java实现sftp文件与文件夹上传windows和linux

写在前面：

linux一般自带sftp，而windows需要先搭建sftp服务器，比如freesshd，http://www.freesshd.com/?ctt=download，搭建好sftp服务后再用java程序连接进行上传下载操作，需要特别注意的是用java上传到windows的sftp时的上传路径，freesshd搭建sftp时会有个sftp home path，假如设置的是D:\sftpupload，如果要上传到D:\sftpupload\test，那么代码中的上传路径设置为"/test"即可，一定要带/

依赖包

    com.jcraft
    jsch
    0.1.54

工具类

package xxx.utils;

import com.jcraft.jsch.ChannelSftp;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.SftpException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;
import java.util.Properties;
import java.util.Vector;

public class SftpUtil {

    private static Logger logger = LoggerFactory.getLogger(SftpUtil.class);

    /**
     *
     * @param filePath 文件全路径
     * @param ftpPath 上传到目的端目录
     * @param username
     * @param password
     * @param host
     * @param port
     */
    public static void uploadFile(String filePath, String ftpPath, String username, String password, String host, Integer port) {
        FileInputStream input = null;
        ChannelSftp sftp = null;
        try {
            JSch jsch = new JSch();
            //获取session  账号-ip-端口
            com.jcraft.jsch.Session sshSession = jsch.getSession(username, host, port);
            //添加密码
            sshSession.setPassword(password);
            Properties sshConfig = new Properties();
            //严格主机密钥检查
            sshConfig.put("StrictHostKeyChecking", "no");
//            sshConfig.put("kex", "diffie-hellman-group1-sha1,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group-exchange-sha256");
            sshSession.setConfig(sshConfig);
            //开启session连接
            sshSession.connect();
            //获取sftp通道
            sftp = (ChannelSftp) sshSession.openChannel("sftp");
            //开启
            sftp.connect();
            //文件乱码处理
            /*Class c = ChannelSftp.class;
            Field f = c.getDeclaredField("server_version");
            f.setAccessible(true);
            f.set(sftp, 2);
            sftp.setFilenameEncoding("GBK");*/
            File file = new File(filePath);
            copyFile(sftp,file,ftpPath);
            logger.info("================SFTP上传成功！==================");
        } catch (Exception e) {
            logger.error("================SFTP上传失败！==================");
            e.printStackTrace();
        }
    }

    public static void copyFile(ChannelSftp sftp, File file, String pwd) {

        if (file.isDirectory()) {
            File[] list = file.listFiles();
            String fileName = file.getName();
            try {
                try {
                    try {
                        sftp.cd(pwd);
                    } catch (SftpException e) {
                        sftp.mkdir(pwd);
                        logger.info("上传根目录创建成功:" + pwd);
                        sftp.cd(pwd);
                    }
                    Vector ls = sftp.ls(fileName);
                } catch (Exception e) {
                    sftp.mkdir(fileName);
                    System.out.println("目录创建成功:" + sftp.pwd() + "/" + fileName);
                }
                pwd = pwd + "/" + fileName;
                try {

                    sftp.cd(fileName);
                } catch (SftpException e) {
                    e.printStackTrace();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            for (int i = 0; i < list.length; i++) {
                copyFile(sftp, list[i], pwd);
            }
        } else {
            try {
                sftp.cd(pwd);
            } catch (SftpException e1) {
                e1.printStackTrace();
            }
            System.out.println("正在复制文件:" + file.getAbsolutePath());
            InputStream instream = null;
            OutputStream outstream = null;
            try {
                outstream = sftp.put(file.getName());
                instream = new FileInputStream(file);

                byte b[] = new byte[1024];
                int n;
                try {
                    while ((n = instream.read(b)) != -1) {
                        outstream.write(b, 0, n);
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }

            } catch (SftpException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                try {
                    outstream.flush();
                    outstream.close();
                    instream.close();

                } catch (Exception e2) {
                    e2.printStackTrace();
                }
            }
        }
    }

    /**
     * @param directory    SFTP服务器的文件路径
     * @param downloadFile SFTP服务器上的文件名
     * @param saveFile     保存到本地路径
     * @param username
     * @param password
     * @param host
     * @param port
     */
    public static void downloadFile(String directory, String downloadFile, String saveFile, String username, String password, String host, Integer port) {
        ChannelSftp sftp = null;
        try {
            JSch jsch = new JSch();
            //获取session  账号-ip-端口
            com.jcraft.jsch.Session sshSession = jsch.getSession(username, host, port);
            //添加密码
            sshSession.setPassword(password);
            Properties sshConfig = new Properties();
            //严格主机密钥检查
            sshConfig.put("StrictHostKeyChecking", "no");
            sshSession.setConfig(sshConfig);
            //开启session连接
            sshSession.connect();
            //获取sftp通道
            sftp = (ChannelSftp) sshSession.openChannel("sftp");
            //开启
            sftp.connect();
            if (directory != null && !"".equals(directory)) {
                sftp.cd(directory);
            }
            FileOutputStream output = new FileOutputStream(new File(saveFile));
            sftp.get(downloadFile, output);
            output.close();
            sftp.disconnect();
            sshSession.disconnect();
            System.out.println("================下载成功！==================");
        } catch (SftpException | FileNotFoundException | JSchException e) {
            logger.error("SFTP文件下载异常！", e);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        String source = "D:\\test\\1";
        String windowsDest = "/";
        String linuxDest = "/home/sftp";
        uploadFile(source ,windowsDest,"administrator" , "123123","192.168.1.69" ,5555 );
        uploadFile(source ,linuxDest,"root" , "123123","192.168.1.67" ,22 );
    }



}