JAVA SFTP文件上传、下载及批量下载实例

网友投稿 1134 2023-06-02


JAVA SFTP文件上传、下载及批量下载实例

1.jsch官方API查看地址(附件为需要的jar)

http://jcraft.com/jsch/

2.jsch简介

JSch(java Secure Channel)是一个SSH2的纯Java实现。它允许你连接到一个SSH服务器,并且可以使用端口转发,X11转发,文件传输等,当然你也可以集成它的功能到你自己的应用程序。

SFTP(Secure File Transfer Protocol)安全文件传送协议。可以为传输文件提供一种安全的加密方法。SFTP 为 SSH的一部份,是一种传输文件到服务器的安全方式,但是传输效率比普通的FTP要低。

3.api常用的方法:

put():      文件上传

get():      文件下载

cd():       进入指定目录

ls():       得到指定目录下的文件列表

rename():   重命名指定文件或目录

rm():       删除指定文件

mkdir():    创建目录

rmdir():    删除目录

put和get都有多个重载方法,自己看源代码

4.对常用方法的使用,封装成一个util类

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

import java.util.Properties;

import java.util.Vector;

import org.apache.log4j.Logger;

import com.jcraft.jsch.Channel;

import com.jcraft.jsch.ChannelSftp;

import com.jcraft.jsch.JSch;

import com.jcraft.jsch.Session;

import com.jcraft.jsch.SftpATTRS;

import com.jcraft.jsch.SftpException;

import com.jcraft.jsch.ChannelSftp.LsEntry;

/**

* sftp工具类

*

* @author xxx

* @date 2014-6-17

* @time 下午1:39:44

* @version 1.0

*/

public class SFTPUtils

{

private static Logger log = Logger.getLogger(SFTPUtils.class.getName());

private String host;//服务器连接ip

private String username;//用户名

private String password;//密码

private int port = 22;//端口号

private ChannelSftp sftp = null;

private Session sshSession = null;

public SFTPUtils(){}

public SFTPUtils(String host, int port, String username, String password)

{

this.host = host;

this.username = username;

this.password = password;

this.port = port;

}

public SFTPUtils(String host, String username, String password)

{

this.host = host;

this.username = username;

this.password = password;

}

/**

* 通过SFTP连接服务器

*/

public void connect()

{

try

{

JSch jsch = new JSch();

jsch.getSession(username, host, port);

sshSession = jsch.getSession(username, host, port);

if (log.isInfoEnabled())

{

log.info("Session created.");

}

sshSession.setPassword(password);

Properties sshConfig = new Properties();

sshConfig.put("StrictHostKeyChecking", "no");

sshSession.setConfig(sshConfig);

sshSession.connect();

if (log.isInfoEnabled())

{

log.info("Session connected.");

}

Channel channel = sshSession.openChannel("sftp");

channel.connect();

if (log.isInfoEnabled())

{

log.info("Opening Channel.");

}

sftp = (ChannelSftp) channel;

if (log.isInfoEnabled())

{

log.info("Connected to " + host + ".");

}

}

catch (Exception e)

{

e.printStackTrace();

}

}

/**

* 关闭连接

*/

public void disconnect()

{

if (this.sftp != null)

{

if (this.sftp.isConnected())

{

this.sftp.disconnect();

if (log.isInfoEnabled())

{

log.info("sftp is closed already");

}

}

}

if (this.sshSession != null)

{

if (this.sshSession.isConnected())

{

this.sshSession.disconnect();

if (log.isInfoEnabled())

{

log.info("sshSession is closed already"EXYOj);

}

}

}

}

/**

* 批量下载文件

* @param remotPath:远程下载目录(以路径符号结束,可以为相对路径eg:/assess/sftp/jiesuan_2/2014/)

* @param localPath:本地保存目录(以路径符号结束,D:\Duansha\sftp\)

* @param fileFormat:下载文件格式(以特定字符开头,为空不做检验)

* @param fileEndFormat:下载文件格式(文件格式)

* @param del:下载后是否删除sftp文件

* @return

*/

public List batchDownLoadFile(String remotePath, String localPath,

String fileFormat, String fileEndFormat, boolean del)

{

List filenames = new ArrayList();

try

{

// connect();

Vector v = listFiles(remotePath);

// sftp.cd(remotePath);

if (v.size() > 0)

{

System.out.println("本次处理文件个数不为零,开始下载...fileSize=" + v.size());

Iterator it = v.iterator();

while (it.hasNext())

{

LsEntry entry = (LsEntry) it.next();

String filename = entry.getFilename();

SftpATTRS attrs = entry.getAttrs();

if (!attrs.isDir())

{

boolean flag = false;

String localFileName = localPath + filename;

fileFormat = fileFormat == null ? "" : fileFormat

.trim();

fileEndFormat = fileEndFormat == null ? ""

