如何实现一个Java程序中远程连接服务器执行一个脚本呢?有时候会有这种需求,如果非要去另外一个机器执行脚本,那么可以使用我下面这个工具类,已经封装好了,直接拿来用即可。

作者这里用Maven项目演示如何使用:
1)首先引入依赖:

        <!-- https://mvnrepository.com/artifact/ch.ethz.ganymed/ganymed-ssh2 -->
        <dependency>
            <groupId>ch.ethz.ganymed</groupId>
            <artifactId>ganymed-ssh2</artifactId>
            <version>build209</version>
        </dependency>

2)复制下面的工具类:RemoteShellExecutorUtils.java

/**
 * RemoteShellExecutorUtils
 *
 * @author lcry
 * @date 2019/08/24 18:00
 */

import ch.ethz.ssh2.ChannelCondition;
import ch.ethz.ssh2.Connection;
import ch.ethz.ssh2.Session;
import ch.ethz.ssh2.StreamGobbler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.Charset;

public class RemoteShellExecutorUtils {

    private static final Logger LOG = LoggerFactory.getLogger(RemoteShellExecutorUtils.class);

    private Connection conn;
    private String ip;
    private String usr;
    private String psword;
    private int port;
    private String charset = Charset.defaultCharset().toString();

    private static final int TIME_OUT = 1000 * 5 * 60;

    /**
     * 远程信息
     *
     * @param ip
     * @param usr
     * @param psword
     */
    public RemoteShellExecutorUtils(String ip, int port, String usr, String psword) {
        this.ip = ip;
        this.usr = usr;
        this.port = port;
        this.psword = psword;
    }

    /**
     * 远程登录
     *
     * @return
     * @throws IOException
     */
    private boolean login() throws IOException {
        conn = new Connection(ip, port);
        conn.connect();
        return conn.authenticateWithPassword(usr, psword);
    }

    /**
     * 执行命令
     *
     * @param cmds
     * @return
     * @throws IOException
     */
    public String exec(String cmds) throws IOException {
        InputStream stdOut = null;
        InputStream stdErr = null;
        String outStr = "";
        String outErr = "";
        int ret = -1;

        try {
            if (login()) {
                Session session = conn.openSession();
                session.execCommand(cmds);
                stdOut = new StreamGobbler(session.getStdout());
                outStr = processStream(stdOut, charset);
                LOG.info("执行日志:[INFO] outStr=" + outStr);
                stdErr = new StreamGobbler(session.getStderr());
                outErr = processStream(stdErr, charset);
                LOG.info("执行日志:[INFO] outErr=" + outErr);
                session.waitForCondition(ChannelCondition.EXIT_STATUS, TIME_OUT);
                ret = session.getExitStatus();

            } else {
                LOG.error("执行日志:[INFO] ssh2 login failure:" + ip);
                throw new IOException("SSH2_ERR");
            }

        } finally {
            if (conn != null) {
                conn.close();
            }
            if (stdOut != null) {
                stdOut.close();
            }
            if (stdErr != null) {
                stdErr.close();
            }
        }

        return outStr;
    }

    private String processStream(InputStream in, String charset) throws IOException {
        byte[] buf = new byte[1024];
        StringBuilder sb = new StringBuilder();
        while (in.read(buf) != -1) {
            sb.append(new String(buf, charset));
        }
        return sb.toString();
    }

    /**
     * 工具类
     *
     * @param usr      远程用户名
     * @param password 远程密码
     * @param serverIP 服务器IP
     * @param port     端口 默认 22
     * @param shPath   执行脚本
     * @return 返回执行信息
     */
    public static String ShellExecutor(String usr, String password, String serverIP, int port,
                                       String shPath) {

        RemoteShellExecutorUtils exe = new RemoteShellExecutorUtils(serverIP, port, usr, password);
        String outInf = "";
        try {
            String cmd = shPath;
            outInf = exe.exec(cmd);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return outInf;
    }

3)项目使用
RemoteShellExecutorUtils.ShellExecutor("root", "root", "192.168.254.140", 22, "/test.sh");
参数说明:
1.远程机器用户名
2.远程机器密码
3.远程机器IP
4.ssh端口号 默认22
5.需要执行的脚本

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作者:Lcry
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