Java计时新姿势
- 2019 年 10 月 3 日
- 筆記
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?????StopWatch????????????!
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??????????????????????????????????????????????????????????? Java ????????????????????
public static void main(String[] args) { Long startTime = System.currentTimeMillis(); doSomeThing(); Long endTime = System.currentTimeMillis(); Long elapsedTime = (endTime - startTime) / 1000; System.out.println("?????" + elapsedTime + "s"); } // ???????? private static void doSomeThing() { try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } }??????????????????????????????????????????????????????????????????????
??StopWatch ?
?????????????? Maven ??? Spring ?????? Spring MVC ? Spring Boot ???????????
<!-- spring??? --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>${spring.version}</version> </dependency>????????????????????
public static void main(String[] args) { StopWatch clock = new StopWatch(); clock.start("?????"); doSomeThing(); clock.stop(); clock.start("?????"); doSomeThing(); clock.stop(); System.out.println(clock.prettyPrint()); } // ???????? private static void doSomeThing() { try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } }??????? StopWatch ???? prettyPrint() ?????????????????????????????????
StopWatch '': running time (millis) = 2009 ----------------------------------------- ms % Task name ----------------------------------------- 01005 050% ????? 01004 050% ???????????????????????????????????????????????????????
StopWatch ?????????
???? StopWatch ??????????? 200 ?????????????
public void start(String taskName) throws IllegalStateException { if (this.currentTaskName != null) { throw new IllegalStateException("Can't start StopWatch: it's already running"); } else { this.currentTaskName = taskName; this.startTimeMillis = System.currentTimeMillis(); } } public void stop() throws IllegalStateException { if (this.currentTaskName == null) { throw new IllegalStateException("Can't stop StopWatch: it's not running"); } else { long lastTime = System.currentTimeMillis() - this.startTimeMillis; this.totalTimeMillis += lastTime; this.lastTaskInfo = new StopWatch.TaskInfo(this.currentTaskName, lastTime); if (this.keepTaskList) { this.taskList.add(this.lastTaskInfo); } ++this.taskCount; this.currentTaskName = null; } }???????? LinkedList ??????? taskList ????????????????? System.currentTimeMillis() ????????????????????????????? TaskInfo ???????? taskList ????
??? prettyPrint() ???????? taskList ?????????????????????
public String shortSummary() { return "StopWatch '" + this.getId() + "': running time (millis) = " + this.getTotalTimeMillis(); } public String prettyPrint() { StringBuilder sb = new StringBuilder(this.shortSummary()); sb.append('n'); if (!this.keepTaskList) { sb.append("No task info kept"); } else { sb.append("-----------------------------------------n"); sb.append("ms % Task namen"); sb.append("-----------------------------------------n"); NumberFormat nf = NumberFormat.getNumberInstance(); nf.setMinimumIntegerDigits(5); nf.setGroupingUsed(false); NumberFormat pf = NumberFormat.getPercentInstance(); pf.setMinimumIntegerDigits(3); pf.setGroupingUsed(false); StopWatch.TaskInfo[] var4 = this.getTaskInfo(); int var5 = var4.length; for(int var6 = 0; var6 < var5; ++var6) { StopWatch.TaskInfo task = var4[var6]; sb.append(nf.format(task.getTimeMillis())).append(" "); sb.append(pf.format(task.getTimeSeconds() / this.getTotalTimeSeconds())).append(" "); sb.append(task.getTaskName()).append("n"); } } return sb.toString(); }????? get ??
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