java 获取系统信息及CPU的使用率(转)

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java 获取系统信息及CPU的使用率

原文:http://kakaluyi.javaeye.com/blog/211492

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:
Java代码 复制代码

    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;   
        }   
    }  

[java] view plain copy

    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:
Java代码 复制代码

    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;   
      
    }  

[java] view plain copy

    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:
Java代码 复制代码

    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");   
        }   
    }  

[java] view plain copy

    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;  
        }  
          
        /** *//**

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