java sftp

package com.ikea.utils;


import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.Properties;
import java.util.Vector;
import com.jcraft.jsch.Channel;
import com.jcraft.jsch.ChannelSftp;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.Session;
import com.jcraft.jsch.SftpException;
import com.jcraft.jsch.ChannelSftp.LsEntry;

public class SFTPUtils {
    /**
     * 连接sftp服务器
     *
     * @param host
     *            主机
     * @param port
     *            端口
     * @param username
     *            用户名
     * @param password
     *            密码
     * @return
     */
    public ChannelSftp connect(String host, int port, String username,
            String password) {
        ChannelSftp sftp = null;
        try {
            JSch jsch = new JSch();
            jsch.getSession(username, host, port);
            Session sshSession = jsch.getSession(username, host, port);
            System.out.println("Session created.");
            sshSession.setPassword(password);
            Properties sshConfig = new Properties();
            sshConfig.put("StrictHostKeyChecking", "no");
            sshSession.setConfig(sshConfig);
            sshSession.connect();
            System.out.println("Session connected.");
            System.out.println("Opening Channel.");
            Channel channel = sshSession.openChannel("sftp");
            channel.connect();
            sftp = (ChannelSftp) channel;
//          sshSession.disconnect();
            System.out.println("Connected to " + host + ".");
        } catch (Exception e) {

        }
        return sftp;
    }

    /**
     * 上传文件
     *
     * @param directory
     *            上传的目录
     * @param uploadFile
     *            要上传的文件
     * @param sftp
     */
    public void upload(String directory, String uploadFile, ChannelSftp sftp) {
        try {
            sftp.cd(directory);
            File file = new File(uploadFile);
            sftp.put(new FileInputStream(file), file.getName());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 下载文件
     *
     * @param directory
     *            下载目录
     * @param downloadFile
     *            下载的文件
     * @param saveFile
     *            存在本地的路径
     * @param sftp
     */
    public void download(String directory, String downloadFile,
            String saveFile, ChannelSftp sftp) {
        try {
            sftp.cd(directory);
            File file = new File(saveFile);
            sftp.get(downloadFile, new FileOutputStream(file));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 删除文件
     *
     * @param directory
     *            要删除文件所在目录
     * @param deleteFile
     *            要删除的文件
     * @param sftp
     */
    public void delete(String directory, String deleteFile, ChannelSftp sftp) {
        try {
            sftp.cd(directory);
            sftp.rm(deleteFile);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 列出目录下的文件
     *
     * @param directory
     *            要列出的目录
     * @param sftp
     * @return
     * @throws SftpException
     */
    public Vector<LsEntry> listFiles(String directory, ChannelSftp sftp)
            throws SftpException {
        return sftp.ls(directory);
    }

    public static void main(String[] args) {
        SFTPUtils sf = new SFTPUtils();
        String host = "******";
        int port = 22;
        String username = "****";
        String password = "****";
        String directory = "/****/";
        String saveFile = "";
        String downLoadDirectory = "D:\\";
        ChannelSftp sftp = null;
        Session sshSession = null;
        try {
            JSch jsch = new JSch();
            jsch.getSession(username, host, port);
            sshSession = jsch.getSession(username, host, port);
            System.out.println("Session created.");
            sshSession.setPassword(password);
            Properties sshConfig = new Properties();
            sshConfig.put("StrictHostKeyChecking", "no");
            sshSession.setConfig(sshConfig);
            sshSession.connect();
            System.out.println("Session connected.");
            System.out.println("Opening Channel.");
            Channel channel = sshSession.openChannel("sftp");
            channel.connect();
            sftp = (ChannelSftp) channel;
            System.out.println("Connected to " + host + ".");



//          sf.upload(directory, uploadFile, sftp);
//          sf.download(directory, downloadFile, saveFile, sftp);
    //      sf.delete(directory, deleteFile, sftp);

//          sftp.cd(directory);


            Vector<LsEntry> v = sf.listFiles(directory, sftp);
            for (LsEntry e : v) {
                if(!e.getFilename().startsWith(".")) {
                    saveFile = downLoadDirectory + e.getFilename();
                    sf.download(directory, e.getFilename(), saveFile, sftp);
                }
            }
            System.out.println("finished");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            sftp.exit();
            sshSession.disconnect();
        }
    }
}