: fileEndFormat.trim();

// 三种情况

if (fileFormat.length() > 0 && fileEndFormat.length() > 0)

{

if (filename.startsWith(fileFormat) && filename.endsWith(fileEndFormat))

{

flag = downloadFile(remotePath, filename,localPath, filename);

if (flag)

{

filenames.add(localFileName);

if (flag && del)

{

deleteSFTP(remotePath, filename);

}

}

}

}

else if (fileFormat.length() > 0 && "".equals(fileEndFormat))

{

if (filename.startsWith(fileFormat))

{

flag = downloadFile(remotePath, filename, localPath, filename);

if (flag)

{

filenames.add(localFileName);

if (flag && del)

{

deleteSFTP(remotePath, filename);

}

}

}

}

else if (fileEndFormat.length() > 0 && "".equals(fileFormat))

{

if (filename.endsWith(fileEndFormat))

{

flag = downloadFile(remotePath, filename,localPath, filename);

if (flag)

{

filenames.add(localFileName);

if (flag && del)

{

deleteSFTP(remotePath, filename);

}

}

}

}

else

{

flag = downloadFile(remotePath, filename,localPath, filename);

if (flag)

{

filenames.add(localFileName);

if (flag && del)

{

deleteSFTP(remotePath, filename);

}

}

}

}

}

}

if (log.isInfoEnabled())

{

log.info("download file is success:remotePath=" + remotePath

+ "and localPath=" + localPath + ",file size is"

+ v.size());

}

}

catch (SftpException e)

{

e.printStackTrace();

}

finally

{

// this.disconnect();

}

return filenames;

}

/**

* 下载单个文件

* @param remotPath:远程下载目录(以路径符号结束)

* @param remoteFileName:下载文件名

* @param localPath:本地保存目录(以路径符号结束)

* @param localFileName:保存文件名

* @return

*/

public boolean downloadFile(String remotePath, String remoteFileName,String localPath, String localFileName)

{

FileOutputStream fieloutput = null;

try

{

// sftp.cd(remotePath);

File file = new File(localPath + localFileName);

// mkdirs(localPath + localFileName);

fieloutput = new FileOutputStream(file);

sftp.get(remotePath + remoteFileName, fieloutput);

if (log.isInfoEnabled())

{

log.info("===DownloadFile:" + remoteFileName + " success from sftp.");

}

return true;

}

catch (FileNotFoundException e)

{

e.printStackTrace();

}

catch (SftpException e)

{

e.printStackTrace();

}

finally

{

if (null != fieloutput)

{

try

{

fieloutput.close();

}

catch (IOException e)

{

e.printStackTrace();

}

}

}

return false;

}

/**

* 上传单个文件

* @param remotePath:远程保存目录

* @param remoteFileName:保存文件名

* @param localPath:本地上传目录(以路径符号结束)

* @param localFileName:上传的文件名

* @return

*/

public boolean uploadFile(String remotePath, String remoteFileName,String localPath, String localFileName)

{

FileInputStream in = null;

try

{

createDir(remotePath);

File file = new File(localPath + localFileName);

in = new FileInputStream(file);

sftp.put(in, remoteFileName);

return true;

}

catch (FileNotFoundException e)

{

e.printStackTrace();

}

catch (SftpException e)

{

e.printStackTrace();

}

finally

{

if (in != null)

{

try

{

in.close();

}

catch (IOException e)

{

e.printStackTrace();

}

}

}

return false;

}

/**

* 批量上传文件

* @param remotePath:远程保存目录

* @param localPath:本地上传目录(以路径符号结束)

* @param del:上传后是否删除本地文件

* @return

*/

public boolean bacthUploadFile(String remotePath, String localPath,

boolean del)

{

try

{

connect();

File file = new File(localPath);

File[] files = file.listFiles();

for (int i = 0; i < files.length; i++)

{

if (files[i].isFile()

&& files[i].getName().indexOf("bak") == -1)

{

if (this.uploadFile(remotePath, files[i].getName(),

localPath, files[i].getName())

&& del)

{

deleteFile(localPath + files[i].getName());

}

}

}

if (log.isInfoEnabled())

{

log.info("upload file is success:remotePath=" + remotePath

+ "and localPath=" + localPath + ",file size is "

+ files.length);

}

return true;

}

catch (Exception e)

{

e.printStackTrace();

}

finally

{

this.disconnect();

}

return false;

}

/**

* 删除本地文件

* @param filePath

* @return

*/

public boolean deleteFile(String filePath)

{

File file = new File(filePath);

if (!file.exists())

{

return false;

}

if (!file.isFile())

{

return false;

}

boolean rs = file.delete();

if (rs && log.isInfoEnabled())

