Android使用ftp方式实现文件上传和下载功能

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();
 }

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客户端工具
 * 
 */
public final class FTPToolkit {

 private FTPToolkit() {
 }

 /**
 * 创建FTP连接
 * 
 * @param host
 *  主机名或IP
 * @param port
 *  ftp端口
 * @param username
 *  ftp用户名
 * @param password
 *  ftp密码
 * @return 一个客户端
 * @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下载文件到本地一个文件夹,如果本地文件夹不存在，则创建必要的目录结构
 * 
 * @param client
 *  FTP客户端
 * @param remoteFileName
 *  FTP文件
 * @param localPath
 *  存的本地文件路径或目录
 * @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上传本地文件到FTP的一个目录下
 * 
 * @param client
 *  FTP客户端
 * @param localfile
 *  本地文件
 * @param remoteFolderPath
 *  FTP上传目录
 * @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上传本地文件到FTP的一个目录下
 * 
 * @param client
 *  FTP客户端
 * @param localfilepath
 *  本地文件路径
 * @param remoteFolderPath
 *  FTP上传目录
 * @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);
 }

/**
 * 批量上传本地文件到FTP指定目录上
 * 
 * @param client
 *  FTP客户端
 * @param localFilePaths
 *  本地文件路径列表
 * @param remoteFolderPath
 *  FTP上传目录
 * @throws Exception 
 */
 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);
 }
 }
/**
 * 批量上传本地文件到FTP指定目录上
 * 
 * @param client
 *  FTP客户端
 * @param localFiles
 *  本地文件列表
 * @param remoteFolderPath
 *  FTP上传目录
 * @throws Exception 
 */
 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);
 }
 }
/**
 * 判断一个FTP路径是否存在，如果存在返回类型(FTPFile.TYPE_DIRECTORY=1、FTPFile.TYPE_FILE=0、
 * FTPFile.TYPE_LINK=2) 如果文件不存在，则返回一个-1
 * 
 * @param client
 *  FTP客户端
 * @param remotePath
 *  FTP文件或文件夹路径
 * @return 存在时候返回类型值(文件0，文件夹1，连接2)，不存在则返回-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!");
 }
 }

 /**
 * 关闭FTP连接，关闭时候像服务器发送一条关闭命令
 * 
 * @param client
 *  FTP客户端
 * @return 关闭成功，或者链接已断开，或者链接为null时候返回true，通过两次关闭都失败时候返回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;
 }
}