Java实现FTP文件与文件夹的上传和下载
作者：一个弱者想变强
本文主要分享了Java实现文件上传和下载的具体实例，分为单个文件的上传与下载和整个文件夹的上传与下载。具有很好的参考价值，需要的朋友一起来看下吧
FTP 是File Transfer Protocol（文件传输协议）的英文简称，而中文简称为“文传协议”。用于Internet上的控制文件的双向传输。同时，它也是一个应用程序（Application）。基于不同的操作系统有不同的FTP应用程序，而所有这些应用程序都遵守同一种协议以传输文件。在FTP的使用当中，用户经常遇到两个概念："下载"（Download）和"上传"（Upload）。"下载"文件就是从远程主机拷贝文件至自己的计算机上；"上传"文件就是将文件从自己的计算机中拷贝至远程主机上。用Internet语言来说，用户可通过客户机程序向（从）远程主机上传（下载）文件。
首先下载了Serv-U将自己的电脑设置为了FTP文件服务器，方便操作。下面代码的使用都是在FTP服务器已经创建，并且要在代码中写好FTP连接的相关数据才可以完成。
1.FTP文件的上传与下载(注意是单个文件的上传与下载)
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
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;
/**
* 实现FTP文件上传和文件下载
*/
public class FtpApche {
private static FTPClient ftpClient = new FTPClient();
private static String encoding = System.getProperty("file.encoding");
/**
* Description: 向FTP服务器上传文件
*
* @Version1.0
* @param url
* FTP服务器hostname
* @param port
* FTP服务器端口
* @param username
* FTP登录账号
* @param password
* FTP登录密码
* @param path
* FTP服务器保存目录,如果是根目录则为“/”
* @param filename
* 上传到FTP服务器上的文件名
* @param input
* 本地文件输入流
* @return 成功返回true，否则返回false
*/
public static boolean uploadFile(String url, int port, String username,
String password, String path, String filename, InputStream input) {
boolean result = false;
try {
int reply;
// 如果采用默认端口，可以使用ftp.connect(url)的方式直接连接FTP服务器
ftpClient.connect(url);
// ftp.connect(url, port);// 连接FTP服务器
// 登录
ftpClient.login(username, password);
ftpClient.setControlEncoding(encoding);
// 检验是否连接成功
reply = ftpClient.getReplyCode();
if (!FTPReply.isPositiveCompletion(reply)) {
System.out.println("连接失败");
ftpClient.disconnect();
return result;
}
// 转移工作目录至指定目录下
boolean change = ftpClient.changeWorkingDirectory(path);
ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
if (change) {
result = ftpClient.storeFile(new String(filename.getBytes(encoding),"iso-8859-1"), input);
if (result) {
System.out.println("上传成功!");
}
}
input.close();
ftpClient.logout();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (ftpClient.isConnected()) {
try {
ftpClient.disconnect();
} catch (IOException ioe) {
}
}
}
return result;
}
/**
* 将本地文件上传到FTP服务器上
*
*/
public void testUpLoadFromDisk() {
try {
FileInputStream in = new FileInputStream(new File("D:/test02/list.txt"));
boolean flag = uploadFile("10.0.0.102", 21, "admin","123456", "/", "lis.txt", in);
System.out.println(flag);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
/**
* Description: 从FTP服务器下载文件
*
* @Version1.0
* @param url
* FTP服务器hostname
* @param port
* FTP服务器端口
* @param username
* FTP登录账号
* @param password
* FTP登录密码
* @param remotePath
* FTP服务器上的相对路径
* @param fileName
* 要下载的文件名
* @param localPath
* 下载后保存到本地的路径
* @return
*/
public static boolean downFile(String url, int port, String username,
String password, String remotePath, String fileName,
String localPath) {
boolean result = false;
try {
int reply;
ftpClient.setControlEncoding(encoding);
/*
* 为了上传和下载中文文件，有些地方建议使用以下两句代替
* new String(remotePath.getBytes(encoding),"iso-8859-1")转码。
* 经过测试，通不过。
*/
// FTPClientConfig conf = new FTPClientConfig(FTPClientConfig.SYST_NT);
// conf.setServerLanguageCode("zh");
ftpClient.connect(url, port);
// 如果采用默认端口，可以使用ftp.connect(url)的方式直接连接FTP服务器
ftpClient.login(username, password);// 登录
// 设置文件传输类型为二进制
ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
// 获取ftp登录应答代码
reply = ftpClient.getReplyCode();
// 验证是否登陆成功
if (!FTPReply.isPositiveCompletion(reply)) {
ftpClient.disconnect();
System.err.println("FTP server refused connection.");
return result;
}
// 转移到FTP服务器目录至指定的目录下
ftpClient.changeWorkingDirectory(new String(remotePath.getBytes(encoding),"iso-8859-1"));
// 获取文件列表
FTPFile[] fs = ftpClient.listFiles();
for (FTPFile ff : fs) {
if (ff.getName().equals(fileName)) {
File localFile = new File(localPath + "/" + ff.getName());
