sun.net.ftp.FtpClient 实现简单上传下载
sun.net.ftp.FtpClient 可以帮助我们进行一些简单的ftp客户端功能：下载、上传文件，但如遇到创建目录之类的就无能为力了，我们只好利用第三方源码。
1.文件的上传
System.out.println("开始建立连接");
???FtpClient ftpClient=new FtpClient(ip,Integer.valueOf(sock).intValue());
???ftpClient.login(username,pwd);
???ftpClient.binary();
???System.out.println("成功建立连接开始上传文件");
???for(int i=0;i<filename.length;i++){
????File f=new File(createfilepath+File.separator+filename[i]);
????System.out.println("开始上传文件:"+createfilepath+File.separator+filename[i]);
????if(!f.exists())continue;
????FileInputStream fis=new FileInputStream(f);
?????? TelnetOutputStream tos=ftpClient.put(uppath+File.separator+f.getName());
?????? byte[] bt=new byte[1024];
?????? int len=0;
?????? int lenTotal=0;
?????? while((len=fis.read(bt))!=-1) {
?????????? lenTotal+=len;
?????????? tos.write(bt,0,len);
?????? }
?????? System.out.println("成功上传文件:"+createfilepath+File.separator+filename[i]);
?????? tos.close();
?????? fis.close();
???????? }
???????? ftpClient.closeServer();
2.文件的下载
FtpClient ftpClient = new FtpClient(ip, Integer.valueOf(sock).intValue());
???ftpClient.login(username, pwd);
???BufferedReader reader = new BufferedReader(new InputStreamReader(ftpClient.nameList(downpath)));
???ArrayList<String> nameList = new ArrayList<String>();
???
???String s = "";
???while( (s = reader.readLine()) != null){
????if(s.indexOf(".xls")==-1 && s.indexOf(".dat")==-1)
?????nameList.add(s);
???}
???
???for(String filename : nameList){
????File f = new File(filename);
????if(!f.isDirectory()){
?????File fi = new File(downfilepath+File.separator+filename);
?????RandomAccessFile getFile = new RandomAccessFile(fi, "rw");
?????getFile.seek(0);
?????TelnetInputStream ins = ftpClient.get(downpath+File.separator+filename);
?????DataInputStream dins = new DataInputStream(ins);
?????
?????String ss = "";
?????while((s = dins.readLine()) != null){
??????getFile.writeBytes(ss);
?????}
?????ins.close();
?????dins.close();
????}
???}
???ftpClient.closeServer();
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