获取cpu、内存、磁盘io、网络流量等相关数据

Question

我要检测服务器上的性能：现在要做个java的程序 希望 有代码！ 和讲解 谢谢

Answer 1

private double getCpuRatioForWindows() {
    try {
        String procCmd = System.getenv("windir")
                + "\\system32\\wbem\\wmic.exe process get Caption,"
                + "KernelModeTime,ReadOperationCount,UserModeTime,WriteOperationCount";
        // 取进程信息
        long[] c0 = readCpu(Runtime.getRuntime().exec(procCmd));
        Thread.sleep(CPUTIME);
        long[] c1 = readCpu(Runtime.getRuntime().exec(procCmd));
        if (c0 != null && c1 != null) {
            long idletime = c1[0] - c0[0];
            long busytime = c1[1] - c0[1];
            return Double.valueOf(
                    PERCENT * (busytime) / (busytime + idletime))
                    .doubleValue();
        } else {
            return 0.0;
        }
    } catch (Exception ex) {
        ex.printStackTrace();
        return 0.0;
    }
}

private long[] readCpu(final Process proc) {
    long[] retn = new long[2];
    try {
        proc.getOutputStream().close();
        InputStreamReader ir = new InputStreamReader(proc.getInputStream(), "gb2312");
        LineNumberReader input = new LineNumberReader(ir);
        String line = input.readLine();
        if (line == null || line.length() < FAULTLENGTH) {
            return null;
        }
        int capidx = line.indexOf("Caption");
        int kmtidx = line.indexOf("KernelModeTime");
        int rocidx = line.indexOf("ReadOperationCount");
        int umtidx = line.indexOf("UserModeTime");
        int wocidx = line.indexOf("WriteOperationCount");
        long idletime = 0;
        long kneltime = 0;
        long usertime = 0;
        while ((line = input.readLine()) != null) {
            if (line.length() < wocidx) {
                continue;
            }
            // 字段出现顺序：Caption,KernelModeTime,ReadOperationCount,
            // UserModeTime,WriteOperation
            String caption = substring(line, capidx, kmtidx - 1)
                    .trim();
            // log.info("line="+line);
            if (caption.equals("System Idle Process")
                    || caption.equals("System")) {
                idletime += Long.valueOf(
                        substring(line, kmtidx, rocidx - 1).trim())
                        .longValue();
                idletime += Long.valueOf(
                        substring(line, umtidx, wocidx - 1).trim())
                        .longValue();
                continue;
            } else if (caption.equals("wmic.exe"))
                continue;
            kneltime += Long.valueOf(
                    substring(line, kmtidx, rocidx - 1).trim())
                    .longValue();
            usertime += Long.valueOf(
                    substring(line, umtidx, wocidx - 1).trim())
                    .longValue();
        }
        retn[0] = idletime;
        retn[1] = kneltime + usertime;
        return retn;
    } catch (Exception ex) {
        ex.printStackTrace();
    } finally {
        try {
            proc.getInputStream().close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    return null;
}