SpringBoot使用@Async注解，实现异步任务

1.直接在方法上加@Async注解，标明为异步任务：

@Component
public class MyAsyncTask {
     @Async
    public void asyncImportTask(String jsonList){
        //...具体业务逻辑
        //从redis缓存中查询数据(使用若依框架自带的redis方法)
        Data redisData = RedisUtils.getCacheObject(DataEnum.NUMONE.getValue());
        if(ObjectUtil.isEmpty(redisData)){
            //将数据查询后存入redis缓存1H
            RedisUtils.setCacheObject(DataEnum.NUMONE.getValue(), Data, Duration.ofHours(1));
        }
    }
}

2.设置默认的Async的线程，且开启异步配置，即配置上@EnableAsync注解：

@EnableAsync(proxyTargetClass = true)
@Configuration
public class AsyncConfig extends AsyncConfigurerSupport {

    @Autowired
    @Qualifier("scheduledExecutorService")
    private ScheduledExecutorService scheduledExecutorService;

    /**
     * 自定义 @Async 注解使用系统线程池
     */
    @Override
    public Executor getAsyncExecutor() {
        return scheduledExecutorService;
    }

    /**
     * 异步执行异常处理
     */
    @Override
    public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
        return (throwable, method, objects) -> {
            throwable.printStackTrace();
            StringBuilder sb = new StringBuilder();
            sb.append("Exception message - ").append(throwable.getMessage())
                .append(", Method name - ").append(method.getName());
            if (ArrayUtil.isNotEmpty(objects)) {
                sb.append(", Parameter value - ").append(Arrays.toString(objects));
            }
            throw new ServiceException(sb.toString());
        };
    }
}

3.使用的线程池相关配置：

//线程池配置
@Configuration
public class ThreadPoolConfig {

    /**
     * 核心线程数 = cpu 核心数 + 1
     */
    private final int core = Runtime.getRuntime().availableProcessors() + 1;

    @Autowired
    private ThreadPoolProperties threadPoolProperties;

    @Bean(name = "threadPoolTaskExecutor")
    @ConditionalOnProperty(prefix = "thread-pool", name = "enabled", havingValue = "true")
    public ThreadPoolTaskExecutor threadPoolTaskExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(core);
        executor.setMaxPoolSize(core * 2);
        executor.setQueueCapacity(threadPoolProperties.getQueueCapacity());
        executor.setKeepAliveSeconds(threadPoolProperties.getKeepAliveSeconds());
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        return executor;
    }

    /**
     * 执行周期性或定时任务
     */
    @Bean(name = "scheduledExecutorService")
    protected ScheduledExecutorService scheduledExecutorService() {
        return new ScheduledThreadPoolExecutor(core,
            new BasicThreadFactory.Builder().namingPattern("schedule-pool-%d").daemon(true).build(),
            new ThreadPoolExecutor.CallerRunsPolicy()) {
            @Override
            protected void afterExecute(Runnable r, Throwable t) {
                super.afterExecute(r, t);
                Threads.printException(r, t);
            }
        };
    }
}

4.线程池配置属性

//线程池配置属性
@Data
@Component
@ConfigurationProperties(prefix = "thread-pool")
public class ThreadPoolProperties {

    /**
     * 是否开启线程池
     */
    private boolean enabled;

    /**
     * 队列最大长度
     */
    private int queueCapacity;

    /**
     * 线程池维护线程所允许的空闲时间
     */
    private int keepAliveSeconds;

}

5.系统全局线程池配置

# 全局线程池相关配置
thread-pool:
  # 是否开启线程池
  enabled: true
  # 队列最大长度
  queueCapacity: 256
  # 线程池维护线程所允许的空闲时间
  keepAliveSeconds: 300

注意：调用被@Async注解的方法时，调用方法不能与被调用方法放在同一类中，否则注解不生效