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;
- }
- }
运行下MonitorBeanImpl类,读者将会看到当前的内存、cpu利用率等信息。
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;
- }
- }
运行下MonitorBeanImpl类,读者将会看到当前的内存、cpu利用率等信息。