用java取得linux系统cpu、内存的实时信息

   * @throws InterruptedException
   */
   public static float getCpuInfo() throws IOException, InterruptedException
   {
      File file = new File("/proc/stat");
      BufferedReader br = new BufferedReader(new InputStreamReader(
      new FileInputStream(file)));
      StringTokenizer token = new StringTokenizer(br.readLine());
      token.nextToken();
      int user1 = Integer.parseInt(token.nextToken());
      int nice1 = Integer.parseInt(token.nextToken());
      int sys1 = Integer.parseInt(token.nextToken());
      int idle1 = Integer.parseInt(token.nextToken());
   
      Thread.sleep(1000);

      br = new BufferedReader(
      new InputStreamReader(new FileInputStream(file)));
      token = new StringTokenizer(br.readLine());
      token.nextToken();
      int user2 = Integer.parseInt(token.nextToken());
      int nice2 = Integer.parseInt(token.nextToken());
      int sys2 = Integer.parseInt(token.nextToken());
      int idle2 = Integer.parseInt(token.nextToken());

      return (float)((user2 + sys2 + nice2) - (user1 + sys1 + nice1)) / (float)((user2 + nice2 + sys2 + idle2) - (user1 + nice1 + sys1 + idle1));
   }
}

/**
* 测试类
*
* <p>@author javer QQ:84831612</p>
* @date 2005
*/
public class JaverTest
{
    public static void main(String args) throws Exception
    {
        int memInfo = LinuxSystemTool.getMemInfo();
        System.out.println("MemTotal：" + memInfo[0]);
        System.out.println("MemFree：" + memInfo);
        System.out.println("SwapTotal：" + memInfo);
        System.out.println("SwapFree：" + memInfo);

        System.out.println("CPU利用率：" + LinuxSystemTool.getCpuInfo());
    }
}