Java SFTP辅助类

1、Maven依赖

        <dependency>
            <groupId>com.jcraft</groupId>
            <artifactId>jsch</artifactId>
            <version>0.1.54</version>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-core</artifactId>
            <version>2.9.2</version>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-core</artifactId>
            <version>2.9.2</version>
        </dependency>
        <dependency>
            <groupId>javax.validation</groupId>
            <artifactId>validation-api</artifactId>
            <version>2.0.1.Final</version>
        </dependency>

2、创建SFTPUtils类

package com.wap.common;

import com.jcraft.jsch.*;
import com.jcraft.jsch.ChannelSftp.LsEntry;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Properties;
import java.util.Vector;

public class SFTPUtils {
    private static final Logger LOG = LogManager.getLogger(SFTPUtils.class);


    //服务器地址
    private static String host = "192.168.1.1";
    //服务器端口
    private static int port = "22";
    //服务器账号
    private static String username = "test";
    //服务器密码
    private static String password = "test";

    public static String directory="/file/upload";

    private static ChannelSftp sftp;

    private static SFTPUtils instance = null;

    private SFTPUtils() {
    }

    public SFTPUtils(String directory) {
       // this.directory = directory;
    }

    public static SFTPUtils getInstance() {
        if (instance == null) {
            if (instance == null) {
                instance = new SFTPUtils();

                sftp = instance.connect(host, port, username, password);   //获取连接
            }
        }
        return instance;
    }

    /**
     * 连接sftp服务器
     *
     * @param host     主机
     * @param port     端口
     * @param username 用户名
     * @param password 密码
     * @return
     */
    public ChannelSftp connect(String host, int port, String username, String password) {
        ChannelSftp sftp = null;
        try {
            JSch jsch = new JSch();
            jsch.getSession(username, host, port);
            Session sshSession = jsch.getSession(username, host, port);
            sshSession.setPassword(password);
            Properties sshConfig = new Properties();
            sshConfig.put("StrictHostKeyChecking", "no");
            sshSession.setConfig(sshConfig);
            sshSession.connect();
            LOG.info("SFTP Session connected.");
            Channel channel = sshSession.openChannel("sftp");
            channel.connect();
            sftp = (ChannelSftp) channel;
            LOG.info("Connected to " + host);
        } catch (Exception e) {
            LOG.error(e.getMessage());
        }
        return sftp;
    }

    /**
     * 上传文件
     *String directory,
     * @paramdirectory  上传的目录
     * @param uploadFile 要上传的文件
     */
    public boolean upload( String uploadFile) {
        try {
            sftp.cd(directory);
            File file = new File(uploadFile);
            FileInputStream fileInputStream = new FileInputStream(file);
            sftp.put(fileInputStream, file.getName(),ChannelSftp.OVERWRITE);
            fileInputStream.close();
            return true;
        } catch (Exception e) {
            LOG.error(e.getMessage());
            return false;
        }
    }

    /**
     * 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 File download(String directory, String downloadFile, String saveFile) {
        try {
            sftp.cd(directory);
            File file = new File(saveFile);
            FileOutputStream fileOutputStream = new FileOutputStream(file);
            sftp.get(downloadFile, fileOutputStream);
            fileOutputStream.close();
            return file;
        } catch (Exception e) {
            LOG.error(e.getMessage());
            return null;
        }
    }

    /**
     * 下载文件
     *
     * @param downloadFilePath 下载的文件完整目录
     * @param saveFile         存在本地的路径
     */
    public File download(String downloadFilePath, String saveFile) {
        try {
            int i = downloadFilePath.lastIndexOf('/');
            if (i == -1)
                return null;
            sftp.cd(downloadFilePath.substring(0, i));
            File file = new File(saveFile);
            FileOutputStream fileOutputStream = new FileOutputStream(file);
            sftp.get(downloadFilePath.substring(i + 1), fileOutputStream);
            fileOutputStream.close();
            return file;
        } catch (Exception e) {
            LOG.error(e.getMessage());
            return null;
        }
    }

    /**
     * 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) {
        try {
            sftp.cd(directory);
            sftp.rm(deleteFile);
        } catch (Exception e) {
            LOG.error(e.getMessage());
        }
    }

    public void disconnect() {
        try {
            sftp.getSession().disconnect();
        } catch (JSchException e) {
            LOG.error(e.getMessage());
        }
        sftp.quit();
        sftp.disconnect();
    }

    /**
     * 列出目录下的文件
     *
     * @param directory 要列出的目录
     * @throws SftpException
     */
    public Vector<ChannelSftp.LsEntry> listFiles(String directory) throws SftpException {
        return sftp.ls(directory);
    }





    public static void main(String[] args) throws IOException {
        SFTPUtils sf = SFTPUtils.getInstance();
//        sf.upload(directory, "C:\Users\hp\Desktop\123456.png");    //上传文件

//        sf.download(directory, "2.png", "C:\Users\hp\Desktop\1212.png");
        File download = sf.download("/home/1.png", "C:\Users\hp\Desktop\122221.png");

//        sf.delete(directory, deleteFile); //删除文件

        Vector<ChannelSftp.LsEntry> files = null;        //查看文件列表
        try {
            files = sf.listFiles(directory);
        } catch (SftpException e) {
            e.printStackTrace();
        }
        for (LsEntry file : files) {
            System.out.println("###	" + file.getFilename());
        }
        sf.disconnect();
    }
}