一.客户端通信工具类：

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.OutputStream;

import java.net.SocketException;

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;

/*** 用于Android和FTP服务器进行交互的工具类*/

public class FTPUtils {

private FTPClient ftpClient = null;

private static FTPUtils ftpUtilsInstance = null;

private String ftpUrl;

private int ftpPort;

private String userName;

private String userPassword;

private final int connectTimeout = 5000;

private FTPUtils() {

ftpClient = new FTPClient();

}

/** 得到类对象实例(因为只能有一个这样的类对象，所以用单例模式)*/

public static FTPUtils getInstance() {

if (ftpUtilsInstance == null) {

ftpUtilsInstance = new FTPUtils();

}

return ftpUtilsInstance;

}

/*** 设置FTP服务器

*

*@paramFTPUrl

* FTP服务器ip地址

*@paramFTPPort

* FTP服务器端口号

*@paramUserName

* 登陆FTP服务器的账号

*@paramUserPassword

* 登陆FTP服务器的密码

*@return

*/

public boolean initFTPSetting(String FTPUrl, int FTPPort, String UserName,

String UserPassword) {

ftpUrl = FTPUrl;

ftpPort = FTPPort;

userName = UserName;

userPassword = UserPassword;

int reply;

try {

//设定连接超时时间

ftpClient.setConnectTimeout(connectTimeout);

//要连接的FTP服务器Url,Port

ftpClient.connect(FTPUrl, FTPPort);

//登陆FTP服务器

ftpClient.login(UserName, UserPassword);

//看返回的值是不是230，如果是，表示登陆成功

reply = ftpClient.getReplyCode();

if (!FTPReply.isPositiveCompletion(reply)) {

//断开

ftpClient.disconnect();

return false;

}

return true;

} catch (SocketException e) {

e.printStackTrace();

return false;

} catch (IOException e) {

e.printStackTrace();

return false;

}

}

/*** 断开FTP服务器*/

public boolean disconnectFTP(){

try {

ftpClient.disconnect();

return true;

} catch (IOException e) {

e.printStackTrace();

return false;

}

}

/*** 上传文件

*

*@paramFilePath

* 要上传文件所在SDCard的路径

*@paramFileName

* 要上传的文件的文件名(如：Sim唯一标识码)

*@returntrue为成功，false为失败*/

public boolean uploadFile(String FilePath, String FileName) {

if (!ftpClient.isConnected()) {

if (!initFTPSetting(ftpUrl, ftpPort, userName, userPassword)) {

return false;

}

}

try {

//设置存储路径//ftpClient.makeDirectory("/FtpFileTest");//ftpClient.changeWorkingDirectory("/FtpFileTest");//设置上传文件需要的一些基本信息

ftpClient.setBufferSize(1024);

ftpClient.setControlEncoding("UTF-8");

ftpClient.enterLocalPassiveMode();

ftpClient.setFileType(FTP.BINARY_FILE_TYPE);

//文件上传吧～

FileInputStream fileInputStream = new FileInputStream(FilePath);

ftpClient.storeFile(FileName, fileInputStream);

//关闭文件流

fileInputStream.close();

//退出登陆FTP，关闭ftpCLient的连接

ftpClient.logout();

ftpClient.disconnect();

} catch (IOException e) {

e.printStackTrace();

return false;

}

return true;

}

/*** 下载文件

*

*@paramFilePath

* 要存放的文件的路径

*@paramFileName

* 远程FTP服务器上的那个文件的名字

*@returntrue为成功，false为失败*/

public boolean downLoadFile(String FilePath, String FileName) {

if (!ftpClient.isConnected()) {

if (!initFTPSetting(ftpUrl, ftpPort, userName, userPassword)) {

return false;

}

}

try {

//转到指定下载目录

ftpClient.changeWorkingDirectory("/data");

//列出该目录下所有文件

FTPFile[] files = ftpClient.listFiles();

//遍历所有文件，找到指定的文件

for (FTPFile file : files) {

if (file.getName().equals(FileName)) {

//根据绝对路径初始化文件

File localFile = new File(FilePath);

//输出流

OutputStream outputStream = new FileOutputStream(localFile);

//下载文件

ftpClient.retrieveFile(file.getName(), outputStream);

//清除缓存

outputStream.flush();

//关闭流

outputStream.close();

}

}

//退出登陆FTP，关闭ftpCLient的连接

ftpClient.logout();

ftpClient.disconnect();

} catch (IOException e) {

//TODO Auto-generated catch block

e.printStackTrace();

}

return true;

