多线程在Web应用程序中的作用 [英] role of multithreading in web application

问题描述

自2年以来，我一直在使用java(Servlets，JSPs)进行Web应用程序开发.在那两年中，我从不需要在任何项目中使用multithreading(明确地-我知道servlet容器使用线程为不同的请求提供相同的servlet).

I am using java(Servlets, JSPs) since 2 years for web application development. In those 2 years I never required to use multithreading(explicitly - as I know that servlet containers uses threading to serve same servlet to different requests) in any project.

但是，每当我参加Web开发人员职位(java)的面试时，就会有几个与java中的线程相关的问题.我知道Java线程的基础知识，因此回答问题不是问题.但是有时候我会因为不使用mutithreading而在开发Web应用程序时是否缺少某些东西感到困惑?

But whenever I attend an interview for Web Developer position(java), then there are several questions related to threads in java. I know the basics of java threading so answering the questions is not a problem. But sometimes I get confused whether I am missing something while developing web application by not using mutithreading?

所以我的问题是multithreading在Web应用程序中的作用是什么?可以在Web应用程序中使用multithreading的任何示例.

So my question is that what is the role of multithreading in Web Application? Any example where multithreading can be used in web application will be appreciated.

谢谢.

推荐答案

主要在对异步调用感兴趣的情况下，可以在Web Apps中使用多线程.

Multi-threading can be used in Web Apps mainly when you are interested in asynchronous calls.

例如，请考虑您有一个Web应用程序，该应用程序可以激活GSM网络上的用户状态(例如，激活4G计划)，并在最后发送确认的SMS或电子邮件消息.

知道Web调用将花费几分钟，尤其是在GSM网络压力很大的情况下，直接从Web线程调用它是没有意义的.

Consider for example you have a Web application that activates a user's state on a GSM network (e.g activate 4G plan) and sends a confirmatory SMS or email message at the end.

Knowing that the Web call would take several minutes - especially if the GSM network is stressed - it does not make sense to call it directly from the Web thread.

因此，基本上，当用户单击激活"时，服务器将返回类似感谢激活4G计划.您的计划将在几分钟内被激活，并且您会收到确认的SMS/电子邮件".

So basically, when a user clicks "Activate", the Server returns something like "Thanks for activating the 4G plan. Your plan will be activated in a few minutes and you will receive a confirmation SMS/email".

在这种情况下，您的服务器必须以异步方式生成一个新线程，最好使用线程池，然后立即将响应返回给用户.

In that case, you server has to spawn a new thread, ideally using a thread pool, in an asynchronous manner, and immediately return a response to the user.

工作流程:

1-用户单击激活"按钮
2- Servlet接收请求并在线程池中激活新的激活4G计划"任务.
3- Servlet立即向用户返回HTML响应，而无需等待任务完成.
4- Http事务结束
. .

1- User clicks "Activate" button
2- Servlet receives request and activates a new "Activate 4G Plan" task in a thread pool.
3- Servlet immediately returns an HTML response to the user without waiting for the task to be finalized.
4- End of Http transaction
. . .

异步地，稍后启动4G计划，并通过SMS或电子邮件等方式通知用户...

Asynchronously, the 4G plan gets activated later and the user gets notified through SMS or email, etc...

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