ftp org.apache.commons.net.ftp.FTPClient 判斷文件是否存在

    String path = "/SJPT/ONPUT/HMD_TEST/" ; 
        FtpTool.getFTPClient().changeWorkingDirectory(path); 
        String reply = FtpTool.getFTPClient().getReplyString().substring(0, 3); 
        if (reply.equals("250")) { 
          System.out.println("We will now process the path since the server response  code was 250.\n"); 
        } else 
          System.out.println("Ignoring this path, since the server did not return the 250 success code!\n"+ "Most likely because the path does not exist.\n");