Jsch implementing file Upload and download to SFTP server

File server with freesshd, file server configuration will not elaborate.

Directly on the code, the code can be used directly.

　　

Importcom.jcraft.jsch.*;ImportJava.io.InputStream;Importjava.util.Properties;ImportOrg.slf4j.Logger;Importorg.slf4j.LoggerFactory;/** * @authorFC *@versionV1.0 * @Title sftpconnect * @Package Com.jsch * @Descript: TODO () * @date: 2018/8/30 pm 3:50*/ Public classSftpconnect {PrivateString User; PrivateString password; PrivateString host; Private intPort; Privatechannelsftp channelsftp; PrivateSession session; PrivateLogger Logger = Loggerfactory.getlogger (sftpconnect.class); Private FinalString no_such_file = "NO SUCH FILE";  PublicSftpconnect (string user, string password, string host,intPort) {         This. user =user;  This. Password =password;  This. Host =host;  This. Port =Port; }    Privatechannelsftp Connect () {Jsch Jsch=NewJsch (); Try{Session=jsch.getsession (User,host,port); Properties Sshconfig=NewProperties (); Sshconfig.put ("Stricthostkeychecking", "no");            Session.setpassword (password);            Session.setconfig (Sshconfig);            Session.connect (); Channelsftp= (channelsftp) session.openchannel ("Sftp");        Channelsftp.connect (); } Catch(jschexception e) {return NULL; }        returnchannelsftp; }    /*** Disconnect Connection*/    Private voidDisconnect () {channelsftp.disconnect ();    Session.disconnect (); }     Public Booleanuploadfile (String path,string filename, InputStream is) {if(Channelsftp = =NULL) {Logger.debug ("Initialize SFTP connection: Connection address: {}", host);            Connect (); Logger.trace ("SFTP Connection initialization complete: {}", host); }        Try{ValidatePath (path);            Channelsftp.put (Is,filename);        Disconnect (); } Catch(sftpexception e) {logger.error ("File upload failed: \n{}", E); return false; }        return true; }        /*** Verify server folder path, create new * if not present@paramPath*/    Private voidValidatePath (String Path)throwssftpexception {Try{channelsftp.lstat (path);        CHANNELSFTP.CD (path); } Catch(sftpexception e) {if(No_such_file.equals (E.getmessage ())) {Logger.debug ("{} does not exist, create this path", path); String[] Paths= Path.split ("/");  for(String p:paths) {Try{channelsftp.cd (P); } Catch(sftpexception E1) {Channelsftp.mkdir (P);                    CHANNELSFTP.CD (P); }                }            }Else {                Throwe; }        }    }    /*** Download File *@paramPath *@paramfilename *@param: Is *@return     */     PublicInputStream downfile (String path,string filename) {if(Channelsftp = =NULL) {Logger.debug ("Initialize SFTP connection: Connection address: {}", host);            Connect (); Logger.trace ("SFTP Connection initialization complete: {}", host); }        Try{channelsftp.cd (path); InputStream is=channelsftp.get (filename);            Disconnect (); returnis ; } Catch(sftpexception e) {return NULL; }    }}

Jsch implementing file Upload and download to SFTP server