Use Apache FTP client to implement FTP clients--------support breakpoints and Chinese files.

can refer to: http://blog.csdn.net/xiaozhang0731/article/details/5669151

The main use of the net package in Apache to achieve. URL http://commons.apache.org/net/. Download the specific package and API documentation please reader network.

A breakpoint upload sets the starting position of the transmission during the upload process. and set the binary transmission. Java codePackageApache.net.test;ImportJava.io.File;ImportJava.io.FileInputStream;ImportJava.io.FileOutputStream;ImportJava.io.IOException;ImportJava.io.InputStream;ImportJava.io.OutputStream;ImportJava.io.PrintWriter;ImportOrg.apache.commons.net.PrintCommandListener;ImportOrg.apache.commons.net.ftp.FTP;ImportOrg.apache.commons.net.ftp.FTPClient;ImportOrg.apache.commons.net.ftp.FTPFile;Importorg.apache.commons.net.ftp.FTPReply; Publicclasscontinueftp {PrivateFtpClient ftpclient =NewFtpClient (); PublicContinueftp () {//set to output the command used in the procedure to the console This. Ftpclient.addprotocolcommandlistener (NewPrintcommandlistener (NewPrintWriter (System.out)));        /** * Connect to FTP server * @param hostname host name * @param port * @param username username * @param password Password * @return is connected successfully * @throws IOException * * PublicBooleanConnect (String hostname,intport,string username,string Password)throwsioexception{Ftpclient.connect (hostname, port);if(Ftpreply.ispositivecompletion (Ftpclient.getreplycode ())) {if(Ftpclient.login (username, password)) { returntrue; } disconnect (); returnfalse; /** * Download files from FTP server * @param remote file path * @param local file path * @return Work * @throws IOException * * PublicBooleanDownload (String remote,string local)throwsioexception{Ftpclient.enterlocalpassivemode (); Ftpclient.setfiletype (Ftp.binary_file_type);BooleanResult File f =NewFile (local); ftpfile[] files = ftpclient.listfiles (remote);if(Files.length!= 1) {System.out.println ("Remote file is not unique"); return false; }LongLremotesize = Files[0].getsize ();if(F.exists ()) {OutputStream out =NewFileOutputStream (F,true); SYSTEM.OUT.PRINTLN ("Local File size is:" +f.length ());if(F.length () >= lremotesize) {System.out.println ("Local file size is larger than remote file size, download aborted"); returnfalse;                } ftpclient.setrestartoffset (F.length ());                result = Ftpclient.retrievefile (remote, out);            Out.close (); }Else{OutputStream out =NewFileOutputStream (f);                result = Ftpclient.retrievefile (remote, out);            Out.close (); } returnResult /** * Upload files to FTP server, support breakpoint continued * @param local file name, absolute path * @param remote file path, using/home/d        Irectory1/subdirectory/file.ext in accordance with the path specified on Linux, support multilevel directory nesting, support recursively create nonexistent directory structure * @return upload results * @throws IOException */ PublicUploadstatus Upload (String local,string remote)throwsioexception{//Set Passivemode transmission Ftpclient.enterlocalpassivemode ();            A binary stream is set to transmit Ftpclient.setfiletype (ftp.binary_file_type);            Uploadstatus result; Processing of remote directories String remotefilename = remote;if(Remote.contains ("/"))                {remotefilename = remote.substring (Remote.lastindexof ("/") +1); String directory = remote.substring (0,remote.lastindexof ("/") +1);if(!directory.equalsignorecase ("/") &&!ftpclient.changeworkingdirectory (directory)) {//If the remote directory does not exist, then recursively creates the remote server directoryintstart=0;intend = 0;if(Directory.startswith ("/"))                    {start = 1; }Else{start = 0; End = Directory.indexof ("/", start); while(true) {String subdirectory = remote.substring (start,end);if(!ftpclient.changeworkingdirectory (subdirectory)) {if(Ftpclient.makedirectory (subdirectory))                            {ftpclient.changeworkingdirectory (subdirectory); }Else{System.out.println ("Create directory Failed"); return UploadStatus.Create_Directory_Fail;                             }                         }                                                  start = end + 1;                         end = directory.indexof ("/", start);                                                 //Check that all directories are created                          if(End <= start) { Break; Check to see if there is a remote file ftpfile[] files = Ftpc Lient.listfiles (Remotefilename);if(files.length = 1) {LongRemotesize = Files[0].getsize (); File f =NewFile (local);LongLocalsize = F.length ();if(remotesize==localsize) { returnUploadstatus.file_exits; }Elseif(Remotesize > Localsize) { returnuploadstatus.remote_bigger_local; //Attempt to move the read pointer within the file to implement the breakpoint InputStream is =NewFileInputStream (f);if(Is.skip (remotesize) ==remotesize) {Ftpclient.setrestartoffset (remotesize);if(Ftpclient.storefile (remote, is)) { return UploadStatus.Upload_From_Break_Success;                    }                }                                  //If the breakpoint continues to fail, delete the file on the server, upload the    again