java如何獲取實(shí)時(shí)cpu使用情況？

Linux好像會(huì)把CPU的狀態(tài)存起來(lái)吧？你直接去讀那個(gè)文件就好了，樓主百度下Linux的相關(guān)命令

metric-jvm，現(xiàn)成的。

使用ajax定時(shí)輪詢,返回?cái)?shù)據(jù)顯示在頁(yè)面上
也可以后臺(tái)定時(shí)獲取cpu使用情況使用WebSocket推送到客戶端

利用一個(gè)叫 JMX (Java Management Extensions) 的組件，JDK自帶的。示例可參考這段代碼：

https://github.com/xqbase/met...

通過(guò) snmp 可以獲得 監(jiān)控?cái)?shù)據(jù)

首先編寫一個(gè)MonitorInfoBean類，用來(lái)裝載監(jiān)控的一些信息，包括物理內(nèi)存、剩余的物理內(nèi)存、已使用的物理內(nèi)存、內(nèi)存使用率等字段，該類的代碼如下：

package com.amgkaka.performance;   
  
/** *//**  
 * 監(jiān)視信息的JavaBean類.  
 * @author  amg  
 * @version 1.0   
 * Creation date: 2008-4-25 - 上午10:37:00  
 */  
public class MonitorInfoBean {   
    /** *//** 可使用內(nèi)存. */  
    private long totalMemory;   
       
    /** *//** 剩余內(nèi)存. */  
    private long freeMemory;   
       
    /** *//** 最大可使用內(nèi)存. */  
    private long maxMemory;   
       
    /** *//** 操作系統(tǒng). */  
    private String osName;   
       
    /** *//** 總的物理內(nèi)存. */  
    private long totalMemorySize;   
       
    /** *//** 剩余的物理內(nèi)存. */  
    private long freePhysicalMemorySize;   
       
    /** *//** 已使用的物理內(nèi)存. */  
    private long usedMemory;   
       
    /** *//** 線程總數(shù). */  
    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;   
    }   
}  


package com.amgkaka.performance;  
  
/** *//** 
 * 監(jiān)視信息的JavaBean類. 
 * @author  amg 
 * @version 1.0  
 * Creation date: 2008-4-25 - 上午10:37:00 
 */  
public class MonitorInfoBean {  
    /** *//** 可使用內(nèi)存. */  
    private long totalMemory;  
      
    /** *//** 剩余內(nèi)存. */  
    private long freeMemory;  
      
    /** *//** 最大可使用內(nèi)存. */  
    private long maxMemory;  
      
    /** *//** 操作系統(tǒng). */  
    private String osName;  
      
    /** *//** 總的物理內(nèi)存. */  
    private long totalMemorySize;  
      
    /** *//** 剩余的物理內(nèi)存. */  
    private long freePhysicalMemorySize;  
      
    /** *//** 已使用的物理內(nèi)存. */  
    private long usedMemory;  
      
    /** *//** 線程總數(shù). */  
    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;  
    }  
}  

接著編寫一個(gè)獲得當(dāng)前的監(jiān)控信息的接口，該類的代碼如下所示：

package com.amgkaka.performance;   
  
/** *//**  
 * 獲取系統(tǒng)信息的業(yè)務(wù)邏輯類接口.  
 * @author amg * @version 1.0   
 * Creation date: 2008-3-11 - 上午10:06:06  
 */  
public interface IMonitorService {   
    /** *//**  
     * 獲得當(dāng)前的監(jiān)控對(duì)象.  
     * @return 返回構(gòu)造好的監(jiān)控對(duì)象  
     * @throws Exception  
     * @author amgkaka  
     * Creation date: 2008-4-25 - 上午10:45:08  
     */  
    public MonitorInfoBean getMonitorInfoBean() throws Exception;   
  
}  


package com.amgkaka.performance;  
  
/** *//** 
 * 獲取系統(tǒng)信息的業(yè)務(wù)邏輯類接口. 
 * @author amg * @version 1.0  
 * Creation date: 2008-3-11 - 上午10:06:06 
 */  
public interface IMonitorService {  
    /** *//** 
     * 獲得當(dāng)前的監(jiān)控對(duì)象. 
     * @return 返回構(gòu)造好的監(jiān)控對(duì)象 
     * @throws Exception 
     * @author amgkaka 
     * Creation date: 2008-4-25 - 上午10:45:08 
     */  
    public MonitorInfoBean getMonitorInfoBean() throws Exception;  
  
}  

該類的實(shí)現(xiàn)類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;   
  
