//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<fs.length;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