spring boot-执行Async任务时，使用自定义的线程池

在前面的博客中，http://blog.csdn.net/liuchuanhong1/article/details/54605697 我们使用了spring boot的异步操作，当时，我们使用的是默认的线程池，但是，如果我们想根据项目来定制自己的线程池了，下面就来说说，如何定制线程池！

一、增加配置属性类

package com.chhliu.springboot.async.configuration;import org.springframework.boot.context.properties.ConfigurationProperties;@ConfigurationProperties(prefix = "spring.task.pool") // 该注解的locations已经被启用，现在只要是在环境中，都会优先加载public class TaskThreadPoolConfig {private int corePoolSize;private int maxPoolSize;private int keepAliveSeconds;private int queueCapacity;…………省略getter,setter方法…………}

二、创建线程池

package com.chhliu.springboot.async.pool;import java.util.concurrent.Executor;import java.util.concurrent.ThreadPoolExecutor;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.scheduling.annotation.EnableAsync;import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;import com.chhliu.springboot.async.configuration.TaskThreadPoolConfig;@Configuration@EnableAsyncpublic class TaskExecutePool {@Autowiredprivate TaskThreadPoolConfig config;@Beanpublic Executor myTaskAsyncPool() {ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();executor.setCorePoolSize(config.getCorePoolSize());executor.setMaxPoolSize(config.getMaxPoolSize());executor.setQueueCapacity(config.getQueueCapacity());executor.setKeepAliveSeconds(config.getKeepAliveSeconds());executor.setThreadNamePrefix("MyExecutor-");// rejection-policy：当pool已经达到max size的时候，如何处理新任务// CALLER_RUNS：不在新线程中执行任务，而是由调用者所在的线程来执行executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());executor.initialize();return executor;}}

三、在主类中开启配置支持

package com.chhliu.springboot.async;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.boot.context.properties.EnableConfigurationProperties;import org.springframework.scheduling.annotation.EnableAsync;import com.chhliu.springboot.async.configuration.TaskThreadPoolConfig;@SpringBootApplication@EnableAsync@EnableConfigurationProperties({TaskThreadPoolConfig.class} ) // 开启配置属性支持public class SpringbootAsyncApplication {public static void main(String[] args) {SpringApplication.run(SpringbootAsyncApplication.class, args);}}

四、测试类

package com.chhliu.springboot.async.pool;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.scheduling.annotation.Async;import org.springframework.stereotype.Component;@Component  public class AsyncTask {    protected final Logger logger = LoggerFactory.getLogger(this.getClass());            @Async("myTaskAsyncPool")  //myTaskAsynPool即配置线程池的方法名，此处如果不写自定义线程池的方法名，会使用默认的线程池    public void doTask1(int i) throws InterruptedException{          logger.info("Task"+i+" started.");      }  }  

五、测试

package com.chhliu.springboot.async;import java.util.concurrent.ExecutionException;import org.junit.Test;import org.junit.runner.RunWith;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.boot.test.context.SpringBootTest;import org.springframework.test.context.junit4.SpringRunner;import com.chhliu.springboot.async.pool.AsyncTask;@RunWith(SpringRunner.class)@SpringBootTestpublic class SpringbootAsyncApplicationTests {protected final Logger logger = LoggerFactory.getLogger(this.getClass());@Autowiredprivate AsyncTask asyncTask;@Testpublic void AsyncTaskTest() throws InterruptedException, ExecutionException {for (int i = 0; i < 100; i++) {asyncTask.doTask1(i);}logger.info("All tasks finished.");}}

