统计耗时 System.currentTimeMillis()

一、Spring的StopWatch

1、pom

<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-core</artifactId>
	<version>5.3.6</version>
</dependency>
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2、代码示例

 org.springframework.util.StopWatch stopWatch = new org.springframework.util.StopWatch();
 stopWatch.start("任务1");
 System.out.println("开始任务1");
 Thread.sleep(1000 * 3);
 System.out.println("结束任务1");
 stopWatch.stop();

 stopWatch.start("任务2");
 System.out.println("开始任务2");
 Thread.sleep(1000 * 3);
 System.out.println("结束任务2");
 stopWatch.stop();

 stopWatch.start("任务3");
 System.out.println("开始任务3");
 Thread.sleep(1000 * 3);
 System.out.println("结束任务3");
 stopWatch.stop();

 System.out.println("总任务数：" + stopWatch.getTaskCount());
 System.out.println("总耗时：" + stopWatch.getTotalTimeMillis());
 System.out.println("每个任务具体信息：" + JSONArray.toJSONString(stopWatch.getTaskInfo()));
  log.info("总任务数:{}  总耗时:{}  具体耗时信息:{}", stopWatch.getTaskCount(), stopWatch.getTotalTimeMillis(), JSONArray.toJSONString(stopWatch.getTaskInfo()));
  
log.info(stopWatch.prettyPrint());
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二、apache的StopWatch

1、pom依赖

<dependency>
	<groupId>org.apache.commons</groupId>
	<artifactId>commons-lang3</artifactId>
	<version>3.6</version>
</dependency>
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2、代码示例

StopWatch stopWatch = StopWatch.createStarted();
System.out.println("开始任务1");
Thread.sleep(1000 * 3);
System.out.println("结束任务1");
System.out.println("任务1耗时：" + stopWatch.getTime());

stopWatch.split();
System.out.println("开始任务2");
Thread.sleep(1000 * 3);
System.out.println("结束任务2");
System.out.println("任务2耗时：" + stopWatch.getSplitTime());
System.out.println("总耗时：" + stopWatch.getTime());

stopWatch.split();
System.out.println("开始任务3");
Thread.sleep(1000 * 3);
System.out.println("结束任务3");
System.out.println("任务3耗时：" + stopWatch.getSplitTime());
System.out.println("总耗时：" + stopWatch.getTime());
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