Java 关于操作系统
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 - c0; long busytime = c1 - c0; 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; 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 = idletime; retn = 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; } 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; }
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