@Service
public class TestAsyncService {
  public void testAsync() throws Exception {
    test();
  }
  @Async
  public void test() throws InterruptedException{
    Thread.sleep(10000);//讓線程休眠，根據(jù)輸出結(jié)果判斷主線程和從線程是同步還是異步
    System.out.println("異步threadId:"+Thread.currentThread().getId());
  }
}

@Service  
class A{  
    @Async
    method b(){...}  
    method a(){    //標(biāo)記1  
        b();  
    }  
}  
//Spring掃描注解后，創(chuàng)建了另外一個(gè)代理類，并為有注解的方法加上異步效果  
class proxy$A{  
    A objectA = new A();  
    method b(){    //標(biāo)記2  
        //異步執(zhí)行Async  
        objectA.b();  
    }  
    method a(){    //標(biāo)記3  
        objectA.a();    //由于a()沒(méi)有注解，所以不會(huì)異步執(zhí)行，而是直接調(diào)用A的實(shí)例的a()方法  
    }  
}  

@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);// 核心線程池大小
        executor.setMaxPoolSize(200);// 最大可創(chuàng)建的線程數(shù)
        executor.setQueueCapacity(1000);// 隊(duì)列最大長(zhǎng)度
        executor.setKeepAliveSeconds(300);// 線程池維護(hù)線程所允許的空閑時(shí)間
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        executor.initialize();
        logger.info("任務(wù)線程池初始化...");
        return executor;
    }
    /**
     * 只有在方法上添加@Async的出現(xiàn)異常才會(huì)跳到此方法中
     * */
    @Override
    public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
        logger.error("線程執(zhí)行出現(xiàn)異常....");
        return (e, method, arguments) -> logger.error("exception method : " + method.getName() + " message:" + e.getMessage(), e);
    }
    /**
     * 線程監(jiān)控類,訪問(wèn)/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線程監(jiān)控start!");
        return registration;
    }
}

@Bean
    public ThreadPoolTaskExecutor threadPoolTaskExecutor(){
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setMaxPoolSize(200);
        executor.setQueueCapacity(1000);
        executor.setCorePoolSize(50);
        executor.setKeepAliveSeconds(300);
        executor.setThreadNamePrefix("Zy-TaskExecutor-");
        // 線程池對(duì)拒絕任務(wù)(無(wú)線程可用)的處理策略
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        executor.initialize();
        log.info("任務(wù)線程池初始化...");
        return executor;
    }