Java使用Jcdh连接服务器（采用密码登陆方式）

工具类：

package com.dpi.util;

import com.jcraft.jsch.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.*;
import java.util.List;
import java.util.Properties;
import java.util.Vector;

public class SftpUtil {

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

    public static Session getSession(String host, int port, String username, String password) {
        Session sshSession = null;
        try {
            JSch jsch = new JSch();
            //添加私钥路径
//            jsch.addIdentity(priKey_base_path);
            jsch.getSession(username, host, port);
            sshSession = jsch.getSession(username, host, port);
            sshSession.setPassword(password);
            Properties sshConfig = new Properties();
            sshConfig.put("StrictHostKeyChecking", "no");
            sshSession.setConfig(sshConfig);
            sshSession.connect();
            log.info("sshSession连接成功！");
        } catch (Exception e) {
            log.info("sshSession连接异常，"+e.toString());
            e.printStackTrace();
        }
        return sshSession;
    }

    public static ChannelSftp connectSftp(Session session) {
        ChannelSftp sftp = null;
        try {
            log.info("Opening Channel.");
            Channel channel = session.openChannel("sftp");
            channel.connect();
            sftp = (ChannelSftp) channel;
        } catch (Exception e) {
            log.info("Sftp连接异常，"+e.toString());
            e.printStackTrace();
            sftp = null;
        }
        return sftp;
    }

    /**
     * @Author lizhm
     * @Description 上传文件
     * @Date 11:36 2021/8/31
     * @Param [directory, uploadFile, sftp]
     * @return void
     * @History: <author>  <time>  <version>  <desc>
     **/
    public static void upload(String fileDir, String uploadFile, ChannelSftp sftp) {
        try {
            if(!isDirExist(sftp, fileDir)){
                sftp.mkdir(fileDir);
            }
            sftp.cd(fileDir);
            File file = new File(uploadFile);
            if(!file.exists()){
                log.info("未找到待分发的IP配置文件！");
                return;
            }
            FileInputStream fileInputStream = new FileInputStream(file);
            sftp.put(fileInputStream, file.getName());
            fileInputStream.close();
        } catch (Exception e) {
            log.info("分发IP配置文件异常，"+e.toString());
            e.printStackTrace();
        }
    }

    public static Vector listFiles(String directory, ChannelSftp sftp)throws SftpException {
        return sftp.ls(directory);
    }

    public void renameFile(String directory, String oldname, String newname,ChannelSftp sftp) {
        try {
            sftp.cd(directory);
            sftp.rename(oldname, newname);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void deleteAllTxtBySftp(String fileDir, ChannelSftp sftp) {
        try {
            if(!isDirExist(sftp, fileDir)){
                log.info("源服务器的IP配置文件路径不存在！");
                return ;
            }
            sftp.cd(fileDir);
            //  获取目录下面所有文件
            Vector nVector = sftp.ls(fileDir);
            // 循环遍历文件
            for (int i = 0; i < nVector.size(); i++) {
                String nFileName = nVector.get(i).toString().substring(56, nVector.get(i).toString().length());
                if (nFileName.toLowerCase().endsWith(".txt")) {
                    sftp.rm(nFileName);
                }
            }
        } catch (Exception e) {
            log.info("删除源IP配置文件失败，"+e.toString());
            e.printStackTrace();
        }
    }

    public static List<String> downloadAllTxt(String viDirectory, ChannelSftp sftp, String viSaveDir) {
        List<String> nFileNameList = null;
        try {
            if(!isDirExist(sftp, viDirectory)){
                log.info("源服务器的IP配置文件路径不存在！");
                return nFileNameList;
            }
            // 获取目录下面所有文件
            Vector nVector = sftp.ls(viDirectory);
            // 循环遍历文件
            for (int i = 0; i < nVector.size(); i++) {
                // 进入服务器文件夹
                sftp.cd(viDirectory);
                // 实例化文件对象
                String nFileName = nVector.get(i).toString().substring(56, nVector.get(i).toString().length());
                if (!nFileName.toLowerCase().endsWith(".txt")) {
                    continue;
                }
                File nFile = new File(viSaveDir + File.separator + nFileName);
                // 下载文件
                FileOutputStream fileOutputStream = new FileOutputStream(nFile);
                sftp.get(nFileName, fileOutputStream);
                fileOutputStream.close();
            }
        } catch (Exception e) {
            log.info("源服务器IP配置文件下载异常，"+e.toString());
            e.printStackTrace();
        }
        return nFileNameList;
    }

    public static boolean isDirExist(ChannelSftp channelSftp, String fileDir) {
        try {
            SftpATTRS sftpATTRS = channelSftp.lstat(fileDir);
            return sftpATTRS.isDir();
        } catch (SftpException e) {
            return false;
        }
    }

    public static void mkDir(ChannelSftp sftp, String fileDir) {
        try {
            if (!isDirExist(sftp, fileDir)) {
                sftp.mkdir(fileDir);
            }
        } catch (Exception e) {
            log.info("创建目录异常，"+e.toString());
            e.printStackTrace();
        }
    }

    public static void bakTxt(String fromDir, String toDir, ChannelSftp sftp, Session session) {
        try {
            if(!isDirExist(sftp, fromDir)){
                log.info("源服务器的IP配置文件路径不存在！");
                return ;
            }
            if(!isDirExist(sftp, toDir)){
                sftp.mkdir(toDir);
            }
            String cmd = "cp -R " + fromDir + "/*.[T,t][X,x][T,t] " + toDir;
            execCommand(session, cmd);
        } catch (Exception e) {
            log.info("备份源IP配置文件失败，"+e.toString());
            e.printStackTrace();
        }
    }

   
    public static void deleteAllTxt(String fileDir, Session session) {
        try {
            String cmd = "rm -rf " + fileDir + "/*.[T,t][X,x][T,t] ";
            execCommand(session, cmd);
        } catch (Exception e) {
            log.info("删除源IP配置文件失败，"+e.toString());
            e.printStackTrace();
        }
    }

    public static void moveAllTxt(String fromDir, String toDir, ChannelSftp sftp, Session session) {
        try {
            if(!isDirExist(sftp, fromDir)){
                log.info("源服务器的IP配置文件路径不存在！");
                return ;
            }
            if(!isDirExist(sftp, toDir)){
                sftp.mkdir(toDir);
            }
            String cmd = "mv -f " + fromDir + "/*.[T,t][X,x][T,t] " + toDir;
            execCommand(session, cmd);
        } catch (Exception e) {
            log.info("备份源IP配置文件失败，"+e.toString());
            e.printStackTrace();
        }
    }

    public static String execCommand(Session session, String command){
        try{
            ChannelExec channelExec = (ChannelExec) session.openChannel("exec");
            InputStream in = channelExec.getInputStream();
            channelExec.setCommand(command);
            channelExec.setErrStream(System.err);
            channelExec.connect();
//            out = IOUtils.toString(in, "UTF-8");
            in.close();
            channelExec.disconnect();
            session.disconnect();
        }catch (Exception e){
            log.info(e.toString());
            e.printStackTrace();
        }
        return "";
    }

    public static void close(ChannelSftp sftp, Session session) {
        if (sftp != null) {
            sftp.disconnect();
            sftp.exit();
        }
        if (session != null) {
            session.disconnect();
        }
    }

    public static void closeChannel(ChannelSftp sftp) {
        if (sftp != null) {
            sftp.disconnect();
            sftp.exit();
        }
    }

}