java實現ftp下載
好像需要一個支持jar包把，把ftp4j的下載地址貼出來
『貳』 java FTP下載文件在代碼中如何實現知道下載完成
(KmConfigkmConfig,StringfileName,StringclientFileName,OutputStreamoutputStream){
try{
StringftpHost=kmConfig.getFtpHost();
intport=kmConfig.getFtpPort();
StringuserName=kmConfig.getFtpUser();
StringpassWord=kmConfig.getFtpPassword();
Stringpath=kmConfig.getFtpPath();
FtpClientftpClient=newFtpClient(ftpHost,port);//ftpHost為FTP伺服器的IP地址，port為FTP伺服器的登陸埠,ftpHost為String型,port為int型。
ftpClient.login(userName,passWord);//userName、passWord分別為FTP伺服器的登陸用戶名和密碼
ftpClient.binary();
ftpClient.cd(path);//path為FTP伺服器上保存上傳文件的路徑。
try{
TelnetInputStreamin=ftpClient.get(fileName);
byte[]bytes=newbyte[1024];
intcnt=0;
while((cnt=in.read(bytes,0,bytes.length))!=-1){
outputStream.write(bytes,0,cnt);
}
//##############################################
//這里文件就已經下載完了，自己理解一下
//#############################################
outputStream.close();
in.close();
}catch(Exceptione){
ftpClient.closeServer();
e.printStackTrace();
}
ftpClient.closeServer();
}catch(Exceptione){
System.out.println("下載文件失敗！請檢查系統FTP設置,並確認FTP服務啟動");
}
}
『叄』 如何在Java程序中實現FTP的上傳下載功能
以下是這三部分的JAVA源程序： (1)顯示FTP伺服器上的文件 void ftpList_actionPerformed(ActionEvent e) {String server=serverEdit.getText();//輸入的FTP伺服器的IP地址 String user=userEdit.getText();//登錄FTP伺服器的用戶名 String password=passwordEdit.getText();//登錄FTP伺服器的用戶名的口令 String path=pathEdit.getText();//FTP伺服器上的路徑 try {FtpClient ftpClient=new FtpClient();//創建FtpClient對象 ftpClient.openServer(server);//連接FTP伺服器 ftpClient.login(user, password);//登錄FTP伺服器 if (path.length()!=0) ftpClient.cd(path); TelnetInputStream is=ftpClient.list(); int c; while ((c=is.read())!=-1) { System.out.print((char) c);} is.close(); ftpClient.closeServer();//退出FTP伺服器 } catch (IOException ex) {;} } (2)從FTP伺服器上下傳一個文件 void getButton_actionPerformed(ActionEvent e) { String server=serverEdit.getText(); String user=userEdit.getText(); String password=passwordEdit.getText(); String path=pathEdit.getText(); String filename=filenameEdit.getText(); try { FtpClient ftpClient=new FtpClient(); ftpClient.openServer(server); ftpClient.login(user, password); if (path.length()!=0) ftpClient.cd(path); ftpClient.binary(); TelnetInputStream is=ftpClient.get(filename); File file_out=new File(filename); FileOutputStream os=new FileOutputStream(file_out); byte[] bytes=new byte[1024]; int c; while ((c=is.read(bytes))!=-1) { os.write(bytes,0,c); } is.close(); os.close(); ftpClient.closeServer(); } catch (IOException ex) {;} } (3)向FTP伺服器上上傳一個文件 void putButton_actionPerformed(ActionEvent e) { String server=serverEdit.getText(); String user=userEdit.getText(); String password=passwordEdit.getText(); String path=pathEdit.getText(); String filename=filenameEdit.getText(); try { FtpClient ftpClient=new FtpClient(); ftpClient.openServer(server); ftpClient.login(user, password); if (path.length()!=0) ftpClient.cd(path); ftpClient.binary(); TelnetOutputStream os=ftpClient.put(filename); File file_in=new File(filename); FileInputStream is=new FileInputStream(file_in); byte[] bytes=new byte[1024]; int c; while ((c=is.read(bytes))!=-1){ os.write(bytes,0,c);} is.close(); os.close(); ftpClient.closeServer(); } catch (IOException ex) {;} } }
