java获得CPU使用率,系统内存,虚拟机内存等情况(不用JNI)
?? 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;
??? }
??? String s1 = Bytes.substring(line, kmtidx, rocidx - 1).trim();
??? String s2 = Bytes.substring(line, umtidx, wocidx - 1).trim();
??? if (caption.equals("System Idle Process") || caption.equals("System")) {???? if (s1.length() > 0)
????? idletime += Long.valueOf(s1).longValue();
???? if (s2.length() > 0)
????? idletime += Long.valueOf(s2).longValue();
???? continue;
??? }
??? if (s1.length() > 0)
???? kneltime += Long.valueOf(s1).longValue();
??? if (s2.length() > 0)
???? usertime += Long.valueOf(s2).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");}
}
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.hmw.system.monitor;
/**
* byte操作类.
*/
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。
?
C:\WINDOWS\system32\wbem\wmic.exe process get UserModeTime
C:\WINDOWS\system32\wbem\wmic.exe process get ThreadCount
C:\WINDOWS\system32\wbem\wmic.exe process get ?UserModeTime
C:\WINDOWS\system32\wbem\wmic.exe process get ?WriteOperationCount
C:\WINDOWS\system32\wbem\wmic.exe process get ?
C:\WINDOWS\system32\wbem\wmic.exe process get ?
C:\WINDOWS\system32\wbem\wmic.exe process get ?
?
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