开启多线程

在service层直接在方法上注解开启

@Async("getyourPool")

准备配置

@Configuration
@EnableAsync
@Slf4j
public class yourConfig {
    @Value("${thread.pool.keepAliveSeconds:300}")
    private int keepAliveSeconds;
    @Value("${thread.pool.maxPoolSize:12}")
    private int ingestionMaxPoolSize;
    @Value("${thread.pool.corePoolSize:4}")
    private int ingestionCorePoolSize;
    @Value("${thread.pool.queueCapacity:600}")
    private int ingestQueueCapacity;

    @Bean
    public ThreadPoolTaskExecutor getyourPool() {

        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(ingestionCorePoolSize);
        executor.setQueueCapacity(ingestQueueCapacity);
        executor.setMaxPoolSize(ingestionMaxPoolSize);
        executor.setKeepAliveSeconds(keepAliveSeconds);
        executor.setThreadNamePrefix("yourThreadPool-");
        executor.setWaitForTasksToCompleteOnShutdown(true);
        executor.setRejectedExecutionHandler((Runnable r, ThreadPoolExecutor exe) -> {
            log.warn("yourThreadPool-full!");
        });
        executor.initialize();
        return executor;
    }
}

setQueueCapacity

如果设置了600，如果你的任务很多 超过600个 
例如1000个下载任务，如果你设置了600，那么你的任务开启到600个，剩余的400个任务会默认直接丢失，不会返回，

要设置

executor.setRejectedExecutionHandler 设置为不丢弃就行，不然默认直接丢弃 

 

还有一个问题是调用

@Async("getyourPool")注解的方法的时，不能用同一个类里调用这个方法，必须是不同的类中调用，不然不起效