『肆』 如何用Java實現FTP伺服器
1.使用的FileZillaServer開源免費軟體，安裝過後建立的本地FTP伺服器。2.使用的apache上下載FTP工具包，引用到工程目錄中。3.IDE，Eclipse，JDK6上傳和下載目錄的實現原理：對每一個層級的目錄進行判斷，是為目錄類型、還是文件類型。如果為目錄類型，採用遞歸調用方法，檢查到最底層的目錄為止結束。如果為文件類型，則調用上傳或者下載方法對文件進行上傳或者下載操作。貼出代碼：（其中有些沒有代碼，可以看看，還是很有用處的）！
『伍』 linux下java實現ftp下載，ftpClient.listFiles();返回的數組長度一直是0
如果你加了ftpClient.enterRemotePassiveMode();還是不行，那麼就可能是你commons-net 的jia包版本太低，你可以試著引入 commons-net-3.3.jar以及以上版本的jar應該就可以了。
『陸』 java怎樣快速的實現從ftp上下載多張圖片
一般採用Apache FTP jar 進行FTP操作 循環下載 或者開啟線程取下載
了解下Apache FTP 或者找個DOME 看下10分鍾就玩會了
『柒』 java 實現ftp上傳下載，windows下和linux下游何區別
packagecom.weixin.util;
importjava.io.File;
importjava.io.FileOutputStream;
importjava.io.IOException;
importjava.io.InputStream;
importjava.io.OutputStream;
importjava.io.PrintWriter;
importjava.io.RandomAccessFile;
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;
importcom.weixin.constant.DownloadStatus;
importcom.weixin.constant.UploadStatus;
/**
*支持斷點續傳的FTP實用類
*@version0.1實現基本斷點上傳下載
*@version0.2實現上傳下載進度匯報
*@version0.3實現中文目錄創建及中文文件創建，添加對於中文的支持
*/
publicclassContinueFTP{
publicFTPClientftpClient=newFTPClient();
publicContinueFTP(){
//設置將過程中使用到的命令輸出到控制台
this.ftpClient.addProtocolCommandListener(newPrintCommandListener(newPrintWriter(System.out)));
}
/**
*連接到FTP伺服器
*@paramhostname主機名
*@paramport埠
*@paramusername用戶名
*@parampassword密碼
*@return是否連接成功
*@throwsIOException
*/
publicbooleanconnect(Stringhostname,intport,Stringusername,Stringpassword)throwsIOException{
ftpClient.connect(hostname,port);
ftpClient.setControlEncoding("GBK");
if(FTPReply.isPositiveCompletion(ftpClient.getReplyCode())){
if(ftpClient.login(username,password)){
returntrue;
}
}
disconnect();
returnfalse;
}
/**
*從FTP伺服器上下載文件,支持斷點續傳，上傳百分比匯報
*@paramremote遠程文件路徑
*@paramlocal本地文件路徑
*@return上傳的狀態
*@throwsIOException
*/
publicDownloadStatusdownload(Stringremote,Stringlocal)throwsIOException{
//設置被動模式
ftpClient.enterLocalPassiveMode();
//設置以二進制方式傳輸
ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
DownloadStatusresult;
//檢查遠程文件是否存在
FTPFile[]files=ftpClient.listFiles(newString(remote.getBytes("GBK"),"iso-8859-1"));
if(files.length!=1){
System.out.println("遠程文件不存在");
returnDownloadStatus.Remote_File_Noexist;
}
longlRemoteSize=files[0].getSize();
Filef=newFile(local);
//本地存在文件，進行斷點下載
if(f.exists()){
longlocalSize=f.length();
//判斷本地文件大小是否大於遠程文件大小
if(localSize>=lRemoteSize){
System.out.println("本地文件大於遠程文件，下載中止");
returnDownloadStatus.Local_Bigger_Remote;
}
//進行斷點續傳，並記錄狀態
FileOutputStreamout=newFileOutputStream(f,true);
ftpClient.setRestartOffset(localSize);
InputStreamin=ftpClient.retrieveFileStream(newString(remote.getBytes("GBK"),"iso-8859-1"));
