获取jvm cpu memory等信息工具类

做一个指令监控中心，想用sigar，会依赖插件，麻烦，索性整理一工具类

package commons.utilsKit.VmInfo;

/**
 * @author : 陈磊 <br/>
 *         Date: 13-3-4<br/>
 *         Time: 下午3:55<br/>
 *         connectMethod:[email protected]<br/>
 */
public class MonitorInfoBean {
    /** 可使用内存. */
    private String totalMemory;
    /** 剩余内存. */
    private String freeMemory;
    /** 最大可使用内存. */
    private String maxMemory;

    /** 操作系统. */
    private String osName;
    /** 总的物理内存. */
    private String totalMemorySize;
    /** 剩余的物理内存. */
    private String freePhysicalMemorySize;
    /** 已使用的物理内存. */
    private String usedMemory;

    public String getUsedMemory() {
        return usedMemory;
    }

    public void setUsedMemory(String usedMemory) {
        this.usedMemory = usedMemory;
    }

    public String getFreePhysicalMemorySize() {
        return freePhysicalMemorySize;
    }

    public void setFreePhysicalMemorySize(String freePhysicalMemorySize) {
        this.freePhysicalMemorySize = freePhysicalMemorySize;
    }

    public String getTotalMemorySize() {
        return totalMemorySize;
    }

    public void setTotalMemorySize(String totalMemorySize) {
        this.totalMemorySize = totalMemorySize;
    }

    public String getFreeMemory() {
        return freeMemory;
    }

    public void setFreeMemory(String freeMemory) {
        this.freeMemory = freeMemory;
    }

    public String getMaxMemory() {
        return maxMemory;
    }

    public void setMaxMemory(String maxMemory) {
        this.maxMemory = maxMemory;
    }

    public String getTotalMemory() {
        return totalMemory;
    }

    public void setTotalMemory(String totalMemory) {
        this.totalMemory = totalMemory;
    }

    /** 线程总数. */
    private int totalThread;

    public String getCpuRatio() {
        return cpuRatio;
    }

    public void setCpuRatio(String cpuRatio) {
        this.cpuRatio = cpuRatio;
    }

    /** cpu使用率. */
    private String cpuRatio;


    public String getOsName() {
        return osName;
    }
    public void setOsName(String osName) {
        this.osName = osName;
    }

    public int getTotalThread() {
        return totalThread;
    }
    public void setTotalThread(int totalThread) {
        this.totalThread = totalThread;
    }


}

package commons.utilsKit.VmInfo;

/**
 * @author : 陈磊 <br/>
 *         Date: 13-3-4<br/>
 *         Time: 下午3:56<br/>
 *         connectMethod:[email protected]<br/>
 */
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
     */
    public MonitorInfoBean getMonitorInfoBean() throws Exception;
    /**
     * 获取当前进程的PID
     * @return
     */
    int getPid();
    /**
     * 获取进程ID和主机名
     * @return   "pid@hostname"
     */
     String getPidHostName();

    /**
     * 获取jvm使用的内存
     * @return
     */
     long getUsedMemoryMB();


    /**
     * 获取jvm可用内存
     * @return
     */
     long getFreeMemoryMB();
}

package commons.utilsKit.VmInfo;



/**
 * @author : 陈磊 <br/>
 *         Date: 13-3-4<br/>
 *         Time: 下午3:56<br/>
 *         connectMethod:[email protected]<br/>
 */

import com.sun.management.OperatingSystemMXBean;

import java.io.*;
import java.lang.management.ManagementFactory;
import java.lang.management.RuntimeMXBean;
import java.util.StringTokenizer;

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 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 = getCpuRateForLinux();
        }
        // 构造返回对象
        MonitorInfoBean infoBean = new MonitorInfoBean();
        infoBean.setFreeMemory(freeMemory/1024+"MB");
        infoBean.setFreePhysicalMemorySize(freePhysicalMemorySize/1024+"MB");
        infoBean.setMaxMemory(maxMemory/1024+"MB");
        infoBean.setOsName(osName);
        infoBean.setTotalMemory(totalMemory/1024+"MB");
        infoBean.setTotalMemorySize(totalMemorySize/1024+"MB");
        infoBean.setTotalThread(totalThread);
        infoBean.setUsedMemory(usedMemory/1024+"MB");
        infoBean.setCpuRatio(cpuRatio+"%");
        return infoBean;
    }

    @Override
    public int getPid() {
        RuntimeMXBean runtime = ManagementFactory.getRuntimeMXBean();
        String name = runtime.getName(); // format: "pid@hostname"
        System.out.println("name:"+name);
        try {
            return Integer.parseInt(name.substring(0, name.indexOf('@')));
        } catch (Exception e) {
            return -1;
        }
    }

    @Override
    public String getPidHostName() {
        RuntimeMXBean runtime = ManagementFactory.getRuntimeMXBean();
        return  runtime.getName(); // format: "pid@hostname"
    }

    @Override
    public long getUsedMemoryMB() {
        return (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory())/1048576; // 1024 * 1024 = 1048576;
    }

    @Override
    public long getFreeMemoryMB() {
        return Runtime.getRuntime().freeMemory()/1048576; // 1024 * 1024 = 1048576;
    }

    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[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 GuoHuang
     */
    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 =line.substring( capidx, cmdidx - 1).trim();
                String cmd =line.substring(cmdidx, kmtidx - 1).trim();
                if (cmd.indexOf("wmic.exe") >= 0) {
                    continue;
                }
                String s1 = line.substring(kmtidx, rocidx - 1).trim();
                String s2 =line.substring( umtidx, wocidx - 1).trim();
                if (caption.equals("System Idle Process") || caption.equals("System")) {
                    if (s1.length() > 0)
                        idletime += Long.valueOf(s1).longValue();
                    if (s2.length() > 0)
                        idletime += Long.valueOf(s2).longValue();
                    continue;
                }
                if (s1.length() > 0)
                    kneltime += Long.valueOf(s1).longValue();
                if (s2.length() > 0)
                    usertime += Long.valueOf(s2).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;
    }

    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("最大可使用内存=" + monitorInfo.getMaxMemory());
        System.out.println("可使用内存=" + monitorInfo.getTotalMemory());
        System.out.println("剩余内存=" + monitorInfo.getFreeMemory());


        System.out.println("操作系统=" + monitorInfo.getOsName());

        System.out.println("总的物理内存=" + monitorInfo.getTotalMemorySize());
        System.out.println("已使用的物理内存=" + monitorInfo.getUsedMemory());
        System.out.println("剩余的物理内存=" + monitorInfo.getFreePhysicalMemorySize());
        System.out.println("线程总数=" + monitorInfo.getTotalThread());

        System.out.println("pid: " +service.getPid() );
        System.out.println("FreeMemory: " + service.getFreeMemoryMB());
        System.out.println("usedMemory: " + service.getUsedMemoryMB());
        System.in.read(); // block the program so that we can do some probing on it
    }
}