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+# spring-boot-demo-async
+
+> 此 demo 主要演示了 Spring Boot 如何使用原生提供的异步任务支持，实现异步执行任务。
+
+## pom.xml
+
+```xml
+
+
+ 4.0.0
+
+ spring-boot-demo-async
+ 1.0.0-SNAPSHOT
+ jar
+
+ spring-boot-demo-async
+ Demo project for Spring Boot
+
+
+ com.xkcoding
+ spring-boot-demo
+ 1.0.0-SNAPSHOT
+
+
+
+ UTF-8
+ UTF-8
+ 1.8
+
+
+
+
+ org.springframework.boot
+ spring-boot-starter
+
+
+
+ org.springframework.boot
+ spring-boot-starter-test
+ test
+
+
+
+ org.projectlombok
+ lombok
+ true
+
+
+
+
+ spring-boot-demo-async
+
+
+ org.springframework.boot
+ spring-boot-maven-plugin
+
+
+
+
+
+```
+
+## application.yml
+
+```yaml
+spring:
+ task:
+ execution:
+ pool:
+ # 最大线程数
+ max-size: 16
+ # 核心线程数
+ core-size: 16
+ # 存活时间
+ keep-alive: 10s
+ # 队列大小
+ queue-capacity: 100
+ # 是否允许核心线程超时
+ allow-core-thread-timeout: true
+ # 线程名称前缀
+ thread-name-prefix: async-task-
+```
+
+## SpringBootDemoAsyncApplication.java
+
+```java
+/**
+ *
+ * 启动器
+ *
+ *
+ * @package: com.xkcoding.async
+ * @description: 启动器
+ * @author: yangkai.shen
+ * @date: Created in 2018-12-29 10:28
+ * @copyright: Copyright (c) 2018
+ * @version: V1.0
+ * @modified: yangkai.shen
+ */
+@EnableAsync
+@SpringBootApplication
+public class SpringBootDemoAsyncApplication {
+
+ public static void main(String[] args) {
+ SpringApplication.run(SpringBootDemoAsyncApplication.class, args);
+ }
+
+}
+```
+
+## TaskFactory.java
+
+```java
+/**
+ *
+ * 任务工厂
+ *
+ *
+ * @package: com.xkcoding.async.task
+ * @description: 任务工厂
+ * @author: yangkai.shen
+ * @date: Created in 2018-12-29 10:37
+ * @copyright: Copyright (c) 2018
+ * @version: V1.0
+ * @modified: yangkai.shen
+ */
+@Component
+@Slf4j
+public class TaskFactory {
+
+ /**
+ * 模拟5秒的异步任务
+ */
+ @Async
+ public Future asyncTask1() throws InterruptedException {
+ doTask("asyncTask1", 5);
+ return new AsyncResult<>(Boolean.TRUE);
+ }
+
+ /**
+ * 模拟2秒的异步任务
+ */
+ @Async
+ public Future asyncTask2() throws InterruptedException {
+ doTask("asyncTask2", 2);
+ return new AsyncResult<>(Boolean.TRUE);
+ }
+
+ /**
+ * 模拟3秒的异步任务
+ */
+ @Async
+ public Future asyncTask3() throws InterruptedException {
+ doTask("asyncTask3", 3);
+ return new AsyncResult<>(Boolean.TRUE);
+ }
+
+ /**
+ * 模拟5秒的同步任务
+ */
+ public void task1() throws InterruptedException {
+ doTask("task1", 5);
+ }
+
+ /**
+ * 模拟2秒的同步任务
+ */
+ public void task2() throws InterruptedException {
+ doTask("task2", 2);
+ }
+
+ /**
+ * 模拟3秒的同步任务
+ */
+ public void task3() throws InterruptedException {
+ doTask("task3", 3);
+ }
+
+ private void doTask(String taskName, Integer time) throws InterruptedException {
+ log.info("{}开始执行，当前线程名称【{}】", taskName, Thread.currentThread().getName());
+ TimeUnit.SECONDS.sleep(time);
+ log.info("{}执行成功，当前线程名称【{}】", taskName, Thread.currentThread().getName());
+ }
+}
+```
+
+## TaskFactoryTest.java
+
+```java
+/**
+ *
+ * 测试任务
+ *
+ *
+ * @package: com.xkcoding.async.task
+ * @description: 测试任务
