java获得CPU使用率,系统内存,虚拟机内存等情况

蔚落 2022-03-30 10:20 1032阅读 0赞

JXM：Monitoring and Management Interface for the Java™ Platform   
  
通过jmx可以监控vm内存使用,系统内存使用等

以下是网上某博客代码，特点是通过window和linux命令获得CPU使用率。

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 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; 
        } 
    } 
    
        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.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 = 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.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 = this.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(totalMemorySize); 
            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; 
            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 = 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 GuoHuang 
           */ 
        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"); 
        } 
    } 
    
        其中，Bytes类用来处理字符串 
    
       public class Bytes { 
        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; 
        } 
    }