JSch - Java实现的SFTP(文件上传详解篇)
JSch是Java Secure Channel的缩写。JSch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。
本文只介绍如何使用JSch实现的SFTP功能。
SFTP是Secure File Transfer Protocol的缩写,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。SFTP是使用加密传输认证信息和传输的数据,所以,使用SFTP是非常安全的。但是,由于这种传输方式使用了加密/解密技术,所以传输效率比普通的FTP要低得多,如果您对网络安全性要求更高时,可以使用SFTP代替FTP。(来自百度的解释)
要使用JSch,需要下载它的jar包,请从官网下载它:http://www.jcraft.com/jsch/package com.ebao.jewel.gs.integration.pub.connection.impl; import java.io.FileNotFoundException; import java.io.OutputStream; import java.net.UnknownHostException; import java.util.Properties; import java.util.Vector; import org.apache.commons.httpclient.auth.AuthenticationException; import com.ebao.jewel.gs.integration.pub.CommonLog.exception.ExceptionUtil; import com.ebao.jewel.gs.integration.pub.CommonLog.utils.JewelIntLogUtils; import com.ebao.jewel.gs.integration.pub.commons.InterfaceUtil; import com.ebao.jewel.gs.integration.pub.connection.IConnection; import com.ebao.jewel.gs.integration.pub.constants.InterfaceConstants; import com.jcraft.jsch.ChannelSftp; import com.jcraft.jsch.JSch; import com.jcraft.jsch.JSchException; import com.jcraft.jsch.Session; public class JewelSftpClient implements IConnection { private Session sshSession = null; private ChannelSftp channelSftp = null; private int connectTimes = 0; public boolean connect(String host, int port, String username, String pwd) throws Exception { if (sshSession == null || !sshSession.isConnected()) { JSch jsch = new JSch(); try { sshSession = jsch.getSession(username, host, port); } catch (JSchException je) { // throw new Connection throw je; } } if (!sshSession.isConnected()) { InterfaceUtil.batchLog("[TEST] sshSession.connect()"); sshSession.setPassword(pwd); Properties sshConfig = new Properties(); sshConfig.put("StrictHostKeyChecking", "no"); sshSession.setConfig(sshConfig); try { sshSession.connect(); } catch (JSchException ex) { if (ex.getMessage().indexOf("Session.connect") != -1) { throw new UnknownHostException(ExceptionUtil.getExceptionMsg(ex)); } else { throw new AuthenticationException(ExceptionUtil.getExceptionMsg(ex)); } } } InterfaceUtil.batchLog("[TEST] sshSession has connected."); try { if (channelSftp == null || !channelSftp.isConnected()) { InterfaceUtil.batchLog("[TEST] channelSftp.connect()"); channelSftp = (ChannelSftp) sshSession.openChannel("sftp"); channelSftp.connect(); } InterfaceUtil.batchLog("[TEST] channelSftp has been established."); return true; } catch (JSchException je) { if (connectTimes++ < InterfaceConstants.MAX_CONNECT_TIMES) { String seq = connectTimes == 1 ? "1st" : connectTimes == 2 ? "2nd" : connectTimes == 3 ? "3rd" : connectTimes + "st"; InterfaceUtil.batchLog("[TEST]" + seq + " connection failed. Disconnected " + (disconnect() == true ? "succeeded" : "failed")); long sleepTime = InterfaceUtil.getConnectSleepTime() * 1000L; Thread.sleep(sleepTime); InterfaceUtil.batchLog("[TEST]" + sleepTime + " ms passed. Try " + (int) (connectTimes + 1) + " connection."); if (connectTimes == 4) { InterfaceUtil .batchLog("[TEST] !!!!!!!!!!!connection goes wrong!!!!!!!!!!!!!!!!"); } return connect(host, port, username, pwd); } else { InterfaceUtil.batchLog("[TEST] connect excceeded 10 times."); throw je; } } } public boolean disconnect() throws Exception { try { if (channelSftp != null && channelSftp.isConnected()) { channelSftp.disconnect(); InterfaceUtil.batchLog("[TEST] channelSftp has cloesd."); } if (sshSession != null && sshSession.isConnected()) { sshSession.disconnect(); InterfaceUtil.batchLog("[TEST] sshSession has cloesd."); } return true; } catch (Exception e) { return false; } } public void upload(String src, String dst) throws Exception { channelSftp.put(src, dst); } public void download(String src, String dst) throws Exception { channelSftp.get(src, dst); } @SuppressWarnings("unchecked") public Vector<Object> listFiles(String directory) throws Exception { try { channelSftp.cd(directory); } catch (Exception e) { throw new FileNotFoundException("No such file or directory.src:" + directory); } Vector<Object> files = channelSftp.lsnames(directory); return files; } public boolean moveFile(String src, String dst) throws Exception { try { channelSftp.rename(src, dst); return true; } catch (Exception e) { JewelIntLogUtils.batchLog("[TEST] Move the file from " + src + " to " + dst + " fail", e); throw e; } } public boolean isConnected() { return channelSftp != null && channelSftp.isConnected(); } @Override public void download(String src, OutputStream out) throws Exception { channelSftp.get(src, out); } }
来自:http://www.cnblogs.com/longyg/archive/2012/06/25/2556576.html