JAVA获得CPU和内存的使用情况的两种方法

OperatingSystemMXBean osmxb = (OperatingSystemMXBean) Management Factory
.getOperatingSystemMXBean();
// 操作系统 String osName = System.getProperty(""); // 总的物理内存 long totalMemorySize = osmxb.getTotalPhysicalMemorySize() / k b; // 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
import sun.management.ManagementFactory;
import com.sun.management.OperatingSystemMXBean;
/** *//** * 获取系统信息的业务逻辑实现类. * @author amg * @version 1.0 Creation date: 2008-3-11 - 上午 10:06:06 */
public class MonitorServiceImpl implements IMonitorService { //可以设置长些，防止读到运行此次系统检查时的 cpu 占用率，就不准了 private static final int CPUTIME = 5000;
private static final int PERCENT = 100;
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;
mmandLine,"
+ "KernelModeTime,ReadOperationCount,ThreadCount,Use
rModeTime,WriteOperationCount";
// 取进程信息
long[] c0 = readCpu(Runtime.getRuntime().exec(procCmd));
private static final int FAULTLENGTH = 10;
/** *//**
* 获得当前的监控对象.来自* @return 返回构造好的监控对象
* @throws Exception
* @author amg
* Creation date: 2008-4-25 - 上午 10:45:08
}
public long getTotalMemorySize() { return totalMemorySize;
}
public void setTotalMemorySize(long totalMemorySize) { this.totalMemorySize = totalMemorySize;
.getFreePhysicalMemorySize()) / kb;
// 获得线程总数 ThreadGroup parentThread; for (parentThread = Thread.currentThread().getThreadGroup(); par entThread
.getParent() != null; parentThread = parentThread.getPar ent())
; int totalThread = parentThread.activeCount();
double cpuRatio = 0; if (osName.toLowerCase().startsWith("windows")) {
cpuRatio = this.getCpuRatioForWindows(); }
}
public long getFreePhysicalMemorySize() { return freePhysicalMemorySize;
}
public void setFreePhysicalMemorySize(long freePhysicalMemorySiz e) {
this.freePhysicalMemorySize = freePhysicalMemorySize; }
}
public void setUsedMemory(long usedMemory) { edMemory = usedMemory;
}
public double getCpuRatio() { return cpuRatio;
}
public void setCpuRatio(double cpuRatio) { this.cpuRatio = cpuRatio;
public MonitorInfoBean getMonitorInfoBean() throws Exception;
}
该类的实现类 MonitorServiceImpl 如下所示： Java 代码
package com.amgkaka.performance;
import java.io.InputStreamReader; import java.io.LineNumberReader;
infoBean.setTotalThread(totalThread); infoBean.setUsedMemory(usedMemory); infoBean.setCpuRatio(cpuRatio); return infoBean; }
/** *//**
* 获得 CPU 使用率.
* @return 返回 cpu 使用率
}
public int getTotalThread() { return totalThread;
}
public void setTotalThread(int totalThread) { this.totalThread = totalThread;
}
public long getUsedMemory() { return usedMemory;
public interface IMonitorService {
/** *//** * 获得当前的监控对象. * @return 返回构造好的监控对象 * @throws Exception * @author amgkaka * Creation date: 2008-4-25 - 上午 10:45:08 */
/** *//** 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;
* @author amg
* Creation date: 2008-4-25 - 下午 06:05:11
*/
private double getCpuRatioForWindows() {
try {
String procCmd = System.getenv("windir")
+ "\\system32\\wbem\\wmic.exe process get Caption,Co
public long getMaxMemory() { return maxMemory;
}
public void setMaxMemory(long maxMemory) { this.maxMemory = maxMemory;
}
public String getOsName() { return osName;
// 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);
Thread.sleep(CPUTIME);
long[] c1 = readCpu(Runtime.getRuntime().exec(procCmd));
/** *//** 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;
Java 获得 cpu 和内存的使用情况
最近做个项目，就是要取得 cpu 占有率等等的系统信息，一开始以为要用动态链接库了，但后来发现可以 像下面这样做，不去调用 jni，这样省去了很多看新技术的时间 o(∩_∩)o... 在 Java 中，可以获得总的物理内存、剩余的物理内存、已使用的物理内存等信息，下面例子可以取得这些 信息，并且获得在 Windows 下的内存使用率。