获取系统参数的一些方法

package com.bumt.police.test; 

import java.io.BufferedReader; 
import java.io.File; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.io.LineNumberReader; 
import java.util.StringTokenizer; 

import sun.management.ManagementFactory; 

import com.sun.management.OperatingSystemMXBean; 


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;    
    }    

    
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");    

}   

} 

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;    
    }    
} 

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;    
    }    
}    


interface IMonitorService {    
    public MonitorInfoBean getMonitorInfoBean() throws Exception;    
  
}