Apache-commons-net Ftp file, folder upload download and log output

With Apache Commons-net-3.0.1.jar and Log4j-1.2.15.jar, this is a jar bag.

package com.bjut.edu.cn.ftp;      import java.io.bufferedinputstream;   import java.io.bufferedoutputstream;   import java.io.file;   import  java.io.fileinputstream;   import java.io.filenotfoundexception;   import  java.io.fileoutputstream;   import java.io.ioexception;   import  java.util.timezone;   import org.apache.commons.net.ftp.ftpclient;   import  org.apache.commons.net.ftp.ftpclientconfig;   import org.apache.commons.net.ftp.ftpfile;    import org.apache.commons.net.ftp.ftpreply;      import  org.apache.log4j.logger;      public class ftp {        private FTPClient ftpClient;       private string  strIp;       private int intport;       private String user;        private String password;          private  Static logger logger = logger.getlogger (Ftp.class.getName ());          /* *       * ftp Constructors         */       public ftp (String strip, int intport,  string user, string password)  {            this.strIp = strIp;            this.intport = intport;           this.user =  user;           this.password = Password;       &NBsp;    this.ftpclient = new ftpclient ();        }       /**       *  @return   To determine whether to login successfully        * */       public boolean  FTPLogin ()  {           boolean isLogin =  false;           ftpclientconfig ftpclientconfig =  new ftpclientconfig ();            Ftpclientconfig.setservertimezoneid (Timezone.getdefault (). GetID ());            this.ftpclient.setcontrolencoding ("GBK");            this.ftpclient.configure (ftpclientconfig);            try {   &Nbsp;           if  (This