Spring通过任务执行器(TaskExecutor)来实现多线程和并发编程的
可使用ThreadPoolTaskExecutor来实现基于线程池的TaskExecutor
在实际开发中由于多是异步，所以使用@EnableAsync来支持异步任务，且要在Bean的方法中使用@Async来声明其是一个异步任务
????? 以下实例：
??? 配置类
class="配置类TaskExecutorConfig" name="code">package com.zgw.taskexecutor;
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("com.zgw.taskexecutor")
@EnableAsync //开启对异步任务的支持
public class TaskExecutorConfig implements AsyncConfigurer {
/**
* 通过实现AsyncConfigurer接口，重写getAsyncExecutor()方法，
* 返回一个ThreadPoolTaskExecutor对象，这样实现一个基于线程池
* TaskExecutor
*/
@Override
public Executor getAsyncExecutor() {
ThreadPoolTaskExecutor taskExecutor=new ThreadPoolTaskExecutor();
taskExecutor.setCorePoolSize(10);
taskExecutor.setMaxPoolSize(20);
taskExecutor.setQueueCapacity(25);
taskExecutor.initialize();
return taskExecutor;
}
@Override
public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
return null;
}
}
任务执行类
?????
Service" name="code">package com.zgw.taskexecutor;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Service;
@Service
public class AsyncTaskService {
@Async //声明是一个异步方法
public void executeAsyncTaskOne(int i){
System.out.println("执行异步任务: "+i);
}
@Async
public void executeAsyncTaskTwo(int i){
System.out.println("执行异步任务加1操作:"+(i+1));
}
}
?
?
3.运行
package com.zgw.taskexecutor;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
public class TestExecutor {
public static void main(String[] args) {
//使用AnnotationConfigApplicationContext作为spring容器，
//接收输入一个配置类作为参数
AnnotationConfigApplicationContext context =
new AnnotationConfigApplicationContext(TaskExecutorConfig.class);
//获得声明配置的AsyncTaskService的Bean
AsyncTaskService asyncTaskService = context.getBean(AsyncTaskService.class);
for(int i =0 ;i<20;i++){
asyncTaskService.executeAsyncTaskOne(i);
asyncTaskService.executeAsyncTaskTwo(i);;
}
context.close();
}
}
?
3.运行
?
package com.zgw.taskexecutor;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
public class TestExecutor {
public static void main(String[] args) {
//使用AnnotationConfigApplicationContext作为spring容器，
//接收输入一个配置类作为参数
AnnotationConfigApplicationContext context =
new AnnotationConfigApplicationContext(TaskExecutorConfig.class);
//获得声明配置的AsyncTaskService的Bean
AsyncTaskService asyncTaskService = context.getBean(AsyncTaskService.class);
for(int i =0 ;i<20;i++){
asyncTaskService.executeAsyncTaskOne(i);
asyncTaskService.executeAsyncTaskTwo(i);;
}
context.close();
}
}
?
? 运行结果如下：
?
?
?结果是并发执行而不是顺序执行的。
?
????
spring_thread.rar (10.1 KB)
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