Servlet似乎同时处理多个并发浏览器请求 [英] Servlet seems to handle multiple concurrent browser requests synchronously

问题描述

据我所知，Java Servlet正在同时处理多个请求，并且通过StackOverflow和Google进行了搜索，并确认了我的想法。但我现在很困惑，我写了一个简单的servlets，似乎显示阻塞行为。

As far as I know Java Servlets are handling multiple requests concurrently and I've searched through StackOverflow as well as Google, and confirmed what I thought. However I am quite confused right now, I wrote a simple servlets that seem to show blocking behaviour.

所以我有一个简单的Servlet：

so I have a simple Servlet:

public class MyServlet extends HttpServlet 
{
    private static final long serialVersionUID = 2628320200587071622L;

    private static final Logger logger = Logger.getLogger(MyServlet.class);

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException 
    {
        logger.info("[doGet] Test before");

        try {
            Thread.sleep(60000);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        logger.info("[doGet] Test after");

    resp.setContentType("text/plain");
    resp.getWriter().write("OK");

    }
}

然后我有2个浏览器窗口，我在〜同时打开我的Servlet。
结果是第一个请求阻塞第二个。日志还显示：

Then I have 2 browser windows, I opened at the ~same time that hit my Servlet. And the result is the first request blocking the 2nd one. The log also shows:

10:49:05,088 [http-8383-Processor14]  INFO MyServlet - [doGet] Test before
10:50:05,096 [http-8383-Processor14]  INFO MyServlet - [doGet] Test after
10:50:05,106 [http-8383-Processor22]  INFO MyServlet - [doGet] Test before
10:51:05,112 [http-8383-Processor22]  INFO MyServlet - [doGet] Test after

我觉得我缺少的东西... Servlets应该能够处理并发请求，但它似乎没有做它。我也对上面的服务方法而不是doGet做了相同的，它做同样的事情。

I feel like I am missing something ... Servlets supposed to be able to handle concurrent request, but it doesnt seem to be doing it. I also did the same as above on the service method instead of doGet and it does the same thing.

任何指针？

感谢

推荐答案

您的浏览器显然在不同的窗口中使用相同的HTTP连接。 servlet容器对每个HTTP连接使用单个线程，而不是每个HTTP请求。你应该运行两个物理上不同的webbrowser来测试这个正确。例如。一个Firefox和一个Chrome。

Your browser is apparently using the same HTTP connection in different windows. The servlet container uses a single thread per HTTP connection, not per HTTP request. You should run two physically different webbrowsers to test this properly. E.g. one Firefox and one Chrome.

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