package com.chrtc.common.util;
import com.jcraft.jsch.ChannelExec;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Session;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;

/**
 * @create 2021-12-17 18:11
 * @desc JSch工具類
 **/
public class JSchUtils {

    private static JSch jSch = null;
    private static Session session;

    /***
     * @Author xhh
     * @Description 獲取session
     * @GreateTime 2021/12/17 18:16
     * @Params []
     * @return
     */
    public static Session getSession() throws JSchException {
        //創(chuàng)建JSch對(duì)象
        if (null == jSch) {
            synchronized (JSch.class) {
                if (jSch == null) {
                    jSch = new JSch();
                }

            }
        }
            //"~/.ssh/id_rsa"
            //檢查本地是否有SSH Key存在
            if (Files.exists(Paths.get("1111aaaa"))) {
                //設(shè)置私鑰
                jSch.addIdentity("1111aaaa", "xhh");
            }
            //獲取session
            if (null == session) {
                synchronized (Session.class) {
                    if (session == null) {
                        session = jSch.getSession("root", "192.168.21.11", 22);
                    }
                }
            }
                session.setPassword("root");
                session.setConfig("StrictHostKeyChecking", "no");
                return session;
            }
            /***
             * @Author xhh
             * @Description 執(zhí)行shell command命令
             * @GreateTime 2021/12/17 18:41
             * @Params [session, command]
             * @return
             */
            public static List<String> remoteExecute (Session session, String command) throws JSchException {
                List<String> resultLines = new ArrayList<>();
                ChannelExec channel = null;
                try {
                    //創(chuàng)建通道執(zhí)行器
                    channel = (ChannelExec) session.openChannel("exec");
                    //執(zhí)行命令
                    channel.setCommand(command);
                    //或缺輸入流
                    InputStream input = channel.getInputStream();
                    //連接時(shí)間
                    channel.connect(10000);
                    //讀取流
                    try {
                        BufferedReader inputReader = new BufferedReader(new InputStreamReader(input));
                        String inputLine = null;
                        while ((inputLine = inputReader.readLine()) != null) {
                            resultLines.add(inputLine);
                        }
                    } finally {
                        if (input != null) {
                            try {
                                //關(guān)流
                                input.close();
                            } catch (Exception e) {
                                e.printStackTrace();
                            }
                        }
                    }
                } catch (IOException e) {
                    e.printStackTrace();

                } finally {
                    if (channel != null) {
                        try {
                            channel.disconnect();
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                    }
                }
                return resultLines;
            }
        }

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