}

}

二.利用Android设备作为FTP服务器，以下是FTPServer类

import java.io.File;

import java.io.IOException;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import org.apache.ftpserver.FtpServer;

import org.apache.ftpserver.FtpServerFactory;

import org.apache.ftpserver.ftplet.Authority;

import org.apache.ftpserver.ftplet.DefaultFtplet;

import org.apache.ftpserver.ftplet.FtpException;

import org.apache.ftpserver.ftplet.FtpRequest;

import org.apache.ftpserver.ftplet.FtpSession;

import org.apache.ftpserver.ftplet.Ftplet;

import org.apache.ftpserver.ftplet.FtpletResult;

import org.apache.ftpserver.ftplet.UserManager;

import org.apache.ftpserver.listener.ListenerFactory;

import org.apache.ftpserver.usermanager.PropertiesUserManagerFactory;

import org.apache.ftpserver.usermanager.SaltedPasswordEncryptor;

import org.apache.ftpserver.usermanager.impl.BaseUser;

import org.apache.ftpserver.usermanager.impl.WritePermission;

import android.os.Environment;

public class FtpServerlet extends DefaultFtplet{

private FtpServer mFtpServer;

private final int mPort = 2121;

private final String mDirectory = Environment.getExternalStorageDirectory().getPath() + "/FtpFileTest";

private final String mUser = "way";

private final String mPassword = "way";

private static FtpServerlet mInstance;

public static FtpServerlet getInstance(){

if(mInstance == null){

mInstance = new FtpServerlet();

}

return mInstance;

}

/*** FTP启动

*@throwsFtpException*/

public void start() throws FtpException {

if (null != mFtpServer && false == mFtpServer.isStopped()) {

return;

}

File file = new File(mDirectory);

if (!file.exists()) {

file.mkdirs();

}

FtpServerFactory serverFactory = new FtpServerFactory();

ListenerFactory listenerFactory = new ListenerFactory();

//设定端末番号

listenerFactory.setPort(mPort);

//通过PropertiesUserManagerFactory创建UserManager然后向配置文件添加用户

PropertiesUserManagerFactory userManagerFactory = new PropertiesUserManagerFactory();

userManagerFactory.setPasswordEncryptor(new SaltedPasswordEncryptor());

UserManager userManager = userManagerFactory.createUserManager();

List auths = new ArrayList();

Authority auth = new WritePermission();

auths.add(auth);

//添加用户

BaseUser user = new BaseUser();

user.setName(mUser);

user.setPassword(mPassword);

user.setHomeDirectory(mDirectory);

user.setAuthorities(auths);

userManager.save(user);

//设定Ftplet

Map ftpletMap = new HashMap();

ftpletMap.put("Ftplet", this);

serverFactory.setUserManager(userManager);

serverFactory.addListener("default", listenerFactory.createListener());

serverFactory.setFtplets(ftpletMap);

//创建并启动FTPServer

mFtpServer = serverFactory.createServer();

mFtpServer.start();

}

/*** FTP停止*/

public void stop() {

//FtpServer不存在和FtpServer正在运行中

if (null != mFtpServer && false == mFtpServer.isStopped()) {

mFtpServer.stop();

}

}

@Override

public FtpletResult onAppendStart(FtpSession session, FtpRequest request)

throws FtpException, IOException {

System.out.println("onAppendStart");

return super.onAppendStart(session, request);

}

@Override

public FtpletResult onAppendEnd(FtpSession session, FtpRequest request)

throws FtpException, IOException {

System.out.println("onAppendEnd");

return super.onAppendEnd(session, request);

}

@Override

public FtpletResult onLogin(FtpSession session, FtpRequest request)

throws FtpException, IOException {

System.out.println("onLogin");

return super.onLogin(session, request);

}

@Override

public FtpletResult onConnect(FtpSession session) throws FtpException,

IOException {

System.out.println("onConnect");

return super.onConnect(session);

}

@Override

public FtpletResult onDisconnect(FtpSession session) throws FtpException,

IOException {

System.out.println("onDisconnect");

return super.onDisconnect(session);

}

@Override

public FtpletResult onUploadStart(FtpSession session, FtpRequest request)

throws FtpException, IOException {

System.out.println("onUploadStart");

return super.onUploadStart(session, request);

}

@Override

public FtpletResult onUploadEnd(FtpSession session, FtpRequest request)

throws FtpException, IOException {

String FtpUploadPath = mDirectory + "/" + request.getArgument();

//接收到文件后立即删除

File uploadFile = new File(FtpUploadPath);

uploadFile.delete();

return super.onUploadEnd(session, request);

}

}

三.客户端和服务器的AndroidManifest中添加相关权限

四.所需jar包

commons-net-3.0.1.jar

ftpserver-core-1.0.6.jar

找了半天不知道怎么上传附件，只能麻烦大家自己去下载了。