSLSocketFactory getSocketFactoryFromPEM(String filePath) throws Exception {
    Security.addProvider(new BouncyCastleProvider());

    PEMParser pemParser = new PEMParser(new FileReader(getConfigFilename(filePath)));
    pemParser.readObject();
    PemObject pemObject = pemParser.readPemObject();
    pemParser.close();

    X509CertificateHolder holder = new X509CertificateHolder(pemObject.getContent());
    X509Certificate bc = new JcaX509CertificateConverter().setProvider("BC")
            .getCertificate(holder);

    KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
    keyStore.load(null, null);
    keyStore.setCertificateEntry("ca", bc);

    TrustManager trustManager = TrustManagerUtils.getDefaultTrustManager(keyStore);
    SSLContext sslContext = SSLContextUtils.createSSLContext("TLS", null, trustManager);

    return sslContext.getSocketFactory();
}
 

import org.apache.commons.net.util.TrustManagerUtils; //导入依赖的package包/类
/**
 * Connect to a FTP server
 */
public void connect()
throws IOException, SecurityException
{
	if(this.isSecured())
	{
		ftpClient = new FTPSClient(false);
		((FTPSClient)ftpClient).setTrustManager(TrustManagerUtils.getAcceptAllTrustManager());
	}
	else
		ftpClient = new FTPClient();
	
	// suppress login details

       ftpClient.addProtocolCommandListener(new PrintCommandListener(new PrintWriter(
       		new OutputStreamWriter(System.out,IO.CHARSET)), true));
       
	int keepAliveTimeout = this.getKeepAliveTimeout();
	if (keepAliveTimeout > 0) {

           ftpClient.setControlKeepAliveTimeout(keepAliveTimeout);

       }

	int controlKeepAliveReplyTimeout = this.getControlKeepAliveReplyTimeout();
       if (controlKeepAliveReplyTimeout > 0) 
           ftpClient.setControlKeepAliveReplyTimeout(controlKeepAliveReplyTimeout);
       
       
       int port = this.getPort();
       if(port > 0)
       	ftpClient.connect(getHost(), getPort());
       else
       	ftpClient.connect(getHost());

	int reply = ftpClient.getReplyCode();

       if (!FTPReply.isPositiveCompletion(reply))
       {
       	disconnect();
       	return;
       }
       
       if (!ftpClient.login(this.getUsername(), new String(getPassword())))
          throw new SecurityException("login failed");
       
       if (isBinaryTransfer())
       {
       	ftpClient.setFileType(FTP.BINARY_FILE_TYPE); 
       }
       else
       {
       	ftpClient.setFileType(FTP.NON_PRINT_TEXT_FORMAT);
       	ftpClient.setAutodetectUTF8(true);
       }
       
       if (isLocalActive()) 
           ftpClient.enterLocalActiveMode();
       else
          	ftpClient.enterLocalPassiveMode();

       ftpClient.setUseEPSVwithIPv4(isUseEpsvWithIPv4());
       
       ftpClient.setCharset(this.getCharset());
       
       this.connected = true;
       
}