Java implementation of multi-threaded breakpoint continuation, upload download

Using Apache's Commons-net-ftp-ftpclient

Import Java.io.file;import java.io.fileoutputstream;import Java.io.ioexception;import Java.io.InputStream;import Java.io.outputstream;import Java.io.printwriter;import Java.io.randomaccessfile;import Org.apache.commons.net.printcommandlistener;import Org.apache.commons.net.ftp.ftp;import Org.apache.commons.net.ftp.ftpclient;import Org.apache.commons.net.ftp.ftpfile;import Org.apache.commons.net.ftp.ftpreply;import org.junit.test;/** *//*** FTP utility class with support for the continuation of breakpoints * @version 0.1 basic breakpoint upload Download * @version 0.2 implementation Upload Download progress report * @version 0.3 implementation of Chinese catalog creation and Chinese file creation, add support for Chinese */public class continuedftp{//enum class Uploadstatus code public enum Uploadstatus {create_directory_fail,//remote server corresponding directory creation failed create_directory_success,//remote server Pathbreaker directory succeeded Upload_new_file_ Success,//upload new file successfully upload_new_file_failed,//upload new file failed file_exits,//file already exists remote_bigger_local,//remote file is larger than local file Upload_ From_break_success,//Breakpoint continued success upload_from_break_failed,//breakpoint continued failure delete_remote_faild; Delete remote file failed}//enum class downloadstatus code public enum Downloadstatus {remote_file_noexist,//remote file does not exist LOCAl_bigger_remote,//local file larger than remote file download_from_break_success,//Breakpoint download file successfully download_from_break_failed,// Breakpoint Download file failed download_new_success,//New download file successfully download_new_failed; New download file failed}public ftpclient ftpclient = new FtpClient ();p rivate String ftpurl,username,pwd,ftpport,file1,file2;public ContinueFTP2 (String _ftpurl,string _username,string _pwd,string _ftpport,string _file1,string _file2) {// Set the commands used in the process to output to the console Ftpurl = _ftpurl;username = _username;pwd = _pwd;ftpport = _ftpport;file1 = _file1;file2 = _file2;this.f Tpclient.addprotocolcommandlistener (New Printcommandlistener (New PrintWriter (System.out))); /** *//*** Connect to FTP server * @param hostname hostname * @param port * @param username user name * @param password Password * @return Connection Successful * @throw S ioexception*/public Boolean connect (String hostname,int port,string username,string password) throws ioexception{ Ftpclient.connect (hostname, port); Ftpclient.setcontrolencoding ("GBK"); if (Ftpreply.ispositivecompletion ( Ftpclient.getreplycode ())) {if (Ftpclient.login (username, passworD) {return true;}} Disconnect (); return false;} /** *//*** Download the file from the FTP server, support the continuation of the breakpoint, upload a percentage report * @param remote file path * @param local file path * @return Upload status * @throws ioexception*/pub Lic downloadstatus Download (String remote,string local) throws ioexception{//set passive mode Ftpclient.enterlocalpassivemode () ;//sets the Ftpclient.setfiletype (FTP) to be transferred in binary mode. Binary_file_type);D ownloadstatus result;//Check if the remote file exists ftpfile[] files = ftpclient.listfiles (New String ( Remote.getbytes ("GBK"), "iso-8859-1"), if (files.length! = 1) {System.out.println ("Remote file does not exist"); return Downloadstatus.remote_file_noexist;} Long lremotesize = Files[0].getsize (); File F = new file (local),//locally exists, a breakpoint is downloaded if (f.exists ()) {Long localsize = F.length ();//Determines whether the local file size is greater than the remote file size if (localsize >= lremotesize) {System.out.println ("local file is larger than remote file, download aborted"); return downloadstatus.local_bigger_remote;} Perform a breakpoint continuation and record the status fileoutputstream out = new FileOutputStream (f,true); Ftpclient.setrestartoffset (localsize); I Nputstream in = Ftpclient.retrievefilestream (New String (Remote.getbytes ("GBK"), "iso-8859-1 ")); byte[] bytes = new Byte[1024];long step = Lremotesize/100;long Process=localsize/step;int c;while ((c = In.read ( bytes))! =-1) {out.write (bytes,0,c); Localsize+=c;long nowprocess = localsize/step;if (nowprocess > process) {process = nowprocess;if (Process% = = 0) System.out.println ("Download Progress:" +process)//todo update file download progress, value stored in the process variable}}in.close (); O Ut.close (); Boolean isdo = Ftpclient.completependingcommand (); if (ISDO) {result = Downloadstatus.download_from_break_ Success;} else {result = downloadstatus.download_from_break_failed;}} else {outputstream out = new FileOutputStream (f); InputStream in= Ftpclient.retrievefilestream (New String ( Remote.getbytes ("GBK"), "iso-8859-1"); byte[] bytes = new Byte[1024];long step = Lremotesize/100;long Process=0;long Localsize = 0l;int C;while ((c = in.read (bytes))! =-1) {out.write (bytes, 0, c); Localsize+=c;long nowprocess = Localsize/ste P;if (nowprocess > process) {process = nowprocess;if (process% = = 0) System.out.println ("Download Progress:" +process);//todo Under Update filesLoad progress, value is stored in the