Java solution for uploading downloaded files via FTP server

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

For detailed configuration procedures for FileZilla server servers, see the FileZilla Server Installation Configuration tutorial for details. Before a friend said, upload large files (more than hundreds of m of files) to the FTP server will reproduce the problem can not be renamed, but I personally test upload 2G files to FileZilla server does not have this problem, friends can rest assured that 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 Action/controller layer)  *  @param  hostname ftp server address  *  @param  portftp Server port number  *  @param  usernameftp sign-in account  *  @param   PASSWORDFTP login Password  *  @param  pathnameftp Server save directory  *  @param  filename file name after uploading to the FTP server  *  @param  inputStream  input file stream  *  @return  */public static boolean  uploadfile (string hostname, int port, string username, string  Password, 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 FTP server Ftpclient.login (Username, password);// Whether the FTP server is successfully logged on Int replycode = ftpclient.getreplycode (); 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   Portftp Server port number  *  @param &nbSP;USERNAMEFTP login account  *  @param  passwordftp login password  *  save directory for @param  pathnameftp server  *   @param  filename file name after uploading to the FTP server  *  @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;} /** *  Uploading files (no renaming of files)  *  @param  hostname ftp server address  *  @param   Portftp Server port number  *  @param  usernameftp login account  * @param  passwordftp Login Password  *  @param  pathnameftp Server save directory  *  @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 originfilename) {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  portftp Server port number  *  @param  usernameftp login account  *  @param  passwordftp login Password  * @pAram pathnameftp Server Save directory  *  @param  filename file name to delete  *  @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 the FTP server Ftpclient.connect (hostname,  port);//Login FTP server Ftpclient.login (Username, password);//Verify the FTP server is successfully logged in int replycode =  Ftpclient.getreplycode (); if (! Ftpreply.ispositivecompletion (Replycode)) {Return flag;} Switch FTP directory ftpclient.changeworkingdirectory (pathname); Ftpclient.dele (filename); ftpclient.logout (); flag =  true;}  catch  (exception e)  {e.printstacktrace ();}  finally{if (ftpclient.isconnected ()) {try {ftpclient.logout ();}  catch  (Ioexception e)  {}}}return flag;} /** *  download files  *  @param  hOstname ftp server address  *  @param  portftp Server port number  *  @param  usernameftp login account  *   @param  passwordftp login password  *  @param  pathnameftp server file directory  *  @param   FileName File name  *  @param  localpath  file path after download  *  @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 the FTP server Ftpclient.connect (hostname,  port);//Login FTP server Ftpclient.login (Username, password);//Verify the FTP server is successfully logged in int replycode =  Ftpclient.getreplycode (); if (! Ftpreply.ispositivecompletion (Replycode)) {Return flag;} Switch 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 ();}  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);}}

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Java solution for uploading downloaded files via FTP server