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