java - JSP如何防止HTTP请求超时？

Question

嗨，我应该如何防止 http 请求超时？

非常感谢

Answer 1

您想防止网络浏览器在长时间运行的 HTTP 请求中超时？

您需要在响应中写入一些内容，即使它只是进度的简单可视化。或者在后台线程而不是 HTTP 请求线程中执行长时间运行的任务。或者优化长时间运行的任务，使其不会运行得太长。

<小时/>

更新:根据评论，您可以在 ExecutorService 的帮助下创建后台线程。并将长时间运行的任务提交给它。

public class LongRunningTaskServlet extends HttpServlet {

    private ExecutorService executor;

    @Override
    public void init() {
        executor = Executors.newSingleThreadExecutor();
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) {
        // First gather necessary parameters for the background task (you shouldn't pass request/response to it!).
        String param1 = request.getParameter("param1");
        String param2 = request.getParameter("param2");

        // Then create the background task and submit it to the executor.
        executors.submit(new LongRunningTask(param1, param2));
        // It returns a Future, you can if necessary store it in session so that you can later check if it is finished and/or has returned a result.

        // Immediately display result.
        request.getRequestDispatcher("/WEB-INF/result.jsp").forward(request, response);
    }

    @Override
    public void destroy() {
        executor.shutdownNow(); // Important! Pevent thread leaking.
    }

}

LongRunningTask类必须实现 Callable<T> 或 Runnable 。小心线程，不要删除 destroy()在上面的例子中。

另请参阅:

• The Java Tutorials - Concurrency - Executors