ganymed-ssh2简介

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 Ganymed SSH-2 for Java是用纯Java实现SSH-2协议的一个包。在使用它的过程中非常容易,只需要指定合法的用户名口令,或者授权认证文件,就可以创建到远程Linux主机的连接,在建立起来的会话中调用该Linux主机上的脚本文件,执行相关操作。使用方法:将 ganymed-ssh2-build210.jar 加入到项目的lib中。简单示例:

假定我在192.168.0.114的Linux系统的/home/lldu目录下放了一个文件夹test,test文件夹对应测试Java类的包名test,我们在该机器上运用javac ./test/Main.java编译后,再通过调用下面的代码完成远程调用:

import ch.ethz.ssh2.Connection;import ch.ethz.ssh2.ConnectionInfo;import ch.ethz.ssh2.Session;/**** @author lldu*/public class Main {    public static void main(String[] args) {        try {            Connection con = new Connection("192.168.0.114");            ConnectionInfo info = con.connect();            boolean result = con.authenticateWithPassword("lldu", "123456");            Session session = con.openSession();            session.execCommand("java test.Main");        } catch (Exception ex) {            System.out.println(ex.getLocalizedMessage());        }    }}

总结使用步骤:


1.首先构造一个连接器,传入一个需要登陆的ip地址 

Connection conn = new Connection(ipAddr);conn.connect(); // 连接


2.模拟登陆目的服务器 传入用户名和密码 

boolean isAuthenticated = conn.authenticateWithPassword(username, password);

它会返回一个布尔值,true 代表成功登陆目的服务器,否则登陆失败

3.打开一个session,有点象Hibernate的session ,执行你需要的linux 脚本命令 。

Session sess = conn.openSession();sess.execCommand("last");

4.接收目标服务器上的控制台返回结果,读取br中的内容

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


5.得到脚本运行成功与否的标志 :0-成功 非0-失败

System.out.println("ExitCode: " + sess.getExitStatus());

6.关闭session和connection 

sess.close();conn.close();

需要说明的是:
1.通过第2步认证成功后,当前目录就位于/home/username/目录之下,你可以指定脚本文件所在的绝对路径,或者通过cd导航到脚本文件所在的目录,然后传递执行脚本所需要的参数,完成脚本调用执行。


2.执行脚本以后,可以获取脚本执行的结果文本,需要对这些文本进行正确编码后返回给客户端,避免乱码产生。


3.如果你需要执行多个linux控制台脚本,比如第一个脚本的返回结果是第二个脚本的入参,你必须打开多个Session,也就是多次调用

Session sess = conn.openSession();,使用完毕记得关闭就可以了



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摘录部分源码如下:

import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import org.apache.log4j.Logger; import ch.ethz.ssh2.Connection; import ch.ethz.ssh2.SCPClient; import ch.ethz.ssh2.Session; import ch.ethz.ssh2.StreamGobbler; public class CommandRunner { private static final Logger logger = Logger.getLogger(CommandRunner.class); //从其他网络计算机中拿去文件 public static void scpGet(String host, String username, String password,    String remoteFile, String localDir) throws IOException { if (logger.isDebugEnabled()) {    logger.debug("spc [" + remoteFile + "] from " + host + " to "      + localDir); } Connection conn = getOpenedConnection(host, username, password); SCPClient client = new SCPClient(conn); client.get(remoteFile, localDir); conn.close(); } //将文件拷贝到其他计算机上 public static void scpPut(String host, String username, String password,    String localFile, String remoteDir) throws IOException { if (logger.isDebugEnabled()) {    logger.debug("spc [" + localFile + "] to " + host + remoteDir); } Connection conn = getOpenedConnection(host, username, password); SCPClient client = new SCPClient(conn); client.put(localFile, remoteDir); conn.close(); }
//执行SSH命令.public static int runSSH(String host, String username, String password,    String cmd) throws IOException { if (logger.isDebugEnabled()) {    logger.debug("running SSH cmd [" + cmd + "]"); } Connection conn = getOpenedConnection(host, username, password); Session sess = conn.openSession(); sess.execCommand(cmd); InputStream stdout = new StreamGobbler(sess.getStdout()); BufferedReader br = new BufferedReader(new InputStreamReader(stdout)); while (true) {    String line = br.readLine();    if (line == null)     break;    if (logger.isDebugEnabled()) {     logger.debug(line);    } } sess.close(); conn.close(); return sess.getExitStatus().intValue(); } //获得连接private static Connection getOpenedConnection(String host, String username,    String password) throws IOException { if (logger.isDebugEnabled()) {    logger.debug("connecting to " + host + " with user " + username      + " and pwd " + password); } Connection conn = new Connection(host); conn.connect(); // make sure the connection is opened boolean isAuthenticated = conn.authenticateWithPassword(username,     password); if (isAuthenticated == false)    throw new IOException("Authentication failed."); return conn; } //执行本地的cmd命令.(DOS命令)public static int runLocal(String cmd) throws IOException { if (logger.isDebugEnabled()) {    logger.debug("running local cmd [" + cmd + "]"); } Runtime rt = Runtime.getRuntime(); Process p = rt.exec(cmd); InputStream stdout = new StreamGobbler(p.getInputStream()); BufferedReader br = new BufferedReader(new InputStreamReader(stdout)); while (true) {    String line = br.readLine();    if (line == null)     break;    if (logger.isDebugEnabled()) {     logger.debug(line);    } } return p.exitValue(); } }
	
				
		
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