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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