public static void main(String[] args) {
  Long startTime = System.currentTimeMillis();
  // 你的業(yè)務代碼
  Long endTime = System.currentTimeMillis();
  Long elapsedTime = (endTime - startTime) / 1000;
  System.out.println("該段總共耗時：" + elapsedTime + "s");
}

<!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-core</artifactId>
    <version>${spring.version}</version>
</dependency>

public static void main(String[] args) throws InterruptedException {
    StopWatch stopWatch = new StopWatch();

    // 任務一模擬休眠3秒鐘
    stopWatch.start("TaskOneName");
    Thread.sleep(1000 * 3);
    System.out.println("當前任務名稱：" + stopWatch.currentTaskName());
    stopWatch.stop();

    // 任務一模擬休眠10秒鐘
    stopWatch.start("TaskTwoName");
    Thread.sleep(1000 * 10);
    System.out.println("當前任務名稱：" + stopWatch.currentTaskName());
    stopWatch.stop();

    // 任務一模擬休眠10秒鐘
    stopWatch.start("TaskThreeName");
    Thread.sleep(1000 * 10);
    System.out.println("當前任務名稱：" + stopWatch.currentTaskName());
    stopWatch.stop();

    // 打印出耗時
    System.out.println(stopWatch.prettyPrint());
    System.out.println(stopWatch.shortSummary());
    // stop后它的值為null
    System.out.println(stopWatch.currentTaskName()); 
    
    // 最后一個任務的相關(guān)信息
    System.out.println(stopWatch.getLastTaskName());
    System.out.println(stopWatch.getLastTaskInfo());
    
    // 任務總的耗時  如果你想獲取到每個任務詳情（包括它的任務名、耗時等等）可使用
    System.out.println("所有任務總耗時：" + sw.getTotalTimeMillis());
    System.out.println("任務總數(shù)：" + sw.getTaskCount());
    System.out.println("所有任務詳情：" + sw.getTaskInfo());
}

public class StopWatch {
    /**
	 * 本實例的唯一 Id，用于在日志或控制臺輸出時區(qū)分的。
	 */
    private final String id;
    /**
	 * 是否保持一個 taskList 鏈表
	 * 每次停止計時時，會將當前任務放入這個鏈表，用以記錄任務鏈路和計時分析
	 */
	private boolean keepTaskList = true;
   /**
	 * 任務鏈表
	 * 用來存儲每個task的信息, taskInfo由taskName 和 totoalTime組成
	 */
    private final List<StopWatch.TaskInfo> taskList;
    /**
	 * 當前任務的開始時間
	 */
    private long startTimeMillis;
    /**
	 * 
	 */
    private boolean running;
    /**
	 * 當前任務名稱
	 */
    private String currentTaskName;
    /**
	 * 最后一個任務的信息
	 */
    private StopWatch.TaskInfo lastTaskInfo;
    /**
	 * 任務總數(shù)
	 */
    private int taskCount;
    /**
	 * 程序執(zhí)行時間
	 */
    private long totalTimeMillis;
    ...
}

<!-- https://mvnrepository.com/artifact/org.apache.commons/commons-lang3 -->
<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-lang3</artifactId>
    <version>3.6</version>
</dependency>

public static void main(String[] args) throws InterruptedException {
    //創(chuàng)建后立即start，常用
    StopWatch watch = StopWatch.createStarted();

    // StopWatch watch = new StopWatch();
    // watch.start();

    Thread.sleep(1000);
    System.out.println(watch.getTime());
    System.out.println("統(tǒng)計從開始到現(xiàn)在運行時間：" + watch.getTime() + "ms");

    Thread.sleep(1000);
    watch.split();
    System.out.println("從start到此刻為止的時間：" + watch.getTime());
    System.out.println("從開始到第一個切入點運行時間：" + watch.getSplitTime());


    Thread.sleep(1000);
    watch.split();
    System.out.println("從開始到第二個切入點運行時間：" + watch.getSplitTime());

    // 復位后, 重新計時
    watch.reset();
    watch.start();
    Thread.sleep(1000);
    System.out.println("重新開始后到當前運行時間是：" + watch.getTime());

    // 暫停 與 恢復
    watch.suspend();
    System.out.println("暫停2秒鐘");
    Thread.sleep(2000);

    // 上面suspend，這里要想重新統(tǒng)計，需要恢復一下
    watch.resume();
    System.out.println("恢復后執(zhí)行的時間是：" + watch.getTime());

    Thread.sleep(1000);
    watch.stop();

    System.out.println("花費的時間》》" + watch.getTime() + "ms");
    // 直接轉(zhuǎn)成s
    System.out.println("花費的時間》》" + watch.getTime(TimeUnit.SECONDS) + "s");
}

long start = System.currentTimeMillis();      
......業(yè)務處理
System.out.println("耗時:" + (System.currentTimeMillis() - start) + "ms");

public static void main(String[] args) throws InterruptedException{

        StopWatch stopWatch = new StopWatch("任務耗時秒表工具");

        stopWatch.start("task1");
        Thread.sleep(1000);
        stopWatch.stop();
        System.out.println(stopWatch.getTotalTimeMillis());
        stopWatch.start("task2");
        Thread.sleep(3000);
        stopWatch.stop();
        //所有任務耗時時間
        System.out.println(stopWatch.getTotalTimeMillis());
        System.out.println(stopWatch.prettyPrint());

        StopWatch stopWatch2 = new StopWatch("任務耗時秒表工具2");
        stopWatch2.start("task3");
        Thread.sleep(3000);
        stopWatch2.stop();
        //所有任務耗時時間
        System.out.println(stopWatch2.getTotalTimeMillis());
        System.out.println(stopWatch2.prettyPrint());

    }