SFTP和FTP的下载和上传

SFTP:

获取连接:

public class SFTPChannel {
    
    private static final Logger log = LoggerFactory.getLogger(SFTPChannel.class);
    
    private static final int SFTP_DEFAULT_TIMEOUT = 60000; //sftp链接默认超时时间为60s
    
    private Session session = null;
    
    private Channel channel = null;
    
    /**
     * 获取sftp通道连接
     * @param host 主机ip
     * @param port 主机端口
     * @param username sftp用户名
     * @param password sftp密码
     * @return
     * @throws JSchException 
     */
    public ChannelSftp connect(String host,int port,String username, String password) throws JSchException
    {
        
        JSch jsch = new JSch(); // 创建JSch对象
        session = jsch.getSession(username, host, port); // 根据用户名,主机ip,端口获取一个Session对象
        log.info("Session created.sftp://:{}:{}@{}:{}",username,password,host,port);
        if (password != null)
        {
            session.setPassword(password); // 设置密码
        }
        Properties config = new Properties();
        config.put("StrictHostKeyChecking", "no");
        session.setConfig(config); // 为Session对象设置properties
        session.setTimeout(SFTP_DEFAULT_TIMEOUT); // 设置timeout时间
        session.connect(); // 通过Session建立链接
        log.info("Session connected.");

        log.info("Opening Channel.");
        channel = session.openChannel("sftp"); // 打开SFTP通道
        channel.connect(); // 建立SFTP通道的连接
        log.info("Connected successfully to ftpHost = {},as ftpUserName = {}, returning: " + channel,host,port);
        return (ChannelSftp) channel;
    }

进行下载:

    /**
     * sftp文件下载
     * @param sftp sftp通道
     * @param directory sftp下载目录
     * @param downloadFileName sftp下载的文件名
     * @param savePath sftp文件保存的路径
     * @throws Exception
     */
    public static void download(ChannelSftp sftp,String directory,String downloadFileName,String savePath) throws Exception
    {
        File file = new File(savePath);
        if (!file.exists())
        {
            file.mkdirs();
        }
        log.info("保存的文件路径:{}",savePath);
        log.info("sftp服务器文件的路径:{}" , directory);
        FileOutputStream ous = null;
        try {
            ous = new FileOutputStream(savePath+ File.separator + downloadFileName);
            sftp.cd(directory);//切换到服务器目录
            sftp.get(downloadFileName, ous);
            log.info("下载文件{}成功!",downloadFileName);
        } catch (FileNotFoundException e) {
            log.info(e.getMessage(),e);
        } catch (SftpException e) {
            log.info("下载文件{}失败!",downloadFileName);
            log.info(e.getMessage(),e);
            throw new Exception("服务器上的文件:" + downloadFileName + "没有获取到!");
            /*File file2 = new File(savePath+ File.separator + downloadFileName);
            if(file2.exists() && file2.isFile() && file2.length()==0)
                if(!file2.delete())
                {
                    log.error("请关闭使用该文件的所有进程或者流!!",e);
                }
                else
                {
                    log.info("文件大小为:"+file2.length()+"字节的文件:"+file2.getName()+"已经被成功删除!!");
                }*/
        } finally {
                ous.close();
                //sftp.quit();
        }
    }

 controller层的代码:

   public void dwAlipayBill() {
        long begintime = System.currentTimeMillis();
        DateBean dateBean = new DateBean();
        String date = dateBean.getYesterdayDate("");
        //date = "20151103";
        String fileName = pid + "_" + date + ".zip";
        SFTPChannel channel = new SFTPChannel();
        ChannelSftp chsftp = null;
        File file = new File(alipay_sftp_savepath + date + File.separator + fileName);
        if (!file.exists()) {
            try {
                chsftp = channel.connect(alipay_sftp_ip, alipay_sftp_port, alipay_sftp_username, alipay_sftp_password);
                SFTPUtils.download(chsftp, alipay_sftp_path + "download/" + date, fileName, alipay_sftp_savepath + date);
            } catch (JSchException e) {
                log.error("sftp登录异常", e);
            } catch (Exception e) {
                log.error(e.getMessage(),e);
            } finally {
                chsftp.quit();
                channel.closeChannel();
            }
        } else {
            log.error("{}文件已经存在,不需要重复下载!!", fileName);
        }
        //文件下载失败时删除临时创建的空文件
        //File file = new File(alipay_sftp_savepath + date + File.separator + fileName);
        if (file.exists() && file.isFile() && file.length() == 0)
            if (!file.delete()) {
                log.error("请关闭使用该文件的所有进程或者流!!");
            } else {
                log.info("文件大小为:" + file.length() + "字节的文件:" + file.getName() + "已经被成功删除!!");
            }
        long endtime = System.currentTimeMillis();
        log.info("{}的支付宝对账单下载成功,用时{}毫秒。", date, (endtime - begintime));
    }