测试结果如下：

2017-03-20 20:15:15.208  INFO 4068 --- [  MyExecutor-10] c.c.springboot.async.pool.AsyncTask      : Task60 started.2017-03-20 20:15:15.208  INFO 4068 --- [  MyExecutor-25] c.c.springboot.async.pool.AsyncTask      : Task61 started.2017-03-20 20:15:15.208  INFO 4068 --- [   MyExecutor-6] c.c.springboot.async.pool.AsyncTask      : Task62 started.2017-03-20 20:15:15.208  INFO 4068 --- [  MyExecutor-23] c.c.springboot.async.pool.AsyncTask      : Task63 started.2017-03-20 20:15:15.208  INFO 4068 --- [  MyExecutor-20] c.c.springboot.async.pool.AsyncTask      : Task64 started.2017-03-20 20:15:15.208  INFO 4068 --- [  MyExecutor-19] c.c.springboot.async.pool.AsyncTask      : Task65 started.2017-03-20 20:15:15.208  INFO 4068 --- [  MyExecutor-16] c.c.springboot.async.pool.AsyncTask      : Task66 started.2017-03-20 20:15:15.208  INFO 4068 --- [  MyExecutor-15] c.c.springboot.async.pool.AsyncTask      : Task67 started.2017-03-20 20:15:15.208  INFO 4068 --- [  MyExecutor-12] c.c.springboot.async.pool.AsyncTask      : Task68 started.2017-03-20 20:15:15.209  INFO 4068 --- [   MyExecutor-1] c.c.springboot.async.pool.AsyncTask      : Task69 started.2017-03-20 20:15:15.209  INFO 4068 --- [  MyExecutor-11] c.c.springboot.async.pool.AsyncTask      : Task81 started.2017-03-20 20:15:15.209  INFO 4068 --- [   MyExecutor-8] c.c.springboot.async.pool.AsyncTask      : Task82 started.2017-03-20 20:15:15.209  INFO 4068 --- [   MyExecutor-7] c.c.springboot.async.pool.AsyncTask      : Task83 started.2017-03-20 20:15:15.209  INFO 4068 --- [   MyExecutor-4] c.c.springboot.async.pool.AsyncTask      : Task84 started.2017-03-20 20:15:15.209  INFO 4068 --- [  MyExecutor-29] c.c.springboot.async.pool.AsyncTask      : Task85 started.2017-03-20 20:15:15.209  INFO 4068 --- [  MyExecutor-21] c.c.springboot.async.pool.AsyncTask      : Task86 started.2017-03-20 20:15:15.209  INFO 4068 --- [  MyExecutor-17] c.c.springboot.async.pool.AsyncTask      : Task88 started.

测试结果ok！

六、配置默认的线程池

如果我们想使用默认的线程池，但是只是想修改默认线程池的配置，那怎么做了，此时我们需要实现AsyncConfigurer类，示例代码如下：

import java.lang.reflect.Method;import java.util.concurrent.Executor;import java.util.concurrent.ThreadPoolExecutor;import org.springframework.aop.interceptor.AsyncUncaughtExceptionHandler;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.annotation.Configuration;import org.springframework.scheduling.annotation.AsyncConfigurer;import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;import com.chhliu.cq.emailservice.threadconfiguration.TaskThreadPoolConfig;import lombok.extern.slf4j.Slf4j;  /** * 注意：该线程池被所有的异步任务共享，而不属于某一个异步任务 * 描述：配置异步任务的线程池 * @author chhliu * 创建时间：2017年5月22日 上午10:20:56 * @version 1.2.0 */@Slf4j@Configurationpublic class AsyncTaskExecutePool implements AsyncConfigurer{        @Autowired      private TaskThreadPoolConfig config;  // 配置属性类，见上面的代码  @Overridepublic Executor getAsyncExecutor() {ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();        executor.setCorePoolSize(config.getCorePoolSize());          executor.setMaxPoolSize(config.getMaxPoolSize());          executor.setQueueCapacity(config.getQueueCapacity());          executor.setKeepAliveSeconds(config.getKeepAliveSeconds());          executor.setThreadNamePrefix("taskExecutor-");            // rejection-policy：当pool已经达到max size的时候，如何处理新任务          // CALLER_RUNS：不在新线程中执行任务，而是由调用者所在的线程来执行          executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());        executor.initialize();          return executor;  }@Overridepublic AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {// 异步任务中异常处理return new AsyncUncaughtExceptionHandler() {@Overridepublic void handleUncaughtException(Throwable arg0, Method arg1, Object... arg2) {log.error("=========================="+arg0.getMessage()+"=======================", arg0);log.error("exception method:"+arg1.getName());}};}  }

使用的时候，只需在方法上加上@Async即可。