近期在工作上一直再維護平臺OTA在線升級項目，其中關(guān)于這個升級文件主要是存放于ftp服務(wù)器上的，然后客戶端通過走ftp協(xié)議方式下載至本地Android機進行一個系統(tǒng)升級操作。那么今天將對ftp實現(xiàn)文件上傳和下載進行一個使用總結(jié)，關(guān)于ftp這方面的理論知識如果不是太了解的各位道友，那么請移步HTTP和FTP的區(qū)別的一些理論知識 作個具體的了解或者查閱相關(guān)資料。那么先看看個人工作項目這個OTA升級效果圖吧。如下：

下面是具體的接口實現(xiàn)：

那么相關(guān)ftp的操作，已經(jīng)被封裝到ota.ftp這個包下，各位童鞋可以下載示例代碼慢慢研究。另外這個要是用ftp服務(wù)我們cline端需要再項目工程導(dǎo)入ftp4j-1.7.2.jar包

這邊作個使用的邏輯分析：首先在我們的項目工程FtpApplication中啟動這個OtaService，其中OtaService作為一個服務(wù)運行起來，在這個服務(wù)里面拿到封裝好ftp相關(guān)接口的DownLoad.java進行ftp文件操作，關(guān)鍵代碼如下：

public void startDownload() { // TODO Auto-generated method stub mDownLoad.start(); } public void stopDownload() { mDownLoad.stop(); } public void cancel() { mDownLoad.cancel(); } public String getOldDate() { return mDownLoad.getDatabaseOldDate(); } public String getOldVersion() { return mDownLoad.getDatabaseOldVersion(); } public void checkVer(String serverRoot) { // TODO Auto-generated method stub mDownLoad = DownLoad.getInstance(); mDownLoad.setServeRoot(serverRoot); mDownLoad.setFtpInfo(mApp.mFtpInfo); mDownLoad.checkUpgrade(); }

