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 {@Asyncpublic 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1HRedisUtils.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*/@Overridepublic Executor getAsyncExecutor() {return scheduledExecutorService;}/*** 异步执行异常处理*/@Overridepublic 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;@Autowiredprivate 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()) {@Overrideprotected 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