JAVA执行shell命令小工具

在我们的项目中，大部分环境的服务器用的都是Linux，从而使用JAVA与Linux shell通讯，就成了一项很常见的事情。

Ganymed SSH是一个Java实现SSH的项目
Java 实现SSH协议的项目有很多，如JFTP，trilead SSH，JSCH，ganymed SSH等
下面我们主要说的是关于ganymed SSH的一些小使用。
Ganymed SSH-2 for Java是用纯Java实现SSH-2协议的一个项目。可以通过它直接在Java程序中连接SSH服务器，实现基于SSH协议的服务访问。 如远程命令执行和shell访问,本地和远程端口转发，本地数据流转发，X11转发，SCP，SFTP等功能。



散仙测试的demo如下：

<pre name="code" class="java">package com.qin.shell;


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

import org.mortbay.log.Log;


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

public class ExecShell{
private String IP;//要远程登录的IP地址
private String username;//用户名
private String password;//密码

public ExecShell(String IP, String username,String password){
this.IP=IP;
this.username=username;
this.password=password;
}

//命令执行
public boolean exec( String command ) throws InterruptedException{
Log.info("command: "+command);
boolean rtn = false;
try {
Connection conn = new Connection(IP);
conn.connect();
boolean isAuthenticated = conn.authenticateWithPassword(username, password);
if (isAuthenticated == false){
throw new IOException("Authentication failed.");
}
Session sess = conn.openSession();
sess.execCommand(command);

InputStream stdout = new StreamGobbler(sess.getStdout());
BufferedReader br = new BufferedReader(new InputStreamReader(stdout));

InputStream stderr = new StreamGobbler(sess.getStderr());
BufferedReader stderrReader = new BufferedReader(new InputStreamReader(stderr));

String line = null;
while ( (line = br.readLine())!=null )
{
Log.info("GanyMedUtil out> "+line);
}

while (true)
{
line = stderrReader.readLine();
if (line == null)
break;
Log.info("GanyMedUtil out> "+line);
}

/* Show exit status, if available (otherwise "null") */ 
Log.info("ExitCode: " + sess.getExitStatus()+" "+IP+":"+command);
sess.close();
conn.close();
rtn = new Integer(0).equals(sess.getExitStatus());
return rtn;
}
catch (IOException e)
{
Log.warn("Error ......................",e);
e.printStackTrace();
System.exit(2);
return rtn;
}
}





public static void main(String[] args) throws InterruptedException {

ExecShell es = new ExecShell("192.168.75.130","root","dongliang");
System.out.println("==========================================单个命令测试执行==========================================");
es.exec("ls");//执行单行命令
System.out.println("==========================================多个命令测试执行==========================================");
es.exec("cd /root/apache-nutch-1.8/ && ls && date");//多个命令之间使用&&隔开
//ganyMedUtil.execMoreShellCommand("");
//ganyMedUtil.exec("ls");

