SpringBoot-ThreadPoolExecutor实例demo

最新推荐文章于 2025-04-24 13:48:08 发布

陈鋆

最新推荐文章于 2025-04-24 13:48:08 发布

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本章节为基于SpringBoot 通过注解方式实现ThreadPoolExecutor实例，步骤过程如下：

1、定义ExecutorConfig类，用于配置、初始化ThreadPoolTaskExecutor类

package com.example.threadpooldemo.config;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
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 java.util.concurrent.Executor;
import java.util.concurrent.ThreadPoolExecutor;

@Configuration
@EnableAsync
public class ExecutorConfig {
    private static final Logger logger = LoggerFactory.getLogger(ExecutorConfig.class);

    @Value("${async.executor.thread.core_pool_size}")
    private int corePoolSize;
    @Value("${async.executor.thread.max_pool_size}")
    private int maxPoolSize;
    @Value("${async.executor.thread.queue_capacity}")
    private int queueCapacity;
    @Value("${async.executor.thread.name.prefix}")
    private String namePrefix;

    @Bean(name = "asyncServiceExecutor")
    public Executor asyncServiceExecutor() {
        logger.info("start asyncServiceExecutor");
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
//        ThreadPoolTaskExecutor executor = new VisiableThreadPoolTaskExecutor();
        //配置核心线程数
        executor.setCorePoolSize(corePoolSize);
        //配置最大线程数
        executor.setMaxPoolSize(maxPoolSize);
        //配置队列大小
        executor.setQueueCapacity(queueCapacity);
        //配置线程池中的线程的名称前缀
        executor.setThreadNamePrefix(namePrefix);
        // 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，而是有调用者所在的线程来执行
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        //执行初始化
        executor.initialize();
        return executor;
    }
}

2、定义ThreadPoolTaskExecutor类属性配置源文件-application.properties

# 异步线程配置
# 配置核心线程数
async.executor.thread.core_pool_size = 5
# 配置最大线程数
async.executor.thread.max_pool_size = 5
# 配置队列大小
async.executor.thread.queue_capacity = 99999
# 配置线程池中的线程的名称前缀
async.executor.thread.name.prefix = async-service-

3、定义异步服务接口和实现类

package com.example.threadpooldemo.config;

public interface AsyncService {
    /**
     * 执行异步任务
     * 可以根据需求，自己加参数拟定，我这里就做个测试演示
     */
    void executeAsync();
}


package com.example.threadpooldemo.config;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Service;

@Service
public class AsyncServiceImpl implements  AsyncService {
    private static final Logger logger = LoggerFactory.getLogger(AsyncServiceImpl.class);

    @Override
    @Async("asyncServiceExecutor")
    public void executeAsync() {
        logger.info("start executeAsync");
        System.out.println("异步线程要做的事情");
        System.out.println("可以在这里执行批量插入等耗时的事情");
        logger.info("end executeAsync");
    }
}

实现类AsyncServiceImpl 中public void executeAsync() 通过@Async("asyncServiceExecutor")注解 关联ExecutorConfig类 @Bean(name = "asyncServiceExecutor") ，即executeAsync方法进入的线程池是asyncServiceExecutor方法来创建

4、Controller：通过注解@Autowired注入并调用Service

package com.example.threadpooldemo.config;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

/*Spring Restful风格*/
@RestController
public class AyncControlller {

    @Autowired
    private AsyncService asyncService;

    /*外部资源映射-http://localhost:8080/async*/
    @GetMapping("/async")
    public void async(){
        asyncService.executeAsync();
    }
}

5、测试-postmain [http://localhost:8080/async]

2021-05-17 17:13:59.331  INFO 17516 --- [async-service-1] c.e.t.config.AsyncServiceImpl            : start executeAsync
异步线程要做的事情
可以在这里执行批量插入等耗时的事情
2021-05-17 17:13:59.332  INFO 17516 --- [async-service-1] c.e.t.config.AsyncServiceImpl            : end executeAsync
2021-05-17 17:14:00.047  INFO 17516 --- [async-service-2] c.e.t.config.AsyncServiceImpl            : start executeAsync
异步线程要做的事情
可以在这里执行批量插入等耗时的事情
2021-05-17 17:14:00.047  INFO 17516 --- [async-service-2] c.e.t.config.AsyncServiceImpl            : end executeAsync
2021-05-17 17:14:00.754  INFO 17516 --- [async-service-3] c.e.t.config.AsyncServiceImpl            : start executeAsync
异步线程要做的事情
可以在这里执行批量插入等耗时的事情
2021-05-17 17:14:00.754  INFO 17516 --- [async-service-3] c.e.t.config.AsyncServiceImpl            : end executeAsync
2021-05-17 17:14:01.429  INFO 17516 --- [async-service-4] c.e.t.config.AsyncServiceImpl            : start executeAsync
异步线程要做的事情
可以在这里执行批量插入等耗时的事情
2021-05-17 17:14:01.429  INFO 17516 --- [async-service-4] c.e.t.config.AsyncServiceImpl            : end executeAsync
2021-05-17 17:14:02.052  INFO 17516 --- [async-service-5] c.e.t.config.AsyncServiceImpl            : start executeAsync
异步线程要做的事情
可以在这里执行批量插入等耗时的事情
2021-05-17 17:14:02.052  INFO 17516 --- [async-service-5] c.e.t.config.AsyncServiceImpl            : end executeAsync
2021-05-17 17:14:02.687  INFO 17516 --- [async-service-1] c.e.t.config.AsyncServiceImpl            : start executeAsync
异步线程要做的事情
可以在这里执行批量插入等耗时的事情
2021-05-17 17:14:02.687  INFO 17516 --- [async-service-1] c.e.t.config.AsyncServiceImpl            : end executeAsync

默认线程数为5.

PS:pom.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.4.5</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>threadpooldemo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>threadpooldemo</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>