使用线程池处理多返回值任务-优快云博客

本文链接：https://blog.youkuaiyun.com/lie_123/article/details/95481443

本文探讨了如何在多线程环境中处理多个返回值的问题，重点关注线程池的运用，阐述了如何有效地管理和协调并发任务以获取并处理各个任务的返回结果。

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多返回值多线程

//可修改为自定义线程池
ExecutorService threadPool = Executors. newFixedThreadPool(poolsize);
for (int i = 0; i < contracts.length; i++) {
         // 创建多个有返回值的任务
        Callable c = new Build(contracts[i]);
        // 执行任务并获取Future对象
        Future<model> f = threadPool.submit(c);
        futures.add(f);
    }
    // 关闭线程池
    threadPool.shutdown();
    // 获取所有并发任务的运行结果
    for (Future<model> fu : futures) {
        // 从Future对象上获取任务的返回值，并输出到控制台
        try {
            evidenceList.add(fu.get());
        } catch (InterruptedException e) {
            msgResult +=e.getCause().getMessage();
        } catch (ExecutionException e) {
            msgResult +=e.getCause().getMessage();
        }
    }
}


```java

    @Autowired
    private TaskExecutor taskExecutor;
 
    public void auditImages(List<String> urls) {
        try {
            //初始化队列
            final BlockingQueue<Future<result>> queue = new LinkedBlockingDeque<>(urls.size());
            //实例化自定义线程池
            final CompletionService<result> completionService = new ExecutorCompletionService<>(taskExecutor, queue);
            for (String url:urls){
                completionService.submit(new Callable<result>() {
                    @Override
                    public result call() throws Exception {
                    	//处理数据
                        return checkImg(url);
                    }
                });
            }
            //获取结果
            for (String url:urls) {
                try {
                    Future<result> take = completionService.take();
                    result result = take.get();
                    
                } catch (InterruptedException e) {
                    Thread.currentThread().interrupt();
                    log.error("completionService.take InterruptedException", e);
                } catch (ExecutionException e) {
                    log.error("take.get() ExecutionException", e);
                }
            }
        } catch (BusinessException e) {
            log.error("图片审核异常", e);
            throw e;
        } catch (Exception e) {
            log.error("图片审核异常", e);
            throw e;
        }
    }