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這篇文章給大家介紹怎么在Spring boot中對多線程進行配置,內容非常詳細,感興趣的小伙伴們可以參考借鑒,希望對大家能有所幫助。
1、配置線程配置類
package test; import java.util.concurrent.Executor; import org.springframework.aop.interceptor.AsyncUncaughtExceptionHandler; import org.springframework.context.annotation.ComponentScan; import org.springframework.context.annotation.Configuration; import org.springframework.scheduling.annotation.AsyncConfigurer; import org.springframework.scheduling.annotation.EnableAsync; import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor; @Configuration @ComponentScan("test") @EnableAsync // 線程配置類 public class AsyncTaskConfig implements AsyncConfigurer { // ThredPoolTaskExcutor的處理流程 // 當池子大小小于corePoolSize,就新建線程,并處理請求 // 當池子大小等于corePoolSize,把請求放入workQueue中,池子里的空閑線程就去workQueue中取任務并處理 // 當workQueue放不下任務時,就新建線程入池,并處理請求,如果池子大小撐到了maximumPoolSize,就用RejectedExecutionHandler來做拒絕處理 // 當池子的線程數大于corePoolSize時,多余的線程會等待keepAliveTime長時間,如果無請求可處理就自行銷毀 @Override public Executor getAsyncExecutor() { ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor(); taskExecutor.setCorePoolSize(5);// 最小線程數 taskExecutor.setMaxPoolSize(10);// 最大線程數 taskExecutor.setQueueCapacity(25);// 等待隊列 taskExecutor.initialize(); return taskExecutor; } @Override public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() { return null; } }
2、定義線程執行任務類
package test; import java.util.Random; import java.util.concurrent.Future; import org.springframework.scheduling.annotation.Async; import org.springframework.scheduling.annotation.AsyncResult; import org.springframework.stereotype.Service; @Service // 線程執行任務類 public class AsyncTaskService { Random random = new Random();// 默認構造方法 @Async // 表明是異步方法 // 無返回值 public void executeAsyncTask(Integer i) { System.out.println("執行異步任務:" + i); } /** * 異常調用返回Future * * @param i * @return * @throws InterruptedException */ @Async public Future<String> asyncInvokeReturnFuture(int i) throws InterruptedException { System.out.println("input is " + i); Thread.sleep(1000 * random.nextInt(i)); Future<String> future = new AsyncResult<String>("success:" + i);// Future接收返回值,這里是String類型,可以指明其他類型 return future; } }
3、調用
package test; import java.util.ArrayList; import java.util.List; import java.util.concurrent.ExecutionException; import java.util.concurrent.Future; import org.springframework.context.annotation.AnnotationConfigApplicationContext; import org.springframework.core.task.TaskRejectedException; public class Application { public static void main(String[] args) throws InterruptedException, ExecutionException { // testVoid(); testReturn(); } // 測試無返回結果 private static void testVoid() { AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(AsyncTaskConfig.class); AsyncTaskService asyncTaskService = context.getBean(AsyncTaskService.class); // 創建了20個線程 for (int i = 1; i <= 20; i++) { asyncTaskService.executeAsyncTask(i); } context.close(); } // 測試有返回結果 private static void testReturn() throws InterruptedException, ExecutionException { AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(AsyncTaskConfig.class); AsyncTaskService asyncTaskService = context.getBean(AsyncTaskService.class); List<Future<String>> lstFuture = new ArrayList<Future<String>>();// 存放所有的線程,用于獲取結果 // 創建100個線程 for (int i = 1; i <= 100; i++) { while (true) { try { // 線程池超過最大線程數時,會拋出TaskRejectedException,則等待1s,直到不拋出異常為止 Future<String> future = asyncTaskService.asyncInvokeReturnFuture(i); lstFuture.add(future); break; } catch (TaskRejectedException e) { System.out.println("線程池滿,等待1S。"); Thread.sleep(1000); } } } // 獲取值。get是阻塞式,等待當前線程完成才返回值 for (Future<String> future : lstFuture) { System.out.println(future.get()); } context.close(); } }
maven配置
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>TestAysc</groupId> <artifactId>TestAysc</artifactId> <version>0.0.1-SNAPSHOT</version> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot</artifactId> <version>1.5.6.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>4.3.10.RELEASE</version> </dependency> </dependencies> </project>
結果展示:
1、無返回結果
2、有返回結果
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