//文件上传

public static boolean uploadToFTP(String url,int port,String username,String password,String path,String filename,InputStream input)

{

boolean success=false;

FTPClient ftp=new FTPClient();//org.apache.commons.net.ftp

try{

if(port>-1)

{

ftp.connect(url,port);

}else{

ftp.connect(url);//ftp默认的端口是21

}

//很多人写的是用ftp.getReplyCode()给获取连接的返回值,但是这样会导致storeFileStream返回null

if(ftp.login(username,password))

{

ftp.enterLocalActiveMode();

ftp.setFileType(FTPClient.BINARY_FILE_TYPE);

//创建目录,如果存在会返回失败

ftp.makeDirectory(path);

//切换目录

ftp.changeWorkingDirectory(path);

//上传文件

//FTP协议规定文件编码格式为ISO-8859-1

filename=new String(filename.getBytes("GBK"),"ISO-8859-1");

OutputStream out=ftp.storeFileStream(filename);

byte[]byteArray=new byte[4096];

int read=0;

while((read=input.read(byteArray))!=-1)

{

out.write(byteArray,0,read);

}

out.close();

ftp.logout();

sucess=true;

}

}

catch(Exception e)

{

}

finally{

if(ftp.isConnected())

{

ftp.disConnecct();

}

}

}

//文件下载

public static boolean downloadFromFTP(String url,int port,String username,String password,String path,String localpath)

{

boolean success=false;

FTPClient ftp=new FTPClient();//org.apache.commons.net.ftp

try{

int reply;

if(port>-1)

{

ftp.connect(url,port);

}else{

ftp.connect(url);//ftp默认的端口是21

}

//很多人写的是用ftp.getReplyCode()给获取连接的返回值,但是这样会导致storeFileStream返回null

ftp.login(username,password)

ftp.enterLocalActiveMode();

ftp.setFileType(FTPClient.BINARY_FILE_TYPE);

reply=ftp.getReplyCode();

if(!FTPReply.isPositionCompletion(reply))

{

ftp.disconnect();

return success;s

}

//切换目录 此处可以判断,切换失败就说明ftp上面没有这个路径

ftp.changeWorkingDirectory(path);

//上传文件

FTPFile[]fs=ftp.listFiles();

OutputStream out=null;

InputStream in=null;

for(int i=0;i

{

FTPFile ff=fs[i];

String outFileName=ff.getName();

//创建本地的文件时候要把编码格式转回来

String localFileName=new String(ff.getName().getBytes("ISO-8859-"),"GBK");

File localFile=new File(localpath+lcoalFileName);

out=new FileOutputStream(localFile);

in=ftp.retrieveFileStream(outFileName);

byte[]byteArray=new byte[4096];

int read=0;

while((read=in.read(byteArray))!=-1)

{

out.write(byteArray,0,read);

}

//这句很重要 要多次操作这个ftp的流的通道,要等他的每次命令完成

ftp.completePendingCommand();

out.flush();

out.close();

ftp.logout();

sucess=true;

}

catch(Exception e)

{

}

finally{

if(ftp.isConnected())

{

ftp.disConnecct();

}

}

}

上面代码都在博客园编辑器手敲的可能会有些错误,上面两种方式速度都很块 比上传用storeFile 下载用retrieveFile这种方法快很多