使用的是apache开源包commons-net-3.3.jar所提供的FTPClient

FTP服务器使用Quick Easy FTP Server 4.0.0（服务器ip为192.168.31.104，端口使用默认21端口，用户名为test，密码为123）

JDK版本为1.6，Junit使用4.8.1

FTP上传工具类：

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import org.apache.commons.net.ftp.FTPClient;

public class FTPutils {

	public static FTPClient getFTPClient(String ip, int port, String uName,

			String uPwd) {

		FTPClient ftpClient = new FTPClient();

		boolean result = true;

		try {

			// use port 21 by default

			// ftpClient.connect(ip);

			// use specific port

			ftpClient.connect(ip, port);

			if (ftpClient.isConnected()) {

				boolean flag = ftpClient.login(uName, uPwd);

				if (flag) {

					ftpClient.setControlEncoding("GBK");

					// binary file

					ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);

				} else {

					result = false;

				}

			} else {

				result = false;

			}

			if (result) {

				return ftpClient;

			} else {

				return null;

			}

		} catch (Exception e) {

			e.printStackTrace();

			return null;

		}

	}

	public static void close(InputStream in, OutputStream out,

			FTPClient ftpClient) {

		if (null != in) {

			try {

				in.close();

			} catch (IOException e) {

				e.printStackTrace();

				System.out.println("Input stream close error!");

			}

		}

		if (null != out) {

			try {

				out.close();

			} catch (IOException e) {

				e.printStackTrace();

				System.out.println("Onput stream close error!");

			}

		}

		if (null != ftpClient) {

			try {

				ftpClient.logout();

				ftpClient.disconnect();

			} catch (IOException e) {

				e.printStackTrace();

				System.out.println("Ftp client stream close error!");

			}

		}

	}

	public static boolean testUpload(String ip, int port, String uName,

			String uPwd, String fileName, String localPath, String remotePath) {

		boolean result = true;

		FileInputStream in = null;

		FTPClient ftpClient = getFTPClient(ip, port, uName, uPwd);

		if (null == ftpClient) {

			System.out.println("Get FTP client failure!");

			return false;

		}

		try {

			File file = new File(localPath + fileName);

			in = new FileInputStream(file);

			ftpClient.changeWorkingDirectory(remotePath);

			ftpClient.storeFile(fileName, in);

			return result;

		} catch (IOException e) {

			e.printStackTrace();

			return false;

		} finally {

			close(in, null, ftpClient);

		}

	}

	public static boolean testDownload(String ip, int port, String uName,

			String uPwd, String fileName, String localPath, String remotePath) {

		boolean result = true;

		FileOutputStream out = null;

		FTPClient ftpClient = getFTPClient(ip, port, uName, uPwd);

		if (null == ftpClient) {

			System.out.println("Get FTP client failure!");

			return false;

		}

		try {

			File file = new File(localPath + fileName);

			out = new FileOutputStream(file);

			ftpClient.changeWorkingDirectory(remotePath);

			ftpClient.retrieveFile(fileName, out);

			return result;

		} catch (IOException e) {

			e.printStackTrace();

			return false;

		} finally {

			close(null, out, ftpClient);

		}

	}

}

Junit测试类：

test1：上传本地e盘中up.txt文件至FTP服务器根目录下upfile文件夹中

test2：将FTP服务器根目录下downfile文件夹中的down.txt文件下载至本地e盘中

import static org.junit.Assert.*;

import org.junit.Test;

public class FTPutilsTest {

	@Test

	public void testTestUpload() {

		boolean result = FTPutils.testUpload("192.168.31.104", 21, "test", "123",

				"up.txt", "e:\\", "/upfile");

		assertTrue(result == true);

	}

	@Test

	public void testTestDownload() {

		boolean result = FTPutils.testDownload("192.168.31.104", 21, "test", "123",

				"down.txt", "e:\\", "/downfile");

		assertTrue(result == true);

	}

}

FTP服务器日志为：

04/11/2013 17:50:34.833 (000004)	 - (not logged in)	(192.168.31.104)>	220 Welcome to LZL's FTP Server V4.0.0

