Java FTP 下载文件和文件夹
用apache下的common-net.jar包开发Java FTP下载功能
导入apache-net-2.0.jar到工程中以及其他jar
import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.net.SocketException; import org.apache.commons.net.ftp.FTP; import org.apache.commons.net.ftp.FTPClient; import org.apache.commons.net.ftp.FTPReply; import org.apache.log4j.Logger; /** * 采用的是apache commons-net架包中的ftp工具类实现的 * * @author chiyong * */ public class FtpCollectionUtil { private String username; private String password; private String ftpHostName; private int port = 21; private FTPClient ftpClient = new FTPClient(); private FileOutputStream fos = null; private Logger logger = Logger.getLogger(FtpCollectionUtil.class); public FtpCollectionUtil(String username, String password, String ftpHostName, int port) { super(); this.username = username; this.password = password; this.ftpHostName = ftpHostName; this.port = port; } /** * 建立连接b */ private void connect() { try { logger.debug("开始连接"); // 连接 ftpClient.connect(ftpHostName, port); int reply = ftpClient.getReplyCode(); if (!FTPReply.isPositiveCompletion(reply)) { ftpClient.disconnect(); } // 登录 ftpClient.login(username, password); ftpClient.setBufferSize(256); ftpClient.setFileType(FTP.BINARY_FILE_TYPE); ftpClient.setControlEncoding("utf8"); logger.debug("登录成功!"); logger.debug("开始登录!"); } catch (SocketException e) { logger.error("", e); } catch (IOException e) { logger.error("", e); } } /** * 关闭输入输出流 * * @param fos */ private void close(FileOutputStream fos) { try { if (fos != null) { fos.close(); } ftpClient.logout(); logger.info("退出登录"); ftpClient.disconnect(); logger.info("关闭连接"); } catch (IOException e) { logger.error("", e); } } /** * 下载文件 * * @param ftpFileName * @param localDir */ public void down(String ftpFileName, String localDir) { connect(); downFileOrDir(ftpFileName, localDir); close(fos); } private void downFileOrDir(String ftpFileName, String localDir) { try { File file = new File(ftpFileName); File temp = new File(localDir); if (!temp.exists()) { temp.mkdirs(); } // 判断是否是目录 if (isDir(ftpFileName)) { String[] names = ftpClient.listNames(); for (int i = 0; i < names.length; i++) { System.out.println(names[i] + "^^^^^^^^^^^^^^"); if (isDir(names[i])) { downFileOrDir(ftpFileName + '/' + names[i], localDir + File.separator + names[i]); ftpClient.changeToParentDirectory(); } else { File localfile = new File(localDir + File.separator + names[i]); if (!localfile.exists()) { fos = new FileOutputStream(localfile); ftpClient.retrieveFile(names[i], fos); } else { logger.debug("开始删除文件"); file.delete(); logger.debug("文件已经删除"); fos = new FileOutputStream(localfile); ftpClient.retrieveFile(ftpFileName, fos); } } } } else { File localfile = new File(localDir + File.separator + file.getName()); if (!localfile.exists()) { fos = new FileOutputStream(localfile); ftpClient.retrieveFile(ftpFileName, fos); } else { logger.debug("开始删除文件"); file.delete(); logger.debug("文件已经删除"); fos = new FileOutputStream(localfile); ftpClient.retrieveFile(ftpFileName, fos); } ftpClient.changeToParentDirectory(); } logger.info("下载成功!"); } catch (SocketException e) { logger.error("连接失败!", e); } catch (IOException e) { logger.error("下载失败!", e); } } // 判断是否是目录 public boolean isDir(String fileName) { try { // 切换目录,若当前是目录则返回true,否则返回true。 boolean falg = ftpClient.changeWorkingDirectory(fileName); return falg; } catch (Exception e) { e.printStackTrace(); logger.error("", e); } return false; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public String getFtpHostName() { return ftpHostName; } public void setFtpHostName(String ftpHostName) { this.ftpHostName = ftpHostName; } public int getPort() { return port; } public void setPort(int port) { this.port = port; } public class TestFileUtil { public static void main(String[] args) { /** * apache common-net实现的 */ FtpCollectionUtil ftpUtil = new FtpCollectionUtil("webfocus1", "webfocus1", "192.168.0.2", 21); // /home/webfocus1/apache-tomcat-6.0.37/webapps/NEZA_ROOT/要下载的文件夹。 ftpUtil.down( "/home/webfocus1/apache-tomcat-6.0.37/webapps/NEZA_ROOT/", "D://a"); } } }
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