Java Client calls FTP upload download file

1:java client uploads, downloads files.

 Packagecom.li.utils;ImportJava.io.File;ImportJava.io.FileInputStream;Importjava.io.FileNotFoundException;ImportJava.io.FileOutputStream;Importjava.io.IOException;ImportJava.io.InputStream;ImportJava.io.OutputStream;ImportOrg.apache.commons.net.ftp.FTP;Importorg.apache.commons.net.ftp.FTPClient;ImportOrg.apache.commons.net.ftp.FTPFile;Importorg.apache.commons.net.ftp.FTPReply;/*** FTP upload Download Tool class * <p>Title:FtpUtil</p> * <p>description: </p> * <p>company:www.itcast.c Om</p> *@authorinto Yunlong * @date July 29, 2015 afternoon 8:11:51 *@version1.0*/ Public classFtputil {/*** Description: Uploading files to FTP server *@paramHost FTP server hostname *@paramPort FTP Server ports *@paramUsername FTP login Account *@paramPassword FTP login password *@parambasepath FTP Server base directory *@paramFilePath FTP Server file storage path. For example, the date of storage:/2015/01/01. The path to the file is Basepath+filepath *@paramfilename uploaded to the FTP server *@paramInput Stream *@returnSuccess returns True, otherwise false*/       Public Static BooleanUploadFile (String host,intport, string Username, string password, string basepath, String filePath, string filename, InputStream INP UT) {Booleanresult =false; FtpClient FTP=Newftpclient (); Try {            intreply; Ftp.connect (host, port);//connecting to an FTP server//If you use the default port, you can connect directly to the FTP server using Ftp.connect (host)Ftp.login (username, password);//LoginReply =Ftp.getreplycode (); if(!ftpreply.ispositivecompletion (Reply))                {Ftp.disconnect (); returnresult;  } ftp.enterlocalpassivemode (); //set FTP to passive mode. Otherwise it will not succeed.            Active mode because the client firewall blocks server 20 ports. //switch to upload directory            if(!ftp.changeworkingdirectory (basepath+FilePath)) {                //Create directory If directory does not existstring[] dirs = Filepath.split ("/"); String TempPath=BasePath;  for(String dir:dirs) {if(NULL= = Dir | | "". Equals (dir))Continue; TempPath+= "/" +dir; if(!ftp.changeworkingdirectory (TempPath)) {                        if(!ftp.makedirectory (TempPath)) {                            returnresult; } Else{ftp.changeworkingdirectory (TempPath); }                    }                }            }            //set the type of upload file to binary typeFtp.setfiletype (Ftp.binary_file_type); //Uploading Files            if(!ftp.storefile (filename, input)) {                returnresult;            } input.close ();            Ftp.logout (); Result=true; } Catch(IOException e) {e.printstacktrace (); } finally {            if(ftp.isconnected ()) {Try{ftp.disconnect (); } Catch(IOException IoE) {}}} returnresult; }        /*** Description: Download files from FTP server *@paramHost FTP server hostname *@paramPort FTP Server ports *@paramUsername FTP login Account *@paramPassword FTP login password *@paramRemotePath The relative path on the FTP server *@paramfilename to download *@paramLocalPath saved to local path after download *@return      */       Public Static BooleanDownloadFile (String host,intport, string Username, string password, string remotepath, String fileName, String localPath) {        Booleanresult =false; FtpClient FTP=Newftpclient (); Try {            intreply;            Ftp.connect (host, Port); //If you use the default port, you can connect directly to the FTP server using Ftp.connect (host)Ftp.login (username, password);//LoginReply =Ftp.getreplycode (); if(!ftpreply.ispositivecompletion (Reply))                {Ftp.disconnect (); returnresult; } ftp.changeworkingdirectory (RemotePath);//Transfer to FTP server directoryftpfile[] fs =Ftp.listfiles ();  for(Ftpfile ff:fs) {if(Ff.getname (). Equals (FileName)) {File LocalFile=NewFile (LocalPath + "/" +ff.getname ()); OutputStream is=NewFileOutputStream (LocalFile);                    Ftp.retrievefile (Ff.getname (), is);                Is.close ();            }} ftp.logout (); Result=true; } Catch(IOException e) {e.printstacktrace (); } finally {            if(ftp.isconnected ()) {Try{ftp.disconnect (); } Catch(IOException IoE) {}}} returnresult; }         Public Static voidMain (string[] args) {Try{FileInputStream in=NewFileInputStream (NewFile ("D:\\data.txt")); BooleanFlag = UploadFile ("192.168.100.91", +, "Liyafei", "1367356", "/home/liyafei/myfile", "/file", "Data.txt", in);          SYSTEM.OUT.PRINTLN (flag); } Catch(FileNotFoundException e) {e.printstacktrace (); }      }}

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FTP active mode and passive mode: https://www.cnblogs.com/ajianbeyourself/p/7655464.html

Java Client calls FTP upload download file