Java如何执行cmd命令

//当前绝对路径
System.out.println(IoUtil.read(Runtime.getRuntime().exec("cmd /c echo %cd%").getInputStream(), Charset.forName("gbk")));
//创建文件夹
System.out.println(IoUtil.read(Runtime.getRuntime().exec("cmd /c mkdir db").getInputStream(), Charset.forName("gbk")));
System.out.println(IoUtil.read(Runtime.getRuntime().exec("cmd /c cd db").getInputStream(), Charset.forName("gbk")));
//创建文件
System.out.println(IoUtil.read(Runtime.getRuntime().exec("cmd /c type nul>barrier.db").getInputStream(),Charset.forName("gbk")));

Process p = Runtime.getRuntime().exec("cmd /c " + cmd命令, null, new File(execFileDir));

InputStream is1 = p.getInputStream() 
new Thread(() -> {
    BufferedReader br = new BufferedReader(new InputStreamReader(is1, Charset.forName("GBK")));
    try {
        String outputLine = null;
        while ((outputLine = br.readLine()) != null) {
            builder.append(outputLine);
        }

    } catch (IOException e) {
        logger.error("获取inputStream打印信息异常", e);
    }
}).start();

InputStream is2 = p.getErrorStream();
BufferedReader br2 = new BufferedReader(new InputStreamReader(is2, Charset.forName("GBK")));
StringBuilder buf = new StringBuilder();
String line = null;
while ((line = br2.readLine()) != null) {
    buf.append(line);
}
p.waitFor();