如何在java中停止一个线程并让同一个线程做另一件事? [英] How to stop a thread in java and let the same thread to do another thing?

问题描述

我启动一个线程从互联网下载内容，有一次，该线程正在下载一个文件，然后我希望它停止并开始下载另一个文件，我该怎么办?我应该指望java中的并发机制吗?

I start one thread to download contents from the internet, at one time, the thread is downloading one file, and then i want it stop and begin to download another file, what should i do? should i count on the concurrency mechanism in java?

推荐答案

您可以使用 单线程执行器，然后当你杀死它(我希望优雅地)并启动一个新的时，它将确保它使用同一个线程.

You can start your thread using a single-thread executor, then when you kill it (gracefully I hope) and start a new one it will ensure that it's using the same thread.

// Suppose you have a DownloadFile class that implements Runnable
DownloadFile task1 = new DownloadFile();

...

ExecutorService exec = Executors.newSingleThreadExecutor();

Future<Boolean> future = exec.submit( task1, Boolean.TRUE );

...

// Cancel the task
future.cancel();

// Give the executor another task
DownloadFile task2 = new DownloadFile();
...
exec.submit( task2, Boolean.TRUE );

其他有用的文档:

• 未来
• ExecutorService

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