OutputStream is = new FileOutputStream(localFile);
ftpClient.retrieveFile(ff.getName(), is);
is.close();
}
}
ftpClient.logout();
result = true;
} catch (IOException e) {
e.printStackTrace();
} finally {
if (ftpClient.isConnected()) {
try {
ftpClient.disconnect();
} catch (IOException ioe) {
}
}
}
return result;
}
/**
* 将FTP服务器上文件下载到本地
*
*/
public void testDownFile() {
try {
boolean flag = downFile("10.0.0.102", 21, "admin",
"123456", "/", "ip.txt", "E:/");
System.out.println(flag);
} catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
FtpApche fa = new FtpApche();
fa.testDownFile();
fa.testUpLoadFromDisk();
}
}
2.FTP文件夹的上传与下载(注意是整个文件夹)
package ftp;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.TimeZone;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPClientConfig;
import org.apache.commons.net.ftp.FTPFile;
import org.apache.commons.net.ftp.FTPReply;
import org.apache.log4j.Logger;
public class FTPTest_04 {
private FTPClient ftpClient;
private String strIp;
private int intPort;
private String user;
private String password;
private static Logger logger = Logger.getLogger(FTPTest_04.class.getName());
/* *
* Ftp构造函数
*/
public FTPTest_04(String strIp, int intPort, String user, String Password) {
this.strIp = strIp;
this.intPort = intPort;
this.user = user;
this.password = Password;
this.ftpClient = new FTPClient();
}
/**
* @return 判断是否登入成功
* */
public boolean ftpLogin() {
boolean isLogin = false;
FTPClientConfig ftpClientConfig = new FTPClientConfig();
ftpClientConfig.setServerTimeZoneId(TimeZone.getDefault().getID());
this.ftpClient.setControlEncoding("GBK");
this.ftpClient.configure(ftpClientConfig);
try {
if (this.intPort > 0) {
this.ftpClient.connect(this.strIp, this.intPort);
}else {
this.ftpClient.connect(this.strIp);
}
// FTP服务器连接回答
int reply = this.ftpClient.getReplyCode();
if (!FTPReply.isPositiveCompletion(reply)) {
this.ftpClient.disconnect();
logger.error("登录FTP服务失败！");
return isLogin;
}
this.ftpClient.login(this.user, this.password);
// 设置传输协议
this.ftpClient.enterLocalPassiveMode();
this.ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
logger.info("恭喜" + this.user + "成功登陆FTP服务器");
isLogin = true;
}catch (Exception e) {
e.printStackTrace();
logger.error(this.user + "登录FTP服务失败！" + e.getMessage());
}
this.ftpClient.setBufferSize(1024 * 2);
this.ftpClient.setDataTimeout(30 * 1000);
return isLogin;
}
/**
* @退出关闭服务器链接
* */
public void ftpLogOut() {
if (null != this.ftpClient && this.ftpClient.isConnected()) {
try {
boolean reuslt = this.ftpClient.logout();// 退出FTP服务器
if (reuslt) {
logger.info("成功退出服务器");
}
}catch (IOException e) {
e.printStackTrace();
logger.warn("退出FTP服务器异常！" + e.getMessage());
}finally {
try {
this.ftpClient.disconnect();// 关闭FTP服务器的连接
}catch (IOException e) {
e.printStackTrace();
logger.warn("关闭FTP服务器的连接异常！");
}
}
}
}
/***
* 上传Ftp文件
* @param localFile 当地文件
* @param romotUpLoadePath上传服务器路径 - 应该以/结束
* */
public boolean uploadFile(File localFile, String romotUpLoadePath) {
BufferedInputStream inStream = null;
boolean success = false;
try {
this.ftpClient.changeWorkingDirectory(romotUpLoadePath);// 改变工作路径
inStream = new BufferedInputStream(new FileInputStream(localFile));
logger.info(localFile.getName() + "开始上传.....");
success = this.ftpClient.storeFile(localFile.getName(), inStream);
if (success == true) {
logger.info(localFile.getName() + "上传成功");
return success;
}
}catch (FileNotFoundException e) {
e.printStackTrace();
logger.error(localFile + "未找到");
}catch (IOException e) {
e.printStackTrace();
}finally {
if (inStream != null) {
try {
inStream.close();
}catch (IOException e) {
e.printStackTrace();
}
}
}
return success;
}
/***
* 下载文件
* @param remoteFileName 待下载文件名称
* @param localDires 下载到当地那个路径下
