多线程解析报表

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假如有这样一个需求，当我们需要解析一个Excel里多个sheet的数据时，可以考虑使用多线程，每个线程解析一个sheet里的数据，等到所有的sheet都解析完之后，程序需要提示解析完成。

Way1

join

import java.time.LocalTime;

public class Main {

    public static void main(String[] args) throws InterruptedException {
        Thread sheet1 = new Thread(new Runnable() {
            @Override
            public void run() {
                System.out.println(LocalTime.now() + " sheet1 begin");
                try {
                    Thread.sleep(5000);
                } catch (InterruptedException e) {
                }
                System.out.println(LocalTime.now() + " sheet1 finish");
            }
        });

        Thread sheet2 = new Thread(new Runnable() {
            @Override
            public void run() {
                System.out.println(LocalTime.now() + " sheet2 begin");
                try {
                    Thread.sleep(10000);
                } catch (InterruptedException e) {
                }
                System.out.println(LocalTime.now() + " sheet2 finish");
            }
        });
        System.out.println(LocalTime.now() + " all parser begin");
        sheet1.start();
        sheet2.start();
        sheet1.join();
        sheet2.join();
        System.out.print(LocalTime.now() + " all parser finish");
    }

}

Way2

CountDownLatch

import java.time.LocalTime;
import java.util.concurrent.CountDownLatch;

public class Main {

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

        CountDownLatch latch =  new CountDownLatch(2);

        Thread sheet1 = new Thread(new Runnable() {
            @Override
            public void run() {
                System.out.println(LocalTime.now() + " sheet1 begin");
                try {
                    Thread.sleep(5000);
                } catch (InterruptedException e) {
                }
                System.out.println(LocalTime.now() + " sheet1 finish");
                latch.countDown(); ;
            }

        });

        Thread sheet2 = new Thread(new Runnable() {
            @Override
            public void run() {
                System.out.println(LocalTime.now() + " sheet2 begin");
                try {
                    Thread.sleep(10000);
                } catch (InterruptedException e) {
                }
                System.out.println(LocalTime.now() + " sheet2 finish");
                latch.countDown(); ;
            }
        });
        System.out.println(LocalTime.now() + " all parser begin");
        sheet1.start();
        sheet2.start();
        latch.await();
        System.out.print(LocalTime.now() + " all parser finish");
    }

}

python

import time
import threading

def sheet1():
    print(time.strftime("%H:%M:%S")+ " sheet1 begin")
    time.sleep(5)
    print(time.strftime("%H:%M:%S") + " sheet1 end")

def sheet2():
    print(time.strftime("%H:%M:%S")+ " sheet2 begin")
    time.sleep(10)
    print(time.strftime("%H:%M:%S") + " sheet2 end")

if __name__ == '__main__':
    print(time.strftime("%H:%M:%S") + " all parser begin")
    thread1 = threading.Thread(target=sheet1)
    thread2 = threading.Thread(target=sheet2)
    thread1.start()
    thread2.start()
    thread1.join()
    thread2.join()
    print(time.strftime("%H:%M:%S") + " all parser end")