面试题：Java Spring线程池的动态调整

关键配置

引入依赖：确保项目中引入了Spring相关依赖，如spring-context等基础依赖。
线程池配置类：通过@Configuration注解定义一个配置类，在其中定义ThreadPoolTaskExecutor的Bean。例如：

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import java.util.concurrent.Executor;

@Configuration
public class ThreadPoolConfig {

    @Bean
    public Executor taskExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(5);
        executor.setMaxPoolSize(10);
        executor.setQueueCapacity(25);
        executor.initialize();
        return executor;
    }
}

代码实现思路

获取线程池实例：在需要动态调整线程池参数的地方，通过依赖注入获取ThreadPoolTaskExecutor实例。例如在一个Service中：

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.stereotype.Service;

@Service
public class MyService {

    @Autowired
    private ThreadPoolTaskExecutor taskExecutor;

    public void adjustThreadPool(int corePoolSize, int maxPoolSize) {
        taskExecutor.setCorePoolSize(corePoolSize);
        taskExecutor.setMaxPoolSize(maxPoolSize);
    }
}

动态调整：在合适的业务逻辑处调用adjustThreadPool方法，传入需要调整的核心线程数和最大线程数的值，即可实现动态调整。例如在Controller中：

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class MyController {

    @Autowired
    private MyService myService;

    @GetMapping("/adjustThreadPool")
    public String adjustThreadPool(@RequestParam int corePoolSize, @RequestParam int maxPoolSize) {
        myService.adjustThreadPool(corePoolSize, maxPoolSize);
        return "ThreadPool adjusted successfully";
    }
}

另外，还可以通过@Value注解从配置文件（如application.properties或application.yml）中读取初始的核心线程数和最大线程数，并且在运行时通过修改配置文件并触发Spring的配置刷新机制（如使用Spring Cloud Config或@RefreshScope等）来动态调整线程池参数。

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面试题：Java Spring线程池的动态调整

知识考点

面试题答案

关键配置

代码实现思路