Spring Boot异步任务，必须在Application配置以下信息。
1. @EnableAsync
2. 注册名为taskExecutor的Bean：
@Bean(name="taskExecutor")
public TaskExecutor workExecutor() {
ThreadPoolTaskExecutor threadPoolTaskExecutor = new ThreadPoolTaskExecutor();
threadPoolTaskExecutor.setThreadNamePrefix("Async-");
threadPoolTaskExecutor.setCorePoolSize(3);
threadPoolTaskExecutor.setMaxPoolSize(3);
threadPoolTaskExecutor.setQueueCapacity(600);
threadPoolTaskExecutor.afterPropertiesSet();
logger.info("ThreadPoolTaskExecutor set");
return threadPoolTaskExecutor;
}
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