Ftp访问工具类

java开发中经常会用到ftp上传、下载指定ftp服务器的文件，这里整理一个通过apache的commons-net包访问ftp服务的工具类：

package utils;import java.io.IOException;import java.net.SocketException;import org.apache.commons.net.ftp.FTPClient;import org.apache.commons.net.ftp.FTPReply;import org.apache.log4j.Logger;/** * @description * @author minux */public class FtpUtil {public static final Logger logger = Logger.getLogger(FtpUtil.class);private String hostIp;private int port;private String dir;private String userName;private String password;private static final String DIR_SEPARATOR = "/";private FTPClient ftpClient;public FtpUtil() {}public FtpUtil(String hostIp, int port, String dir, String userName,String password) {this.hostIp = hostIp;this.port = port;this.dir = dir;this.userName = userName;this.password = password;}/** * 连接FTP-------尝试3次 *  * @return */public boolean getFtpConnection() {int count = 0;boolean isConnected = false;while (count < 3 && !(isConnected = connectFtp())) {count++;logger.info("After a second connection again.");try {Thread.sleep(1000);} catch (InterruptedException e) {e.printStackTrace();}}return isConnected;}private boolean connectFtp() {try {ftpClient = new FTPClient();ftpClient.setDataTimeout(30000);ftpClient.setConnectTimeout(10000);ftpClient.connect(hostIp, port);if (!FTPReply.isPositiveCompletion(ftpClient.getReplyCode())) {logger.warn("connect to server [" + hostIp + "] fail. ");ftpClient.disconnect();return false;} else {logger.info("connect to server [" + hostIp + "] success.");return true;}} catch (SocketException e) {logger.error("ftpHost [" + hostIp+ "] is error, please give the correct ip: ", e);return false;} catch (IOException e) {logger.error("ftpPort [" + hostIp+ "] is error, please give the correct port: ", e);return false;}}/** * 关闭FTP链接 */public void closeFtpConnection() {if (ftpClient.isConnected()) {try {ftpClient.disconnect();} catch (IOException e) {logger.error("close FTPClient error,", e);}}}}

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用到的第三方jar：

commons-net-3.3.jar

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目前该jar的新版本，老版本(1.4.1)会出现乱码的问题，并且不能设置一些常规参数，比如connectionTimeout(连接超时)

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