程式來源
http://puremonkey2010.blogspot.tw/2011/05/java-cpu.html
資料來源
http://forum.slime.com.tw/thread61654.html
WMIC，英文全稱Windows Management Instrumentation Command-line，即Windows管理規範指令行。並聲稱使用WMIC，再配合其他現存的指令行工具，管理員幾乎可以完成所有的管理工作，而不必再過多地依賴那些圖形界面。最重要的是wmic可以支援格式化輸出。
具體來說，你可以使用WMIC實現如下的管理工作：
1、本機電腦管理
2、遠端單個電腦管理
3、遠端多個電腦管理
4、使用遠端會話的電腦管理(如Telnet)
5、使用管理指令碼的自動管理
wmic使用範例可以參考這一篇
http://www.dotblogs.com.tw/dc690216/archive/2011/08/13/33059.aspx
程式碼共有如下五個
/*
裝載監控的信息Bean
*/
package cpu_use;
/**
*
* @author bert
*/
public class MonitorInfoBean {
/** 可使用內存. */
private long totalMemory;
/** */
/** 剩餘內存. */
private long freeMemory;
/** */
/** 最大可使用內存. */
private long maxMemory;
/** */
/** 操作系統. */
private String osName;
/** */
/** 總物理內存. */
private long totalMemorySize;
/** */
/** 剩餘的物理內存. */
private long freePhysicalMemorySize;
/** */
/** 已使用的物理內存. */
private long usedMemory;
/** */
/** 線程總數. */
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;
}
}
/*
提供解耦合的介面
*/
package cpu_use;
/**
*
* @author bert
*/
public interface IMonitorService {
/** *//**
* 獲得當前監控對像.
* @return 返回監測對象
* @throws Exception
*/
public MonitorInfoBean getMonitorInfoBean() throws Exception;
}
/*
獲取系統訊息的實作類別
*/
package cpu_use;
import java.io.InputStreamReader;
import java.io.LineNumberReader;
//import sun.management.ManagementFactory;
import java.lang.management.ManagementFactory;
import com.sun.management.OperatingSystemMXBean;
public class MonitorServiceImpl implements IMonitorService
{
public static final int CPUTIME = 5000;
private static final int PERCENT = 100;
private static final int FAULTLENGTH = 10;
private static String PROC_CMD = System.getenv("windir")
+ "\\system32\\wbem\\wmic.exe process get Caption,CommandLine,"
+ "KernelModeTime,ReadOperationCount,ThreadCount,UserModeTime,WriteOperationCount";
private long[] initCpuInfo = null;
public MonitorServiceImpl(){
try{
initCpuInfo = readCpu(Runtime.getRuntime().exec(PROC_CMD));
}catch(Exception e){
e.printStackTrace();
initCpuInfo = null;
}
}
@Override
public MonitorInfoBean getMonitorInfoBean() throws Exception {
int kb = 1024;
// 可使用內存
long totalMemory = Runtime.getRuntime().totalMemory() / kb;
// 剩餘內存
long freeMemory = Runtime.getRuntime().freeMemory() / kb;
// 最大可使用內存
long maxMemory = Runtime.getRuntime().maxMemory() / kb;
OperatingSystemMXBean osmxb = (OperatingSystemMXBean) ManagementFactory
.getOperatingSystemMXBean();
// 操作系統
String osName = System.getProperty("os.name");
// 總物理內存
long totalMemorySize = osmxb.getTotalPhysicalMemorySize() / kb;
// 剩餘的物理內存
long freePhysicalMemorySize = osmxb.getFreePhysicalMemorySize() / kb;
// 已使用的物理內存
long usedMemory = (osmxb.getTotalPhysicalMemorySize() - osmxb
.getFreePhysicalMemorySize())
/ kb;
// 獲得線程總數
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();
}
// 返回對象
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 double getCpuRatioForWindows() {
try {
if(initCpuInfo==null) return 0.0;
// 取得進程信息
//long[] c0 = readCpu(Runtime.getRuntime().exec(PROC_CMD));
//Thread.sleep(CPUTIME);
long[] c1 = readCpu(Runtime.getRuntime().exec(PROC_CMD));
if (c1 != null) {
long idletime = c1[0] - initCpuInfo[0];
long busytime = c1[1] - initCpuInfo[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());
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;
}
// 字段出現順序：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;
}
}
/*
解決 String.subString() 處理中文的問題 (將中文試為一個byte)
*/
package cpu_use;
/**
*
* @author bert
*/
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;
}
}
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package cpu_use;
/**
*
* @author bert
*/
public class CPU_Useage {
public static void main(String args[])
{
MonitorServiceImpl MSImpl = new MonitorServiceImpl();
try {
Thread.sleep(MonitorServiceImpl.CPUTIME);
MonitorInfoBean bean = MSImpl.getMonitorInfoBean();
System.out.println("系統: "+bean.getOsName());
System.out.println("CPU使用率: "+bean.getCpuRatio()+"%");
System.out.println("JVM可使用記憶體: "+String.valueOf(bean.getTotalMemory()/1000.0)+" MB");
System.out.println("JVM尚餘記憶體: "+bean.getFreeMemory()/1000.0+" MB");
System.out.println("JVM最大可配置記憶體: "+bean.getMaxMemory()/1000.0+" MB");
System.out.println("============================");
System.out.println("實體記憶體: "+bean.getTotalMemorySize()/1000.0+" MB");
System.out.println("實體記憶體可用: "+bean.getFreePhysicalMemorySize()/1000.0+" MB");
System.out.println("已使用實體記憶體: "+bean.getUsedMemory()/1000.0+" MB");
System.out.println("============================");
System.out.println("Total Thread in Java: "+bean.getTotalThread());
} catch (Exception e) {
e.printStackTrace();
}
}
}
執行後如下
.png)
