sftp免密登录

public class LogInSftpByPubKey {
 private static final Logger logger=LoggerFactory.getLogger(AuthSftpByPubKey.class);
 
 /**session 超时时间 1分钟**/
 private static final int SESSION_TIME_OUT=60000;//60s

 /**
  *
  * 方法说明：上传本地文件至SFTP服务器指定目录

  *
  * @param privKeyPath 本地私钥文件绝对路径 eg:../../id_rsa
  * @param remoteUser 目标SFTP服务器用户
  * @param port 目标主机地址
  * @param host 目标端口
  * @return ChannelSftp
  * @throws Exception Exception
  */
 public static ChannelSftp getChannel(String privKeyPath,String remoteUser,int port,String host) throws ServiceException{
   JSch jsch = new JSch();
   //密钥文件绝对路径
   Channel channel=null;
   try {
    jsch.addIdentity(privKeyPath);
    //用户名
    Session session = jsch.getSession(remoteUser, host, port);
    Properties config = new Properties();
    config.put("StrictHostKeyChecking", "no");
    session.setConfig(config);
    session.setTimeout(SESSION_TIME_OUT);
    session.connect();
    channel = session.openChannel("sftp");
    channel.connect();
   } catch (JSchException e) {
    throw new ServiceException(ExceptionCode.OTHER_EXCEPTION,String.format("获取sftp连接异常:%s", e.toString()));
   }
   return (ChannelSftp)channel;
 }
 
 /**
  *
  * 方法说明：上传文件到远程SFTP服务器上

  *
  * @param sftp sftp
  * @param remoteUploadDir 远程上传目录  eg: ~/upload/
  * @param fileAbsPath 要上传的文件本地绝对路径 eg: /weblogic/test.txt
  * @throws ServiceException ServiceException
  */
 public static void upload(ChannelSftp sftp,String remoteUploadDir,String fileAbsPath) throws ServiceException{
  //check param
  if(StringUtils.isEmpty(fileAbsPath)||StringUtils.isEmpty(remoteUploadDir)){
   throw new ServiceException(ExceptionCode.ILLEGAL_ARGUMENT, "上传文件绝对路径或远程目录不能为空");
  }
  File uploadFile=new File(fileAbsPath);
  if(!uploadFile.isFile()){
   throw new ServiceException(ExceptionCode.OTHER_EXCEPTION, String.format("文件路径:[%s]不是一个文件", fileAbsPath));
  }
  //upload
  try {
   sftp.cd(remoteUploadDir);
   sftp.put(new FileInputStream(uploadFile), uploadFile.getName());
  } catch (Exception e) {
   throw new ServiceException(ExceptionCode.OTHER_EXCEPTION, String.format("上传文件至SFTP服务器异常:%s",e.toString()));
  }
 }

 
 /**
  *
  * 方法说明：从SFTP服务器上指定目录下载指定文件到本地目录

  *
  * @param sftp sftp
  * @param localPath 本地路径 eg:/weblogic/test/
  * @param remoteAbsPath 远程要下载的文件绝对路径 eg:.../.../test.txt
  * @param localFileName 本地文件名
  * @throws ServiceException ServiceException
  */
 public static void download(ChannelSftp sftp,String localPath,String remoteAbsPath,String localFileName) throws ServiceException{
  //check param
  if (StringUtils.isEmpty(localPath)
    || StringUtils.isEmpty(remoteAbsPath)
    || StringUtils.isEmpty(localFileName)) {
   throw new ServiceException(ExceptionCode.ILLEGAL_ARGUMENT, "必须参数不能为空");
  }
  File localDir=new File(localPath);
  if(!localDir.isDirectory()){
   throw new ServiceException(ExceptionCode.OTHER_EXCEPTION,String.format("路径:[%s]不是一个目录", localPath));
  }
  try {
   @SuppressWarnings("unchecked")
   Vector vector=(Vector)sftp.ls(remoteAbsPath);
   if(vector==null||vector.size()!=1){
    //target file not exist!
    throw new ServiceException(ExceptionCode.OTHER_EXCEPTION,String.format("要下载的文件:[%s]不存在SFTP服务器上", localFileName));
   }
   //删除本地重名文件
   String fullFilePath=localPath.endsWith(File.separator)?localPath:(localPath+File.separator)+localFileName;
   File oldFile=new File(fullFilePath);
   if(oldFile.exists()){
    oldFile.delete();
   }
   sftp.get(remoteAbsPath, fullFilePath);
  } catch (SftpException e) {
   throw new ServiceException(ExceptionCode.OTHER_EXCEPTION, String.format("从SFTP服务器上下载文件异常:%s", e.toString()));
  }
 }
 
 public static void closeSession(ChannelSftp sftp){
  if(sftp!=null){
   try {
    sftp.getSession().disconnect();
   } catch (JSchException e) {
    logger.error("关闭SFTP session 异常",e);
   }
  }
 }