Java利用apache ftp工具实现文件上传下载和删除功能

Java利用apache ftp工具实现文件上传下载和删除功能

利用apache ftp工具实现文件的上传下载和删除，具体如下

1、下载相应的jar包

commons-net-1.4.1.jar

2、实现代码如下：

public class FtpUtils {

//ftp服务器地址

public String hostname = "192.168.1.249";

//ftp服务器端口号默认为21

public Integer port = 21 ;

//ftp登录账号

public String username = "root";

//ftp登录密码

public String password = "123";

public FTPClient ftpClient = null;

/**

* 初始化ftp服务器

*/

public void initFtpClient() {

ftpClient = new FTPClient();

ftpClient.setControlEncoding("utf-8");

try {

System.out.println("connecting...ftp服务器:"+this.hostname+":"+this.port);

ftpClient.connect(hostname, port); //连接ftp服务器

ftpClient.login(username, password); //登录ftp服务器

int replyCode = ftpClient.getReplyCode(); //是否成功登录服务器

if(!FTPReply.isPositiveCompletion(replyCode)){

System.out.println("connect failed...ftp服务器:"+this.hostname+":"+this.port);

}

System.out.println("connect successfu...ftp服务器:"+this.hostname+":"+this.port);

}catch (MalformedURLException e) {

e.printStackTrace();

}catch (IOException e) {

e.printStackTrace();

}

}

/**

* 上传文件

* @param pathname ftp服务保存地址

* @param fileName 上传到ftp的文件名

* @param originfilename 待上传文件的名称（绝对地址） *

* @return

*/

public boolean uploadFile( String pathname, String fileName,String originfilename){

boolean flag = false;

InputStream inputStream = null;

try{

System.out.println("开始上传文件");

inputStream = new FileInputStream(new File(originfilename));

initFtpClient();

ftpClient.setFileType(ftpClient.BINARY_FILE_TYPE);

CreateDirecroty(pathname);

ftpClient.makeDirectory(pathname);

ftpClient.changeWorkingDirectory(pathname);

ftpClient.storeFile(fileName, inputStream);

inputStream.close();

ftpClient.logout();

flag = true;

System.out.println("上传文件成功");

}catch (Exception e) {

System.out.println("上传文件失败");

e.printStackTrace();

}finally{

if(ftpClient.isConnected()){

try{

ftpClient.disconnect();

}catch(IOException e){

e.printStackTrace();

}

}

if(null != inputStream){

try {

inputStream.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

return true;

}

/**

* 上传文件

* @param pathname ftp服务保存地址

* @param fileName 上传到ftp的文件名

* @param inputStream 输入文件流

* @return

*/

public boolean uploadFile( String pathname, String fileName,InputStream inputStream){

boolean flag = false;

try{

System.out.println("开始上传文件");

initFtpClient();

ftpClient.setFileType(ftpClient.BINARY_FILE_TYPE);

CreateDirecroty(pathname);

ftpClient.makeDirectory(pathname);

ftpClient.changeWorkingDirectory(pathname);

ftpClient.storeFile(fileName, inputStream);

inputStream.close();

ftpClient.logout();

flag = true;

System.out.println("上传文件成功");

}catch (Exception e) {

System.out.println("上传文件失败");

e.printStackTrace();

}finally{

if(ftpClient.isConnected()){

try{

ftpClient.disconnect();

}catch(IOException e){

e.printStackTrace();

}

}

if(null != inputStream){

try {

inputStream.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

return true;

}

//改变目录路径

public boolean changeWorkingDirectory(String directory) {

boolean flag = true;

try {

flag = ftpClient.changeWorkingDirectory(directory);

if (flag) {

System.out.println("进入文件夹" + directory + " 成功！");

} else {

System.out.println("进入文件夹" + directory + " 失败！开始创建文件夹");

}

} catch (IOException ioe) {

ioe.printStackTrace();

}

return flag;

