// jsch包
    implementation 'com.jcraft:jsch:0.1.55'

package com.cc.jschdemo.utils;
import com.jcraft.jsch.*;
import lombok.Data;
import org.apache.commons.lang3.StringUtils;
import org.springframework.http.HttpHeaders;
import org.springframework.stereotype.Component;
import javax.annotation.PreDestroy;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.*;
/**
 * <p>JSch工具類</p>
 * <li>交給spring管理：每個使用的地方都是單例，都是單獨的這個類。（new 也可以）</li>
 *
 * <li>所有方法都沒有關(guān)閉（連接、會話），需要使用方自己關(guān)閉</li>
 *
 * @author CC
 * @since 2023/11/8
 */
@Data
@Component
public class JSchUtil {
    //緩存session會話
    private Session session;
    //通道：執(zhí)行命令
    private ChannelExec channelExec;
    //通道：SFTP
    private ChannelSftp channelSftp;
    //通道：執(zhí)行復(fù)雜Shell命令
    private ChannelShell channelShell;
    //登陸Linux服務(wù)器
    public void loginLinux(String username, String password, String host, Integer port) {
        try {
            //每次都會重新初始化session
            if (Objects.isNull(session) || !session.isConnected()) {
                JSch jsch = new JSch();
                session = jsch.getSession(username, host, port);
                session.setPassword(password);
                // 配置Session參數(shù)
                Properties config = new Properties();
                // 不進行公鑰的檢查
                config.put("StrictHostKeyChecking", "no");
                session.setConfig(config);
                // 設(shè)置連接超時時間（s/秒）
                session.setTimeout(300);
            }
            if (!session.isConnected()) {
                // 連接到遠程服務(wù)器
                session.connect();
            }
        }catch(Exception e){
            throw new RuntimeException("連接Linux失?。? + e.getMessage());
        }
    }
    //執(zhí)行命令：可以多次執(zhí)行，然后必須調(diào)用關(guān)閉接口
    public String executeCommand(String command) {
        StringBuilder result = new StringBuilder();
        BufferedReader buf = null;
        try {
            //每次執(zhí)行都創(chuàng)建新的通道
            channelExec = (ChannelExec) session.openChannel("exec");
            channelExec.setCommand(command);
            //正確的流中沒有數(shù)據(jù)就走錯誤流中去拿。
            InputStream in = channelExec.getInputStream();
            InputStream errStream = channelExec.getErrStream();
            channelExec.connect();
            buf = new BufferedReader(new InputStreamReader(in));
            String msg;
            while ((msg = buf.readLine()) != null) {
                result.append(msg);
            }
            if (StringUtils.isBlank(result.toString())) {
                buf = new BufferedReader(new InputStreamReader(errStream));
                String msgErr;
                while ((msgErr = buf.readLine()) != null) {
                    result.append(msgErr);
                }
            }
        }catch(Exception e){
            throw new RuntimeException("關(guān)閉連接失?。▓?zhí)行命令）：" + e.getMessage());
        }finally {
            if (Objects.nonNull(buf)) {
                try {
                    buf.close();
                }catch(Exception e){
                    e.printStackTrace();
                }
            }
        }
        return result.toString();
    }
    /**
     * 執(zhí)行復(fù)雜shell命令
     *
     * @param cmds 多條命令
     * @return 執(zhí)行結(jié)果
     * @throws Exception 連接異常
     */
    public String execCmdByShell(List<String> cmds) {
        String result = "";
        try {
            channelShell = (ChannelShell) session.openChannel("shell");
            InputStream inputStream = channelShell.getInputStream();
            channelShell.setPty(true);
            channelShell.connect();
            OutputStream outputStream = channelShell.getOutputStream();
            PrintWriter printWriter = new PrintWriter(outputStream);
            for (String cmd : cmds) {
                printWriter.println(cmd);
            }
            printWriter.flush();
            byte[] tmp = new byte[1024];
            while (true) {
                while (inputStream.available() > 0) {
                    int i = inputStream.read(tmp, 0, 1024);
                    if (i < 0) {
                        break;
                    }
                    String s = new String(tmp, 0, i);
                    if (s.contains("--More--")) {
                        outputStream.write((" ").getBytes());
                        outputStream.flush();
                    }
                    System.out.println(s);
                }
                if (channelShell.isClosed()) {
                    System.out.println("exit-status:" + channelShell.getExitStatus());
                    break;
                }
                //間隔1s后再執(zhí)行
                try {
                    Thread.sleep(1000);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
            outputStream.close();
            inputStream.close();
        }catch(Exception e){
            e.printStackTrace();
        }
        return result;
    }
    //下載除了云服務(wù)器的文件（你自己的服務(wù)器）：因為云服務(wù)器，像阿里云服務(wù)器下載文件好像是一段一段給你的，不是一起給你。
    public void downloadOtherFile(String remoteFileAbsolutePath, String fileName, HttpServletResponse response) {
        try {
            channelSftp = (ChannelSftp) session.openChannel("sftp");
            channelSftp.connect();
            //獲取輸入流
            InputStream inputStream = channelSftp.get(remoteFileAbsolutePath);
            //直接下載到本地文件
//            channelSftp.get(remoteFileAbsolutePath, "D:\\Develop\\Test\\studio-3t-x64.zip");
            response.setCharacterEncoding(StandardCharsets.UTF_8.name());
            response.setContentType("application/octet-stream;charset=".concat(StandardCharsets.UTF_8.name()));
            response.setHeader(HttpHeaders.ACCESS_CONTROL_EXPOSE_HEADERS, HttpHeaders.CONTENT_DISPOSITION);
            response.setHeader(HttpHeaders.CONTENT_DISPOSITION,
                    "attachment; filename=".concat(
                            URLEncoder.encode(fileName, StandardCharsets.UTF_8.name())
                    ));
            ServletOutputStream out = response.getOutputStream();
            // 從InputStream輸入流讀取數(shù)據(jù) 并寫入到ServletOutputStream輸出流
            byte[] buffer = new byte[4096];
            int bytesRead;
            while ((bytesRead = inputStream.read(buffer)) != -1) {
                out.write(buffer, 0, bytesRead);
            }
            out.flush();
            out.close();
        }catch(Exception e){
            throw new RuntimeException("關(guān)閉連接失?。ㄏ螺d文件）：" + e.getMessage());
        }
    }
    //下載云服務(wù)器的文件（因為云服務(wù)器傳文件是一段一段的，所以不能直接像操作我們的服務(wù)器一樣直接下載）（阿里云為例）
    public void downloadCloudServerFile(String remoteFileAbsolutePath, String fileName, HttpServletResponse response) {
        try {
            channelSftp = (ChannelSftp) session.openChannel("sftp");
            channelSftp.connect();
            //獲取輸入流
            InputStream inputStream = channelSftp.get(remoteFileAbsolutePath);
            //阿里云應(yīng)該是斷點續(xù)傳，后面研究……
        }catch(Exception e){
            throw new RuntimeException("關(guān)閉連接失?。ㄏ螺d文件）：" + e.getMessage());
        }
    }
    //ls命令：獲取文件夾的信息
    public String ls(String path){
        StringBuilder sb = new StringBuilder();
        try {
            channelSftp = (ChannelSftp) session.openChannel("sftp");
            channelSftp.connect();
            Vector ls = channelSftp.ls(path);
            Iterator iterator = ls.iterator();
            while (iterator.hasNext()) {
                Object next = iterator.next();
                System.out.println(next);
                sb.append(next);
            }
        } catch (Exception e){
            throw new RuntimeException(e.getMessage());
        }
        return sb.toString();
    }
    //關(guān)閉通道：釋放資源
    private void closeChannel(){
        //不為空，且已經(jīng)連接：關(guān)閉
        if (Objects.nonNull(channelExec)) {
            channelExec.disconnect();
        }
        if (Objects.nonNull(channelSftp)) {
            channelSftp.disconnect();
        }
        if (Objects.nonNull(channelShell)) {
            channelShell.disconnect();
        }
    }
    /** 關(guān)閉通道、關(guān)閉會話：釋放資源
     * spring銷毀前，關(guān)閉 所有會話 及 所有通道
     */
    @PreDestroy
    public void closeAll(){
        System.out.println("我被銷毀了。。。。。。。。。。。。。。。。。。。。。。");
        this.closeChannel();
        if (Objects.nonNull(session) && session.isConnected()) {
            session.disconnect();
        }
    }
}

