package com.utils;import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;import org.apache.commons.lang3.StringUtils;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPClientConfig;
import org.apache.commons.net.ftp.FTPFile;
import org.apache.commons.net.ftp.FTPReply;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;/*** ftp 工具类* * @date 2016年1月15日*/
public class FTPUtils {private static final Logger logger = LoggerFactory.getLogger(FTPUtils.class);private static final FTPClientConfig config = new FTPClientConfig(FTPClientConfig.SYST_NT);
public static final String DATE_TIME_FORMAT_TWO = "yyyy-MM-dd HH:mm";private static final int BUFFER_SIZE = 1024;static {config.setDefaultDateFormatStr(DATE_TIME_FORMAT_TWO);config.setServerTimeZoneId("GMT+8");config.setServerLanguageCode("zh");}/*** 获取ftp 客户端** @param host* @param port* @param username* @param password* * @return FTPClient*/public static FTPClient client(String host, int port, String username, String password) {FTPClient client = new FTPClient();client.configure(config);try {client.connect(host, port);client.enterLocalPassiveMode();int replyCode = client.getReplyCode();if (FTPReply.isPositiveCompletion(replyCode)) {client.login(username, password);replyCode = client.getReplyCode();if (FTPReply.isPositiveCompletion(replyCode)) {return client;} else {logger.info(String.format("ftp client open faild. replyCode: %d, %s ", replyCode, client.getReplyString()));client.disconnect();return null;}} else {logger.info(String.format("ftp client open faild. replyCode: %d, %s ", replyCode, client.getReplyString()));client.disconnect();return null;}} catch (IOException e) {logger.error("ftp client open faild", e);return null;}}/*** ftp 下载远程文件* * @param client ftp客户端对象* @param remoteDirPath 远程目录* @param remoteFile 远程文件* @param localDir 本地存储目录（空 使用用户当前目录）* @param localFile 本地存储名称（空 使用文件原始名称）* * @return boolean*/public static boolean download(FTPClient client, String remoteDirPath, String remoteFile, String localDir, String localFile) {try {boolean dir = client.changeWorkingDirectory(remoteDirPath);boolean result = false;if (dir) {FTPFile[] files = client.listFiles(remoteFile);if (files.length == 1) {FTPFile file = files[0];if (file.isFile()) {if (StringUtils.isEmpty(localFile))localFile = file.getName();if (StringUtils.isEmpty(localDir))localDir = System.getProperty("user.home");File localDirFile = new File(localDir);if (!localDirFile.exists())localDirFile.mkdirs();StringBuilder sb = new StringBuilder(localDir);sb.append(File.separator).append(localFile);try (FileOutputStream out = new FileOutputStream(sb.toString())) {client.setBufferSize(BUFFER_SIZE);client.setFileType(FTPClient.BINARY_FILE_TYPE);result = client.retrieveFile(file.getName(), out);} catch (IOException e) {e.printStackTrace();logger.error("ftp download faild", e);}}}}return result;} catch (IOException e) {e.printStackTrace();logger.error("ftp download faild", e);return false;}}/*** ftp 连接断开** @param client ftp 客户端*/public static void close(FTPClient client) {try {if (!client.isConnected())client.disconnect();} catch (IOException e) {e.printStackTrace();}}}

FTPClient client = FTPUtils.client(ftpHost, ftpPort, ftpUsername, ftpPassword);
FTPUtils.download(client, "/", file + zip, localPath, null);
FTPUtils.close(client);