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();
  } 

 }
} 

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