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怎么在SpringBoot中實現一個異步任務?相信很多沒有經驗的人對此束手無策,為此本文總結了問題出現的原因和解決方法,通過這篇文章希望你能解決這個問題。
步驟,如圖所示:
1.添加異步任務業務類
package top.ytheng.demo.task; import java.util.concurrent.Future; import org.springframework.scheduling.annotation.Async; import org.springframework.scheduling.annotation.AsyncResult; import org.springframework.stereotype.Component; //異步任務業務類 @Component //標記此類是異步類,也可在方法中標記 //不加,則類里面的方法為同步執行 @Async public class AsyncTask { public void task1() throws InterruptedException { long begin = System.currentTimeMillis(); Thread.sleep(1000); long end = System.currentTimeMillis(); System.out.println("任務1耗時:" + (end - begin)); } public void task2() throws InterruptedException { long begin = System.currentTimeMillis(); Thread.sleep(2000); long end = System.currentTimeMillis(); System.out.println("任務2耗時:" + (end - begin)); } public void task3() throws InterruptedException { long begin = System.currentTimeMillis(); Thread.sleep(3000); long end = System.currentTimeMillis(); System.out.println("任務3耗時:" + (end - begin)); } //測試拿到返回結果 public Future<String> task4() throws InterruptedException { long begin = System.currentTimeMillis(); Thread.sleep(1000); long end = System.currentTimeMillis(); System.out.println("任務4耗時:" + (end - begin)); return new AsyncResult<String>("任務4"); } public Future<String> task5() throws InterruptedException { long begin = System.currentTimeMillis(); Thread.sleep(2000); long end = System.currentTimeMillis(); System.out.println("任務5耗時:" + (end - begin)); return new AsyncResult<String>("任務5"); } public Future<String> task6() throws InterruptedException { long begin = System.currentTimeMillis(); Thread.sleep(3000); long end = System.currentTimeMillis(); System.out.println("任務6耗時:" + (end - begin)); return new AsyncResult<String>("任務6"); } }
2.添加測試控制器
package top.ytheng.demo.controller; import java.util.concurrent.ExecutionException; import java.util.concurrent.Future; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import top.ytheng.demo.task.AsyncTask; @RestController @RequestMapping("api/v1/async") public class TaskController { @Autowired private AsyncTask asyncTask; @GetMapping("/test") public Object test() throws InterruptedException, ExecutionException { long begin = System.currentTimeMillis(); //asyncTask.task1(); //asyncTask.task2(); //asyncTask.task3(); Future<String> result1 = asyncTask.task4(); Future<String> result2 = asyncTask.task5(); Future<String> result3 = asyncTask.task6(); System.out.println("返回結果:" + result1.get() + "," + result2.get() + "," + result3.get()); for(;;) { if(result1.isDone() && result2.isDone() && result3.isDone()) { break; } } long end = System.currentTimeMillis(); long total = end - begin; System.out.println("總耗時:" + total); return "總耗時:" + total; } }
3.添加啟動類
package top.ytheng.demo; import org.mybatis.spring.annotation.MapperScan; import org.springframework.scheduling.annotation.EnableAsync; import org.springframework.scheduling.annotation.EnableScheduling; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.boot.web.servlet.ServletComponentScan; @SpringBootApplication //等于下面3個 //@SpringBootConfiguration //@EnableAutoConfiguration //@ComponentScan //攔截器用到 @ServletComponentScan //MyBatis用到 @MapperScan("top.ytheng.demo.mapper") //定時使用(開啟定時任務) @EnableScheduling //開啟異步任務 @EnableAsync public class DemoApplication { public static void main(String[] args) { SpringApplication.run(DemoApplication.class, args); } }
4.右鍵項目Run As啟動,訪問url
http://localhost:8080/api/v1/async/test
結果:
看完上述內容,你們掌握怎么在SpringBoot中實現一個異步任務的方法了嗎?如果還想學到更多技能或想了解更多相關內容,歡迎關注億速云行業資訊頻道,感謝各位的閱讀!
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