centos搭建sftp服务器（Linux云服务器搭建SFTP服务器图片服务器的操作）

<dependency>
    <groupId>com.jcraft</groupId>
    <artifactId>jsch</artifactId>
    <version>0.1.49</version>
</dependency>

public class SFTPInfo {
    public static final String SFTP_REQ_HOST = "000.00.00.00";        //云服务器ip
    public static final String SFTP_REQ_USERNAME = "00t";           // 用户名
    public static final String SFTP_REQ_PASSWORD = "00";      //密码
    public static final int SFTP_DEFAULT_PORT = 22;                  //端口
   public static String basePath="/usr/games/images";               // 文件在服务器端保存的主目录 （文件上传路径这是）
    public  static String baseUrl="https://##.##.com/images";   //线上域名访问指定nginx访问路径 （这里路径很关键）
} 

import java.io.InputStream;
import java.util.Properties;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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 SftpUtils {
    private static final Logger LOG = LoggerFactory.getLogger(SftpUtils.class);
 
    /**
     * 参考实例
     *
     * @param args
     */
    public Channel getChannel(Session session) {
        Channel channel = null;
        try {
            channel = session.openChannel("sftp");
            channel.connect();
            LOG.info("get Channel success!");
        } catch (JSchException e) {
            LOG.info("get Channel fail!", e);
        }
        return channel;
    }
 
    public Session getSession(String host, int port, String username,
                              final String password) {
        Session session = null;
        try {
            JSch jsch = new JSch();
            jsch.getSession(username, host, port);
            session = jsch.getSession(username, host, port);
            session.setPassword(password);
            Properties sshConfig = new Properties();
            sshConfig.put("StrictHostKeyChecking", "no");
            session.setConfig(sshConfig);
            session.connect();
            LOG.info("Session connected!");
        } catch (JSchException e) {
            LOG.info("get Channel failed!", e);
        }
        return session;
    }
 
    /**
     * 创建文件夹
     *
     * @param sftp
     * @param dir
     *            文件夹名称
     */
    public void mkdir(ChannelSftp sftp, String dir) {
        try {
            sftp.mkdir(dir);
            System.out.println("创建文件夹成功！");
        } catch (SftpException e) {
            System.out.println("创建文件夹失败！");
            e.printStackTrace();
        }
    }
 
    /**
     * @param sftp
     * @param dir
     *            上传目录
     * @param file
     *            上传文件
     * @return
     */
    public Boolean uploadFile(ChannelSftp sftp, String dir, InputStream  file,String fileName) {
        Boolean flag = false;
        try {
            sftp.cd(dir);
            if (file != null) {
                sftp.put(file, fileName);
                flag=true;
                return flag;
            } else {
                flag=false;
                return flag;
            }
        } catch (Exception e) {
 
            flag=false;
            return flag;
        }
    }
 
    /**
     * 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
     * @param sftp
     */
    public String download(String directory, String downloadFile,
                           String saveFile, ChannelSftp sftp) {
        String result = "";
        try {
            sftp.cd(directory);
            sftp.get(downloadFile, saveFile);
            result = "下载成功！";
        } catch (Exception e) {
            result = "下载失败！";
            LOG.info("下载失败！", e);
            ;
        }
        return result;
    }
 
    /**
     * 删除文件
     *
     * @param directory
     *            要删除文件所在目录
     * @param deleteFile
     *            要删除的文件
     * @param sftp
     */
    public String delete(String directory, String deleteFile, ChannelSftp sftp) {
        String result = "";
        try {
            sftp.cd(directory);
            sftp.rm(deleteFile);
            result = "删除成功！";
        } catch (Exception e) {
            result = "删除失败！";
            LOG.info("删除失败！", e);
        }
        return result;
    }
 
    private void closeChannel(Channel channel) {
        if (channel != null) {
            if (channel.isConnected()) {
                channel.disconnect();
            }
        }
    }
 
    private void closeSession(Session session) {
        if (session != null) {
            if (session.isConnected()) {
                session.disconnect();
            }
        }
    }
 