FTPToolkit.java

package com.asir.ota.ftp;import it.sauronsoftware.ftp4j.FTPClient; import it.sauronsoftware.ftp4j.FTPFile;import java.io.File;import java.util.List;import com.asir.ota.clinet.PathToolkit;import com.asir.ota.ftp.DownLoad.MyFtpListener;/** * FTP客戶端工具 * */public final class FTPToolkit { private FTPToolkit() { } /** * 創(chuàng)建FTP連接 * * @param host * 主機名或IP * @param port * ftp端口 * @param username * ftp用戶名 * @param password * ftp密碼 * @return 一個客戶端 * @throws Exception */ public static FTPClient makeFtpConnection(String host, int port, String username, String password) throws Exception { FTPClient client = new FTPClient(); try { client.connect(host, port); if(username != null && password != null) { client.login(username, password); } } catch (Exception e) { throw new Exception(e); } return client; }/** * FTP下載文件到本地一個文件夾,如果本地文件夾不存在，則創(chuàng)建必要的目錄結(jié)構(gòu) * * @param client * FTP客戶端 * @param remoteFileName * FTP文件 * @param localPath * 存的本地文件路徑或目錄 * @throws Exception */ public static void download(FTPClient client, String remoteFileName, String localPath, long startPoint, MyFtpListener listener) throws Exception { String localfilepath = localPath; int x = isExist(client, remoteFileName); File localFile = new File(localPath); if (localFile.isDirectory()) { if (!localFile.exists()) localFile.mkdirs(); localfilepath = PathToolkit.formatPath4File(localPath + File.separator + new File(remoteFileName).getName()); } if (x == FTPFile.TYPE_FILE) { try { if (listener != null) client.download(remoteFileName, new File(localfilepath), startPoint, listener); else client.download(remoteFileName, new File(localfilepath), startPoint); } catch (Exception e) { throw new Exception(e); } } else { throw new Exception('the target ' + remoteFileName + 'not exist'); } }/** * FTP上傳本地文件到FTP的一個目錄下 * * @param client * FTP客戶端 * @param localfile * 本地文件 * @param remoteFolderPath * FTP上傳目錄 * @throws Exception */ public static void upload(FTPClient client, File localfile, String remoteFolderPath, MyFtpListener listener) throws Exception { remoteFolderPath = PathToolkit.formatPath4FTP(remoteFolderPath); try { client.changeDirectory(remoteFolderPath); if (!localfile.exists()) throw new Exception('the upload FTP file' + localfile.getPath() + 'not exist!'); if (!localfile.isFile()) throw new Exception('the upload FTP file' + localfile.getPath() + 'is a folder!'); if (listener != null) client.upload(localfile, listener); else client.upload(localfile); client.changeDirectory('/'); } catch (Exception e) { throw new Exception(e); } }/** * FTP上傳本地文件到FTP的一個目錄下 * * @param client * FTP客戶端 * @param localfilepath * 本地文件路徑 * @param remoteFolderPath * FTP上傳目錄 * @throws Exception */ public static void upload(FTPClient client, String localfilepath, String remoteFolderPath, MyFtpListener listener) throws Exception { File localfile = new File(localfilepath); upload(client, localfile, remoteFolderPath, listener); }/** * 批量上傳本地文件到FTP指定目錄上 * * @param client * FTP客戶端 * @param localFilePaths * 本地文件路徑列表 * @param remoteFolderPath * FTP上傳目錄 * @throws Exception */ public static void uploadListPath(FTPClient client, List<String> localFilePaths, String remoteFolderPath, MyFtpListener listener) throws Exception { remoteFolderPath = PathToolkit.formatPath4FTP(remoteFolderPath); try { client.changeDirectory(remoteFolderPath); for (String path : localFilePaths) { File file = new File(path); if (!file.exists()) throw new Exception('the upload FTP file' + path + 'not exist!'); if (!file.isFile()) throw new Exception('the upload FTP file' + path + 'is a folder!'); if (listener != null) client.upload(file, listener); else client.upload(file); } client.changeDirectory('/'); } catch (Exception e) { throw new Exception(e); } }/** * 批量上傳本地文件到FTP指定目錄上 * * @param client * FTP客戶端 * @param localFiles * 本地文件列表 * @param remoteFolderPath * FTP上傳目錄 * @throws Exception */ public static void uploadListFile(FTPClient client, List<File> localFiles, String remoteFolderPath, MyFtpListener listener) throws Exception { try { client.changeDirectory(remoteFolderPath); remoteFolderPath = PathToolkit.formatPath4FTP(remoteFolderPath); for (File file : localFiles) { if (!file.exists()) throw new Exception('the upload FTP file' + file.getPath() + 'not exist!'); if (!file.isFile()) throw new Exception('the upload FTP file' + file.getPath() + 'is a folder!'); if (listener != null) client.upload(file, listener); else client.upload(file); } client.changeDirectory('/'); } catch (Exception e) { throw new Exception(e); } }/** * 判斷一個FTP路徑是否存在，如果存在返回類型(FTPFile.TYPE_DIRECTORY=1、FTPFile.TYPE_FILE=0、 * FTPFile.TYPE_LINK=2) 如果文件不存在，則返回一個-1 * * @param client * FTP客戶端 * @param remotePath * FTP文件或文件夾路徑 * @return 存在時候返回類型值(文件0，文件夾1，連接2)，不存在則返回-1 */ public static int isExist(FTPClient client, String remotePath) { remotePath = PathToolkit.formatPath4FTP(remotePath); FTPFile[] list = null; try { list = client.list(remotePath); } catch (Exception e) { return -1; } if (list.length > 1) return FTPFile.TYPE_DIRECTORY; else if (list.length == 1) { FTPFile f = list[0]; if (f.getType() == FTPFile.TYPE_DIRECTORY) return FTPFile.TYPE_DIRECTORY; // 假設(shè)推理判斷 String _path = remotePath + '/' + f.getName(); try { int y = client.list(_path).length; if (y == 1) return FTPFile.TYPE_DIRECTORY; else return FTPFile.TYPE_FILE; } catch (Exception e) { return FTPFile.TYPE_FILE; } } else { try { client.changeDirectory(remotePath); return FTPFile.TYPE_DIRECTORY; } catch (Exception e) { return -1; } } }public static long getFileLength(FTPClient client, String remotePath) throws Exception { String remoteFormatPath = PathToolkit.formatPath4FTP(remotePath); if(isExist(client, remotePath) == 0) { FTPFile[] files = client.list(remoteFormatPath); return files[0].getSize(); }else { throw new Exception('get remote file length error!'); } } /** * 關(guān)閉FTP連接，關(guān)閉時候像服務(wù)器發(fā)送一條關(guān)閉命令 * * @param client * FTP客戶端 * @return 關(guān)閉成功，或者鏈接已斷開，或者鏈接為null時候返回true，通過兩次關(guān)閉都失敗時候返回false */ public static boolean closeConnection(FTPClient client) { if (client == null) return true; if (client.isConnected()) { try { client.disconnect(true); return true; } catch (Exception e) { try { client.disconnect(false); } catch (Exception e1) { e1.printStackTrace(); return false; } } } return true; }}

包括登錄，開始下載，取消下載，獲取升級文件版本號和服務(wù)器版本校驗等。其它的是一些數(shù)據(jù)庫，SD卡文件相關(guān)操作，那么最后在我們下載完成之后需要對文件進行一個文件解壓再執(zhí)行升級操作，這部分在ZipExtractor.java和OTAProvider.java中實現(xiàn)

示例代碼點擊下載

總結(jié)

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