Java中实现SFTP操作

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
import java.util.Vector;
import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger
import com.jcraft.jsch.Channel;
import com.jcraft.jsch.ChannelSftp;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Session;
import com.jcraft.jsch.SftpException;


public class SFTPAccesser {

    private static Logger log = Logger.getRootLogger();
    /**
     * connect to SFTP Server
     * If can't connect to SFTP , it will re-try 
     * @param para
     * @param count  connect retry count
     * @return isConnected
     * @throws InterruptedException 
     * @throws JSchException 
     */
    public static Boolean connectSFTP(SFTPParameter para, Integer count) throws InterruptedException, JSchException {
        Boolean ret = false;
        if (para == null)
            return ret;
        if (count == 1) {
                    int interval = para.checkInterval();
                    Thread.sleep(interval);
        }
        if (count == 0)
            count = 1;
        if (para.isConnected)
            return true;
        if (StringUtils.isEmpty(para.hostName) || para.port == 0
                || para.userName == null || para.passWord == null) {
            log.error("SFTP connect parameter error !");
            para.release() ;
            return ret;
        }

            ChannelSftp csftp = null;
            Session session = null;
            Channel channel = null;
            JSch jsch = new JSch();
            //if key file is not null
            if(StringUtils.isNotBlank(para.sftpKeyFile)){
                if(StringUtils.isBlank(para.passWord)){
                    jsch.addIdentity(para.sftpKeyFile);
                }else{
                    jsch.addIdentity(para.sftpKeyFile, para.passWord);
                }
            }
            //skip key checking
            Properties config = new java.util.Properties();
            config.put("StrictHostKeyChecking", "no");
            session = jsch.getSession(para.userName, para.hostName, para.port);
            session.setConfig(config);
            if(StringUtils.isBlank(para.sftpKeyFile)){
                session.setPassword(para.passWord);
            }

        int i = 0;
        while (true) {
            i++;
            try {
                session.connect();
                channel = session.openChannel("sftp");
                channel.connect();
                csftp = (ChannelSftp) channel;
                ret = true;
                para.isConnected = true;
                para.sftp = csftp ;
                log.info("Successfully connect to " + para.hostName + ":" + para.port + " with " + para.userName);
                break;
            } catch (Exception ex) {
                log.error(ex);
                para.isConnected = false;
                if (i >= count) {
                    log.info(para.toString());
                    log.error(
                            "Can't connect SFTP Server, have already tried" + i
                                    + "times!");
                    try {
                        int interval = para.checkInterval();
                        Thread.sleep(interval);
                    } catch (Exception e) {
                        log.error(ex);
                    }
                    break;
                } else {
                    try {
                        int interval = para.checkInterval();
                        log.error(
                                "Can't connect SFTP Server，waiting for "
                                        + interval + "seconds try again!");
                        Thread.sleep(interval);
                    } catch (InterruptedException e) {
                        log.error(e);
                        break;
                    }
                }

            }

        }// end of while
        return ret;
    }

    /**
     * get SFTP Server file list .
     *@param para
     *@return List 
     * @throws SftpException 
     * @throws JSchException 
     * @throws InterruptedException 
     */
    public static List getFiles(SFTPParameter para) throws InterruptedException, JSchException, SftpException {
        List files = new ArrayList();
        if (para != null) {
            if (connectSFTP(para, para.conFTPTryCount)) {
                ChannelSftp cs = para.sftp;
                    Vector fs = null;
                    fs = cs.ls(para.downloadPath);

                    for (ChannelSftp.LsEntry entry : fs) {
                        if (!entry.getAttrs().isDir()) {
                        files.add(entry);
                        }
                    }
            }

        }
        return files;
    }
    /**
     * download files from SFTP
     * @param para
     * @return
     * @throws InterruptedException
     * @throws JSchException
     * @throws SftpException
     * @throws IOException 
     */
    public static Boolean downloadFiles(SFTPParameter para) throws InterruptedException, JSchException, SftpException{
        Boolean ret = true ;
        List files = getFiles(para) ;
        if(!para.isConnected) connectSFTP(para, para.conFTPTryCount) ;
        for(ChannelSftp.LsEntry file : files){
            ChannelSftp cs = para.sftp;
            if(!para.downloadPath.endsWith("/")) para.downloadPath = para.downloadPath + "/" ;
            if(!para.savePath.endsWith("/")) para.savePath = para.savePath + "/" ;
            String fromFile = para.downloadPath + file.getFilename() ;
            String toFile = para.savePath  + file.getFilename() ;
            cs.get(fromFile, toFile);
        }
        return ret ;
    }

    /**
     * upload file to SFTP 
     * @param para
     * @param file
     * @return
     * @throws InterruptedException
     * @throws JSchException
     * @throws SftpException
     */
    public static Boolean uploadFile(SFTPParameter para,File file) throws InterruptedException, JSchException, SftpException{
        Boolean ret = false ;
        if(!file.exists()) return ret ;
        if (connectSFTP(para, para.conFTPTryCount)) {
                ChannelSftp cs = para.sftp ;
                if(!para.uploadPath.endsWith("/")) para.uploadPath = para.uploadPath + "/" ;
                cs.put(file.getAbsolutePath(), para.uploadPath  + file.getName());
                ret = true ;
        }
        return ret ;
    }

    /**
     * upload files to SFTP server .
     *@param para
     *@param file
     *@return
     * @throws SftpException 
     * @throws JSchException 
     * @throws InterruptedException 
     */
    public static Boolean uploadFiles(SFTPParameter para,List files) throws InterruptedException, JSchException, SftpException{
        Boolean ret = true ;
        if(files == null || files.size() <= 0) return ret ;
            int  i = 0 ;
                for(File file : files){
                    if(!uploadFile(para, file)) i ++ ;
                }
                if(i > 0){
                log.error(i + " items were uploaded failed!");
                ret = false ;
                }
        return ret ;
    }


