SpringBoot多线程

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已于 2022-12-24 16:37:52 修改

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分类专栏： java 文章标签： spring boot java 后端

于 2022-12-24 16:37:44 首次发布

本文链接：https://blog.youkuaiyun.com/weixin_45251038/article/details/128429388

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该博客介绍了如何在Spring Boot中配置和使用异步任务。通过`ExecutorConfig`类配置了一个`ThreadPoolTaskExecutor`，设置了核心线程数、最大线程数、队列容量等参数，并实现了异常处理。`AsyncService`接口定义了异步方法`ClassifiedimportItem`，在`AsyncServiceImpl`中实现并调用了业务服务。在Controller中，根据数据量动态拆分任务并异步调用处理方法，确保高效执行大量数据处理。

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ExecutorConfig配置类

@Configuration
@EnableAsync
public class ExecutorConfig implements AsyncConfigurer {

    @Bean
    @Override
    public Executor getAsyncExecutor(){
        System.out.println("start asyncServiceExecutor");
        ThreadPoolTaskExecutor executor=new ThreadPoolTaskExecutor();
        // 设置核心线程数
        executor.setCorePoolSize(5);
        // 设置最大线程数
        executor.setMaxPoolSize(20);
        // 设置队列容量
        executor.setQueueCapacity(20);
        // 设置线程活跃时间（秒）
        executor.setKeepAliveSeconds(60);
        // 设置默认线程名称
        executor.setThreadNamePrefix("hello Thread-");
        // 设置拒绝策略
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        // 等待所有任务结束后再关闭线程池
        executor.setWaitForTasksToCompleteOnShutdown(true);
        return executor;
    }

    @Override
    public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
        return AsyncConfigurer.super.getAsyncUncaughtExceptionHandler();
    }
}

AsyncService接口

/**
 * 异步服务接口
 *
 */
public interface AsyncService  {
    /*自定义接口*/
    void ClassifiedimportItem(List<ClassifiedDrawActivityUserjoin> classifiedDrawActivityUserjoinList, String fatherUniqueNumber);
}

AsyncServiceImpl

@Service
public class AsyncServiceImpl implements AsyncService {
    @Autowired
    private ClassifiedDrawActivityUserJoinService ClassifiedDrawActivityUserJoinService;

    @Async
    @Override
    public void ClassifiedimportItem(List<ClassifiedDrawActivityUserjoin> List, String fatherUniqueNumber) {
        System.out.println(
                Thread.currentThread().getName() + "\t" + Thread.currentThread().getId() +  "\t" + "执行了线程任务"
        );
        
        //Add your code
        ClassifiedDrawActivityUserJoinService.importItem(List,fatherUniqueNumber);
    }

 
}

Controller

  @Autowired
    AsyncService asyncService;

    //每个线程处理的数据量
    private static final int deviceCount = 5000;
    //处理数据
    public static List<List<ClassifiedDrawActivityUserjoin>> createList(List<ClassifiedDrawActivityUserjoin> target, int size) {
        //新建返回 list
        List<List<ClassifiedDrawActivityUserjoin>> listArr = new ArrayList<List<ClassifiedDrawActivityUserjoin>>();
        //获取被拆分的数组个数
        int arrSize = target.size() % size == 0 ? target.size() / size : target.size() / size + 1;
        System.out.println(arrSize+"个数组/线程");
        //依次处理arrSize个数组
        for (int i = 0; i < arrSize; i++) {
            //新建sublist
            List<ClassifiedDrawActivityUserjoin> sub = new ArrayList<ClassifiedDrawActivityUserjoin>();
            //把将size个数据放入到sublist中
            for (int j = i * size; j <= size * (i + 1) - 1; j++) {
                if (j <= target.size() - 1) {
                    sub.add(target.get(j));
                }
            }
            //添加到listArr
            listArr.add(sub);
        }
        //返回listArr-包含arrSize个list
        return listArr;
    }

  
    @Transactional(rollbackFor = Exception.class)
    @PostMapping("/importItem")
    @ResponseBody
    public ApiRestResponse importUser(HttpSession session, @RequestParam("data") String requestData,@RequestParam("fatherUniqueNumber") String fatherUniqueNumber) {

        try {
            //2.1数据判断
            if (classifiedDrawActivityUserjoinList.size() <= deviceCount) {
                asyncService.ClassifiedimportItem(classifiedDrawActivityUserjoinList,fatherUniqueNumber);
            } else {
                List<List<ClassifiedDrawActivityUserjoin>> listNew = createList(classifiedDrawActivityUserjoinList, deviceCount);
                for (List<ClassifiedDrawActivityUserjoin> i : listNew) {
                    /* 异步处理 */
                    asyncService.ClassifiedimportItem(i,fatherUniqueNumber);
                    //System.out.println("调用"+i+"个线程");
                }
            }
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
            System.out.println(e.toString() + " 错误所在行数：" + e.getStackTrace()[0].getLineNumber());
        }

    }