* @param remoteDownLoadPath remoteFileName所在的路径
* */
public boolean downloadFile(String remoteFileName, String localDires,
String remoteDownLoadPath) {
String strFilePath = localDires + remoteFileName;
BufferedOutputStream outStream = null;
boolean success = false;
try {
this.ftpClient.changeWorkingDirectory(remoteDownLoadPath);
outStream = new BufferedOutputStream(new FileOutputStream(
strFilePath));
logger.info(remoteFileName + "开始下载....");
success = this.ftpClient.retrieveFile(remoteFileName, outStream);
if (success == true) {
logger.info(remoteFileName + "成功下载到" + strFilePath);
return success;
}
}catch (Exception e) {
e.printStackTrace();
logger.error(remoteFileName + "下载失败");
}finally {
if (null != outStream) {
try {
outStream.flush();
outStream.close();
}catch (IOException e) {
e.printStackTrace();
}
}
}
if (success == false) {
logger.error(remoteFileName + "下载失败!!!");
}
return success;
}
/***
* @上传文件夹
* @param localDirectory
* 当地文件夹
* @param remoteDirectoryPath
* Ftp 服务器路径 以目录"/"结束
* */
public boolean uploadDirectory(String localDirectory,
String remoteDirectoryPath) {
File src = new File(localDirectory);
try {
remoteDirectoryPath = remoteDirectoryPath + src.getName() + "/";
boolean makeDirFlag = this.ftpClient.makeDirectory(remoteDirectoryPath);
System.out.println("localDirectory : " + localDirectory);
System.out.println("remoteDirectoryPath : " + remoteDirectoryPath);
System.out.println("src.getName() : " + src.getName());
System.out.println("remoteDirectoryPath : " + remoteDirectoryPath);
System.out.println("makeDirFlag : " + makeDirFlag);
// ftpClient.listDirectories();
}catch (IOException e) {
e.printStackTrace();
logger.info(remoteDirectoryPath + "目录创建失败");
}
File[] allFile = src.listFiles();
for (int currentFile = 0;currentFile < allFile.length;currentFile++) {
if (!allFile[currentFile].isDirectory()) {
String srcName = allFile[currentFile].getPath().toString();
uploadFile(new File(srcName), remoteDirectoryPath);
}
}
for (int currentFile = 0;currentFile < allFile.length;currentFile++) {
if (allFile[currentFile].isDirectory()) {
// 递归
uploadDirectory(allFile[currentFile].getPath().toString(),
remoteDirectoryPath);
}
}
return true;
}
/***
* @下载文件夹
* @param localDirectoryPath本地地址
* @param remoteDirectory 远程文件夹
* */
public boolean downLoadDirectory(String localDirectoryPath,String remoteDirectory) {
try {
String fileName = new File(remoteDirectory).getName();
localDirectoryPath = localDirectoryPath + fileName + "//";
new File(localDirectoryPath).mkdirs();
FTPFile[] allFile = this.ftpClient.listFiles(remoteDirectory);
for (int currentFile = 0;currentFile < allFile.length;currentFile++) {
if (!allFile[currentFile].isDirectory()) {
downloadFile(allFile[currentFile].getName(),localDirectoryPath, remoteDirectory);
}
}
for (int currentFile = 0;currentFile < allFile.length;currentFile++) {
if (allFile[currentFile].isDirectory()) {
String strremoteDirectoryPath = remoteDirectory + "/"+ allFile[currentFile].getName();
downLoadDirectory(localDirectoryPath,strremoteDirectoryPath);
}
}
}catch (IOException e) {
e.printStackTrace();
logger.info("下载文件夹失败");
return false;
}
return true;
}
// FtpClient的Set 和 Get 函数
public FTPClient getFtpClient() {
return ftpClient;
}
public void setFtpClient(FTPClient ftpClient) {
this.ftpClient = ftpClient;
}
public static void main(String[] args) throws IOException {
FTPTest_04 ftp=new FTPTest_04("10.0.0.102",21,"admin","123456");
ftp.ftpLogin();
System.out.println("1");
//上传文件夹
boolean uploadFlag = ftp.uploadDirectory("D:\\test02", "/"); //如果是admin/那么传的就是所有文件，如果只是/那么就是传文件夹
System.out.println("uploadFlag : " + uploadFlag);
//下载文件夹
ftp.downLoadDirectory("d:\\tm", "/");
ftp.ftpLogOut();
}
}
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