byte[]bytes=newbyte[1024];
longstep=lRemoteSize/100;
longprocess=localSize/step;
intc;
while((c=in.read(bytes))!=-1){
out.write(bytes,0,c);
localSize+=c;
longnowProcess=localSize/step;
if(nowProcess>process){
process=nowProcess;
if(process%10==0)
System.out.println("下載進度："+process);
//TODO更新文件下載進度,值存放在process變數中
}
}
in.close();
out.close();
booleanisDo=ftpClient.completePendingCommand();
if(isDo){
result=DownloadStatus.Download_From_Break_Success;
}else{
result=DownloadStatus.Download_From_Break_Failed;
}
}else{
OutputStreamout=newFileOutputStream(f);
InputStreamin=ftpClient.retrieveFileStream(newString(remote.getBytes("GBK"),"iso-8859-1"));
byte[]bytes=newbyte[1024];
longstep=lRemoteSize/100;
longprocess=0;
longlocalSize=0L;
intc;
while((c=in.read(bytes))!=-1){
out.write(bytes,0,c);
localSize+=c;
longnowProcess=localSize/step;
if(nowProcess>process){
process=nowProcess;
if(process%10==0)
System.out.println("下載進度："+process);
//TODO更新文件下載進度,值存放在process變數中
}
}
in.close();
out.close();
booleanupNewStatus=ftpClient.completePendingCommand();
if(upNewStatus){
result=DownloadStatus.Download_New_Success;
}else{
result=DownloadStatus.Download_New_Failed;
}
}
returnresult;
}
/**
*上傳文件到FTP伺服器，支持斷點續傳
*@paramlocal本地文件名稱，絕對路徑
*@paramremote遠程文件路徑，使用/home/directory1/subdirectory/file.ext按照Linux上的路徑指定方式，支持多級目錄嵌套，支持遞歸創建不存在的目錄結構
*@return上傳結果
*@throwsIOException
*/
publicUploadStatusupload(Stringlocal,Stringremote)throwsIOException{
//設置PassiveMode傳輸
ftpClient.enterLocalPassiveMode();
//設置以二進制流的方式傳輸
ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
ftpClient.setControlEncoding("GBK");
UploadStatusresult;
//對遠程目錄的處理
StringremoteFileName=remote;
if(remote.contains("/")){
remoteFileName=remote.substring(remote.lastIndexOf("/")+1);
//創建伺服器遠程目錄結構，創建失敗直接返回
if(CreateDirecroty(remote,ftpClient)==UploadStatus.Create_Directory_Fail){
returnUploadStatus.Create_Directory_Fail;
}
}
//檢查遠程是否存在文件
FTPFile[]files=ftpClient.listFiles(newString(remoteFileName.getBytes("GBK"),"iso-8859-1"));
if(files.length==1){
longremoteSize=files[0].getSize();
Filef=newFile(local);
longlocalSize=f.length();
if(remoteSize==localSize){
returnUploadStatus.File_Exits;
}elseif(remoteSize>localSize){
returnUploadStatus.Remote_Bigger_Local;
}
//嘗試移動文件內讀取指針,實現斷點續傳
result=uploadFile(remoteFileName,f,ftpClient,remoteSize);
//如果斷點續傳沒有成功，則刪除伺服器上文件，重新上傳
if(result==UploadStatus.Upload_From_Break_Failed){
if(!ftpClient.deleteFile(remoteFileName)){
returnUploadStatus.Delete_Remote_Faild;
}
result=uploadFile(remoteFileName,f,ftpClient,0);
}
}else{
result=uploadFile(remoteFileName,newFile(local),ftpClient,0);
}
returnresult;
}
/**
*斷開與遠程伺服器的連接
*@throwsIOException
*/
publicvoiddisconnect()throwsIOException{
if(ftpClient.isConnected()){
ftpClient.disconnect();
}
}
/**
*遞歸創建遠程伺服器目錄
*@paramremote遠程伺服器文件絕對路徑
*@paramftpClientFTPClient對象
*@return目錄創建是否成功
*@throwsIOException
