java操作远程Linux服务器的工具类：如获取linux服务器上的文件等操作

导入pom依赖

<dependency>
    <groupId>com.jcraftgroupId>
    <artifactId>jschartifactId>
    <version>0.1.54version>
dependency>

工具类

import com.jcraft.jsch.*;

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

public class SFTPUtil {

    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 SFTPUtil(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 SFTPUtil(String username, String host, int port, String privateKey) {
        this.username = username;
        this.host = host;
        this.port = port;
        this.privateKey = privateKey;
    }

    public SFTPUtil() { }


    /**
     * 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) {
            e.printStackTrace();
        }
    }

    /**
     * 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 directory    上传到该目录
     * @param sftpFileName sftp端文件名
     */
    public boolean upload(String directory, String sftpFileName, InputStream input) throws SftpException {
        try {
            if (directory != null && !"".equals(directory)) {
                sftp.cd(directory);
            }
            sftp.put(input, sftpFileName);  //上传文件
            return true;
        } catch (SftpException e) {
            return false;
        }
    }

    public void cd(String directory) throws SftpException {
        if (directory != null && !"".equals(directory) && !"/".equals(directory)) {
            sftp.cd(directory);
        }

    }


    /**
     * 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) {
        System.out.println("download:" + directory + " downloadFile:" + downloadFile + " saveFile:" + saveFile);

        File file = null;
        try {
            if (directory != null && !"".equals(directory)) {
                sftp.cd(directory);
            }
            file = new File(saveFile);
            sftp.get(downloadFile, new FileOutputStream(file));
        } catch (SftpException | FileNotFoundException e) {
            e.printStackTrace();
            if (file != null) {
                file.delete();
            }
        }

    }


    /**
     * 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 {
        if (directory != null && !"".equals(directory)) {
            sftp.cd(directory);
        }
        sftp.rm(deleteFile);
    }


    /**
     * 列出目录下的文件
     *
     * @param directory 要列出的目录
     */
    public List<String> listFiles(String directory) throws SftpException {
        Vector<?> objects = sftp.ls(directory);
        List<String> list = new ArrayList<>();
        for (Object s : objects){
            String x = s.toString();
            String[] s1 = x.split(" ");
            System.out.println(s1[s1.length -1]);
        }
        return list;
    }

    public boolean isExistsFile(String directory, String fileName) {

        List<String> findFileList = new ArrayList<>();
        ChannelSftp.LsEntrySelector selector = lsEntry -> {
            if (lsEntry.getFilename().equals(fileName)) {
                findFileList.add(fileName);
            }
            return 0;
        };

        try {
            sftp.ls(directory, selector);
        } catch (SftpException e) {
            e.printStackTrace();
        }

        return findFileList.size() > 0;
    }
}