Java-执行耗时

System.currentTimeMillis()

long start = System.currentTimeMillis();

// 业务代码

long finish = System.currentTimeMillis();
long timeElapsed = finish - start;

System.nanoTime()

long start = System.nanoTime();

// 业务代码

long finish = System.nanoTime();
long timeElapsed = finish - start;

java8 Instant.now()

Instant start = Instant.now();

// 业务代码

Instant finish = Instant.now();
long timeElapsed = Duration.between(start, finish).toMillis();

apache.commons StopWatch

1. pom.xml

   <dependency>
       <groupId>org.apache.commons</groupId>
       <artifactId>commons-lang3</artifactId>
       <version>3.7</version>
   </dependency>

2. 使用

   import org.apache.commons.lang3.time.StopWatch;
   
   StopWatch watch = new StopWatch();
   watch.start();
   
   // 业务代码
   
   watch.stop();
   System.out.println("Time Elapsed: " + watch.getTime());

Spring StopWatch

import org.springframework.util.StopWatch;
 
StopWatch watch = new StopWatch();
watch.start("watcher");
 
// 业务代码
 
watch.stop();
System.out.println(watch.prettyPrint());