JAVA代码实现SFTP文件下载

一、SFTP文件的下载和FTP下载差别较大，需要下载jsch-0.1.53.jar包 。关于jsch的详细资料，可以查看官网：http://www.jcraft.com/jsch/

二、定制工具类FTPUtil.java

package common;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.SocketException;
import java.util.Properties;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPReply;

import com.jcraft.jsch.Channel;
import com.jcraft.jsch.ChannelSftp;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Session;

public class FtpUtil {

private final static Log logger = LogFactory.getLog(FtpUtil.class);

/*
* 从SFTP服务器下载文件
*
* @param ftpHost SFTP IP地址
*
* @param ftpUserName SFTP 用户名
*
* @param ftpPassword SFTP用户名密码
*
* @param ftpPort SFTP端口
*
* @param ftpPath SFTP服务器中文件所在路径 格式： ftptest/aa
*
* @param localPath 下载到本地的位置 格式：H:/download
*
* @param fileName 文件名称
*/
public static void downloadSftpFile(String ftpHost, String ftpUserName,
String ftpPassword, int ftpPort, String ftpPath, String localPath,
String fileName) throws JSchException {
Session session = null;
Channel channel = null;

JSch jsch = new JSch();
session = jsch.getSession(ftpUserName, ftpHost, ftpPort);
session.setPassword(ftpPassword);
session.setTimeout(100000);
Properties config = new Properties();
config.put("StrictHostKeyChecking", "no");
session.setConfig(config);
session.connect();

channel = session.openChannel("sftp");
channel.connect();
ChannelSftp chSftp = (ChannelSftp) channel;

String ftpFilePath = ftpPath + "/" + fileName;
String localFilePath = localPath + File.separatorChar + fileName;

try {
chSftp.get(ftpFilePath, localPath);
} catch (Exception e) {
e.printStackTrace();
logger.info("download error.");
} finally {
chSftp.quit();
channel.disconnect();
session.disconnect();
}

}

}

三、测试代码
package scripts.testscript;

import org.testng.annotations.Test;

import com.jcraft.jsch.JSchException;

import common.FtpUtil;

public class SftpDownloadTestScript {
@Test
public void run() throws JSchException {

String ftpHost = "192.168.26.132";
String ftpUserName = "zyf";
String ftpPassword = "zyf";
int ftpPort = 22;
String ftpPath = "ftpdir/";
String localPath = "H:/download";
String fileName = "11.txt";
FtpUtil.downloadSftpFile(ftpHost, ftpUserName, ftpPassword, ftpPort, ftpPath, localPath, fileName);
}
}