*/
(Stringremote,FTPClientftpClient)throwsIOException{
UploadStatusstatus=UploadStatus.Create_Directory_Success;
Stringdirectory=remote.substring(0,remote.lastIndexOf("/")+1);
if(!directory.equalsIgnoreCase("/")&&!ftpClient.changeWorkingDirectory(newString(directory.getBytes("GBK"),"iso-8859-1"))){
//如果遠程目錄不存在，則遞歸創建遠程伺服器目錄
intstart=0;
intend=0;
if(directory.startsWith("/")){
start=1;
}else{
start=0;
}
end=directory.indexOf("/",start);
while(true){
StringsubDirectory=newString(remote.substring(start,end).getBytes("GBK"),"iso-8859-1");
if(!ftpClient.changeWorkingDirectory(subDirectory)){
if(ftpClient.makeDirectory(subDirectory)){
ftpClient.changeWorkingDirectory(subDirectory);
}else{
System.out.println("創建目錄失敗");
returnUploadStatus.Create_Directory_Fail;
}
}
start=end+1;
end=directory.indexOf("/",start);
//檢查所有目錄是否創建完畢
if(end<=start){
break;
}
}
}
returnstatus;
}
/**
*上傳文件到伺服器,新上傳和斷點續傳
*@paramremoteFile遠程文件名，在上傳之前已經將伺服器工作目錄做了改變
*@paramlocalFile本地文件File句柄，絕對路徑
*@paramprocessStep需要顯示的處理進度步進值
*@paramftpClientFTPClient引用
*@return
*@throwsIOException
*/
publicUploadStatusuploadFile(StringremoteFile,FilelocalFile,FTPClientftpClient,longremoteSize)throwsIOException{
UploadStatusstatus;
//顯示進度的上傳
longstep=localFile.length()/100;
longprocess=0;
longlocalreadbytes=0L;
RandomAccessFileraf=newRandomAccessFile(localFile,"r");
OutputStreamout=ftpClient.appendFileStream(newString(remoteFile.getBytes("GBK"),"iso-8859-1"));
//斷點續傳
if(remoteSize>0){
ftpClient.setRestartOffset(remoteSize);
process=remoteSize/step;
raf.seek(remoteSize);
localreadbytes=remoteSize;
}
byte[]bytes=newbyte[1024];
intc;
while((c=raf.read(bytes))!=-1){
out.write(bytes,0,c);
localreadbytes+=c;
if(localreadbytes/step!=process){
process=localreadbytes/step;
System.out.println("上傳進度:"+process);
//TODO匯報上傳狀態
}
}
out.flush();
raf.close();
out.close();
booleanresult=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;
}
returnstatus;
}
publicstaticvoidmain(String[]args){
ContinueFTPmyFtp=newContinueFTP();
try{
System.err.println(myFtp.connect("10.10.6.236",21,"5","jieyan"));
// myFtp.ftpClient.makeDirectory(newString("歌曲".getBytes("GBK"),"iso-8859-1"));
// myFtp.ftpClient.changeWorkingDirectory(newString("歌曲".getBytes("GBK"),"iso-8859-1"));
// myFtp.ftpClient.makeDirectory(newString("愛你等於愛自己".getBytes("GBK"),"iso-8859-1"));
// System.out.println(myFtp.upload("E:\yw.flv","/yw.flv",5));
// System.out.println(myFtp.upload("E:\愛你等於愛自己.mp4","/愛你等於愛自己.mp4"));
//System.out.println(myFtp.download("/愛你等於愛自己.mp4","E:\愛你等於愛自己.mp4"));
myFtp.disconnect();
}catch(IOExceptione){
System.out.println("連接FTP出錯："+e.getMessage());
}
}
}
『捌』 java中怎麼實現ftp伺服器
我知道apache有個commons net包，其中的FTPClient類可以實現客戶端和服務之間的文件傳輸，但是我如果使用這種方式的話，就得將一台伺服器上的文件傳到我本地，再將這個文件傳到另一台伺服器上，感覺這中間多了一步操作；
『玖』 用java實現ftp下載，路徑的問題，很暈
ftpClient.changeWorkingDirectory(」20110814「)，你應該這么寫，如果用/開頭表示是絕對路徑，而 20110814表示是相對路徑，你看下絕對路徑跟相對路徑就明白了