此篇博客为整理文章，文章出处：www.cnblogs.com/xyc20080413…
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]));
