Java Technology Implementation upload download file to FTP server (complete) _java

For more detailed information, please see below:

Using an FTP server is a good choice for applications that use files for interactive data. This article uses Apache Jakarta Commons Net (Commons-net-3.3.jar) to implement an upload/download/delete of files on an FTP server based on FileZilla server servers.

For more detailed configuration procedures for FileZilla server servers, see the FileZilla Server Installation configuration tutorial. Before a friend said, upload large files (more than hundreds of M files) to the FTP server will reproduce the problem can not be renamed, but I test upload 2G file to FileZilla server does not have the problem, friends can be assured to use the code.

Favftputil.java package com.favccxx.favsoft.util;
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;
Import Org.apache.commons.net.ftp.FTPFile;

Import org.apache.commons.net.ftp.FTPReply; public class Favftputil {/** * upload file (available for use by the Action/controller layer) * @param hostname FTP server address * @param port FTP Server port number * @ PARAM username FTP login account * @param password FTP login password * @param pathname FTP Server save directory * @param filename uploaded to the FTP server file name * @par Am InputStream input File stream * @return */public static Boolean UploadFile (string hostname, int port, string username, string p
 Assword, String pathname, String fileName, InputStream InputStream) {Boolean flag = false;
 FtpClient ftpclient = new FtpClient ();
 Ftpclient.setcontrolencoding ("UTF-8");
 try {//Connect FTP server Ftpclient.connect (hostname, port); Login to FTP server Ftpclient.login (username, password);
 Whether to successfully log on to the FTP server int replycode = Ftpclient.getreplycode (); if (!
 Ftpreply.ispositivecompletion (Replycode)) {return flag;
 } ftpclient.setfiletype (Ftpclient.binary_file_type);
 Ftpclient.makedirectory (pathname);
 Ftpclient.changeworkingdirectory (pathname);
 Ftpclient.storefile (FileName, InputStream);
 Inputstream.close ();
 Ftpclient.logout ();
 Flag = true;
 catch (Exception e) {e.printstacktrace ();
 } finally{if (ftpclient.isconnected ()) {try {ftpclient.disconnect ();
 catch (IOException e) {e.printstacktrace ();
 }} return flag; /** * Upload file (can rename file) * @param hostname FTP server address * @param port FTP Server port number * @param username FTP login account * @param pa  ssWOrd FTP Login Password * @param pathname FTP Server save directory * @param filename uploaded to the FTP server file name * @param originfilename the name of the file to be uploaded (absolute address) * @return */public static Boolean uploadfilefromproduction (string hostname, int port, string username, string password, String pathname, string filename, String originfilename) {Boolean flag = FalsE
 try {inputstream InputStream = new FileInputStream (new File (Originfilename)); 
 Flag = UploadFile (hostname, port, username, password, pathname, filename, inputstream);
 catch (Exception e) {e.printstacktrace ();
 return flag; /** * Upload file (can not do file rename operation) * @param hostname FTP server address * @param port FTP Server port number * @param username FTP login Account * @param Password FTP login password * @param pathname FTP Server save directory * @param originfilename the name of the file to be uploaded (absolute address) * @return/public static Boole An uploadfilefromproduction (string hostname, int port, string username, string password, string pathname, String Originfil
 ENAME) {Boolean flag = false;
 try {String fileName = new File (originfilename). GetName ();
 InputStream InputStream = new FileInputStream (new File (Originfilename)); 
 Flag = UploadFile (hostname, port, username, password, pathname, fileName, InputStream);
 catch (Exception e) {e.printstacktrace ();
 return flag;
 /** * Delete file * @param hostname FTP server address * @param port FTP Server port number* @param username FTP login account * @param password FTP login password * @param pathname FTP Server save directory * @param filename name of the file to be deleted * @return  */public static Boolean DeleteFile (string hostname, int port, string username, string password, string pathname, string
 FileName) {Boolean flag = false;
 FtpClient ftpclient = new FtpClient ();
 try {//Connect FTP server Ftpclient.connect (hostname, port);
 Login to FTP server Ftpclient.login (username, password);
 Verify that the FTP server is logged on successfully int replycode = Ftpclient.getreplycode (); if (!
 Ftpreply.ispositivecompletion (Replycode)) {return flag;
 }//Toggle FTP directory Ftpclient.changeworkingdirectory (pathname);
 Ftpclient.dele (filename);
 Ftpclient.logout ();
 Flag = true;
 catch (Exception e) {e.printstacktrace ();
 } finally{if (ftpclient.isconnected ()) {try {ftpclient.logout ();
 The catch (IOException e) {}}} return flag; /** * Download file * @param hostname FTP server address * @param port FTP Server port number * @param username FTP login account * @param password FTP logon secret Code * @param pathname FTP Server file directory * @param filename File name * @param localpath Download file path * @return/public static Boolean downloadFile (String hostname, int port,
 String Username, string password, string pathname, string filename, String localpath) {Boolean flag = false;
 FtpClient ftpclient = new FtpClient ();
 try {//Connect FTP server Ftpclient.connect (hostname, port);
 Login to FTP server Ftpclient.login (username, password);
 Verify that the FTP server is logged on successfully int replycode = Ftpclient.getreplycode (); if (!
 Ftpreply.ispositivecompletion (Replycode)) {return flag;
 }//Toggle FTP directory Ftpclient.changeworkingdirectory (pathname);
 ftpfile[] Ftpfiles = Ftpclient.listfiles ();  for (Ftpfile file:ftpfiles) {if (Filename.equalsignorecase (File.getname ())) {File LocalFile = new file (LocalPath + "/" +
 File.getname ());
 OutputStream OS = new FileOutputStream (localfile);
 Ftpclient.retrievefile (File.getname (), OS);
 Os.close ();
 } ftpclient.logout ();
 Flag = true;
 catch (Exception e) {e.printstacktrace (); } finally{if (ftpclient.isconnected ()) {try {ftpcliEnt.logout ();
 The catch (IOException e) {}}} return flag;

}} Favftputiltest.java package com.favccxx.favsoft.util;

Import Junit.framework.TestCase;
 public class Favftptest extends TestCase {public void Testfavftputil () {String hostname = "127.0.0.1";
 int port = 21;
 String username = "Business";
 String Password = "Business"; 
 String pathname = "Business/ebook"; 
 String filename = "Big.rar";
 String originfilename = "C:\\users\\downloads\\downloads.rar";
Favftputil.uploadfilefromproduction (hostname, port, username, password, pathname, filename, originfilename);
 
String localpath = "d:/";
 Favftputil.downloadfile (hostname, port, username, password, pathname, filename, localpath);
 }

}

Above is the Java through FTP upload file to download the complete code, I hope to help.