ftp 工具类

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import com.jcraft.jsch.*;
import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
 
import java.io.*;
import java.util.Properties;
import java.util.Vector;
 
public class SftpUtils {
 
    private transient Logger log = LoggerFactory.getLogger(this.getClass());
 
    private ChannelSftp sftp;
 
    private Session session;
    /** SFTP 登录用户名*/
    private String username;
    /** SFTP 登录密码*/
    private String password;
    /** 私钥 */
    private String privateKey;
    /** SFTP 服务器地址IP地址*/
    private String host;
    /** SFTP 端口*/
    private int port;
 
 
    /**
     * 构造基于密码认证的sftp对象
     */
    public SftpUtils(String username, String password, String host, int port) {
        this.username = username;
        this.password = password;
        this.host = host;
        this.port = port;
    }
 
    /**
     * 构造基于秘钥认证的sftp对象
     */
    public SftpUtils(String username, String host, int port, String privateKey) {
        this.username = username;
        this.host = host;
        this.port = port;
        this.privateKey = privateKey;
    }
 
    public SftpUtils(){}
 
 
    /**
     * 连接sftp服务器
     */
    public void login(){
        try {
            JSch jsch = new JSch();
            if (privateKey != null) {
                jsch.addIdentity(privateKey);// 设置私钥
            }
 
            session = jsch.getSession(username, host, port);
 
            if (password != null) {
                session.setPassword(password);
            }
            Properties config = new Properties();
            config.put("StrictHostKeyChecking", "no");
 
            session.setConfig(config);
            session.connect();
 
            Channel channel = session.openChannel("sftp");
            channel.connect();
 
            sftp = (ChannelSftp) channel;
        } catch (JSchException e) {
            log.error("连接ftp服务器错误",e);
        }
    }
 
    /**
     * 关闭连接 server
     */
    public void logout(){
        if (sftp != null) {
            if (sftp.isConnected()) {
                sftp.disconnect();
            }
        }
        if (session != null) {
            if (session.isConnected()) {
                session.disconnect();
            }
        }
    }
 
 
    /**
     * 将输入流的数据上传到sftp作为文件。文件完整路径=basePath+directory
     * @param basePath  服务器的基础路径
     * @param directory  上传到该目录
     * @param sftpFileName  sftp端文件名
     * @param input   输入流
     */
    public void upload(String basePath,String directory, String sftpFileName, InputStream input) throws SftpException{
        try {
            sftp.cd(sftp.getHome());
            sftp.cd(basePath);
            sftp.cd(directory);
        } catch (SftpException e) {
            //目录不存在，则创建文件夹
            String [] dirs=directory.split("/");
            String tempPath=basePath;
            for(String dir:dirs){
                if(null== dir || "".equals(dir)) continue;
                tempPath+="/"+dir;
                try{
                    sftp.cd(sftp.getHome());
                    sftp.cd(tempPath);
                }catch(SftpException ex){
                    sftp.mkdir(tempPath);
                    sftp.cd(tempPath);
                }
            }
        }
        sftp.put(input, sftpFileName);  //上传文件
    }
 
 
    /**
     * 下载文件。
     * @param directory 下载目录
     * @param downloadFile 下载的文件
     * @param saveFile 存在本地的路径
     */
    public void download(String directory, String downloadFile, String saveFile) throws SftpException, FileNotFoundException {
        if (directory != null && !"".equals(directory)) {
            sftp.cd(sftp.getHome());
            sftp.cd(directory);
        }
        File file = new File(saveFile);
        sftp.get(downloadFile, new FileOutputStream(file));
    }
 
    /**
     * 下载文件
     * @param directory 下载目录
     * @param downloadFile 下载的文件名
     * @return 字节数组
     */
    public byte[] download(String directory, String downloadFile) throws SftpException, IOException {
        if (directory != null && !"".equals(directory)) {
            sftp.cd(sftp.getHome());
            sftp.cd(directory);
        }
        InputStream is = sftp.get(downloadFile);
 
        byte[] fileData = IOUtils.toByteArray(is);
 
        return fileData;
    }
 
 
    public InputStream downloadFileAsInputStream(String directory, String downloadFile) throws SftpException, IOException {
        if (directory != null && !"".equals(directory)) {
            sftp.cd(sftp.getHome());
            sftp.cd(directory);
        }
        InputStream is = sftp.get(downloadFile);
        return is;
    }
 
 
    /**
     * 删除文件
     * @param directory 要删除文件所在目录
     * @param deleteFile 要删除的文件
     */
    public void delete(String directory, String deleteFile) throws SftpException{
        sftp.cd(sftp.getHome());
        sftp.cd(directory);
        sftp.rm(deleteFile);
    }
 
 
    /**
     * 列出目录下的文件
     * @param directory 要列出的目录
     */
    public Vector<?> listFiles(String directory) throws SftpException {
        sftp.cd(sftp.getHome());
        return sftp.ls(directory);
    }
 
    //上传文件测试
    public static void main(String[] args) throws Exception {
        SftpUtils sftp = new SftpUtils("ftpuser", "password", "127.0.0.1", 5222);
        sftp.login();
//        File file = new File("D:\\1.jpg");
//        InputStream is = new FileInputStream(file);
//
//       // sftp.upload("基础路径","文件路径", "test_1.jpg", is);
 
       // sftp.download("nginx-1.15.8/conf","nginx.conf","d:\\nginx.conf");
        Vector v = sftp.listFiles(".");
        System.out.println(v.size());
        v.stream().forEach(System.out::println);
        sftp.logout();
    }
 
}