/** *//**  
 * 獲取系統(tǒng)信息的業(yè)務(wù)邏輯實(shí)現(xiàn)類.  
 * @author amg * @version 1.0 Creation date: 2008-3-11 - 上午10:06:06  
 */  
public class MonitorServiceImpl implements IMonitorService {   
    //可以設(shè)置長(zhǎng)些，防止讀到運(yùn)行此次系統(tǒng)檢查時(shí)的cpu占用率，就不準(zhǔn)了   
    private static final int CPUTIME = 5000;   
  
    private static final int PERCENT = 100;   
  
    private static final int FAULTLENGTH = 10;   
  
    /** *//**  
     * 獲得當(dāng)前的監(jiān)控對(duì)象.  
     * @return 返回構(gòu)造好的監(jiān)控對(duì)象  
     * @throws Exception  
     * @author amg     * Creation date: 2008-4-25 - 上午10:45:08  
     */  
    public MonitorInfoBean getMonitorInfoBean() throws Exception {   
        int kb = 1024;   
           
        // 可使用內(nèi)存   
        long totalMemory = Runtime.getRuntime().totalMemory() / kb;   
        // 剩余內(nèi)存   
        long freeMemory = Runtime.getRuntime().freeMemory() / kb;   
        // 最大可使用內(nèi)存   
        long maxMemory = Runtime.getRuntime().maxMemory() / kb;   
  
        OperatingSystemMXBean osmxb = (OperatingSystemMXBean) ManagementFactory   
                .getOperatingSystemMXBean();   
  
        // 操作系統(tǒng)   
        String osName = System.getProperty("os.name");   
        // 總的物理內(nèi)存   
        long totalMemorySize = osmxb.getTotalPhysicalMemorySize() / kb;   
        // 剩余的物理內(nèi)存   
        long freePhysicalMemorySize = osmxb.getFreePhysicalMemorySize() / kb;   
        // 已使用的物理內(nèi)存   
        long usedMemory = (osmxb.getTotalPhysicalMemorySize() - osmxb   
                .getFreePhysicalMemorySize())   
                / kb;   
  
        // 獲得線程總數(shù)   
        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();   
        }   
           
        // 構(gòu)造返回對(duì)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;   
    }   
  
    /** *//**  
     * 獲得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")   
                    + "http://system32//wbem//wmic.exe process get Caption,CommandLine,"  
                    + "KernelModeTime,ReadOperationCount,ThreadCount,UserModeTime,WriteOperationCount";   
            // 取進(jìn)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;   
        }   
    }   
  
    /** *//**  
     * 讀取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;   
                }   
                // 字段出現(xiàn)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;   
    }   
       
    /** *//**  
     * 測(cè)試方法.  
     * @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("可使用內(nèi)存=" + monitorInfo.getTotalMemory());   
        System.out.println("剩余內(nèi)存=" + monitorInfo.getFreeMemory());   
        System.out.println("最大可使用內(nèi)存=" + monitorInfo.getMaxMemory());   
           
        System.out.println("操作系統(tǒng)=" + monitorInfo.getOsName());   
        System.out.println("總的物理內(nèi)存=" + monitorInfo.getTotalMemorySize() + "kb");   
        System.out.println("剩余的物理內(nèi)存=" + monitorInfo.getFreeMemory() + "kb");   
        System.out.println("已使用的物理內(nèi)存=" + monitorInfo.getUsedMemory() + "kb");   
        System.out.println("線程總數(shù)=" + monitorInfo.getTotalThread() + "kb");   
    }   
}  



package com.amgkaka.performance;  
  
import java.io.InputStreamReader;  
import java.io.LineNumberReader;  
  
import sun.management.ManagementFactory;  
  
import com.sun.management.OperatingSystemMXBean;  
  
/** *//** 
 * 獲取系統(tǒng)信息的業(yè)務(wù)邏輯實(shí)現(xiàn)類. 
 * @author amg * @version 1.0 Creation date: 2008-3-11 - 上午10:06:06 
 */  
public class MonitorServiceImpl implements IMonitorService {  
    //可以設(shè)置長(zhǎng)些，防止讀到運(yùn)行此次系統(tǒng)檢查時(shí)的cpu占用率，就不準(zhǔn)了  
    private static final int CPUTIME = 5000;  
  
    private static final int PERCENT = 100;  
  
    private static final int FAULTLENGTH = 10;  
  
    /** *//** 
     * 獲得當(dāng)前的監(jiān)控對(duì)象. 
     * @return 返回構(gòu)造好的監(jiān)控對(duì)象 
     * @throws Exception 
     * @author amg     * Creation date: 2008-4-25 - 上午10:45:08 
     */  
    public MonitorInfoBean getMonitorInfoBean() throws Exception {  
        int kb = 1024;  
          