    /**
     * delete FTP server file . 
     * @param para
     * @param filepath file path must be /home/user/text.xxx
     * @return true or false
     * @throws SftpException 
     * @throws JSchException 
     * @throws InterruptedException 
     */
    public static Boolean deleteFile(SFTPParameter para,String filepath) throws InterruptedException, JSchException, SftpException{
        Boolean ret = false ;
        if(connectSFTP(para, para.conFTPTryCount)){
                para.sftp.rm(filepath);
                ret = true ;
        }
        return ret ;
    }


    /**
     * delete SFTP  files .
     * @param para
     * @return true or false
     * @throws SftpException 
     * @throws JSchException 
     * @throws InterruptedException 
     */
    public static Boolean deleteFiles(SFTPParameter para,List list) throws InterruptedException, JSchException, SftpException{
        Boolean ret = true ;
        if(list == null || list.size() <= 0)  ret = false;
        int i = 0 ;
        for(String s : list ){

            if(!deleteFile(para, s)) i ++  ;
        }
        if(i > 0){
            log.equals(i + " items were deleted failed!");
            ret = false ;
        }
        return ret ;
    }

    /**
     * is file exist in SFTP
     * @param para
     * @param path
     * @param file
     * @return
     * @throws InterruptedException
     * @throws JSchException
     * @throws SftpException
     */
    public static boolean isFileExist(SFTPParameter para,String path, String file) throws InterruptedException, JSchException, SftpException
             {
        if(connectSFTP(para, para.conFTPTryCount)){
            Vector files = null;
            ChannelSftp cs = para.sftp ;
            files = cs.ls(path);
            for (ChannelSftp.LsEntry entry : files) {
                if (!entry.getAttrs().isDir()
                        && entry.getFilename().equals(file)) {
                    return true;
                }
            }
        }

        return false;
    }


    /**
     * is file exist in SFTP
     * @param para
     * @param path
     * @param file
     * @return
     * @throws InterruptedException
     * @throws JSchException
     * @throws SftpException
     */
    public static boolean isDirExist(SFTPParameter para,String path, String dirname) throws InterruptedException, JSchException, SftpException
             {
        if(connectSFTP(para, para.conFTPTryCount)){
            Vector files = null;
            ChannelSftp cs = para.sftp ;
            files = cs.ls(path);
            for (ChannelSftp.LsEntry entry : files) {
                if (entry.getAttrs().isDir()
                        && entry.getFilename().equals(dirname)) {
                    return true;
                }
            }
        }

        return false;
    }
    /**
     * make dir
     * @param para
     * @param makeDir  like /home/ccc/bbb
     * @throws InterruptedException
     * @throws JSchException
     * @throws SftpException
     */
    public static void makeDir(SFTPParameter para,String makeDir) throws InterruptedException, JSchException, SftpException {
        if("".equals(makeDir) || makeDir == null) return;
        connectSFTP(para, para.conFTPTryCount) ;
        ChannelSftp cs = para.sftp ;
        String[] makedirs = makeDir.split("\\/") ;
        String ls = "/" ;
        for(String dir : makedirs){
            // if dir is not null and empty 
            if(  !"".equals(dir) && !isDirExist(para, ls, dir) ){
                ls += dir +"/";
                cs.mkdir(dir);
                cs.cd(dir);
            }else if(!"".equals(dir)){
                ls += dir +"/";
                cs.cd(ls);
            }

        }
    }

    public static void main(String[] args) {
        SFTPParameter para = new SFTPParameter() ;
        para.hostName ="10.37.240.35" ;
        para.userName = "cfiusr" ;
        para.passWord = "password" ;
        para.port = 22 ;
        para.downloadPath = "/home/cfiusr/test" ;
        para.savePath ="D:/test";
        para.uploadPath ="/home/cfiusr/test";
        File file = new File("D:/appl/cmd.txt") ;
        String delFile = "/home/cfiusr/test/cmd.txt";
        try {
            String makeDir = "/home/cfiusr/D/E/F/G/H/J/kk";
            makeDir(para,makeDir) ;
            //downloadFiles(para);
            //uploadFile(para, file);
            //deleteFile(para, delFile);
            para.release();
            System.exit(1);

        } catch (Exception e) {
            e.printStackTrace();
            System.exit(1);
        } 

    }


}

import com.jcraft.jsch.ChannelSftp;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Session;


public class SFTPParameter {

    public String hostName;

    public int port = 0;

    public String userName;

    public String passWord;

    public String sftpKeyFile ;

    public String downloadPath;

    public String savePath;

    public String uploadPath;

    public static int CON_FTP_TRYCOUNT_DEFAULT = 3;

    public static int CON_FTP_TRYINTERVAL_DEFAULT = 1;

    public int conFTPTryCount = 0;

    public int conFTPTryInterval = 1;

    public ChannelSftp sftp = null ; 

    public Boolean isConnected = false;

    public int checkInterval() {
        if (0 == this.conFTPTryInterval)
            return CON_FTP_TRYINTERVAL_DEFAULT * 1000;
        else
            return this.conFTPTryInterval * 1000;
    }

    public int checkCount() {
        if (this.conFTPTryCount <= 0)
            return CON_FTP_TRYCOUNT_DEFAULT;
        else
            return this.conFTPTryCount;
    }

    public void release() throws JSchException {
        if (sftp != null) {
            Session session = sftp.getSession();
            sftp.disconnect();
            if (session != null) {
                session.disconnect();
            }
        }
        isConnected = false;
    }
}