java线程池合理设置最大线程数和核心线程数方式

@Configuration
@EnableAsync(proxyTargetClass = true)//利用@EnableAsync注解开启异步任务支持
@ComponentScan({"com.ctfojt.auditbcarslogo.service"}) //必须加此注解扫描包
public class ThreadPoolConfig implements AsyncConfigurer {
    @Override
    public Executor getAsyncExecutor() {
        ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
        taskExecutor.setCorePoolSize(10);//核心线程大小
        taskExecutor.setMaxPoolSize(20);//最大线程大小
        taskExecutor.setQueueCapacity(500);//队列最大容量
        //当提交的任务个数大于QueueCapacity，就需要设置该参数，但spring提供的都不太满足业务场景，可以自定义一个，也可以注意不要超过QueueCapacity即可
        taskExecutor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        taskExecutor.setWaitForTasksToCompleteOnShutdown(true);
        taskExecutor.setAwaitTerminationSeconds(10);
        taskExecutor.setThreadNamePrefix("BCarLogo-Thread-");
        taskExecutor.initialize();
        return taskExecutor;
    }
}

//获取当前机器的核数
public static final int cpuNum = Runtime.getRuntime().availableProcessors();
@Override
    public Executor getAsyncExecutor() {
        ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
        taskExecutor.setCorePoolSize(cpuNum);//核心线程大小
        taskExecutor.setMaxPoolSize(cpuNum * 2);//最大线程大小
        taskExecutor.setQueueCapacity(500);//队列最大容量
        //当提交的任务个数大于QueueCapacity，就需要设置该参数，但spring提供的都不太满足业务场景，可以自定义一个，也可以注意不要超过QueueCapacity即可
        taskExecutor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        taskExecutor.setWaitForTasksToCompleteOnShutdown(true);
        taskExecutor.setAwaitTerminationSeconds(60);
        taskExecutor.setThreadNamePrefix("BCarLogo-Thread-");
        taskExecutor.initialize();
        return taskExecutor;
    }