java 获取计算机cpu 利用率和内存使用信息
+nice);? ?????????????????????????????????user = user.substring(0,user.indexOf("%"));? ????????????????system = system.substring(0,system.indexOf("%"));? ????????????????nice = nice.substring(0,nice.indexOf("%"));? ?????????????????????????????????float userUsage = new Float(user).floatValue();? ????????????????float systemUsage = new Float(system).floatValue();? ????????????????float niceUsage = new Float(nice).floatValue();? ?????????????????????????????????return (userUsage+systemUsage+niceUsage)/100;? ????????????}else{? ????????????????brStat.readLine();? ????????????????brStat.readLine();? ?????????????????????????????????????tokenStat = new StringTokenizer(brStat.readLine());? ????????????????tokenStat.nextToken();? ????????????????tokenStat.nextToken();? ????????????????tokenStat.nextToken();? ????????????????tokenStat.nextToken();? ????????????????tokenStat.nextToken();? ????????????????tokenStat.nextToken();? ????????????????tokenStat.nextToken();? ????????????????String cpuUsage = tokenStat.nextToken();? ??????????????????????????????????????????????????????System.out.println("CPU idle : "+cpuUsage);? ????????????????Float usage = new Float(cpuUsage.substring(0,cpuUsage.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));? ????????????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;? ????????}? ????}? ??????/**?????? ??* 读取CPU信息.? ?????* @param proc? ?????* @return? ?????* @author GuoHuang? ?????*/?????private long[] readCpu(final Process proc) {? ????????long[] retn = new long[2];? ????????try {? ????????????proc.getOutputStream().close();? ????????????InputStreamReader ir = new InputStreamReader(proc.getInputStream());? ????????????LineNumberReader input = new LineNumberReader(ir);? ????????????String line = input.readLine();? ????????????if (line == null || line.length() < FAULTLENGTH) {? ????????????????return null;? ????????????}? ????????????int capidx = line.indexOf("Caption");? ????????????int cmdidx = line.indexOf("CommandLine");? ????????????int rocidx = line.indexOf("ReadOperationCount");? ????????????int umtidx = line.indexOf("UserModeTime");? ????????????int kmtidx = line.indexOf("KernelModeTime");? ????????????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,CommandLine,KernelModeTime,ReadOperationCount,? ????????????????// ThreadCount,UserModeTime,WriteOperation? ????????????????String caption = Bytes.substring(line, capidx, cmdidx - 1)? ????????????????????????.trim();? ????????????????String cmd = Bytes.substring(line, cmdidx, kmtidx - 1).trim();? ????????????????if (cmd.indexOf("wmic.exe") >= 0) {? ????????????????????continue;? ????????????????}? ????????????????// log.info("line="+line);? ????????????????if (caption.equals("System Idle Process")? ????????????????????????|| caption.equals("System")) {? ????????????????????idletime += Long.valueOf(? ????????????????????????????Bytes.substring(line, kmtidx, rocidx - 1).trim())? ????????????????????????????.longValue();? ????????????????????idletime += Long.valueOf(? ????????????????????????????Bytes.substring(line, umtidx, wocidx - 1).trim())? ????????????????????????????.longValue();? ????????????????????continue;? ????????????????}? ??????????????????kneltime += Long.valueOf(? ????????????????????????Bytes.substring(line, kmtidx, rocidx - 1).trim())? ????????????????????????.longValue();? ????????????????usertime += Long.valueOf(? ????????????????????????Bytes.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;? ????}? ?????????/**???? 测试方法.? ?????* @param args? ?????* @throws Exception? ?????* @author GuoHuang? ???????*/?????public static void main(String[] args) throws Exception {? ????????IMonitorService service = new MonitorServiceImpl();? ????????MonitorInfoBean monitorInfo = service.getMonitorInfoBean();? ????????System.out.println("cpu占有率=" + monitorInfo.getCpuRatio());? ?????????????????System.out.println("可使用内存=" + monitorInfo.getTotalMemory());? ????????System.out.println("剩余内存=" + monitorInfo.getFreeMemory());? ????????System.out.println("最大可使用内存=" + monitorInfo.getMaxMemory());? ?????????????????System.out.println("操作系统=" + monitorInfo.getOsName());? ????????System.out.println("总的物理内存=" + monitorInfo.getTotalMemorySize() + "kb");? ????????System.out.println("剩余的物理内存=" + monitorInfo.getFreeMemory() + "kb");? ????????System.out.println("已使用的物理内存=" + monitorInfo.getUsedMemory() + "kb");? ????????System.out.println("线程总数=" + monitorInfo.getTotalThread() + "kb");? ????}? }? ??????其中，Bytes类用来处理字符串? ?????public class Bytes {? ????public static String substring(String src, int start_idx, int end_idx){? ????????byte[] b = src.getBytes();? ????????String tgt = "";? ????????for(int i=start_idx; i<=end_idx; i++){? ????????????tgt +=(char)b[i];? ????????}? ????????return tgt;? ????}? }