Android关于FTP文件上传和下载功能详解

本文实例为大家分享了Android九宫格图片展示的具体代码，供大家参考，具体内容如下

此篇博客为整理文章，供大家学习。

1.首先下载commons-net jar包，可以百度下载。

FTP的文件上传和下载的工具类：

package ryancheng.example.progressbar; 
 
import java.io.File; 
import java.io.FileOutputStream; 
import java.io.InputStream; 
import java.io.OutputStream; 
import java.io.RandomAccessFile; 
import org.apache.commons.net.ftp.FTP; 
import org.apache.commons.net.ftp.FTPClient; 
import org.apache.commons.net.ftp.FTPFile; 
import org.apache.commons.net.ftp.FTPReply; 
import android.os.Environment; 
 
public class FTPManager { 
 FTPClient ftpClient = null; 
 
 public FTPManager() { 
  ftpClient = new FTPClient(); 
 } 
 
 // 连接到ftp服务器 
 public synchronized boolean connect() throws Exception { 
  boolean bool = false; 
  if (ftpClient.isConnected()) {//判断是否已登陆 
   ftpClient.disconnect(); 
  } 
  ftpClient.setDataTimeout(20000);//设置连接超时时间 
  ftpClient.setControlEncoding("utf-8"); 
  ftpClient.connect("ip地址", 端口); 
  if (FTPReply.isPositiveCompletion(ftpClient.getReplyCode())) { 
   if (ftpClient.login("用户名", "密码")) { 
    bool = true; 
    System.out.println("ftp连接成功"); 
   } 
  } 
  return bool; 
 } 
 
 // 创建文件夹 
 public boolean createDirectory(String path) throws Exception { 
  boolean bool = false; 
  String directory = path.substring(0, path.lastIndexOf("/") + 1); 
  int start = 0; 
  int end = 0; 
  if (directory.startsWith("/")) { 
   start = 1; 
  } 
  end = directory.indexOf("/", start); 
  while (true) { 
   String subDirectory = directory.substring(start, end); 
   if (!ftpClient.changeWorkingDirectory(subDirectory)) { 
    ftpClient.makeDirectory(subDirectory); 
    ftpClient.changeWorkingDirectory(subDirectory); 
    bool = true; 
   } 
   start = end + 1; 
   end = directory.indexOf("/", start); 
   if (end == -1) { 
    break; 
   } 
  } 
  return bool; 
 } 
 
 // 实现上传文件的功能 
 public synchronized boolean uploadFile(String localPath, String serverPath) 
   throws Exception { 
  // 上传文件之前，先判断本地文件是否存在 
  File localFile = new File(localPath); 
  if (!localFile.exists()) { 
   System.out.println("本地文件不存在"); 
   return false; 
  } 
  System.out.println("本地文件存在，名称为：" + localFile.getName()); 
  createDirectory(serverPath); // 如果文件夹不存在，创建文件夹 
  System.out.println("服务器文件存放路径：" + serverPath + localFile.getName()); 
  String fileName = localFile.getName(); 
  // 如果本地文件存在，服务器文件也在，上传文件，这个方法中也包括了断点上传 
  long localSize = localFile.length(); // 本地文件的长度 
  FTPFile[] files = ftpClient.listFiles(fileName); 
  long serverSize = 0; 
  if (files.length == 0) { 
   System.out.println("服务器文件不存在"); 
   serverSize = 0; 
  } else { 
   serverSize = files[0].getSize(); // 服务器文件的长度 
  } 
  if (localSize <= serverSize) { 
   if (ftpClient.deleteFile(fileName)) { 
    System.out.println("服务器文件存在,删除文件,开始重新上传"); 
    serverSize = 0; 
   } 
  } 
  RandomAccessFile raf = new RandomAccessFile(localFile, "r"); 
  // 进度 
  long step = localSize / 100; 
  long process = 0; 
  long currentSize = 0; 
  // 好了，正式开始上传文件 
  ftpClient.enterLocalPassiveMode(); 
  ftpClient.setFileType(FTP.BINARY_FILE_TYPE); 
  ftpClient.setRestartOffset(serverSize); 
  raf.seek(serverSize); 
  OutputStream output = ftpClient.appendFileStream(fileName); 
  byte[] b = new byte[1024]; 
  int length = 0; 
  while ((length = raf.read(b)) != -1) { 
   output.write(b, 0, length); 
   currentSize = currentSize + length; 
   if (currentSize / step != process) { 
    process = currentSize / step; 
    if (process % 10 == 0) { 
     System.out.println("上传进度：" + process); 
    } 
   } 
  } 
  output.flush(); 
  output.close(); 
  raf.close(); 
  if (ftpClient.completePendingCommand()) { 
   System.out.println("文件上传成功"); 
   return true; 
  } else { 
   System.out.println("文件上传失败"); 
   return false; 
  } 
 } 
 
