springboot快速配置线程池

线程池应用场景：

服务中嵌入邮件通知/异常通过消息系统报警等

尽量减少影响原服务效率的不重要服务，需要采用线程池异步方式调用

步骤：

1、启动类配置线程池启用注解
@EnableAsyn

2、可选：配置配置类（不配的话就是默认的）

package com.a;

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 int corePoolSize = 10;

    private int maxPoolSize = 200;

    private int queueCapacity = 100;

    public static final String EXECUTORE_COMMON = "commonExecutor";

    public static final String EXECUTOR_MAIL = "mailExecutor";

    @Bean
    public Executor mailExecutor() {
    
     return configExecutor(EXECUTOR_MAIL); }

    @Bean
    public Executor commonExecutor() {
    
    
        return configExecutor("commonExecutor");
    }

    private Executor configExecutor(String threadNamePrefix) {
    
    
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(corePoolSize);
        executor.setMaxPoolSize(maxPoolSize);
        executor.setQueueCapacity(queueCapacity);
        executor.setThreadNamePrefix(threadNamePrefix);
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        executor.initialize();
        return executor;
    }
}

3、在需要开启异步的方法上使用**@Async**注解，方法不能为privated
如果使用配置类的配置，则加上对应配置的bean名称，
比如@Async(“mailExecutor”)

4、注意日志编写
比如线程池的开启与结束，邮件发送内容，邮件发送结果等加上日志