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首页 > 应用开发 > Java > java使用 CompletableFuture 实现异步任务聚合

java使用 CompletableFuture 实现异步任务聚合

原创 Java 作者：mingtian66 时间：2025-05-28 16:02:46 0 删除 编辑

以下是使用Java CompletableFuture实现异步任务聚合的示例，包含并行执行、结果合并和异常处理：


import java.util.Arrays;

import java.util.List;

import java.util.concurrent.CompletableFuture;

import java.util.concurrent.ExecutionException;

import java.util.stream.Collectors;


public class AsyncTaskAggregator {

    

    // 模拟异步任务

    private static CompletableFuture<String> fetchData(String source) {

        return CompletableFuture.supplyAsync(() -> {

            try {

                Thread.sleep((long)(Math.random() * 1000));

                return "Data from " + source;

            } catch (InterruptedException e) {

                throw new RuntimeException(e);

            }

        });

    }

    

    public static void main(String[] args) {

        List<String> sources = Arrays.asList("DB", "API", "Cache");

        

        // 1. 并行执行多个异步任务

        List<CompletableFuture<String>> futures = sources.stream()

            .map(AsyncTaskAggregator::fetchData)

            .collect(Collectors.toList());

        

        // 2. 聚合所有任务结果

        CompletableFuture<Void> allDone = CompletableFuture.allOf(

            futures.toArray(new CompletableFuture[0])

        );

        

        // 3. 处理最终结果

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        CompletableFuture<List<String>> results = allDone.thenApply(v ->

            futures.stream()

                .map(CompletableFuture::join)

                .collect(Collectors.toList())

        );

        

        try {

            // 4. 获取聚合结果（带超时控制）

            List<String> combined = results.get();

            System.out.println("聚合结果: " + combined);

            

            // 5. 异常处理示例

            CompletableFuture.supplyAsync(() -> {

                if (Math.random() > 0.5) {

                    throw new RuntimeException("模拟异常");

                }

                return "Fallback Data";

            }).exceptionally(ex -> {

                System.out.println("捕获异常: " + ex.getMessage());

                return "默认值";

            }).thenAccept(System.out::println);

            

        } catch (InterruptedException | ExecutionException e) {

            e.printStackTrace();

        }

    }

}

该代码演示了使用CompletableFuture实现多任务并行执行、结果聚合和异常处理。关键点包括：1.使用allOf等待所有任务完成 2.thenApply转换结果 3.exceptionally处理异常 4.支持链式调用和异步回调。

来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/70040412/viewspace-3086031/ ，如需转载，请注明出处，否则将追究法律责任。

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