文章目錄

• • • • • • 1. 啟動類添加@EnableAsync注解
          • 2. 異步方法添加@Async注解
          • 3. 自定義線程池以及線程池異常策略

1. 啟動類添加@EnableAsync注解

package com.gblfy;import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.scheduling.annotation.EnableAsync;@EnableAsync @SpringBootApplication public class JavaEscapeApplication {public static void main(String[] args) {SpringApplication.run(JavaEscapeApplication.class, args);}}

2. 異步方法添加@Async注解

package com.gblfy.async_task;import lombok.extern.slf4j.Slf4j; import org.springframework.scheduling.annotation.Async; import org.springframework.scheduling.annotation.AsyncResult; import org.springframework.stereotype.Service;import java.util.concurrent.Future;@Slf4j @Service public class AsyncService {@Asyncpublic void asyncProcess01() throws Exception {log.info("AsyncService Start to asyncProcess01 ->{}", Thread.currentThread().getName());Thread.sleep(2000);log.info("AsyncService Start to asyncProcess01 ->{}", Thread.currentThread().getName());}@Asyncpublic Future<String> asyncProcess02() throws Exception {log.info("AsyncService Start to asyncProcess02->{}", Thread.currentThread().getName());Thread.sleep(2000);log.info("AsyncService Done to asyncProcess02->{}", Thread.currentThread().getName());return new AsyncResult<>("imooc");}@Asyncpublic void asyncProcess03() {log.info("AsyncService Start to asyncProcess03->{}", Thread.currentThread().getName());throw new RuntimeException("throw exception asyncProcess03");} }

3. 自定義線程池以及線程池異常策略

package com.gblfy.async_task;import lombok.extern.slf4j.Slf4j; import org.springframework.aop.interceptor.AsyncUncaughtExceptionHandler; import org.springframework.context.annotation.Configuration; import org.springframework.scheduling.annotation.AsyncConfigurer; import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;import java.lang.reflect.Method; import java.util.Arrays; import java.util.concurrent.Executor; import java.util.concurrent.ThreadPoolExecutor;/*** 自定義異步任務線程池*/ @Slf4j @Configuration public class AsyncTaskConfig implements AsyncConfigurer {@Overridepublic Executor getAsyncExecutor() {ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();executor.setThreadNamePrefix("cmiip-");executor.setCorePoolSize(15);executor.setMaxPoolSize(20);executor.setKeepAliveSeconds(5);executor.setQueueCapacity(100);executor.setRejectedExecutionHandler(new ThreadPoolExecutor.AbortPolicy());executor.setWaitForTasksToCompleteOnShutdown(true);executor.setAwaitTerminationSeconds(60);executor.initialize();return executor;}@Overridepublic AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {return new AsyncUncaughtExceptionHandler() {@Overridepublic void handleUncaughtException(Throwable ex, Method method, Object... params) {// 報警郵件，發短信等等log.error("async task some Error: {} ,{} , {}", ex.getMessage(),method.getDeclaringClass().getName() + "." + method.getName(),Arrays.toString(params));}};} }

測試

package com.gblfy.async_task;import lombok.extern.slf4j.Slf4j; import org.junit.jupiter.api.Test; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context.SpringBootTest;import java.util.concurrent.Future; import java.util.concurrent.TimeUnit;@Slf4j @SpringBootTest class AsyncServiceTest {@Autowiredprivate AsyncService asyncService;@Testvoid contextLoads() throws Exception { // asyncService.asyncProcess01();Future<String> future= asyncService.asyncProcess02();log.info("Async Process02 return :->{}", future.get(1, TimeUnit.SECONDS));}@Testvoid contextLoads2() throws Exception {asyncService.asyncProcess03();Thread.sleep(3000);} }

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