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。