 如何直接读取zip文件里的内容:

                String path = "D:\sasa.zip";
                ZipFile zf = new ZipFile(path);
               // new BufferedInputStream(new FileInputStream(path));
                InputStream in = new BufferedInputStream(new FileInputStream(path));
                Charset gbk = Charset.forName("gbk");
                ZipInputStream zin = new ZipInputStream(in,gbk);
                ZipEntry ze;
                while((ze = zin.getNextEntry()) != null){
                    if(ze.toString().endsWith("txt")){
                        BufferedReader br = new BufferedReader(
                                new InputStreamReader(zf.getInputStream(ze)));
                        String line;
                        while((line = br.readLine()) != null){
                            System.out.println(line.toString());
                        }
                        br.close();
                    }
                    System.out.println();
                }
                zin.closeEntry();

1 读取zip文件,可以通过ZipFile来读取。如果需要读取zip文件内部的一个一个文件。有两种方法。第一种是得到枚举。通过循环来读取

如:ZipFile zip=new ZipFile(new File(fileName));
Enumeration enumeration=zip.entries();//通过entries()循环来得到。
while(enumeration.hasMoreElements()){
ZipEntry zipEntry=(ZipEntry)enumeration.nextElement();
System.out.println(zipEntry.getName());
}


2 也可以通过getEntry(name)来得到zipEntry对象。
如:ZipFile zip=new ZipFile(new File(fileName));
ZipEntry zipEntry=zip.getEntry("channel_system_Chinese.txt");//通过getEntry(name)也可以得到指定的ZipEntry对象。
if(zipEntry!=null){
System.out.println("已发现该文件:"+zipEntry.getName());
}




综述:得到zip文件中的一个个zipEntry对象。可以通过ZipFile的entries()和getEntry(name)这两种来得到。第一种是循环,得到枚举。第二种是得到指定的。


完整的例子:
String fileName="D:\test1.zip";
new TestMain1().readZipEntry(fileName);


public void readZipEntry(String fileName){
try {
ZipFile zip=new ZipFile(new File(fileName));
Enumeration enumeration=zip.entries();
while(enumeration.hasMoreElements()){
ZipEntry zipEntry=(ZipEntry)enumeration.nextElement();
System.out.println(zipEntry.getName());
}

System.out.println("也可以通道文件名来得到zipEntry对象");
ZipEntry zipEntry=zip.getEntry("channel_system_Chinese.txt");
if(zipEntry!=null){
System.out.println("已发现该文件:"+zipEntry.getName());
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
} 
}

 从ftp下载:

    public static boolean downloadDuocaiBill(String host, int port, String username, String password, String remotePath,
            String date, String localPath) {
        FTPClient ftpClient = new FTPClient();
        try {
            ftpClient.connect(host, port);
            boolean isLoginSuccess = ftpClient.login(username, password);
            if (!isLoginSuccess) {
                LOGGER.info("FTP登录失败。");
                return false;
            }
            LOGGER.info("FTP登录成功。");
            
            ftpClient.changeWorkingDirectory(remotePath + File.separator + date);
            FTPFile[] files = ftpClient.listFiles();
            int fileCount = 0;
            File dir = new File(localPath + File.separator + date);
            if(!dir.exists()) {
                dir.mkdirs();
            }
            for (FTPFile file : files) {
                String fileName = file.getName();
                //对账文件名称为:接口编码(80)+YYYYMMDD + 序号(2位,00-47)+文件编号(4位,同一天如果文件太大,会拆分为多个文件).txt
                if (fileName.startsWith("80" + date + getDuocaiBillFileSeq()) && fileName.endsWith(".txt")) {
                    File localFile = new File(localPath + File.separator + date + File.separator + fileName);
                    OutputStream os = new FileOutputStream(localFile);
                    LOGGER.info("开始下载文件,文件名:{}。", fileName);
                    boolean isSuccess = ftpClient.retrieveFile(fileName, os);
                    os.close();
                    if(isSuccess) {
                        fileCount ++;
                        LOGGER.info("下载文件成功,文件名:{}。", fileName);
                    }else {
                        LOGGER.info("下载文件失败,文件名:{}。", fileName);
                    }
                }
            }
            ftpClient.logout();

            if(fileCount == 0) {
                LOGGER.info("未找到待下载文件。");
                return false;
            }else {
                LOGGER.info("下载文件结束,共下载{}个文件。", fileCount);
                return true;
            }
        } catch (Exception e) {
            LOGGER.info("下载文件失败,原因:{}。", e.getMessage());
            return false;
        } finally {
            if (ftpClient.isConnected()) {
                try {
                    ftpClient.disconnect();
                } catch (IOException ioe) {
                    LOGGER.info("关闭FTP客户端失败,原因:{}。", ioe.getMessage());
                }
            }
        }
    }
原文地址:https://www.cnblogs.com/cherishforchen/p/11193230.html