04/11/2013 17:50:34.835 (000004)	 - (not logged in)	(192.168.31.104)>	USER test

04/11/2013 17:50:34.836 (000004)	 - (not logged in)	(192.168.31.104)>	331 Password required for test

04/11/2013 17:50:34.837 (000004)	 - (not logged in)	(192.168.31.104)>	PASS 123

04/11/2013 17:50:34.839 (000004)	 - test	(192.168.31.104)>	230 Client :test successfully logged in. Client IP :192.168.31.104

04/11/2013 17:50:34.840 (000004)	 - test	(192.168.31.104)>	TYPE I

04/11/2013 17:50:34.841 (000004)	 - test	(192.168.31.104)>	200 Type set to I

04/11/2013 17:50:34.843 (000004)	 - test	(192.168.31.104)>	CWD /upfile

04/11/2013 17:50:34.843 (000004)	 - test	(192.168.31.104)>	250 "/upfile" is current directory.

04/11/2013 17:50:34.847 (000004)	 - test	(192.168.31.104)>	PORT 192,168,31,104,255,56

04/11/2013 17:50:34.852 (000004)	 - test	(192.168.31.104)>	200 Port command successful.

04/11/2013 17:50:34.853 (000004)	 - test	(192.168.31.104)>	STOR up.txt

04/11/2013 17:50:34.895 (000004)	 - test	(192.168.31.104)>	150 Opening BINARY mode data connection for file transfer.

04/11/2013 17:50:34.902 (000004)	 - test	(192.168.31.104)>	226 Transfer complete.

04/11/2013 17:50:34.903 (000004)	 - test	(192.168.31.104)>	QUIT

04/11/2013 17:50:34.904 (000004)	 - test	(192.168.31.104)>	220 Bye

04/11/2013 17:50:34.912 (000004)	 - test	(192.168.31.104)>	Client :test disconnected from 192.168.31.104

04/11/2013 17:50:34.920 (000005)	 - (not logged in)	(192.168.31.104)>	220 Welcome to LZL's FTP Server V4.0.0

04/11/2013 17:50:34.921 (000005)	 - (not logged in)	(192.168.31.104)>	USER test

04/11/2013 17:50:34.922 (000005)	 - (not logged in)	(192.168.31.104)>	331 Password required for test

04/11/2013 17:50:34.922 (000005)	 - (not logged in)	(192.168.31.104)>	PASS 123

04/11/2013 17:50:34.932 (000005)	 - test	(192.168.31.104)>	230 Client :test successfully logged in. Client IP :192.168.31.104

04/11/2013 17:50:34.948 (000005)	 - test	(192.168.31.104)>	TYPE I

04/11/2013 17:50:34.958 (000005)	 - test	(192.168.31.104)>	200 Type set to I

04/11/2013 17:50:34.974 (000005)	 - test	(192.168.31.104)>	CWD /downfile

04/11/2013 17:50:34.984 (000005)	 - test	(192.168.31.104)>	250 "/downfile" is current directory.

04/11/2013 17:50:34.994 (000005)	 - test	(192.168.31.104)>	PORT 192,168,31,104,255,59

04/11/2013 17:50:35.008 (000005)	 - test	(192.168.31.104)>	200 Port command successful.

04/11/2013 17:50:35.016 (000005)	 - test	(192.168.31.104)>	RETR down.txt

04/11/2013 17:50:35.026 (000005)	 - test	(192.168.31.104)>	150 Opening BINARY mode data connection for file transfer.

04/11/2013 17:50:35.041 (000005)	 - test	(192.168.31.104)>	226 Transfer complete.

04/11/2013 17:50:35.050 (000005)	 - test	(192.168.31.104)>	QUIT

04/11/2013 17:50:35.090 (000005)	 - test	(192.168.31.104)>	220 Bye

04/11/2013 17:50:35.116 (000005)	 - test	(192.168.31.104)>	Client :test disconnected from 192.168.31.104

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