 // 实现下载文件功能，可实现断点下载 
 public synchronized boolean downloadFile(String localPath, String serverPath) 
   throws Exception { 
  // 先判断服务器文件是否存在 
  FTPFile[] files = ftpClient.listFiles(serverPath); 
  if (files.length == 0) { 
   System.out.println("服务器文件不存在"); 
   return false; 
  } 
  System.out.println("远程文件存在,名字为：" + files[0].getName()); 
  localPath = localPath + files[0].getName(); 
  // 接着判断下载的文件是否能断点下载 
  long serverSize = files[0].getSize(); // 获取远程文件的长度 
  File localFile = new File(localPath); 
  long localSize = 0; 
  if (localFile.exists()) { 
   localSize = localFile.length(); // 如果本地文件存在，获取本地文件的长度 
   if (localSize >= serverSize) { 
    System.out.println("文件已经下载完了"); 
    File file = new File(localPath); 
    file.delete(); 
    System.out.println("本地文件存在，删除成功，开始重新下载"); 
    return false; 
   } 
  } 
  // 进度 
  long step = serverSize / 100; 
  long process = 0; 
  long currentSize = 0; 
  // 开始准备下载文件 
  ftpClient.enterLocalActiveMode(); 
  ftpClient.setFileType(FTP.BINARY_FILE_TYPE); 
  OutputStream out = new FileOutputStream(localFile, true); 
  ftpClient.setRestartOffset(localSize); 
  InputStream input = ftpClient.retrieveFileStream(serverPath); 
  byte[] b = new byte[1024]; 
  int length = 0; 
  while ((length = input.read(b)) != -1) { 
   out.write(b, 0, length); 
   currentSize = currentSize + length; 
   if (currentSize / step != process) { 
    process = currentSize / step; 
    if (process % 10 == 0) { 
     System.out.println("下载进度：" + process); 
    } 
   } 
  } 
  out.flush(); 
  out.close(); 
  input.close(); 
  // 此方法是来确保流处理完毕，如果没有此方法，可能会造成现程序死掉 
  if (ftpClient.completePendingCommand()) { 
   System.out.println("文件下载成功"); 
   return true; 
  } else { 
   System.out.println("文件下载失败"); 
   return false; 
  } 
 } 
 
 // 如果ftp上传打开，就关闭掉 
 public void closeFTP() throws Exception { 
  if (ftpClient.isConnected()) { 
   ftpClient.disconnect(); 
  } 
 } 
}

具体实现看代码注释写的很详细。

一.Android中FTP文件上传代码：

// 上传例子 
private void ftpUpload() { 
 new Thread() { 
 public void run() { 
  try { 
  System.out.println("正在连接ftp服务器...."); 
  FTPManager ftpManager = new FTPManager(); 
  if (ftpManager.connect()) { 
  if (ftpManager.uploadFile(ftpManager.rootPath + "UpdateXZMarketPlatform.apk", "mnt/sdcard/")) { 
  ftpManager.closeFTP(); 
  } 
  } 
  } catch (Exception e) { 
  // TODO: handle exception 
  // System.out.println(e.getMessage()); 
  } 
 } 
 }.start(); 
 }

二.Android中FTP文件下载代码：

// 下载例子 
private void ftpDownload() { 
 new Thread() { 
 public void run() { 
  try { 
  System.out.println("正在连接ftp服务器...."); 
  FTPManager ftpManager = new FTPManager(); 
  if (ftpManager.connect()) { 
  if (ftpManager.downloadFile(ftpManager.rootPath, "20120723_XFQ07_XZMarketPlatform.db")) { 
  ftpManager.closeFTP(); 
  } 
  } 
  } catch (Exception e) { 
  // TODO: handle exception 
  // System.out.println(e.getMessage()); 
  } 
 } 
 }.start(); 
 }