        // 可使用內(nèi)存  
        long totalMemory = Runtime.getRuntime().totalMemory() / kb;  
        // 剩余內(nèi)存  
        long freeMemory = Runtime.getRuntime().freeMemory() / kb;  
        // 最大可使用內(nèi)存  
        long maxMemory = Runtime.getRuntime().maxMemory() / kb;  
  
        OperatingSystemMXBean osmxb = (OperatingSystemMXBean) ManagementFactory  
                .getOperatingSystemMXBean();  
  
        // 操作系統(tǒng)  
        String osName = System.getProperty("os.name");  
        // 總的物理內(nèi)存  
        long totalMemorySize = osmxb.getTotalPhysicalMemorySize() / kb;  
        // 剩余的物理內(nèi)存  
        long freePhysicalMemorySize = osmxb.getFreePhysicalMemorySize() / kb;  
        // 已使用的物理內(nèi)存  
        long usedMemory = (osmxb.getTotalPhysicalMemorySize() - osmxb  
                .getFreePhysicalMemorySize())  
                / kb;  
  
        // 獲得線程總數(shù)  
        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();  
        }  
          
        // 構(gòu)造返回對(duì)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;  
    }  
  
    /** *//** 
     * 獲得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")  
                    + "http://system32//wbem//wmic.exe process get Caption,CommandLine,"  
                    + "KernelModeTime,ReadOperationCount,ThreadCount,UserModeTime,WriteOperationCount";  
            // 取進(jìn)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;  
        }  
    }  
  
    /** *//** 
     * 讀取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;  
                }  
                // 字段出現(xiàn)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;  
    }  
      
    /** *//** 
     * 測(cè)試方法. 
     * @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("可使用內(nèi)存=" + monitorInfo.getTotalMemory());  
        System.out.println("剩余內(nèi)存=" + monitorInfo.getFreeMemory());  
        System.out.println("最大可使用內(nèi)存=" + monitorInfo.getMaxMemory());  
          
        System.out.println("操作系統(tǒng)=" + monitorInfo.getOsName());  
        System.out.println("總的物理內(nèi)存=" + monitorInfo.getTotalMemorySize() + "kb");  
        System.out.println("剩余的物理內(nèi)存=" + monitorInfo.getFreeMemory() + "kb");  
        System.out.println("已使用的物理內(nèi)存=" + monitorInfo.getUsedMemory() + "kb");  
        System.out.println("線程總數(shù)=" + monitorInfo.getTotalThread() + "kb");  
    }  
}  

該實(shí)現(xiàn)類中需要用到一個(gè)自己編寫byte的工具類，該類的代碼如下所示：

package com.amgkaka.performance;   
  
/** *//**  
 * byte操作類.  
 * @author amg * @version 1.0   
 * Creation date: 2008-4-30 - 下午04:57:23  
 */  
public class Bytes {   
    /** *//**  
     * 由于String.subString對(duì)漢字處理存在問(wèn)題（把一個(gè)漢字視為一個(gè)字節(jié))，因此在  
     * 包含漢字的字符串時(shí)存在隱患，現(xiàn)調(diào)整如下：  
     * @param src 要截取的字符串  
     * @param start_idx 開始坐標(biāo)（包括該坐標(biāo))  
     * @param end_idx   截止坐標(biāo)（包括該坐標(biāo)）  
     * @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;   
    }   
}  



package com.amgkaka.performance;  
  
/** *//** 
 * byte操作類. 
 * @author amg * @version 1.0  
 * Creation date: 2008-4-30 - 下午04:57:23 
 */  
public class Bytes {  
    /** *//** 
     * 由于String.subString對(duì)漢字處理存在問(wèn)題（把一個(gè)漢字視為一個(gè)字節(jié))，因此在 
     * 包含漢字的字符串時(shí)存在隱患，現(xiàn)調(diào)整如下： 
     * @param src 要截取的字符串 
     * @param start_idx 開始坐標(biāo)（包括該坐標(biāo)) 
     * @param end_idx   截止坐標(biāo)（包括該坐標(biāo)） 
     * @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;  
    }  
}  

運(yùn)行下MonitorBeanImpl類，讀者將會(huì)看到當(dāng)前的內(nèi)存、cpu利用率等信息

wmic很強(qiáng)大，網(wǎng)上有很多wmic的命令，

eg:wmic 獲取物理內(nèi)存
wmic memlogical get TotalPhysicalMemory

wmic 獲取進(jìn)程信息，很詳細(xì)

wmic process

System.getProperty("os.name"));//得到操作系統(tǒng)名字
System.getProperty("sun.os.patch.level");//得到操作系統(tǒng)版本