java程序实现获取计算机cpu利用率和内存使用信息的代码

1、利用java程序实现获取计算机cpu利用率和内存使用信息。创建一个Bean用来存贮要得到的信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 freePhysicalMe

2、morySize;/* 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 freePhysicalMemory

3、Size;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(Strin

4、g 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;pu

5、blic 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

6、(double cpuRatio this.cpuRatio = cpuRatio;之后,建立bean的接口public interface IMonitorService public MonitorInfoBean getMonitorInfoBean( throws Exception;然后,就是最关键的,得到cpu的利用率,已用内存,可用内存,最大内存等信息。import java.io.InputStreamReader;import java.io.LineNumberReader;import sun.management.ManagementFactory;import com

7、.sun.management.OperatingSystemMXBean;import java.io.*;import java.util.StringTokenizer;/* 获取系统信息的业务逻辑实现类.* author GuoHuang*/public class MonitorServiceImpl implements IMonitorService private static final int CPUTIME = 30;private static final int PERCENT = 100;private static final int FAULTLENGTH =

8、10;private static final File versionFile = new File("/proc/version"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.getR

9、untime(.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("

10、"/ 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 (parent

11、Thread = 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 = this.

12、getCpuRateForLinux(;/ 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(totalMemor

13、ySize;infoBean.setTotalThread(totalThread;infoBean.setUsedMemory(usedMemory;infoBean.setCpuRatio(cpuRatio;return infoBean;private static double getCpuRateForLinux(InputStream is = null;InputStreamReader isr = null;BufferedReader brStat = null;StringTokenizer tokenStat = null;trySystem.out.println(&q

14、uot;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.

15、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+" ,

16、"+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

17、 = new Float(nice.floatValue(;return (userUsage+systemUsage+niceUsage/100;elsebrStat.readLine(;brStat.readLine(;tokenStat = new StringTokenizer(brStat.readLine(;tokenStat.nextToken(;tokenStat.nextToken(;tokenStat.nextToken(;tokenStat.nextToken(;tokenStat.nextToken(;tokenStat.nextToken(;tokenStat.nex

18、tToken(;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 ioeSystem.out.println(ioe.getMessage(;freeResource(is, isr, brStat;return 1

19、; finallyfreeResource(is, isr, brStat;private static void freeResource(InputStream is, InputStreamReader isr, BufferedReader brtryif(is!=nullis.close(;if(isr!=nullisr.close(;if(br!=nullbr.close(;catch(IOException ioeSystem.out.println(ioe.getMessage(;/* 获得CPU使用率.* return 返回cpu使用率* author GuoHuang*/p

20、rivate double getCpuRatioForWindows( try String procCmd = System.getenv("windir"+ "system32wbemwmic.exeprocess get Caption,CommandLine,"+"KernelModeTime,ReadOperationCount,ThreadCount,UserModeTime,WriteOperationC ount"/ 取进程信息long c0 = readCpu(Runtime.getRuntime(.exec(pr

21、ocCmd;Thread.sleep(CPUTIME;long c1 = readCpu(Runtime.getRuntime(.exec(procCmd;if (c0 != null && c1 != null long idletime = c10 - c00;long busytime = c11 - c01;return Double.valueOf(PERCENT * (busytime / (busytime + idletime.doubleValue(; else return 0.0; catch (Exception ex ex.printStackTrac

22、e(;return 0.0;/* 读取CPU信息.* param proc* return* author GuoHuang*/private long readCpu(final Process proc long retn = new long2;try proc.getOutputStream(.close(;InputStreamReader ir = new InputStreamReader(proc.getInputStream(; LineNumberReader input = new LineNumberReader(ir;String line = input.readL

23、ine(;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("Ker

24、nelModeTime"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,WriteO

25、perationString caption = Bytes.substring(line, capidx, cmdidx - 1.trim(;String cmd = Bytes.substring(line, cmdidx, kmtidx - 1.trim(;if (cmd.indexOf("wmic.exe" >= 0 continue;/ ("line="+line;if (caption.equals("System Idle Process"| caption.equals("System&

26、quot; 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.subst

27、ring(line, umtidx, wocidx - 1.trim(.longValue(;retn0 = idletime;retn1 = 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 GuoHuang*/public static void main(String args throws Exception IMonitorService service = new MonitorServiceImpl(;MonitorInfoBean monitorInfo = serv