自己之前做项目的时候写过的FTP上传代码：

package com.kandao.yunbell.videocall; 
 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileNotFoundException; 
import java.io.IOException; 
import java.io.UnsupportedEncodingException; 
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 com.kandao.yunbell.common.SysApplication; 
 
import android.content.Context; 
import android.util.Log; 
 
public class MyUploadThread extends Thread { 
 private String fileName;// 文件名字 
 private String filePath;// 文件本地路径 
 private String fileStoragePath;// 文件服务器存储路径 
 private String serverAddress;// 服务器地址 
 private String ftpUserName;// ftp账号 
 private String ftpPassword;// ftp密码 
 private Context mContext; 
 public MyUploadThread() { 
  super(); 
  // TODO Auto-generated constructor stub 
 } 
 
 public MyUploadThread(Context mContext,String fileName, String filePath, 
    String fileStoragePath,String serverAddress,String ftpUserName,String ftpPassword) { 
  super(); 
  this.fileName = fileName; 
  this.filePath = filePath; 
  this.fileStoragePath = fileStoragePath; 
  this.serverAddress = serverAddress; 
  this.ftpUserName = ftpUserName; 
  this.ftpPassword = ftpPassword; 
  this.mContext=mContext; 
 } 
 
 @Override 
 public void run() { 
  super.run(); 
  try { 
   FileInputStream fis=null; 
   FTPClient ftpClient = new FTPClient(); 
   String[] idPort = serverAddress.split(":"); 
   ftpClient.connect(idPort[0], Integer.parseInt(idPort[1])); 
   int returnCode = ftpClient.getReplyCode(); 
   Log.i("caohai", "returnCode,upload:"+returnCode); 
   boolean loginResult = ftpClient.login(ftpUserName, ftpPassword); 
   Log.i("caohai", "loginResult:"+loginResult); 
   if (loginResult && FTPReply.isPositiveCompletion(returnCode)) {// 如果登录成功 
     
    // 设置上传目录 
     
    if (((SysApplication) mContext).getIsVideo()) { 
     ((SysApplication) mContext).setIsVideo(false); 
     boolean ff=ftpClient.changeWorkingDirectory(fileStoragePath + "/video/"); 
     Log.i("caohai", "ff:"+ff); 
    }else{ 
    boolean ee=ftpClient.changeWorkingDirectory(fileStoragePath + "/photo/"); 
    Log.i("caohai", "ee:"+ee); 
    } 
    ftpClient.setBufferSize(1024); 
    // ftpClient.setControlEncoding("iso-8859-1"); 
    // ftpClient.enterLocalPassiveMode(); 
    ftpClient.setFileType(FTP.BINARY_FILE_TYPE); 
     fis = new FileInputStream(filePath + "/" 
      + fileName); 
     Log.i("caohai", "fileStoragePath00000:"+fileStoragePath); 
    String[] path = fileStoragePath.split("visitorRecord"); 
     
    boolean fs = ftpClient.storeFile(new String((path[1] 
      + "/photo/" + fileName).getBytes(), "iso-8859-1"), fis); 
    Log.i("caohai", "shifoushangchuanchenggong:"+fs); 
    fis.close(); 
    ftpClient.logout(); 
    //ftpClient.disconnect(); 
   } else {// 如果登录失败 
    ftpClient.disconnect(); 
   } 
  } catch (NumberFormatException e) { 
   // TODO Auto-generated catch block 
   e.printStackTrace(); 
  } catch (SocketException e) { 
   // TODO Auto-generated catch block 
   e.printStackTrace(); 
  } catch (FileNotFoundException e) { 
   // TODO Auto-generated catch block 
   e.printStackTrace(); 
  } catch (UnsupportedEncodingException e) { 
   // TODO Auto-generated catch block 
   e.printStackTrace(); 
  } catch (IOException e) { 
   // TODO Auto-generated catch block 
   e.printStackTrace(); 
  } 
 
 } 
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。