cpu java 使用率 获取线程 java读取cpu使用率

 

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。
     首先编写一个MonitorInfoBean类，用来装载监控的一些信息，包括物理内存、剩余的物理内存、已使用的物理内存、内存使用率等字段，该类的代码如下：

package com.amgkaka.performance;  
  
/** *//** 
 * 监视信息的JavaBean类. 
 * @author  amg 
 * @version 1.0  
 * Creation date: 2008-4-25 - 上午10:37:00 
 */  
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;  
    }  
}

接着编写一个获得当前的监控信息的接口，该类的代码如下所示：

package com.amgkaka.performance;  
  
/** *//** 
 * 获取系统信息的业务逻辑类接口. 
 * @author amg * @version 1.0  
 * Creation date: 2008-3-11 - 上午10:06:06 
 */  
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 
     */  
    public MonitorInfoBean getMonitorInfoBean() throws Exception;  
  
}

该类的实现类MonitorServiceImpl如下所示：

package com.amgkaka.performance;  
  
import java.io.InputStreamReader;  
import java.io.LineNumberReader;  
  
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;  
  
    private static final int FAULTLENGTH = 10;  
  
    /** *//** 
     * 获得当前的监控对象. 
     * @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 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();  
        }  
          
        // 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;  
    }  
  
    /** *//** 
     * 获得CPU使用率. 
     * @return 返回cpu使用率 
     * @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,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 amg     * Creation date: 2008-4-25 - 下午06:10:14 
     */  
    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 amg     * Creation date: 2008-4-30 - 下午04:47:29 
     */  
    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");  
    }  
}

该实现类中需要用到一个自己编写byte的工具类，该类的代码如下所示：

package com.amgkaka.performance;  
  
/** *//** 
 * byte操作类. 
 * @author amg * @version 1.0  
 * Creation date: 2008-4-30 - 下午04:57:23 
 */  
public class Bytes {  
    /** *//** 
     * 由于String.subString对汉字处理存在问题（把一个汉字视为一个字节)，因此在 
     * 包含汉字的字符串时存在隐患，现调整如下： 
     * @param src 要截取的字符串 
     * @param start_idx 开始坐标（包括该坐标) 
     * @param end_idx   截止坐标（包括该坐标） 
     * @return 
     */  
    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;  
    }  
}