从远程ftp上按修改时间或文件名称更新相关文件（原创）

package com.bj.ftp;/** *需要ftp4j.jar *author http://faithlee.iteye.com */import it.sauronsoftware.ftp4j.FTPAbortedException;import it.sauronsoftware.ftp4j.FTPClient;import it.sauronsoftware.ftp4j.FTPDataTransferException;import it.sauronsoftware.ftp4j.FTPException;import it.sauronsoftware.ftp4j.FTPFile;import it.sauronsoftware.ftp4j.FTPIllegalReplyException;import it.sauronsoftware.ftp4j.FTPListParseException;import java.io.File;import java.io.IOException;http://faithlee.iteye.comimport java.util.Date;import java.util.HashMap;import java.util.Iterator;import java.util.Map;import com.bj.util.CommonStringDateUtil;import com.bj.util.PropertiesUtil;public class FtpTool {private FTPClient client = new FTPClient();/** * 连接且登录到特定的FTP服务器文件夹 *  * @return * @throws FTPException * @throws FTPIllegalReplyException * @throws IOException * @throws IllegalStateException */public boolean connectToServer(PropertiesUtil pro,String filename) throws IllegalStateException, IOException,FTPIllegalReplyException, FTPException {String server = pro.getValue(filename, "ftp.ip");String user = pro.getValue(filename, "ftp.user");String password = pro.getValue(filename, "ftp.password");String path = pro.getValue(filename, "ftp.path");client.connect(server);client.login(user, password);System.out.println("登陆成功");client.changeDirectory(path);if (client.isCompressionSupported()) {client.setCompressionEnabled(true);}return true;}/**http://faithlee.iteye.com * // 根据修改时间更新相同文件名的文件  * public boolean doUpdate() throws * IllegalStateException, IOException, FTPIllegalReplyException, * FTPException, FTPDataTransferException, FTPAbortedException, * FTPListParseException { Boolean bl = null;  * Map<String,FileObject> remotefiles = getRemotefiles();  * Map<String,FileObject> localfiles = getLocalfiles();  * // 按远程文件信息对比本地文件信息  * Iterator it= remotefiles.keySet().iterator();  * while (it.hasNext())  * { String key =(String) it.next();  * FileObject localFile = localfiles.get(key); * FileObject remoteFile = remotefiles.get(key);  * if (localFile == null &&remoteFile != null)  * { doDownload(remotefiles); bl = true;}  * //根据本地和远程文件的最后修改时间判断下不下载。  * Date localFileTime =CommonStringDateUtil.parse(localFile.lasttime);  * Date remoteFileTime =CommonStringDateUtil .parse(remoteFile.lasttime);  * if(localFileTime.before(remoteFileTime)) {  * delete();doDownload(remotefiles); bl = true; }  * else { bl = false; } * } return bl; } *//** 根据文件名变化更新文件 */public boolean doUpdate(String localdir) throws IllegalStateException, IOException,FTPIllegalReplyException, FTPException, FTPDataTransferException,FTPAbortedException, FTPListParseException {Boolean bl = false;// 取远程文件信息Map<String, FileObject> remotefiles = getRemotefiles();// 取本地文件信息Map<String, FileObject> localfiles = getLocalfiles(localdir);// 按远程文件信息对比本地文件信息if (localfiles.size() == 0 && remotefiles.size() != 0) {System.out.println("本地为空");bl = true;System.out.println("开始下载远程文件");doDownload(remotefiles,localdir);System.out.println("下载完成");} else {Iterator<String> it = remotefiles.keySet().iterator();while (it.hasNext()) {String key = (String) it.next();if (!localfiles.containsKey(key)) {System.out.println("需要更新");System.gc();delete(localdir);System.out.println("删除完成");System.out.println("开始下载新文件");doDownload(remotefiles,localdir);System.out.println("下载完成");bl = true;break;} else {bl = false;}}}return bl;}/** * 取服务器文件 *  * @return * @throws FTPListParseException * @throws FTPAbortedException * @throws FTPDataTransferException * @throws FTPException * @throws FTPIllegalReplyException * @throws IOException * @throws IllegalStateException */private  Map<String, FileObject> getRemotefiles()throws IllegalStateException, IOException,FTPIllegalReplyException, FTPException, FTPDataTransferException,FTPAbortedException, FTPListParseException {FTPFile[] files = client.list();Map<String, FileObject> rtn = new HashMap<String, FileObject>();for (FTPFile file : files) {if (".".equals(file.getName()) || "..".equals(file.getName())) {continue;}FileObject o = new FileObject();o.filename = file.getName();o.lasttime = CommonStringDateUtil.format(file.getModifiedDate());rtn.put(o.filename, o);}return rtn;}/** * 取本地文件夹的所有文件信息 *  * @return */private  Map<String, FileObject> getLocalfiles(String localdir) {File f = new File(localdir);if (!f.exists()) {System.out.println("目录不存在，创建目录");f.mkdirs();}Map<String, FileObject> rtn = new HashMap<String, FileObject>();if (f.isDirectory()) {for (File file : f.listFiles()) {FileObject fo = new FileObject();fo.filename = file.getName();fo.lasttime = CommonStringDateUtil.format(new Date(file.lastModified()));rtn.put(fo.filename, fo);}}return rtn;}/** * 删除本地文件 *  */private void delete(String localdir) {File f = new File(localdir);File delFile[] = f.listFiles();int i = f.listFiles().length;for (int j = 0; j < i; j++) {delFile[j].delete();}}/** * 下载ftp服务器文件 */private  void doDownload(Map<String, FileObject> remotefiles ,String localdir)throws IllegalStateException, IOException,FTPIllegalReplyException, FTPException, FTPDataTransferException,FTPAbortedException {for (String filename : remotefiles.keySet()) {client.download(filename, new File(localdir + filename));}}public void close() throws IllegalStateException, IOException,FTPIllegalReplyException, FTPException {client.disconnect(true);}}class FileObject {String filename;String lasttime;@Overridepublic String toString() {return filename + "|" + lasttime;}}