此程序的目的是执行远程机器上的Shell脚本。
【环境参数】
远程机器IP:192.168.174.129
用户名:root
密码:root
Shell脚本的路径:/root/test/test.sh
【具体步骤】
1、在远程机器上,准备Shell脚本。
2、修改test.sh的文件权限,确保可执行
3、开启远程机器的sshd的权限
步骤:
1、修改sshd_config文件,命令为:vi /etc/ssh/sshd_config
2、将#PasswordAuthentication no的注释去掉,并且将NO修改为YES
3、将#PermitRootLogin yes的注释去掉
4、重新启动SSH服务,命令为:/etc/init.d/sshd restart
5、验证SSH服务状态,命令为:/etc/init.d/sshd status
若没有开启sshd服务,会提示以下这样的错误:
java.io.IOException: Password authentication failed.
at ch.ethz.ssh2.auth.AuthenticationManager.authenticatePassword(AuthenticationManager.java:300)
at ch.ethz.ssh2.Connection.authenticateWithPassword(Connection.java:309)
at test.demo.TestSSH.main(TestSSH.java:19)
Caused by: java.io.IOException: Authentication method password not supported by the server at this stage.
at ch.ethz.ssh2.auth.AuthenticationManager.authenticatePassword(AuthenticationManager.java:270)
... 2 more
echo [`date +'%Y-%m-%d %H:%M:%S'`]' start loading data...'
echo [`date +'%Y-%m-%d %H:%M:%S'`]' end loading data...'
exit
2、导入需要依赖的jar包。
Java远程调用Shell脚本这个程序需要ganymed-ssh2-build210.jar包。
下载地址:http://www.ganymed.ethz.ch/ssh2/
为了调试方便,可以将\ganymed-ssh2-build210\src下的代码直接拷贝到我们的工程里,
此源码的好处就是没有依赖很多其他的包,拷贝过来干干净净。
3、java调用工具类:
package test;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.nio.charset.Charset;
import org.apache.commons.io.IOUtils;
import ch.ethz.ssh2.ChannelCondition;
import ch.ethz.ssh2.Connection;
import ch.ethz.ssh2.Session;
import ch.ethz.ssh2.StreamGobbler;
public class RemoteShellExecutor {
private Connection conn;
/** 远程机器IP */
private String ip;
/** 用户名 */
private String osUsername;
/** 密码 */
private String password;
private String charset = Charset.defaultCharset().toString();
private static final int TIME_OUT = 1000 * 5 * 60;
/**
* 构造函数
* @param ip
* @param usr
* @param pasword
*/
public RemoteShellExecutor(String ip, String usr, String pasword) {
this.ip = ip;
this.osUsername = usr;
this.password = pasword;
}
/**
* 登录
* @return
* @throws IOException
*/
private boolean login() throws IOException {
conn = new Connection(ip);
conn.connect();
return conn.authenticateWithPassword(osUsername, password);
}
/**
* 执行脚本
*
* @param cmds
* @return
* @throws Exception
*/
public int exec(String cmds) throws Exception {
InputStream stdOut = null;
InputStream stdErr = null;
String outStr = "";
String outErr = "";
int ret = -1;
try {
if (login()) {
// Open a new {@link Session} on this connection
Session session = conn.openSession();
// Execute a command on the remote machine.
session.execCommand(cmds);
stdOut = new StreamGobbler(session.getStdout());
outStr = processStream(stdOut, charset);
stdErr = new StreamGobbler(session.getStderr());
outErr = processStream(stdErr, charset);
session.waitForCondition(ChannelCondition.EXIT_STATUS, TIME_OUT);
System.out.println("outStr=" + outStr);
System.out.println("outErr=" + outErr);
ret = session.getExitStatus();
} else {
throw new Exception("登录远程机器失败" + ip); // 自定义异常类 实现略
}
} finally {
if (conn != null) {
conn.close();
}
IOUtils.closeQuietly(stdOut);
IOUtils.closeQuietly(stdErr);
}
return ret;
}
/**
* @param in
* @param charset
* @return
* @throws IOException
* @throws UnsupportedEncodingException
*/
private String processStream(InputStream in, String charset) throws Exception {
byte[] buf = new byte[1024];
StringBuilder sb = new StringBuilder();
while (in.read(buf) != -1) {
sb.append(new String(buf, charset));
}
return sb.toString();
}
public static void main(String args[]) throws Exception {
RemoteShellExecutor executor = new RemoteShellExecutor("192.168.174.128", "root", "root");
executor.exec("chmod 740 /root/test/test.sh");
System.out.println(executor.exec("/root/test/test.sh t_users myDataBase01"));
}
}
5、运行结果
outStr=
outErr=
outStr=[2017-07-14 00:12:47] start loading data...
2017-07-14 00:12:47] end loading data...
6、说明:
0 // getExitStatus方法的返回值
注:一般情况下shell脚本正常执行完毕,getExitStatus方法返回0。
此方法通过远程命令取得Exit Code/status。但并不是每个server设计时都会返回这个值,如果没有则会返回null。
在调用getExitStatus时,要先调用WaitForCondition方法