Uploading and downloading files to FTP in Java

Source: Internet
Author: User

A recent project has a lot to do with FTP, often need to upload to FTP, download files, now summarize public methods.


/*** File Upload * *@paramIP * Host *@paramPort * Ports *@paramuserName * User name *@paramPassWord * Password *@paramLocalPath * Upload files on Local disk path *@paramFileName * File name *@paramremotepath * File to upload the path to the FTP server *@throwsException*/     Public StaticBoolean fileftpupload (String IP,intport, String userName, String PassWord, String LocalPath, String fileName, String remotepath) /c0>throwsException {ftpclient ftp=NewFtpClient ();//Creating Client ObjectsInputStream local =NULL; BooleanFlag =false; Try{checkisexsitfile (LocalPath, fileName);//determine if the file is in the local path or notSocketAddress address =Newinetsocketaddress (IP, port); Ftp.connect (IP, port);//ConnectionFtp.login (UserName, PassWord);//LoginLog.info ("FTP server connection, login successful, address:" +address); //Check that the upload path exists if there is no return false            BooleanFlag1 =ftp.changeworkingdirectory (RemotePath); if(!Flag1) {                //Create an uploaded path this method can only create a single level directory, where if/home/ftpuser exists you can create an image//ftp.makedirectory (path);                Throw NewException ("The file directory is not specified on the FTP server, please create first:" +RemotePath); }            //Specify the upload pathftp.changeworkingdirectory (RemotePath); //Specifies the type of file to upload the binary fileFtp.setfiletype (Ftp.binary_file_type); //Read local fileFile File =NewFile (localpath + "\ \" +fileName); Local=Newfileinputstream (file); //The first argument is a file nameFtp.storefile (File.getname (), local); Log.info ("Upload succeeded"); Flag=true; } Catch(SocketException e) {log.info ("Upload failed" +e); Flag=false;        E.printstacktrace (); } Catch(IOException e) {e.printstacktrace (); } finally {            Try {                //Close File StreamLocal.close (); //Exitftp.logout (); //Disconnect ConnectionFtp.disconnect (); } Catch(IOException e) {e.printstacktrace (); }        }        returnFlag; }

Before uploading a file, you need to determine if there are any files specified below the disk, and the method is as follows:

/** * Determine if file path has no specified file *  * @param filePath *            generated file name * @param filename *            file name * @return whether to create a successful, success returns True */public static void Checkisexsitfile (String filePath, String fileName) {file Dirfile = new File (filePath);//Folder object try {file[] File s = dirfile.listfiles (); Boolean bl = false;for (File file1:files) {if (Filename.equals (File1.getname ())) {bl = True;break;}} If the file in the folder does not exist, the error if (!BL) {throw new Exception ("File path does not specify the upload file");}} catch (Exception e) {e.printstacktrace ();}}

Note that you must first switch to the current directory before uploading, that is, this line

Specify the upload path ftp.changeworkingdirectory (remotepath);

You also need to specify the type of upload file

Specifies the type of upload file binary file Ftp.setfiletype (ftp.binary_file_type);


/*** FTP Download file * *@paramIP *@paramPort *@paramUserName *@paramPassWord *@paramLocalPath *@paramRemotePath *@paramfilecontainsname * file contains name *@return     * @throwsException*/     Public StaticString Fileftpdown (String IP,intport, String userName, String PassWord, String LocalPath, String RemotePath, String Filecontain SName)throwsException {ftpclient ftpclient=NewFtpClient ();//Creating Client ObjectsString fileName = ""; SocketAddress Address=Newinetsocketaddress (IP, port); Ftpclient.connect (IP, port);//Connection        BooleanLogin = Ftpclient.login (UserName, PassWord);//Login        if(login) {Try{log.info ("FTP server connection, login successful, address is:" +address); Ftpclient.enterlocalpassivemode ();//open a port to transfer dataftpfile[] fs = Ftpclient.listfiles (RemotePath);//fs for all file collections under RemoteFile                 for(Ftpfile ff:fs) {String F=NewString (Ff.getname (). GetBytes ("Iso-8859-1"),                            "Utf-8"); if(F.contains (Filecontainsname)) {//use contains when file name is indeterminateFile LocalFile =NewFile (LocalPath + "\ \" + f);//an object was created on a locally specified pathOutputStream is =NewFileOutputStream (LocalFile); Ftpclient.changeworkingdirectory (RemotePath);//set the path where the download file is relative to the remote FTP root directoryFtpclient.setfiletype (Ftp.binary_file_type);//set the transport type before you begin downloading filesFtpclient.retrievefile (Ff.getname (), is);                        Is.close (); FileName=F; }                     Break; }            } Catch(IOException e) {e.printstacktrace (); } finally {                if(ftpclient.isconnected ()) {Try{ftpclient.disconnect (); } Catch(IOException IoE) {}}} } Else{log.info ("FTP Server connection, Login failed"); }        returnFileName; }



Uploading and downloading files to FTP in Java

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