spring boot中多線程和並發編程的實現

Spring中通過任務執行器TaskExecutor來實現多線程和並發編程。
使用ThreadPoolTaskExecutor可實現一個基於線程池的TaskExecutor。
因為實際開發中任務一般是異步的（即非阻塞的），所以要在配置類中@EnableAsync ，並在實際執行的Bean方法中使用@Async來聲明這是一個異步方法。

配置類的實現：

@Configuration
@ComponentScan("com.prac.spring.task_executor")
@EnableAsync //開啟異步任務支持
public class TaskExecutorConfig implements AsyncConfigurer {
    //配置類繼承AsyncConfigurer接口並重寫getAsyncExecutor方法，並返回ThreadPoolTaskExecutor，
    //這樣我們就獲得了一個基於線程池TaskExecutor
    @Override
    public Executor getAsyncExecutor(){
        ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
        taskExecutor.setCorePoolSize(10);
        taskExecutor.setMaxPoolSize(15);
        taskExecutor.setQueueCapacity(30);
        taskExecutor.initialize();
        return taskExecutor;
    }

    /**
     * AsyncUncaughtExceptionHandler：用來處理從異步方法拋出的未被捕獲的exceptions
     * An asynchronous method usually returns a Future instance that gives access to the underlying exception. When the method does not provide that return type, this handler can be used to managed such uncaught exceptions.
     */
    @Override
    public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler(){
        return null;

    }

}