Java FTP download file

1, the use of official regular jar

Commons-net-1.4.1.jar

Jakarta-oro-2.0.8.jar

Note: Downloading files from Windows Server using FTP is not the same as downloading files from a Linux server

2. download files from Linux server with FTP

System.out.println (NewDate () + "Start entering Ftpdownload timer"); //FTP Server login CredentialsString host=propertiesmanager.getproperty ("Ftphost"); intPort=integer.parseint (Propertiesmanager.getproperty ("FtpPort")); String User=propertiesmanager.getproperty ("Ftpuser"); String Password=propertiesmanager.getproperty ("FTPPassword"); //Get Time field informationSimpleDateFormat sdf1=NewSimpleDateFormat ("YyyyMMdd"); SimpleDateFormat SDF=NewSimpleDateFormat ("Yyyy-mm-dd"); Date Date=NewDate (); String Today1=Sdf1.format (date); String Today=Sdf.format (date); String txtfiledir= "/"; String Txtsavedir= "e:/datacenter/shengzhan/"; //Check if the local disk directory exists TXT file        BooleanFlag =Istxtexit (Today1,txtsavedir); System.out.println (NewDate () + "Determine if the TXT file exists:" +flag); Flagutil.ftpdownloadrunning=true; //txt-speaking download operations and parsing operations are divided into 2 separate operations to eliminate interference between each other.        if(flag==false)//file does not exist for FTP download operation{ftpclient ftp=NULL; Try            {                //data download for FTPftp=Newftpclient ();                   Ftp.connect (host, Port);                Ftp.login (user, password);                                Ftp.setfiletype (Ftpclient.binary_file_type); //setting up a Linux environmentFtpclientconfig conf =NewFtpclientconfig (Ftpclientconfig.syst_unix);                                Ftp.configure (conf); //determine if the connection is successful                intReply =Ftp.getreplycode (); if(!ftpreply.ispositivecompletion (Reply))                    {Ftp.disconnect (); System.out.println ("FTP server refused connection."); return; }                                //set access Passive modeFtp.setremoteverificationenabled (false);                                                Ftp.enterlocalpassivemode (); //Retrieve all files in FTP directory and filter using time string                BooleanDIR =ftp.changeworkingdirectory (Txtfiledir); if(dir) {Ftpfile[]fs=Ftp.listfiles ();  for(Ftpfile f:fs) {if(F.getname (). IndexOf (today1+ ") >0) {System.out.println (NewDate () + "ftpdownload timer download txt Success"); File LocalFile=NewFile (txtsavedir+f.getname ()); OutputStream iOS=NewFileOutputStream (LocalFile);                                Ftp.retrievefile (F.getname (), iOS);                                 Ios.close ();  Break; }                        }                }            }             Catch(Exception e) {e.printstacktrace (); System.out.println (NewDate () + "FTP Download TXT file error"); }            finally            {                if(FTP! =NULL)Try{Ftp.disconnect ();}Catch(IOException IoE) {}}

3. download files from Windows Server using FTP

 Public Static Booleandownfile (String URL,//FTP server hostname            intPort//FTP Server PortString username,//FTP login AccountString Password,//FTP Login PasswordString RemotePath,//relative paths on the FTP serverString FileName,//the file name to downloadString LocalPath//save to Local path after download            ) {            BooleanSuccess =false; FtpClient FTP=Newftpclient (); Try {                intreply;                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);//LoginReply =Ftp.getreplycode (); if(!ftpreply.ispositivecompletion (Reply))                    {Ftp.disconnect (); returnsuccess; } System.out.println ("AAA"); Ftp.changeworkingdirectory (RemotePath);//Transfer to FTP server directoryftpfile[] fs =Ftp.listfiles ();  for(Ftpfile ff:fs) {System.out.println ("BB" +FS); if(Ff.getname (). Equals (FileName)) {System.out.println ("DD"); File LocalFile=NewFile (localpath+ "/" +ff.getname ()); OutputStream is=NewFileOutputStream (LocalFile);                      Ftp.retrievefile (Ff.getname (), is); System.out.println ("CCC" +ff.getname () +fileName);                    Is.close ();                }} ftp.logout (); Success=true; } Catch(IOException e) {e.printstacktrace (); } finally {                if(ftp.isconnected ()) {Try{ftp.disconnect (); } Catch(IOException IoE) {}}} returnsuccess; }

Java FTP download file