Java实现远程连接Linux并执行命令

需要的jar包

<dependency>
        <groupId>ch.ethz.ganymedgroupId>
        <artifactId>ganymed-ssh2artifactId>
        <version>${ganymed-ssh2}version>
    dependency>
     <dependency>  
        <groupId>commons-iogroupId>  
        <artifactId>commons-ioartifactId>  
        <version>${commons-io}version>  
        <type>jartype>  
        <scope>compilescope>  
    dependency>  
    <dependency>  
        <groupId>commons-langgroupId>  
        <artifactId>commons-langartifactId>  
        <version>${commons-lang}version>  
        <type>jartype>  
        <scope>compilescope>  
    dependency>

连接及执行命令代码

package com.kpatch.utils;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;

import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import ch.ethz.ssh2.Connection;
import ch.ethz.ssh2.Session;
import ch.ethz.ssh2.StreamGobbler;

public class RemoteCommandUtil {

    private static final Logger log = LoggerFactory.getLogger(RemoteCommandUtil.class);
    private static String  DEFAULTCHART="UTF-8"; 

    /** 
     * 登录主机 
     * @return 
     *      登录成功返回true，否则返回false 
     */  
    public static Connection login(String ip,
                            String userName,
                            String userPwd){  

        boolean flg=false;
        Connection conn = null;
        try {  
            conn = new Connection(ip);  
            conn.connect();//连接  
            flg=conn.authenticateWithPassword(userName, userPwd);//认证  
            if(flg){
                log.info("=========登录成功========="+conn);
                return conn;
            }
        } catch (IOException e) {  
            log.error("=========登录失败========="+e.getMessage());
            e.printStackTrace();  
        }  
        return conn;  
    }  

    /** 
     * 远程执行shll脚本或者命令 
     * @param cmd 
     *      即将执行的命令 
     * @return 
     *      命令执行完后返回的结果值 
     */  
    public static String execute(Connection conn,String cmd){  
        String result="";  
        try {  
            if(conn !=null){  
                Session session= conn.openSession();//打开一个会话  
                session.execCommand(cmd);//执行命令  
                result=processStdout(session.getStdout(),DEFAULTCHART);  
                //如果为得到标准输出为空，说明脚本执行出错了  
                if(StringUtils.isBlank(result)){
                    log.info("得到标准输出为空,链接conn:"+conn+",执行的命令："+cmd);
                    result=processStdout(session.getStderr(),DEFAULTCHART);  
                }else{
                    log.info("执行命令成功,链接conn:"+conn+",执行的命令："+cmd);
                }  
                conn.close();  
                session.close();  
            }  
        } catch (IOException e) {
            log.info("执行命令失败,链接conn:"+conn+",执行的命令："+cmd+"  "+e.getMessage());
            e.printStackTrace();  
        }  
        return result;  
    }
    /** 
     * 解析脚本执行返回的结果集 
     * @param in 输入流对象 
     * @param charset 编码 
     * @return 
     *       以纯文本的格式返回 
     */  
     private static String processStdout(InputStream in, String charset){  
         InputStream  stdout = new StreamGobbler(in);  
         StringBuffer buffer = new StringBuffer();;  
         try {  
             BufferedReader br = new BufferedReader(new InputStreamReader(stdout,charset));  
             String line=null;  
             while((line=br.readLine()) != null){  
                 buffer.append(line+"\n");  
             }  
         } catch (UnsupportedEncodingException e) { 
             log.error("解析脚本出错："+e.getMessage());
             e.printStackTrace();  
         } catch (IOException e) {
             log.error("解析脚本出错："+e.getMessage());
             e.printStackTrace();  
         }  
         return buffer.toString();  
     }  
}