}

//创建多层目录文件，如果有ftp服务器已存在该文件，则不创建，如果无，则创建

public boolean CreateDirecroty(String remote) throws IOException {

boolean success = true;

String directory = remote + "/";

// 如果远程目录不存在，则递归创建远程服务器目录

if (!directory.equalsIgnoreCase("/") && !changeWorkingDirectory(new String(directory))) {

int start = 0;

int end = 0;

if (directory.startsWith("/")) {

start = 1;

} else {

start = 0;

}

end = directory.indexOf("/", start);

String path = "";

String paths = "";

while (true) {

String subDirectory = new String(remote.substring(start, end).getBytes("GBK"), "iso-8859-1");

path = path + "/" + subDirectory;

if (!existFile(path)) {

if (makeDirectory(subDirectory)) {

changeWorkingDirectory(subDirectory);

} else {

System.out.println("创建目录[" + subDirectory + "]失败");

changeWorkingDirectory(subDirectory);

}

} else {

changeWorkingDirectory(subDirectory);

}

paths = paths + "/" + subDirectory;

start = end + 1;

end = directory.indexOf("/", start);

// 检查所有目录是否创建完毕

if (end <= start) {

break;

}

}

}

return success;

}

//判断ftp服务器文件是否存在

public boolean existFile(String path) throws IOException {

boolean flag = false;

FTPFile[] ftpFileArr = ftpClient.listFiles(path);

if (ftpFileArr.length > 0) {

flag = true;

}

return flag;

}

//创建目录

public boolean makeDirectory(String dir) {

boolean flag = true;

try {

flag = ftpClient.makeDirectory(dir);

if (flag) {

System.out.println("创建文件夹" + dir + " 成功！");

} else {

System.out.println("创建文件夹" + dir + " 失败！");

}

} catch (Exception e) {

e.printStackTrace();

}

return flag;

}

/** * 下载文件 *

* @param pathname FTP服务器文件目录 *

* @param filename 文件名称 *

* @param localpath 下载后的文件路径 *

* @return */

public boolean downloadFile(String pathname, String filename, String localpath){

boolean flag =http:// false;

OutputStream os=null;

try {

System.out.println("开始下载文件");

initFtpClient();

//切换FTP目录

ftpClient.changeWorkingDirectory(pathname);

FTPFile[] ftpFiles = ftpClient.listFiles();

for(FTPFile file : ftpFiles){

if(filename.equalsIgnoreCase(file.getName())){

File localFile = new File(localpath + "/" + file.getName());

os = new FileOutputStream(localFile);

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

os.close();

}

}

ftpClient.logout();

flag = true;

System.out.println("下载文件成功");

} catch (Exception e) {

System.out.println("下载文件失败");

e.printStackTrace();

} finally{

if(ftpClient.isConnected()){

try{

ftpClient.disconnect();

}catch(IOException e){

e.printStackTrace();

}

}

if(null != os){

try {

os.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

retuhttp://rn flag;

}

/** * 删除文件 *

* @param pathname FTP服务器保存目录 *

* @param filename 要删除的文件名称 *

* @return */

public boolean deleteFile(String pathname, String filename){

boolean flag = false;

try {

System.out.println("开始删除文件");

initFtpClient();

//切换FTP目录

ftpClient.changeWorkingDirectory(pathname);

ftpClient.dele(filename);

ftpClient.logout();

flag = true;

System.out.println("删除文件成功");

} catch (Exception e) {

System.out.println("删除文件失败");

e.printStackTrace();

} finally {

if(ftpClient.isConnected()){

try{

ftpClient.disconnect();

}catch(IOException e){

e.printStackTrace();

}

}

}

return flag;

}

public static void main(String[] args) {

FtpUtils ftp =new FtpUtils();

//ftp.uploadFile("ftpFile/data", "123.docx", "E://123.docx");

//ftp.downloadFile("ftpFile/data", "123.docx", "F://");

ftp.deleteFile("ftpFile/data", "123.docx");

System.out.println("ok");

}

}

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