Android使用ftp方式实现文件上传和下载功能

近期在工作上一直再维护平台OTA在线升级项目，其中关于这个升级文件主要是存放于ftp服务器上的，然后客户端通过走ftp协议方式下载至本地Android机进行一个系统升级操作。那么今天将对ftp实现文件上传和下载进行一个使用总结，关于ftp这方面的理论知识如果不是太了解的各位道友，那么请移步HTTP和FTP的区别的一些理论知识 作个具体的了解或者查阅相关资料。那么先看看个人工作项目这个OTA升级效果图吧。如下：

下面是具体的接口实现：

那么相关ftp的操作，已经被封装到ota.ftp这个包下，各位童鞋可以下载示例代码慢慢研究。另外这个要是用ftp服务我们cline端需要再项目工程导入ftp4j-1.7.2.jar包

这边作个使用的逻辑分析：首先在我们的项目工程FtpApplication中启动这个OtaService，其中OtaService作为一个服务运行起来，在这个服务里面拿到封装好ftp相关接口的DownLoad.java进行ftp文件操作，关键代码如下：

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;


public final class FTPToolkit {

 private FTPToolkit() {
 }

 
 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;
 }

 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");
 }
 }

 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);
 }
 }


 public static void upload(FTPClient client, String localfilepath,
  String remoteFolderPath, MyFtpListener listener) throws Exception {
 File localfile = new File(localfilepath);
 upload(client, localfile, remoteFolderPath, listener);
 }


 public static void uploadListPath(FTPClient client,
  List 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);
 }
 }

 public static void uploadListFile(FTPClient client, List 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);
 }
 }

 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;
  // 假设推理判断
  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!");
 }
 }

 

 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;
 }
}

包括登录，开始下载，取消下载，获取升级文件版本号和服务器版本校验等。其它的是一些数据库，SD卡文件相关操作，那么最后在我们下载完成之后需要对文件进行一个文件解压再执行升级操作，这部分在ZipExtractor.java和OTAProvider.java中实现

示例代码点击下载

总结

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