}

}</pre>
输出的内容如下所示:
<pre name="code" class="java">2014-05-28 15:27:19.076:INFO::Logging to STDERR via org.mortbay.log.StdErrLog
2014-05-28 15:27:19.076:INFO::command: ls
2014-05-28 15:27:19.454:INFO::GanyMedUtil out> 2
2014-05-28 15:27:19.454:INFO::GanyMedUtil out> abc.txt
2014-05-28 15:27:19.454:INFO::GanyMedUtil out> anaconda-ks.cfg
2014-05-28 15:27:19.454:INFO::GanyMedUtil out> apache-ant-1.9.2
2014-05-28 15:27:19.454:INFO::GanyMedUtil out> apache-ant-1.9.2-bin.tar.gz
2014-05-28 15:27:19.454:INFO::GanyMedUtil out> apache-nutch-1.8
2014-05-28 15:27:19.454:INFO::GanyMedUtil out> apache-nutch-1.8-src.zip
2014-05-28 15:27:19.454:INFO::GanyMedUtil out> a.sh
2014-05-28 15:27:19.454:INFO::GanyMedUtil out> bb.sh
2014-05-28 15:27:19.454:INFO::GanyMedUtil out> b.sh
2014-05-28 15:27:19.454:INFO::GanyMedUtil out> case.sh
2014-05-28 15:27:19.454:INFO::GanyMedUtil out> cip.sh
2014-05-28 15:27:19.454:INFO::GanyMedUtil out> c.sh
2014-05-28 15:27:19.454:INFO::GanyMedUtil out> date
2014-05-28 15:27:19.455:INFO::GanyMedUtil out> d.sh
2014-05-28 15:27:19.455:INFO::GanyMedUtil out> e.sh
2014-05-28 15:27:19.455:INFO::GanyMedUtil out> f.sh
2014-05-28 15:27:19.455:INFO::GanyMedUtil out> ganglia_20140327155418.zip
2014-05-28 15:27:19.455:INFO::GanyMedUtil out> ganglia-3.1.7-3.el6.rf.x86_64.rpm
2014-05-28 15:27:19.455:INFO::GanyMedUtil out> ganglia-devel-3.1.7-3.el6.rf.x86_64.rpm
2014-05-28 15:27:19.455:INFO::GanyMedUtil out> ganglia-gmetad-3.1.7-3.el6.rf.x86_64.rpm
2014-05-28 15:27:19.455:INFO::GanyMedUtil out> ganglia-gmond-3.1.7-3.el6.rf.x86_64.rpm
2014-05-28 15:27:19.455:INFO::GanyMedUtil out> ganglia-gmond-python-3.1.7-3.el6.rf.x86_64.rpm
2014-05-28 15:27:19.455:INFO::GanyMedUtil out> ganglia-web-3.1.7-3.el6.rf.x86_64.rpm
2014-05-28 15:27:19.455:INFO::GanyMedUtil out> gg.sh
2014-05-28 15:27:19.455:INFO::GanyMedUtil out> hadoop1.2
2014-05-28 15:27:19.455:INFO::GanyMedUtil out> hadoop-1.2.0.tar.gz
2014-05-28 15:27:19.455:INFO::GanyMedUtil out> installganglia.sh
2014-05-28 15:27:19.455:INFO::GanyMedUtil out> install.log
2014-05-28 15:27:19.455:INFO::GanyMedUtil out> install.log.syslog
2014-05-28 15:27:19.455:INFO::GanyMedUtil out> jdk1.7
2014-05-28 15:27:19.455:INFO::GanyMedUtil out> jdk-7u51-linux-x64.tar.gz
2014-05-28 15:27:19.455:INFO::GanyMedUtil out> jmxtrans-20121016.145842.6a28c97fbb-0.noarch.rpm
2014-05-28 15:27:19.456:INFO::GanyMedUtil out> libconfuse-2.7-6.2.x86_64.rpm
2014-05-28 15:27:19.456:INFO::GanyMedUtil out> libevent-2.0.21-stable
2014-05-28 15:27:19.456:INFO::GanyMedUtil out> libevent-2.0.21-stable.tar.gz
2014-05-28 15:27:19.456:INFO::GanyMedUtil out> memcached-1.4.15
2014-05-28 15:27:19.456:INFO::GanyMedUtil out> memcached-1.4.15.tar.gz
2014-05-28 15:27:19.456:INFO::GanyMedUtil out> my.sh
2014-05-28 15:27:19.456:INFO::GanyMedUtil out> pp
2014-05-28 15:27:19.456:INFO::GanyMedUtil out> solr-4.3.1.tgz
2014-05-28 15:27:19.456:INFO::GanyMedUtil out> test.jar
2014-05-28 15:27:19.456:INFO::GanyMedUtil out> test.py
2014-05-28 15:27:19.456:INFO::GanyMedUtil out> zookeeper
2014-05-28 15:27:19.456:INFO::GanyMedUtil out> zookeeper.zip
2014-05-28 15:27:19.456:INFO::ExitCode: 0 192.168.75.130:ls
==========================================多个命令测试执行==========================================
2014-05-28 15:27:19.458:INFO::command: cd /root/apache-nutch-1.8/ && ls && date
2014-05-28 15:27:19.789:INFO::GanyMedUtil out> bb.sh
2014-05-28 15:27:19.789:INFO::GanyMedUtil out> build
2014-05-28 15:27:19.789:INFO::GanyMedUtil out> build.xml
2014-05-28 15:27:19.789:INFO::GanyMedUtil out> CHANGES.txt
2014-05-28 15:27:19.789:INFO::GanyMedUtil out> conf
2014-05-28 15:27:19.789:INFO::GanyMedUtil out> default.properties
2014-05-28 15:27:19.789:INFO::GanyMedUtil out> docs
2014-05-28 15:27:19.789:INFO::GanyMedUtil out> ivy
2014-05-28 15:27:19.789:INFO::GanyMedUtil out> lib
2014-05-28 15:27:19.789:INFO::GanyMedUtil out> LICENSE.txt
2014-05-28 15:27:19.789:INFO::GanyMedUtil out> NOTICE.txt
2014-05-28 15:27:19.789:INFO::GanyMedUtil out> README.txt
2014-05-28 15:27:19.789:INFO::GanyMedUtil out> runtime
2014-05-28 15:27:19.789:INFO::GanyMedUtil out> src
2014-05-28 15:27:19.790:INFO::GanyMedUtil out> 2014年 05月 28日 星期三 23:27:19 CST
2014-05-28 15:27:19.790:INFO::ExitCode: 0 192.168.75.130:cd /root/apache-nutch-1.8/ && ls && date
</pre>

能够在在应用程序中，执行shell脚本是非常有用的，我们可以自己写一个shell脚本，把多个shell命令，封装起来，然后执行一次shell即可。

这样如何保证安全呢