java获得CPU使用率,系统内存,虚拟机内存等情况（上）
通过jmx可以监控vm内存使用,系统内存使用等以下是网上某博客代码，特点是通过window和linux命令获得CPU使用率。
Java代码http://jiangyongyuan.iteye.com/images/icon_star.png
[*] 利用java程序实现获取计算机cpu利用率和内存使用信息。
[*]
[*] 创建一个Bean用来存贮要得到的信
[*]
[*]public class MonitorInfoBean {
[*] /** 可使用内存. */
[*] private long totalMemory;
[*]
[*] /**剩余内存. */
[*] private long freeMemory;
[*]
[*] /** 最大可使用内存. */
[*] private long maxMemory;
[*]
[*] /** 操作系统. */
[*] private String osName;
[*]
[*] /** 总的物理内存. */
[*] private long totalMemorySize;
[*]
[*] /** 剩余的物理内存. */
[*] private long freePhysicalMemorySize;
[*]
[*] /** 已使用的物理内存. */
[*] private long usedMemory;
[*]
[*] /** 线程总数. */
[*] private int totalThread;
[*]
[*] /** cpu使用率. */
[*] private double cpuRatio;
[*]
[*] public long getFreeMemory() {
[*] return freeMemory;
[*] }
[*]
[*] public void setFreeMemory(long freeMemory) {
[*] this.freeMemory = freeMemory;
[*] }
[*]
[*] public long getFreePhysicalMemorySize() {
[*] return freePhysicalMemorySize;
[*] }
[*]
[*] public void setFreePhysicalMemorySize(long freePhysicalMemorySize) {
[*] this.freePhysicalMemorySize = freePhysicalMemorySize;
[*] }
[*]
[*] public long getMaxMemory() {
[*] return maxMemory;
[*] }
[*]
[*] public void setMaxMemory(long maxMemory) {
[*] this.maxMemory = maxMemory;
[*] }
[*]
[*] public String getOsName() {
[*] return osName;
[*] }
[*]
[*] public void setOsName(String osName) {
[*] this.osName = osName;
[*] }
[*]
[*] public long getTotalMemory() {
[*] return totalMemory;
[*] }
[*]
[*] public void setTotalMemory(long totalMemory) {
[*] this.totalMemory = totalMemory;
[*] }
[*]
[*] public long getTotalMemorySize() {
[*] return totalMemorySize;
[*] }
[*]
[*] public void setTotalMemorySize(long totalMemorySize) {
[*] this.totalMemorySize = totalMemorySize;
[*] }
[*]
[*] public int getTotalThread() {
[*] return totalThread;
[*] }
[*]
[*] public void setTotalThread(int totalThread) {
[*] this.totalThread = totalThread;
[*] }
[*]
[*] public long getUsedMemory() {
[*] return usedMemory;
[*] }
[*]
[*] public void setUsedMemory(long usedMemory) {
[*] this.usedMemory = usedMemory;
[*] }
[*]
[*] public double getCpuRatio() {
[*] return cpuRatio;
[*] }
[*]
[*] public void setCpuRatio(double cpuRatio) {
[*] this.cpuRatio = cpuRatio;
[*] }
[*]}
[*]
[*] 之后，建立bean的接口
[*]
[*]public interface IMonitorService {
[*] public MonitorInfoBean getMonitorInfoBean() throws Exception;
[*]
[*]}
[*]
[*]然后，就是最关键的，得到cpu的利用率，已用内存，可用内存，最大内存等信息。
[*]
[*]import java.io.InputStreamReader;
[*]import java.io.LineNumberReader;
[*]
[*]import sun.management.ManagementFactory;
[*]
[*]import com.sun.management.OperatingSystemMXBean;
[*]import java.io.*;
[*]import java.util.StringTokenizer;
[*]
[*]/**
[*]
[*]* 获取系统信息的业务逻辑实现类.
[*]* @author GuoHuang
[*]*/
[*]public class MonitorServiceImpl implements IMonitorService {
[*]
[*] private static final int CPUTIME = 30;
[*]
[*] private static final int PERCENT = 100;
[*]
[*] private static final int FAULTLENGTH = 10;
[*]
[*] private static final File versionFile = new File("/proc/version");
[*] private static String linuxVersion = null;
[*]
[*] /**
[*] * 获得当前的监控对象.
[*] * @return 返回构造好的监控对象
[*] * @throws Exception
[*] * @author GuoHuang
[*] */
[*] public MonitorInfoBean getMonitorInfoBean() throws Exception {
[*] int kb = 1024;
[*]
[*] // 可使用内存
[*] long totalMemory = Runtime.getRuntime().totalMemory() / kb;
[*] // 剩余内存
[*] long freeMemory = Runtime.getRuntime().freeMemory() / kb;
[*] // 最大可使用内存
[*] long maxMemory = Runtime.getRuntime().maxMemory() / kb;
[*]
[*] OperatingSystemMXBean osmxb = (OperatingSystemMXBean) ManagementFactory
[*] .getOperatingSystemMXBean();
[*]
[*] // 操作系统
[*] String osName = System.getProperty("os.name");
[*] // 总的物理内存
[*] long totalMemorySize = osmxb.getTotalPhysicalMemorySize() / kb;
[*] // 剩余的物理内存
[*] long freePhysicalMemorySize = osmxb.getFreePhysicalMemorySize() / kb;
[*] // 已使用的物理内存
[*] long usedMemory = (osmxb.getTotalPhysicalMemorySize() - osmxb
[*] .getFreePhysicalMemorySize())
[*] / kb;
[*]
[*] // 获得线程总数
[*] ThreadGroup parentThread;
[*] for (parentThread = Thread.currentThread().getThreadGroup(); parentThread
[*] .getParent() != null; parentThread = parentThread.getParent())
[*] ;
[*] int totalThread = parentThread.activeCount();
[*]
[*] double cpuRatio = 0;
[*] if (osName.toLowerCase().startsWith("windows")) {
[*] cpuRatio = this.getCpuRatioForWindows();
[*] }
[*] else {
[*] cpuRatio = this.getCpuRateForLinux();
[*] }
[*]
[*] // 构造返回对象
[*] MonitorInfoBean infoBean = new MonitorInfoBean();
[*] infoBean.setFreeMemory(freeMemory);
[*] infoBean.setFreePhysicalMemorySize(freePhysicalMemorySize);
[*] infoBean.setMaxMemory(maxMemory);
[*] infoBean.setOsName(osName);
[*] infoBean.setTotalMemory(totalMemory);
[*] infoBean.setTotalMemorySize(totalMemorySize);
[*] infoBean.setTotalThread(totalThread);
[*] infoBean.setUsedMemory(usedMemory);
[*] infoBean.setCpuRatio(cpuRatio);
[*] return infoBean;
[*] }
[*] 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();
[*] String nice = tokenStat.nextToken();
[*]
[*] System.out.println(user+" , "+system+" , "+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 - c0;
[*] long busytime = c1 - c0;
[*] 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;
[*] 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 = idletime;
[*] retn = 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;
[*] }
[*] return tgt;
[*] }
[*]}
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