Java获取系统CPU,磁盘占比,内存占比(系统自身监控状态)
系统自身监控状态
突然心血来潮写一个这个文章，之前本来打算一天一更的，但是工作原因，搞得一直加班.....(算了，不想碎碎念了，只是把这个记录下来，方便以后自己回头看看。)
利用oshi工具获取信息
本来吧，按理说是可以直接用的，但是开发环境是1.7的，结果不能直接弄，最终别人的帮助下改了一下套进了系统中最终跑起来了。
Java原生代码实现cpu，磁盘等数据占比
但是这个有一个缺点，就是本身获取的速度会很慢，请求接口的话，大概会有34s，<mark>所以慎重选择</mark>。
//获得cpu使用率：原生代码，响应时间大概30s
public static String 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) * 1.0 / (busytime + idletime)).intValue();
} else {
return "" + 0 ;
}
} catch (Exception ex) {
ex.printStackTrace();
return "" + 0 ;
}
}
private static long[] readCpu(final Process proc) {
// TODO Auto-generated method stub
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 =substring(line, capidx, cmdidx - 1).trim();
String cmd = substring(line, cmdidx, kmtidx - 1).trim();
if (cmd.indexOf("wmic.exe") >= 0) {
continue;
}
String s1 = substring(line, kmtidx, rocidx - 1).trim();
String s2 = 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;
}
/** * 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 */
private 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;
}
public static String getMemery() {
OperatingSystemMXBean osmxb = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();
// 总的物理内存+虚拟内存
long totalvirtualMemory = osmxb.getTotalSwapSpaceSize();
// 剩余的物理内存
long freePhysicalMemorySize = osmxb.getFreePhysicalMemorySize();
Double compare = (Double) (1 - freePhysicalMemorySize * 1.0 / totalvirtualMemory) * 100;
String str = "" + compare.intValue();
return str;
}
利用第三方工具获取
很简单，导入然后套娃就可以了。
// oshi获取cpu数据，不支持低版本
public static String getCpu() throws Exception{
SystemInfo systemInfo = new SystemInfo();
CentralProcessor processor = systemInfo.getHardware().getProcessor();
long[] prevTicks = processor.getSystemCpuLoadTicks();
// 睡眠1s
TimeUnit.SECONDS.sleep(1);
long[] ticks = processor.getSystemCpuLoadTicks();
long nice = ticks[CentralProcessor.TickType.NICE.getIndex()] - prevTicks[CentralProcessor.TickType.NICE.getIndex()];
long irq = ticks[CentralProcessor.TickType.IRQ.getIndex()] - prevTicks[CentralProcessor.TickType.IRQ.getIndex()];
long softirq = ticks[CentralProcessor.TickType.SOFTIRQ.getIndex()] - prevTicks[CentralProcessor.TickType.SOFTIRQ.getIndex()];
long steal = ticks[CentralProcessor.TickType.STEAL.getIndex()] - prevTicks[CentralProcessor.TickType.STEAL.getIndex()];
long cSys = ticks[CentralProcessor.TickType.SYSTEM.getIndex()] - prevTicks[CentralProcessor.TickType.SYSTEM.getIndex()];
long user = ticks[CentralProcessor.TickType.USER.getIndex()] - prevTicks[CentralProcessor.TickType.USER.getIndex()];
long iowait = ticks[CentralProcessor.TickType.IOWAIT.getIndex()] - prevTicks[CentralProcessor.TickType.IOWAIT.getIndex()];
long idle = ticks[CentralProcessor.TickType.IDLE.getIndex()] - prevTicks[CentralProcessor.TickType.IDLE.getIndex()];
long totalCpu = user + nice + cSys + idle + iowait + irq + softirq + steal;
String s = new DecimalFormat("#.##%").format(1-(idle * 1.0 / totalCpu));
String newString = s.replace("%", "");
return newString;
}
//获取内存使用率
public static String getMemery(){
SystemInfo systemInfo = new SystemInfo();
GlobalMemory memory = systemInfo.getHardware().getMemory();
//总内存
long totalByte = memory.getTotal();
//剩余
long acaliableByte = memory.getAvailable();
String string = new DecimalFormat("#.##%").format((totalByte-acaliableByte)*1.0/totalByte);
String newString = string.replace("%", "");
return newString;
}
悟已往之不谏知来者之可追。