{

log.info("delete file success from local.");

}

return rs;

}

/**

* 创建目录

* @param createpath

* @return

*/

public boolean createDir(String createpath)

{

try

{

if (isDirExist(createpath))

{

this.sftp.cd(createpath);

return true;

}

String pathArry[] = createpath.split("/");

StringBuffer filePath = new StringBuffer("/");

for (String path : pathArry)

{

if (path.equals(""))

{

continue;

}

filePath.append(path + "/");

if (isDirExist(filePath.toString()))

{

sftp.cd(filePath.toString());

}

else

{

// 建立目录

sftp.mkdir(filePath.toString());

// 进入并设置为当前目录

sftp.cd(filePath.toString());

}

}

this.sftp.cd(createpath);

return true;

}

catch (SftpException e)

{

e.printStackTrace();

}

return false;

}

/**

* 判断目录是否存在

* @param directory

* @return

*/

public boolean isDirExist(String directory)

{

boolean isDirExistFlag = false;

try

{

SftpATTRS sftpATTRS = sftp.lstat(directory);

isDirExistFlag = true;

return sftpATTRS.isDir();

}

catch (Exception e)

{

if (e.getMessage().toLowerCase().equals("no such file"))

{

isDirExistFlag = false;

}

}

return isDirExistFlag;

}

/**

* 删除stfp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 deleteSFTP(String directory, String deleteFile)

{

try

{

// sftp.cd(directory);

sftp.rm(directory + deleteFile);

if (log.isInfoEnabled())

{

log.info("delete file success from sftp.");

}

}

catch (Exception e)

{

e.printStackTrace();

}

}

/**

* 如果目录不存在就创建目录

* @param path

*/

public void mkdirs(String path)

{

File f = new File(path);

String fs = f.getParent();

f = new File(fs);

if (!f.exists())

{

f.mkdirs();

}

}

/**

* 列出目录下的文件

*

* @param directory:要列出的目录

* @param sftp

* @return

* @throws SftpException

*/

public Vector listFiles(String directory) throws SftpException

{

return sftp.ls(directory);

}

public String getHost()

{

return host;

}

public void setHost(String host)

{

this.host = host;

}

public String getUsername()

{

return username;

}

public void setUsername(String username)

{

this.username = username;

}

public String getPassword()

{

return password;

}

public void setPassword(String password)

{

this.password = password;

}

public int getPort()

{

return port;

}

public void setPort(int port)

{

this.port = port;

}

public ChannelSftp getSftp()

{

return sftp;

}

public void setSftp(ChannelSftp sftp)

{

this.sftp = sftp;

}

/**测试*/

public static void main(String[] args)

{

SFTPUtils sftp = null;

// 本地存放地址

String localPath = "D:/tomcat5/webapps/ASSESS/DocumentsDir/DocumentTempDir/txtData/";

// Sftp下载路径

String sftpPath = "/home/assess/sftp/jiesuan_2/2014/";

List filePathList = new ArrayList();

try

{

sftp = new SFTPUtils("10.163.201.115", "tdcp", "tdcp");

sftp.connect();

// 下载

sftp.batchDownLoadFile(sftpPath, localPath, "ASSESS", ".txt", true);

}

catch (Exception e)

{

e.printStackTrace();

}

finally

{

sftp.disconnect();

}

}

}

5.需要的时间辅助类,顺带记下,下次可以直接拿来用

/**

* 时间处理工具类(简单的)

* @author Aaron

* @date 2014-6-17

* @time 下午1:39:44

* @version 1.0

*/

public class DateUtil {

/**

* 默认时间字符串的格式

*/

public static final String DEFAULT_FORMAT_STR = "yyyyMMddHHmmss";

public static final String DATE_FORMAT_STR = "yyyyMMdd";

/**

* 获取系统时间的昨天

* @return

*/

public static String getSysTime(){

Calendar ca = Calendar.getInstance();

ca.set(Calendar.DATE, ca.get(Calendar.DATE)-1);

Date d = ca.getTime();

SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");

String a = sdf.format(d);

return a;

}

/**

* 获取当前时间

* @param date

* @return

*/

public static String getCurrentDate(String formatStr)

{

if (null == formatStr)

{

formatStr=DEFAULT_FORMAT_STR;

}

return date2String(new Date(), formatStr);

}

/**

* 返回年月日

* @return yyyyMMdd

*/

public static String getTodayChar8(String dateFormat){

return DateFormatUtils.format(new Date(), dateFormat);

}

/**

* 将Date日期转换为String

* @param date

* @param formatStr

* @return

*/

public static String date2String(Date date, String formatStr)

{

if (null == date || null == formatStr)

{

return "";

}

SimpleDateFormat df = new SimpleDateFormat(formatStr);

return df.format(date);

}

}


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