JSP获取CPU使用率、系统内存、虚拟机内存等情况(不用JNI)(6)

                        .indexOf("%")));
                return (1 - usage.floatValue() / 100);
            }
        } catch (IOException ioe) {
            System.out.println(ioe.getMessage());
            freeResource(is, isr, brStat);
            return 1;
        } finally {
            freeResource(is, isr, brStat);
        }
    }

    private static void freeResource(InputStream is, InputStreamReader isr,
            BufferedReader br) {
        try {
            if (is != null)
                is.close();
            if (isr != null)
                isr.close();
            if (br != null)
                br.close();
        } catch (IOException ioe) {
            System.out.println(ioe.getMessage());
        }
    }

    /**
     * 获得CPU使用率.
     *
     * @return 返回cpu使用率
     * @author GuoHuang
     */
    private double getCpuRatioForWindows() {
        try {
            String procCmd = System.getenv("windir")
                    + "\\system32\\wbem\\wmic.exe process get Caption,CommandLine,KernelModeTime,ReadOperationCount,ThreadCount,UserModeTime,WriteOperationCount";
            // 取进程信息
            long[] c0 = readCpu(Runtime.getRuntime().exec(procCmd));