学习笔记

• 一、ThreadPoolTaskExecutor与ThreadPoolExecutor的区别
• 二、编写配置文件ThreadPoolConfig
• 二、编写Controller
• 三、编写Service
• • 3.1、注解
  • 3.1、注入

一、ThreadPoolTaskExecutor与ThreadPoolExecutor的区别

ThreadPoolExecutor 是JDK自1.5添加的线程池。
ThreadPoolTaskExecutor是Spring的线程池【本文使用的】。
Spring线程池ThreadPoolTaskExecutor其实是对JDK线程池ThreadPoolExecutor的一个封装。

二、编写配置文件ThreadPoolConfig

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;import java.util.concurrent.*;@Configuration
public class ThreadPoolConfig {/** 核心线程数（默认线程数） */private static final int CORE_POOL_SIZE = 20;/** 最大线程数 */private static final int MAX_POOL_SIZE = 50;/** 允许线程空闲时间（单位：默认为秒） */private static final int KEEP_ALIVE_TIME = 10;/** 缓冲队列大小 */private static final int QUEUE_CAPACITY = 200;/** 线程池名前缀 */private static final String THREAD_NAME_PREFIX = "ThreadPool-";@Bean("taskExecutor") // bean的名称，默认为首字母小写的方法名public ThreadPoolTaskExecutor taskExecutor(){ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();executor.setCorePoolSize(CORE_POOL_SIZE);executor.setMaxPoolSize(MAX_POOL_SIZE);executor.setQueueCapacity(QUEUE_CAPACITY);executor.setKeepAliveSeconds(KEEP_ALIVE_TIME);executor.setThreadNamePrefix(THREAD_NAME_PREFIX);// 线程池对拒绝任务的处理策略// CallerRunsPolicy：由调用线程（提交任务的线程）处理该任务executor.setRejectedExecutionHandler(new ThreadPoolExecutor.AbortPolicy());// 初始化executor.initialize();return executor;}
}

二、编写Controller

import com.ynx.exarejuc.service.HelloService;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import javax.annotation.Resource;@RestController
public class HelloController {@Resourceprivate HelloService helloService;@RequestMapping("/hello100")public void sayHello100() throws InterruptedException {for (int i = 1; i <100 ; i++) {helloService.hello();}}
}

三、编写Service

3.1、注解

在使用多线程方法上标注@Async时表明调用的线程池 同时在类上和application类上加上@EnableAsync

通过这个@Async注解的方式去异步调用的

import org.springframework.scheduling.annotation.Async;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
import java.util.concurrent.Executor;@EnableAsync
@Service
public class HelloService {//在使用多线程方法上标注@Async时表明调用的线程池 同时在类上和application类上加上@EnableAsync，如下@Async("taskExecutor")public void  hello() throws InterruptedException {System.out.println(Thread.currentThread().getName() + "处理任务ing...");}
}

访问http://localhost:8080/hello100

3.1、注入

import org.springframework.scheduling.annotation.Async;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
import java.util.concurrent.Executor;@Service
public class HelloService {@Resource(name = "taskExecutor")private Executor taskExecutor;public void hello(){taskExecutor.execute(()->{System.out.println(Thread.currentThread().getName() + "处理任务ing...");});}
}

访问http://localhost:8080/hello100