Java运行时类-无法在cmd提示符中cd

此程序将从java创建服务器证书，而无需打开命令promptat（至少手动），此代码将成功执行，但无论是在cded目录中，还是在cmd加载upc:\Documents and Settings\administrator的默认目录中，我都看不到我的文件server.jks。我更感兴趣的是在指定的目录中生成。帮助我修改代码以实现这一点

  public class SslKeytool
 {
public void createServerCertificate(String dn, String alias, String validity, String keystoreName, String keypass, String storepass, String drive, String path)
{
    try
    {
        Runtime runtime = Runtime.getRuntime();
        String result;
        result = "keytool -genkeypair ";
        result = result + "-alias " + alias + " ";

        result = result + "-keyalg RSA -dname " + dn + " -validity " + validity + " -keypass" + keypass + " -keystorename " + keystoreName
                + " -storepass" + storepass;
        runtime.exec("cmd " + drive + ":");
        runtime.exec("cmd cd " + path);
        runtime.exec("cmd " + result);
    }
    catch (Exception e)
    {
        System.out.println("Whoa! Something went wrong! please make sure that you read the API ");
        e.printStackTrace();
    }
}

public static void main(String[] args)
{
    SslKeytool obj = new SslKeytool();
    obj.createServerCertificate("CN=LCMS,OU=Software Solutions,O=Live Connections,L=Chennai,S=TamilNadu,C=Ind", "servercert", "365", "abc.jks", "lcmsauth"
            , "lcmsauth", "f", "/keytest");

}
}

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看看这篇文章，我知道如何创建一个自签名证书，但我想通过java和动态地创建它。你考虑过这篇文章吗？