@Async的实现类方式

详解: 用于开启异步处理的接口, @Async,使用异步必须再启动类加上@EnableAsync

方法1:实现接口AsyncConfigurer

@Configuration
public class ThreadConfiguration implements AsyncConfigurer {

    private Logger logger = LoggerFactory.getLogger(this.getClass());

    private final ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();

    @Bean
    public Executor getAsyncExecutor() {
        executor.setThreadNamePrefix("Zy-TaskExecutor-");
        executor.setCorePoolSize(50);// 核心线程池大小
        executor.setMaxPoolSize(200);// 最大可创建的线程数
        executor.setQueueCapacity(1000);// 队列最大长度
        executor.setKeepAliveSeconds(300);// 线程池维护线程所允许的空闲时间
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        executor.initialize();
        logger.info("任务线程池初始化...");
        return executor;
    }

    /**
     * 只有在方法上添加@Async的出现异常才会跳到此方法中
     * */
    @Override
    public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
        logger.error("线程执行出现异常....");
        return (e, method, arguments) -> logger.error("exception method : " + method.getName() + " message:" + e.getMessage(), e);
    }

    /**
     * 线程监控类,访问/monitor
     * */
    @Bean
    public ServletRegistrationBean threadPoolMonitorServlet() {
        ServletRegistrationBean registration = new ServletRegistrationBean(new HttpServlet() {
            @Override
            protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
                resp.setContentType(MediaType.APPLICATION_JSON_UTF8_VALUE);
                PrintWriter writer = resp.getWriter();
                writer.print("corePoolSize : " + executor.getCorePoolSize());
                writer.flush();
                writer.close();
            }
        });
        registration.addUrlMappings("/monitor/*");
        logger.info("springboot线程监控start!");
        return registration;
    }
}

方法2:直接注入bean

@Bean
    public ThreadPoolTaskExecutor threadPoolTaskExecutor(){
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setMaxPoolSize(200);
        executor.setQueueCapacity(1000);
        executor.setCorePoolSize(50);
        executor.setKeepAliveSeconds(300);
        executor.setThreadNamePrefix("Zy-TaskExecutor-");
        // 线程池对拒绝任务(无线程可用)的处理策略
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        executor.initialize();
        log.info("任务线程池初始化...");
        return executor;
    }