FTP操作工具类：

public class FTPUtil {
	private final Logger logger = LoggerFactory.getLogger(FTPUtil.class);
	private static String encoding = "UTF-8";
	/**
	 * ftp客户端
	 */
	FTPClient ftpClient;
	/**
	 * ftp服务器地址
	 */
	private String host;
	/**
	 * ftp 端口号 默认21
	 */
	private int port = 21;
	/**
	 * ftp服务器用户名
	 */
	private String username;
	/**
	 * ftp服务器密码
	 */
	private String password;
	/**
	 * ftp远程目录
	 */
	private String remoteDir;
	/**
	 * 本地存储目录
	 */
	private String localDir;
	/**
	 * 文件路径通配符 默认列出所有
	 */
	private String regEx = "*";
	/**
	 * 指定要下载的文件名
	 */
	private String downloadFileName;
	public FTPUtil setConfig(String host, String username, String password) {
		this.host = host;
		this.username = username;
		this.password = password;
		return this;
	}
	public FTPUtil setConfig(String host, int port, String username, String password) {
		this.host = host;
		this.port = port;
		this.username = username;
		this.password = password;
		return this;
	}
	private void connectServer() throws Exception {
		if (this.ftpClient == null) {
			this.ftpClient = new FTPClient();
		}
		// 设置超时时间
		this.ftpClient.setConnectTimeout(30000);
		try {
			// 1、连接服务器
			if (!this.ftpClient.isConnected()) {
				// 如果采用默认端口，可以使用client.connect(host)的方式直接连接FTP服务器
				this.ftpClient.connect(this.host, this.port);
				// 登录
				this.ftpClient.login(this.username, this.password);
				// 获取ftp登录应答码
				int reply = this.ftpClient.getReplyCode();
				// 验证是否登陆成功
				if (!FTPReply.isPositiveCompletion(reply)) {
					logger.info("未连接到FTP，用户名或密码错误。");
					this.ftpClient.disconnect();
					throw new RuntimeException("未连接到FTP，用户名或密码错误。");
				} else {
					logger.info("FTP连接成功。IP:"   host   "PORT:"   port);
				}
				// 2、设置连接属性
				this.ftpClient.setControlEncoding(FTPUtil.encoding);
				// 设置以二进制方式传输
				this.ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
				this.ftpClient.enterLocalPassiveMode();
			}
		} catch (Exception e) {
			try {
				this.ftpClient.disconnect();
			} catch (IOException e1) {
			}
			logger.error("连接FTP服务器出现异常，参数：ip="   this.host   "，port="   this.port   "，user="   this.username
					  "，password="   this.password);
		}
	}
	public List