    public void closeAll(ChannelSftp sftp, Channel channel, Session session) {
        try {
            closeChannel(sftp);
            closeChannel(channel);
            closeSession(session);
        } catch (Exception e) {
            LOG.info("closeAll", e);
        }
    }
}

import java.util.Random; 
public class IDUtils {
 
    /**
     * 生成随机图片名
     */
    public static String genImageName() {
        //取当前时间的长整形值包含毫秒
        long millis = System.currentTimeMillis();       
        //加上三位随机数
        Random random = new Random();
        int end3 = random.nextInt(999);
        //如果不足三位前面补0
        String str = millis + String.format("%03d", end3);        
        return str;
    }
}

@Log("网站案例上传信息")
@ResponseBody
@PostMapping("/upload")
@RequiresPermissions("common:cases:upload")
R upload(@RequestParam("file") MultipartFile file,@RequestParam("ctitle") String ctitle, @RequestParam("cmessage") String  cmessage,
       @RequestParam("casetroduction") String  casetroduction,@RequestParam("strdate") Date  strdate,@RequestParam("stpdate") Date  stpdate,
       @RequestParam("credate") Date  credate,HttpServletRequest request) throws ParseException, IOException {
   String oldName = file.getOriginalFilename();
   //使用IDUtils工具类生成新的文件名，新文件名 = newName + 文件后缀
   String newName = IDUtils.genImageName();
   newName = newName + oldName.substring(oldName.lastIndexOf("."));
   SftpUtils ft = new SftpUtils();
   //通过SFtoInfo  参数连接传入参数即可
   Session s = ft.getSession(SFTPInfo.SFTP_REQ_HOST,SFTPInfo.SFTP_DEFAULT_PORT,      SFTPInfo.SFTP_REQ_USERNAME,SFTPInfo.SFTP_REQ_PASSWORD);
   Channel channel = ft.getChannel(s);
   ChannelSftp sftp = (ChannelSftp)channel;
   Boolean upload = ft.uploadFile(sftp,SFTPInfo.basePath, file.getInputStream(),newName);
   if(upload){
      //上传成功关闭信息
      ft.closeAll(sftp, channel, s); //关闭连接
      CasesDO cases=new CasesDO();
      cases.setCtitle(ctitle);
        // 这里很重要 这是访问路径写入到数据库的路径加线上域名访问图片的路径，博主这里加了ssl证书
      //     https://**.**.com/images   newName=文件名图片
      cases.setCaseimg(SFTPInfo.baseUrl + "/" + newName);
      cases.setCasetroduction(casetroduction);
      cases.setStpdate(stpdate);
      cases.setCredate(credate);
      cases.setStrdate(strdate);
      cases.setCmessage(cmessage);
      if (casesService.save(cases) > 0) {
         return R.ok("上传成功");
      }
               }else {
      return R.error("上传error");
   }
   return R.error();
}

var clipboard = new Clipboard('button.copy', {
    text: function (trigger) {
        layer.msg('文件路径已复制到粘贴板');
        return $(trigger).attr('url');
    }
});
layui.use('upload', function () {
    var upload = layui.upload;
    //执行实例
    upload.render({
        elem: '#test1', //绑定元素
        url: '/common/cases/upload', //上传接口
        size: 100000,
        // auto: false,
        accept: 'file',
        //bindAction: '#submits',
        before: function (obj) {
            //obj参数包含的信息，跟 choose回调完全一致。其中输入向后台传输的参数
            layer.load();
            this.data = {
                ctitle: $('#ctitle').val(),
                cmessage: $('#cmessage').val()                    ,
                casetroduction: $('#casetroduction').val()
                ,strdate: $('#strdate').val()
                ,stpdate: $('#stpdate').val()
                ,credate: $('#credate').val(),
            };
        },
        done: function (r) {
            parent.layer.msg(r.msg);
            parent.reLoad();
            var index = parent.layer.getFrameIndex(window.name); // 获取窗口索引
            parent.layer.close(index);
        },
        error: function (r) {
            layer.msg(r.msg);
        }
    });
});