Java ftpclient implementation File upload download

In Java programs, often need to deal with FTP, such as uploading files to the FTP server, download files, this article briefly describes how to use the Jakarta Commons in the FtpClient (in the commons-net package) implementation of the upload download file.
The jar packages used are:
Commons-net-1.4.1.jar
Jakarta-oro.jar

First, upload files

文件上传源代码 文件上传源代码     /**    * 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    * @param filename 上传到FTP服务器上的文件名    * @param input 输入流    * @return 成功返回true，否则返回false    */   public static boolean uploadFile(     String url, //FTP服务器hostname     int port, //FTP服务器端口     String username, // FTP登录账号     String password, //FTP登录密码     String path, //FTP服务器保存目录     String filename, //上传到FTP服务器上的文件名     InputStream input // 输入流     ) {    boolean success = false ;    FTPClient ftp = new FTPClient();    try {     int reply;     ftp.connect(url, port); //连接FTP服务器      //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      ftp.login(username, password); //登录      reply = ftp.getReplyCode();     if (!FTPReply.isPositiveCompletion(reply)) {      ftp.disconnect();      return success;     }     ftp.changeWorkingDirectory(path);     ftp.storeFile(filename, input);             input.close();     ftp.logout();     success = true ;    } catch (IOException e) {     e.printStackTrace();    } finally {     if (ftp.isConnected()) {      try {       ftp.disconnect();      } catch (IOException ioe) {      }     }    }    return success;   }

The following are the test cases for file uploads:

/**   * 将本地文件上传到FTP服务器上   *   */ public void testUpLoadFromDisk(){   try {    FileInputStream in= new FileInputStream( new File( "D:/test.txt" ));    boolean flag = uploadFile( "127.0.0.1" ,  21 ,  "administrator" ,  "zyuc2011" ,  "test" ,  "test.txt" , in);    System.out.println(flag);   }  catch (FileNotFoundException e) {    e.printStackTrace();   }  } /**   * 在FTP服务器上生成一个文件，并将一个字符串写入到该文件中   *   */ public void testUpLoadFromString(){   try {    String str =  "这是要写入的字符串！" ;    InputStream input =  new ByteArrayInputStream(str.getBytes( "utf-8" ));    boolean flag = uploadFile( "127.0.0.1" ,  21 ,  "administrator" ,  "zyuc2011" ,  "test" ,  "test.txt" , input);     System.out.println(flag);   }  catch (UnsupportedEncodingException e) {    e.printStackTrace();   } }

/**   * 将FTP服务器上文件下载到本地   *   */ public void testDownFile(){   try {    boolean flag = downFile( "127.0.0.1" ,  21 ,  "administrator" ,  "zyuc2011" ,  "test" ,  "test.txt" ,  "D:/" );     System.out.println(flag);   }  catch (Exception e) {    e.printStackTrace();   }   }

/**
* Description: Download files from FTP server
* @Version1.0
* @param URL FTP server hostname
* @param Port FTP Server
* @param username FTP login Account
* @param password FTP login password
* @param the relative path on the RemotePath FTP server
* @param filename to download
* @param localPath saved to local path after download
* @return
*/
public static Boolean Downfile (
String URL,//ftp server hostname
int PORT,//FTP Server Port
String username,//ftp login account
String password,//ftp login password
String remotepath,//ftp relative path on the server
String filename,//the file name to download
String localpath//saved to local path after download
) {
Boolean success = false;
ftpclient ftp = new FtpClient ();
try {
int reply;
Ftp.connect (URL, port);
If you use the default port, you can connect directly to the FTP server using Ftp.connect (URL)
Ftp.login (username, password);//Login
Reply = Ftp.getreplycode ();
if (! Ftpreply.ispositivecompletion (Reply)) {
Ftp.disconnect ();
return success;
}
Ftp.changeworkingdirectory (RemotePath);//Transfer to FTP server directory
ftpfile[] fs = Ftp.listfiles ();
for (Ftpfile Ff:fs) {
if (Ff.getname (). Equals (FileName)) {
File LocalFile = new file (localpath+ "/" +ff.getname ());
OutputStream is = new FileOutputStream (localfile);
Ftp.retrievefile (Ff.getname (), is);
Is.close ();
}
}

Ftp.logout ();
Success = true;
} catch (IOException e) {
E.printstacktrace ();
} finally {
if (ftp.isconnected ()) {
try {
Ftp.disconnect ();
} catch (IOException IoE) {
}
}
}
return success;
}

Java ftpclient implementation File upload download