process variable}}in.close (); Out.close (); Boolean upnewstatus = Ftpclient.completependingcommand (); if ( Upnewstatus) {result = downloadstatus.download_new_success;} else {result = downloadstatus.download_new_failed;}} return result;} /** *//*** upload files to the FTP server, support the extension of the breakpoint * @param local file name, absolute path * @param remote file path remotely, using/home/directory1/subdirectory/ File.ext or Http://www.guihua.org/subdirectory/file.ext follow the path designation on Linux, support multi-level directory nesting, support recursive creation of nonexistent directory structure * @return upload results * @ Throws Ioexception*/public Uploadstatus upload (String local,string remote) throws ioexception{// Set the Passivemode transport Ftpclient.enterlocalpassivemode ();//Set the Ftpclient.setfiletype (FTP) to be transmitted in a binary stream mode. Binary_file_type); Ftpclient.setcontrolencoding ("GBK"); Uploadstatus result;//Processing of remote directories string remotefilename = Remote;if (Remote.contains ("/")) {Remotefilename = Remote.substring (Remote.lastindexof ("/") +1);//create server remote directory structure, create failure directly return if (Createdirecroty (remote, ftpclient) = = Uploadstatus.create_directory_fail) {return uploadstatus.create_directory_fail;}} Check if the remote exists file ftpfile[]Files = ftpclient.listfiles (new String (Remotefilename.getbytes ("GBK"), "iso-8859-1")); if (files.length = = 1) {Long Remotesize = Files[0].getsize (); File F = new file (local), Long localsize = F.length (); if (remotesize==localsize) {return uploadstatus.file_exits;} else if (Remotesize > Localsize) {return uploadstatus.remote_bigger_local;} Attempt to move the pointer within the file to achieve a continuation of the breakpoint result = UploadFile (Remotefilename, F, ftpclient, remotesize);//If the breakpoint continuation is unsuccessful, delete the file on the server and re-upload if ( result = = uploadstatus.upload_from_break_failed) {if (!ftpclient.deletefile (Remotefilename)) {return Uploadstatus.delete_remote_faild;} result = UploadFile (Remotefilename, F, ftpclient, 0);}} else {result = UploadFile (Remotefilename, New File (local), ftpclient, 0);} return result;} /** *//*** disconnecting from the remote server * @throws ioexception*/public void disconnect () throws Ioexception{if (Ftpclient.isconnected ()) { Ftpclient.disconnect ();}} /** *//*** to create a remote server directory * @param remote server file absolute path * @param ftpclient ftpclient Object * @return Directory creation succeeded * @throws ioexception*/p Ublic UploadstatuS Createdirecroty (String remote,ftpclient ftpclient) throws ioexception{uploadstatus status = Uploadstatus.create_ directory_success; String directory = remote.substring (0,remote.lastindexof ("/") +1); if (!directory.equalsignorecase ("/") &&! Ftpclient.changeworkingdirectory (New String (Directory.getbytes ("GBK"), "iso-8859-1")) {//If the remote directory does not exist, The remote server directory is created recursively int start=0;int end = 0;if (Directory.startswith ("/")) {start = 1;} Else{start = 0;} End = Directory.indexof ("/", start); while (true) {string subdirectory = new String (remote.substring (start,end). getBytes ("GBK"), "iso-8859-1"), if (!ftpclient.changeworkingdirectory (subdirectory)) {if (Ftpclient.makedirectory ( subdirectory)) {ftpclient.changeworkingdirectory (subdirectory);} else {System.out.println ("Failed to create directory"); return uploadstatus.create_directory_fail;}}  Start = end + 1;end = Directory.indexof ("/", start);//Check that all directories are created if (end<= Start) {break;}}} return status;} /** *//*** upload files to the server, new uploads and breakpoints continue * @param remotefile remote file name, the server working directory has been changed before uploading * @param localfile local file handle, absolute path * @param proc Essstep the processing progress step value that needs to be displayed * @param ftpclient ftpclient Reference * @return * @throws ioexception*/public uploadstatus uploadfile (String Remotefile,file localfile,ftpclient Ftpclient,long remotesize) throws Ioexception{uploadstatus status;//Show progress upload long Step= Localfile.length ()/100;long Process= 0;Long Localreadbytes= 0L;Randomaccessfile RAF= newRandomaccessfile (LocalFile, "R"); OutputStream out= Ftpclient.appendfilestream (NewString (remotefile.getbytes ("GBK"), "iso-8859-1"));//breakpoint Continuation if (Remotesize>0) {Ftpclient.setrestartoffset (remotesize);p rocess = Remotesize/step;raf.seek (remotesize); localreadbytes = RemoteSize ;} byte[] bytes = new Byte[1024];int C;while ((c = raf.read (bytes))! =-1) {out.write (bytes,0,c); Localreadbytes+=c;if ( Localreadbytes/step! = Process) {process = Localreadbytes/step; System.out.println ("Upload progress:" + process),//todo report upload status}}out.flush (); Raf.close (); Out.close (); Boolean result = Ftpclient.completependingcommand (); if (Remotesize > 0) {status = result? UploadStatus.Upload_From_Break_Success:UploadStatus.Upload_From_Break_Failed;} else {status = result? UploadStatus.Upload_New_File_Success:UploadStatus.Upload_New_File_Failed;} return status;}}

View Code

Java implementation of multi-threaded breakpoint continuation, upload download