导入包jsch-0.1.43.jar
package com.network.manage.device.util;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
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;
import com.jcraft.jsch.SftpException;
public class SFTPUtil {
private static JSch jSch = new JSch();
private static ChannelSftp sftp = null;
private static Channel channel = null;
private static Session session = null;
public static boolean login(String hostname, int port, String username,
String password) {
try {
session = jSch.getSession(username, hostname, port);
session.setPassword(password);
Properties sshConfig = new Properties();
sshConfig.put("StrictHostKeyChecking", "no");
session.setConfig(sshConfig);
session.connect();
channel = session.openChannel("sftp");
channel.connect();
sftp = (ChannelSftp) channel;
return true;
} catch (JSchException e) {
System.err.println("SSH方式连接FTP服务器时有JSchException异常!");
System.err.println(e.getMessage());
return false;
}
}
public static boolean downloadFile(String hostname, int port,
String username, String password, String remotePath,
String remoteFilename, String localFilename) {
FileOutputStream output = null;
boolean success = false;
try {
// SSH方式登录FTP服务器
success = login(hostname, port, username, password);
//登录失败
if (!success) {
return success;
}
if (null != remotePath && remotePath.trim() != "") {
sftp.cd(remotePath);
}
File localFile = new File(localFilename);
//有文件和下载文件重名
if (localFile.exists()) {
sftp.disconnect();
System.err.println("文件: " + localFilename + " 已经存在!");
return success;
}
output = new FileOutputStream(localFile);
sftp.get(remoteFilename, output);
success = true;
} catch (SftpException e) {
System.err.println("接收文件时有SftpException异常!");
e.printStackTrace();
System.err.println(e.getMessage());
return success;
} catch (IOException e) {
System.err.println("接收文件时有I/O异常!");
System.err.println(e.getMessage());
return success;
} finally {
try {
if (null != output) {
output.close();
}
} catch (IOException e) {
System.err.println("关闭文件时出错!");
System.err.println(e.getMessage());
}
if (sftp.isConnected()) {
sftp.disconnect();
}
if (channel.isConnected()) {
channel.disconnect();
}
if (session.isConnected()) {
session.disconnect();
}
}
return success;
}
public static boolean uploadFile(String hostname, int port,
String username, String password, String remotePath,
String remoteFilename, InputStream input) {
boolean success = false;
try {
// SSH方式登录FTP服务器
success = login(hostname, port, username, password);
//登录失败
if (!success) {
return success;
}
// 更改服务器目录
if (null != remotePath && remotePath.trim() != "") {
sftp.cd(remotePath);
}
// 发送文件
sftp.put(input, remoteFilename);
success = true;
} catch (SftpException e) {
System.err.println("发送文件时有SftpException异常!");
e.printStackTrace();
System.err.println(e.getMessage());
return success;
} catch (Exception e) {
System.err.println("发送文件时有异常!");
System.err.println(e.getMessage());
return success;
} finally {
try {
if (null != input) {
input.close();
}
} catch (IOException e) {
System.err.println("关闭文件时出错!");
System.err.println(e.getMessage());
}
if (sftp.isConnected()) {
sftp.disconnect();
}
if (channel.isConnected()) {
channel.disconnect();
}
if (session.isConnected()) {
session.disconnect();
}
}
return success;
}
public static boolean deleteFile(String hostname, int port, String username,
String password, String remotePath, String remoteFilename) {
boolean success = false;
try {
// SSH方式登录FTP服务器
success = login(hostname, port, username, password);
//登录失败
if (!success) {
return success;
}
// 更改服务器目录
if (null != remotePath && remotePath.trim() != "") {
sftp.cd(remotePath);
}
// 删除文件
sftp.rm(remoteFilename);
success = true;
} catch (SftpException e) {
System.err.println("删除文件时有SftpException异常!");
e.printStackTrace();
System.err.println(e.getMessage());
return success;
} catch (Exception e) {
System.err.println("删除文件时有异常!");
System.err.println(e.getMessage());
return success;
} finally {
if (sftp.isConnected()) {
sftp.disconnect();
}
if (channel.isConnected()) {
channel.disconnect();
}
if (session.isConnected()) {
session.disconnect();
}
}
return success;
}
}