Java 利用FTP上传，下载文件，遍历文件目录

Java实现FTP上传下载文件的工具包有很多，这里我采用Java自带的API，实现FTP上传下载文件。另外JDK1.7以前的版本与其之后版本的API有了较大的改变了。

例如：

JDK1.7之前	JDK1.7
ftpClient = new FtpClinet()	ftpClient = FtpClient.create(ip)
ftpclient.login(user,password)	ftpclient.login(user,null,password)
ftpclient.binary()	ftpClient.setBinaryType();

一. 连接FTP服务器

   1: public class FTPUtil {

   2:     //FTP服务器IP地址

   3:     public final static String FTP_HOST = "10.103.240.255";

   4:     

   5:     //FTP服务器端口

   6:     public final static int FTP_PORT = 21;

   7:     

   8:     //FTP服务器用户名

   9:     public final static String FTP_USER = "bloodHunter";

  10:     

  11:     //密码

  12:     public final static String FTP_PASSWORD = "wbljy";

  13:     

  14:     

  15:     public static FtpClient getConnect()

  16:     {

  17:         try {

  18:             FtpClient ftpClient = FtpClient.create(FTP_HOST);

  19:             ftpClient.login(FTP_USER, FTP_PASSWORD.toCharArray());

  20:             return ftpClient;

  21:         } catch (FtpProtocolException e) {

  22:             // TODO Auto-generated catch block

  23:             e.printStackTrace();

  24:             System.out.println("Connect to FTP Server fail!");

  25:             return null;

  26:         } catch (IOException e) {

  27:             // TODO Auto-generated catch block

  28:             e.printStackTrace();

  29:             System.out.println("Connect to FTP Server fail!");

  30:             return null;

  31:         }

  32:         

  33:     }

  34: }

二. 上传文件

   1: /*

   2:      * ftp file upload

   3:      * @param path 上传文件的路径

   4:      * @param fileName 上传文件名称

   5:      * @return 上传成功返回true,否则返回false

   6:      * */

   7:     

   8:     public static boolean FtpUpload(String path,String fileName)

   9:     {

  10:         TelnetOutputStream os = null;

  11:         FileInputStream is = null;

  12:         FtpClient ftpClient = getConnect();

  13:         try {

  14:             ftpClient.setBinaryType();

  15:             os = (TelnetOutputStream) ftpClient.putFileStream(fileName, true);

  16:             is = new FileInputStream(new File(path));

  17:             byte[] buffer = new byte[1024];

  18:             int c;

  19:             while((c = is.read(buffer)) != -1)

  20:             {

  21:                 os.write(buffer,0,c);

  22:             }

  23:             System.out.println("Upload Success!");

  24:             return true;

  25:         } catch (Exception e) {

  26:             // TODO: handle exception

  27:             e.printStackTrace();

  28:             System.out.println("Upload fail!");

  29:             return false;

  30:         }finally{

  31:             try {

  32:                 ftpClient.close();

  33:                 is.close();

  34:                 os.close();

  35:             } catch (IOException e) {

  36:                 // TODO Auto-generated catch block

  37:                 e.printStackTrace();

  38:             }

  39:         }

  40:     }

三. 下载文件

   1: /*

   2:      * ftp file download

   3:      * @param path 下载文件的保存路径

   4:      * @param fileName 下载文件名称

   5:      * @return 下载成功返回true,否则返回false

   6:      * */

   7:     public static boolean FtpDownload(String path,String fileName)

   8:     {

   9:         FileInputStream is = null;

  10:         FileOutputStream os = null;

  11:         FtpClient ftpClient = getConnect();

  12:         try {

  13:             is =  (FileInputStream) ftpClient.getFileStream(fileName);

  14:             os = new FileOutputStream(new File(path));

  15:             byte[] buffer = new byte[1024];

  16:             int c;

  17:             while((c = is.read(buffer)) != -1)

  18:             {

  19:                 os.write(buffer,0,c);

  20:             }

  21:             System.out.println("Download Success!");

  22:             return true;

  23:         } catch (FtpProtocolException e) {

  24:             // TODO Auto-generated catch block

  25:             e.printStackTrace();

  26:             System.out.println("Download fail!");

  27:             return false;

  28:         } catch (IOException e) {

  29:             // TODO Auto-generated catch block

  30:             e.printStackTrace();

  31:             System.out.println("Download fail");

  32:             return false;

  33:         }catch (Exception e) {

  34:             // TODO: handle exception

  35:             e.printStackTrace();

  36:             return false;

  37:         }

  38:         finally{

  39:             try {

  40:                 is.close();

  41:                 os.close();

  42:                 ftpClient.close();

  43:             } catch (IOException e) {

  44:                 // TODO Auto-generated catch block

  45:                 e.printStackTrace();

  46:             }

  47:         }

  48:     }

四. 遍历FTP目录文件

   1: /*

   2:      * FTP getFileList

   3:      * @param filenames       保存遍历的文件名

   4:      * @param path    遍历目录的路径

   5:      * */

   6:     public static void getFtpFileList(List<String> filenames,String path){

   7:         //DataInputStream ds = null;

   8:         BufferedReader ds = null;

   9:         FtpClient ftpClient = getConnect();

  10:         try {

  11:             ds = new BufferedReader(new InputStreamReader(ftpClient.nameList(path),"ISO-8859-1"));

  12:             String line = "";

  13:             while((line = ds.readLine())!=null){

  14:                 line = new String(line.getBytes("ISO-8859-1"),"GBK");

  15:                 String name[] = line.split("/");

  16:                 filenames.add(name[name.length - 1]);

  17:             }

  18:         } catch (FtpProtocolException e) {

  19:             // TODO Auto-generated catch block

  20:             e.printStackTrace();

  21:         } catch (IOException e) {

  22:             // TODO Auto-generated catch block

  23:             e.printStackTrace();

  24:         }finally{

  25:             try {

  26:                 ds.close();

  27:                 ftpClient.close();

  28:             } catch (IOException e) {

  29:                 // TODO Auto-generated catch block

  30:                 e.printStackTrace();

  31:             }

  32:         }

  33:     }