java实现linux连接操作
此程序需要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。
此程序的目的是执行远程机器上的Shell脚本。
远程机器IP:***.**.**.***
用户名:sshapp
密码:sshapp
登录后用pwd命令,显示当前目录为:/sshapp.
在/sshapp/myshell/目录下有myTest.sh文件,内容如下:
public class RmtShellExecutor {
private Connection conn;
private String ip;
private String usr;
private String psword;
private String charset = Charset.defaultCharset().toString();
private static final int TIME_OUT = 1000 * 5 * 60;
public RmtShellExecutor(ShellParam param) {
this.ip = param.getIp();
this.usr = param.getUsername();
this.psword = param.getPassword();
}
public RmtShellExecutor(String ip, String usr, String ps) {
this.ip = ip;
this.usr = usr;
this.psword = ps;
}
private boolean login() throws IOException {
conn = new Connection(ip);
conn.connect();
return conn.authenticateWithPassword(usr, psword);
}
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 AppException("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;
}
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 {
RmtShellExecutor exe = new RmtShellExecutor("***.**.**.***", "sshapp", "sshapp");
// 执行myTest.sh 参数为java Know dummy
System.out.println(exe.exec("sh /webapp/myshell/myTest.sh java Know dummy"));
// exe.exec("uname -a && date && uptime && who");
}
}
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,通过ChannelCondition.java接口的定义可以看到每个条件的具体含义
而getExitStatus的返回值,可以认为是此次执行是否OK的标准。