我正在使用 JSCH lib 在远程机器上执行一些 mongodb 命令，我有一个程序有三种方法

  • connect(serverIP, userName, password) ：它将连接到服务器并且有线路

session.connect() 抛出异常

If invalid credentails: JschException:Auth Fail ，

If SSH is not enabled in server :JschException:java.net.ConnectException: Connection refused



If server is not in network: JschException:java.net.NoRouteToHostException: No route to host

  • executeCommand(command) ：它将执行命令和打印结果

  • disconnect() ：它将与服务器断开连接 .

我已经附上了三种方法的代码 .

问题：如果我们使用 session.connect() 而不知道网络中是否有可用的服务器，则抛出异常 JschException:NotRouteToHostException .

有没有办法验证服务器是否可用于网络，而不是获得异常？

如果是，我们如何进行验证？

public void connect(String serverIP, String serverUserName, String password ){
            JSch jsch = new JSch();
            try {
                session = jsch.getSession(serverUserName, serverIP, 22);
            } catch (JSchException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            session.setPassword(password);
            java.util.Properties config = new java.util.Properties();
            config.put("StrictHostKeyChecking", "no");
            session.setConfig(config);
            try {
                session.connect();

            } catch (JSchException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

    }

public StringBuffer executeCommand(String script) throws JSchException, IOException{
    String sudo_pass = "test";
    ChannelExec channel = (ChannelExec) session.openChannel("exec");
    ((ChannelExec) channel).setCommand( script);

    InputStream in = channel.getInputStream();
    OutputStream out = channel.getOutputStream();
    ((ChannelExec) channel).setErrStream(System.err);

    channel.connect();
    out.write((sudo_pass + "\n").getBytes());
    out.flush();

    StringBuffer commandResult = new StringBuffer();
    byte[] tmp = new byte[1024];
    while (true) {
        while (in.available() > 0) {
            int i = in.read(tmp, 0, 1024);
            if (i < 0)
                break;
            commandResult.append(new String(tmp, 0, i));
            Logger.of(LoggerConstants.AUTOMATTER_LOGGER).debug(new String(tmp, 0, i));
            Logger.of(LoggerConstants.AUTOMATTER_LOGGER).info(new String(tmp, 0, i));
            //System.out.print(new String(tmp, 0, i));
        }
        if (channel.isClosed()) {
            //System.out.println("exit-status: " + channel.getExitStatus());
            break;
        }
        try {
            Thread.sleep(1000);
        } catch (Exception ee) {
            System.out.println(ee);
        }
    }
    channel.disconnect();
    System.out.println("Sudo disconnect");
    return commandResult;
}

public void disconnect(){
    session.disconnect();
}
java mongodb jsch