package com.cc.jschdemo.web.controller;
import com.cc.jschdemo.utils.JSchUtil;
import com.jcraft.jsch.ChannelExec;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.Resource;
import java.io.InputStream;
import java.util.Arrays;
/**
 * <p></p>
 *
 * @author CC
 * @since 2023/11/8
 */
@RestController
@RequestMapping("/jsch")
public class JSchController {
    @Resource
    private JSchUtil jSchUtil;
    /** <p>執(zhí)行命令<p>
     **/
    @GetMapping
    public String executeCommand() {
        //登陸（默認只連接5分鐘，5分鐘后銷毀）
        jSchUtil.loginLinux("服務(wù)器賬號", "服務(wù)器密碼", "服務(wù)器IP", 服務(wù)器端口);
        //一、執(zhí)行命令
        String mkdir = jSchUtil.executeCommand("mkdir ccc");
        String docker = jSchUtil.executeCommand("docker");
        String dockerPs = jSchUtil.executeCommand("docker ps");
        System.out.println(mkdir);
        System.out.println(docker);
        System.out.println(dockerPs);
        //執(zhí)行完，關(guān)閉連接
        jSchUtil.closeAll();
        return docker;
    }
}

   /** <p>執(zhí)行命令<p>
     **/
    @PostMapping
    public String execCmdByShell() {
        //登陸（默認只連接5分鐘，5分鐘后銷毀）
        jSchUtil.loginLinux("服務(wù)器賬號", "服務(wù)器密碼", "服務(wù)器IP", 服務(wù)器端口);
        //二、執(zhí)行shell腳本（可以改造成傳入的shell腳步）
        jSchUtil.execCmdByShell(Arrays.asList("cd /", "ll" , "cd cc/", "mkdir ccccc222", "ll"));
        //執(zhí)行完，關(guān)閉連接
        jSchUtil.closeAll();
        return "docker";
    }

    //下載普通服務(wù)器的文件
    @PutMapping
    public void downloadOtherFile(HttpServletResponse response) {
        //登陸（默認只連接5分鐘，5分鐘后銷毀）
         jSchUtil.loginLinux("服務(wù)器賬號", "服務(wù)器密碼", "服務(wù)器IP", 服務(wù)器端口);
        //下載文件
        jSchUtil.downloadOtherFile(
                "/dev/libbb/studio-3t-x64.zip",
                "studio-3t-x64.zip",
                response
        );
        //執(zhí)行完，關(guān)閉連接
        jSchUtil.closeAll();
    }