FileWriter fw = new FileWriter("I:/log.txt", true);     PrintWriter pw = new PrintWriter(fw);     pw.println("time:" + new SimpleDateFormat("yyyy-MM-dd HH:mm:ss S").format(new Date()));   pw.println("cpu负荷占用: " +  ManagementFactory.getPlatformMXBean(OperatingSystemMXBean.class).getSystemCpuLoad());     pw.close();    fw.close();