Fork me on GitHub

Java 实现 bash命令

Java 实现 bash命令


 

1、BASH 命令简介

Bash,Unix shell的一种,在1987年由布莱恩·福克斯为了GNU计划而编写。1989年发布第一个正式版本,原先是计划用在GNU操作系统上,但能运行于大多数类Unix系统的操作系统之上,包括Linux与Mac OS X v10.4都将它作为默认shell。
Bash是Bourne shell的后继兼容版本与开放源代码版本,它的名称来自Bourne shell(sh)的一个双关语(Bourne again / born again):Bourne-Again SHell。
Bash是一个命令处理器,通常运行于文本窗口中,并能执行用户直接输入的命令。Bash还能从文件中读取命令,这样的文件称为脚本。和其他Unix shell 一样,它支持文件名替换(通配符匹配)、管道here文档、命令替换、变量,以及条件判断和循环遍历的结构控制语句。包括关键字、语法在内的基本特性全部是从sh借鉴过来的。其他特性,例如历史命令,是从cshksh借鉴而来。总的来说,Bash虽然是一个满足POSIX规范的shell,但有很多扩展。
 

2、Java实现 BASH命令执行Shell脚本

1)代码实现如下:

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.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;


public class BashUtil {

    private Logger logger = LoggerFactory.getLogger(BashUtil.class);

    private String hostname;

    private String username;

    private String password;

    private int port;

    private Connection conn;

    private BashUtil() {
    }

    public BashUtil(String hostname, String username, String password) {
        this(hostname, username, password, 22);
    }

    public BashUtil(String hostname, String username, String password, Integer port) {
        this.hostname = hostname;
        this.username = username;
        this.password = password;
        if (port == null) {
            port = 22;
        } else {
            this.port = port;
        }
    }

    /**
     * 创建连接并认证
     * @return
     */
    public Boolean connection() {
        try {
            conn = new Connection(hostname, port);
            conn.connect();
            boolean isAuthenticated = conn.authenticateWithPassword(username, password);
            return isAuthenticated;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * 关闭连接
     */
    public void close() {
        try {
            conn.close();
            conn = null;
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 执行shell命令
     * @param command
     * @return
     */
    public List<String> command(String command) {
        if (conn == null && !connection()) {
            logger.error("Authentication failed.");
            return null;
        }
        List<String> result = new ArrayList<String>();
        try {
            Session sess = conn.openSession();
            sess.execCommand(command);
            InputStream stdout = new StreamGobbler(sess.getStdout());
            InputStream stderr = new StreamGobbler(sess.getStderr());
            BufferedReader br_out = new BufferedReader(new InputStreamReader(stdout, "utf-8"));
            BufferedReader br_err = new BufferedReader(new InputStreamReader(stderr, "utf-8"));
            StringBuffer sb_err = new StringBuffer();
            String line = null;
            while ((line = br_out.readLine()) != null) {
                result.add(line.trim());
            }
            while ((line = br_err.readLine()) != null) {
                sb_err.append(line + "\n");
            }
            if (isNotEmpty(sb_err.toString())) {
                logger.error(sb_err.toString());
                return null;
            }
            return result;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }


    private static boolean isEmpty(String content) {
        if (content == null) {
            return true;
        } else {
            return "".equals(content.trim()) || "null".equalsIgnoreCase(content.trim());
        }
    }

    private static boolean isNotEmpty(String content) {
        return !isEmpty(content);
    }

    public static void main(String[] args){
        String hostname = "192.168.123.234";   // 此处根据实际情况,换成自己需要访问的主机IP
        String userName = "root";
        String password = "password";
        Integer port = 22;
        String command = "cd /home/miracle&&pwd&&ls&&cat luna.txt";

        BashUtil bashUtil = new BashUtil(hostname, userName, password, port);
        List<String> resultList = bashUtil.command(command);
        StringBuffer result = new StringBuffer("");
        resultList.forEach(str -> result.append(str + "\n"));

        System.out.println("执行的结果如下: \n" + result.toString());
    }
}

 

2)执行结果如下:

执行的结果如下: 
/home/miracle
luna.txt
Hello, I'm SshUtil.
Nice to meet you.^_^

 

3)pom.xml引用依赖包如下:

        <!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-api -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.21</version>
        </dependency>

<!-- ssh --> <dependency> <groupId>ch.ethz.ganymed</groupId> <artifactId>ganymed-ssh2</artifactId> <version>262</version> </dependency>

 

 PS:

Maven依赖jar包问题,请参考如下博文:

https://www.cnblogs.com/miracle-luna/p/11863679.html 

 

Java 实现 bash命令
https://www.cnblogs.com/miracle-luna/p/12050728.html

 

Java 实现 ssh命令 登录主机执行shell命令
https://www.cnblogs.com/miracle-luna/p/12050367.html

 

Java 实现 telnet命令 验证主机端口的连通性
https://www.cnblogs.com/miracle-luna/p/12049658.html

 

Java 检查IPv6地址的合法性
https://www.cnblogs.com/miracle-luna/p/12041780.html

 

Java 实现判断 主机是否能 ping 通
https://www.cnblogs.com/miracle-luna/p/12026797.html

posted @ 2019-12-16 19:09  龙凌云端  阅读(2114)  评论(0编辑  收藏  举报