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

public class FTPUtil {
    //FTP服务器IP地址
    public final static String FTP_HOST = "10.103.240.255";

    //FTP服务器端口
    public final static int FTP_PORT = 21;

    //FTP服务器用户名
    public final static String FTP_USER = "bloodHunter";

    //密码
    public final static String FTP_PASSWORD = "wbljy";


    public static FtpClient getConnect()
    {
        try {
            FtpClient ftpClient = FtpClient.create(FTP_HOST);
            ftpClient.login(FTP_USER, FTP_PASSWORD.toCharArray());
            return ftpClient;
        } catch (FtpProtocolException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            System.out.println("Connect to FTP Server fail!");
            return null;
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            System.out.println("Connect to FTP Server fail!");
            return null;
        }

    }
}

二. 上传文件

/*
     * ftp file upload
     * @param path 上传文件的路径
     * @param fileName 上传文件名称
     * @return 上传成功返回true,否则返回false
     * */

    public static boolean FtpUpload(String path,String fileName)
    {
        TelnetOutputStream os = null;
        FileInputStream is = null;
        FtpClient ftpClient = getConnect();
        try {
            ftpClient.setBinaryType();
            os = (TelnetOutputStream) ftpClient.putFileStream(fileName, true);
            is = new FileInputStream(new File(path));
            byte[] buffer = new byte[1024];
            int c;
            while((c = is.read(buffer)) != -1)
            {
                os.write(buffer,0,c);
            }
            System.out.println("Upload Success!");
            return true;
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
            System.out.println("Upload fail!");
            return false;
        }finally{
            try {
                ftpClient.close();
                is.close();
                os.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

三. 下载文件

/*
     * ftp file download
     * @param path 下载文件的保存路径
     * @param fileName 下载文件名称
     * @return 下载成功返回true,否则返回false
     * */
    public static boolean FtpDownload(String path,String fileName)
    {
        FileInputStream is = null;
        FileOutputStream os = null;
        FtpClient ftpClient = getConnect();
        try {
            is =  (FileInputStream) ftpClient.getFileStream(fileName);
            os = new FileOutputStream(new File(path));
            byte[] buffer = new byte[1024];
            int c;
            while((c = is.read(buffer)) != -1)
            {
                os.write(buffer,0,c);
            }
            System.out.println("Download Success!");
            return true;
        } catch (FtpProtocolException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            System.out.println("Download fail!");
            return false;
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            System.out.println("Download fail");
            return false;
        }catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
            return false;
        }
        finally{
            try {
                is.close();
                os.close();
                ftpClient.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

四. 遍历FTP目录文件

/*
     * FTP getFileList
     * @param filenames       保存遍历的文件名
     * @param path    遍历目录的路径
     * */
    public static void getFtpFileList(List<String> filenames,String path){
        //DataInputStream ds = null;
        BufferedReader ds = null;
        FtpClient ftpClient = getConnect();
        try {
            ds = new BufferedReader(new InputStreamReader(ftpClient.nameList(path),"ISO-8859-1"));
            String line = "";
            while((line = ds.readLine())!=null){
                line = new String(line.getBytes("ISO-8859-1"),"GBK");
                String name[] = line.split("/");
                filenames.add(name[name.length - 1]);
            }
        } catch (FtpProtocolException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally{
            try {
                ds.close();
                ftpClient.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }