JSP获取CPU使用率、系统内存、虚拟机内存等情况(不用JNI)(4)

    private static double getCpuRateForLinux() {
        InputStream is = null;
        InputStreamReader isr = null;
        BufferedReader brStat = null;
        StringTokenizer tokenStat = null;
        try {
            System.out.println("Get usage rate of CUP , linux version: "
                    + linuxVersion);
            Process process = Runtime.getRuntime().exec("top -b -n 1");
            is = process.getInputStream();
            isr = new InputStreamReader(is);
            brStat = new BufferedReader(isr);
            if (linuxVersion.equals("2.4")) {
                brStat.readLine();
                brStat.readLine();
                brStat.readLine();
                brStat.readLine();
                tokenStat = new StringTokenizer(brStat.readLine());
                tokenStat.nextToken();
                tokenStat.nextToken();
                String user = tokenStat.nextToken();
                tokenStat.nextToken();
                String system = tokenStat.nextToken();
                tokenStat.nextToken();