+ * @author: yangkai.shen
+ * @date: Created in 2018-12-29 10:49
+ * @copyright: Copyright (c) 2018
+ * @version: V1.0
+ * @modified: yangkai.shen
+ */
+@Slf4j
+public class TaskFactoryTest extends SpringBootDemoAsyncApplicationTests {
+ @Autowired
+ private TaskFactory task;
+
+ /**
+ * 测试异步任务
+ */
+ @Test
+ public void asyncTaskTest() throws InterruptedException, ExecutionException {
+ long start = System.currentTimeMillis();
+ Future asyncTask1 = task.asyncTask1();
+ Future asyncTask2 = task.asyncTask2();
+ Future asyncTask3 = task.asyncTask3();
+
+ // 调用 get() 阻塞主线程
+ asyncTask1.get();
+ asyncTask2.get();
+ asyncTask3.get();
+ long end = System.currentTimeMillis();
+
+ log.info("异步任务全部执行结束，总耗时：{} 毫秒", (end - start));
+ }
+
+ /**
+ * 测试同步任务
+ */
+ @Test
+ public void taskTest() throws InterruptedException {
+ long start = System.currentTimeMillis();
+ task.task1();
+ task.task2();
+ task.task3();
+ long end = System.currentTimeMillis();
+
+ log.info("同步任务全部执行结束，总耗时：{} 毫秒", (end - start));
+ }
+}
+```
+
+## 运行结果
+
+### 异步任务
+
+```bash
+2018-12-29 10:57:28.511 INFO 3134 --- [ async-task-3] com.xkcoding.async.task.TaskFactory : asyncTask3开始执行，当前线程名称【async-task-3】
+2018-12-29 10:57:28.511 INFO 3134 --- [ async-task-1] com.xkcoding.async.task.TaskFactory : asyncTask1开始执行，当前线程名称【async-task-1】
+2018-12-29 10:57:28.511 INFO 3134 --- [ async-task-2] com.xkcoding.async.task.TaskFactory : asyncTask2开始执行，当前线程名称【async-task-2】
+2018-12-29 10:57:30.514 INFO 3134 --- [ async-task-2] com.xkcoding.async.task.TaskFactory : asyncTask2执行成功，当前线程名称【async-task-2】
+2018-12-29 10:57:31.516 INFO 3134 --- [ async-task-3] com.xkcoding.async.task.TaskFactory : asyncTask3执行成功，当前线程名称【async-task-3】
+2018-12-29 10:57:33.517 INFO 3134 --- [ async-task-1] com.xkcoding.async.task.TaskFactory : asyncTask1执行成功，当前线程名称【async-task-1】
+2018-12-29 10:57:33.517 INFO 3134 --- [ main] com.xkcoding.async.task.TaskFactoryTest : 异步任务全部执行结束，总耗时：5015 毫秒
+```
+
+### 同步任务
+
+```bash
+2018-12-29 10:55:49.830 INFO 3079 --- [ main] com.xkcoding.async.task.TaskFactory : task1开始执行，当前线程名称【main】
+2018-12-29 10:55:54.834 INFO 3079 --- [ main] com.xkcoding.async.task.TaskFactory : task1执行成功，当前线程名称【main】
+2018-12-29 10:55:54.835 INFO 3079 --- [ main] com.xkcoding.async.task.TaskFactory : task2开始执行，当前线程名称【main】
+2018-12-29 10:55:56.839 INFO 3079 --- [ main] com.xkcoding.async.task.TaskFactory : task2执行成功，当前线程名称【main】
+2018-12-29 10:55:56.839 INFO 3079 --- [ main] com.xkcoding.async.task.TaskFactory : task3开始执行，当前线程名称【main】
+2018-12-29 10:55:59.843 INFO 3079 --- [ main] com.xkcoding.async.task.TaskFactory : task3执行成功，当前线程名称【main】
+2018-12-29 10:55:59.843 INFO 3079 --- [ main] com.xkcoding.async.task.TaskFactoryTest : 同步任务全部执行结束，总耗时：10023 毫秒
+```
+
+## 参考
+
+- Spring Boot 异步任务线程池的配置 参考官方文档：https://docs.spring.io/spring-boot/docs/2.1.0.RELEASE/reference/htmlsingle/#boot-features-task-execution-scheduling
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