线程异步的一种方法

Posted 2021-03-18 sjzxxy

1. ThreadPoolUtils 

import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

public class ThreadPoolUtils {
    private static volatile ThreadPoolExecutor pool = null;

    public static ThreadPoolExecutor getThreadPool() {
        if (pool == null) {
            synchronized (ThreadPoolUtils.class) {
                if (pool == null) {
                    pool = createPool(10, 100);
                }
            }
        }
        return pool;
    }

    /**
     * 创建线程池
     *
     * @param corePoolSize  核心线程数量
     * @param maxThreadSize 最大线程数
     * @return
     */
    private static ThreadPoolExecutor createPool(int corePoolSize, int maxThreadSize) {
        return new ThreadPoolExecutor(corePoolSize, maxThreadSize, 0,
                TimeUnit.SECONDS, new LinkedBlockingQueue<Runnable>());
    }
}

2. 使用线程池创建线程

            ThreadPoolExecutor threadPool = ThreadPoolUtils.getThreadPool();
            threadPool.submit(new Callable<Boolean>() {
                @Override
                public Boolean call() throws Exception {
                    return sendEmail("保险产品审核表",emails,"未审核的产品",is);
                }
            });

3. threadPool.submit()是可以获取返回结果的，call方法里返回的数据，

4. Feature feature = submit.get()

submit.get方法是一个阻塞方法，如果开启的线程内的逻辑没有处理完成，它会等开启的线程处理完成。