问题描述
我现在正在阅读J2EE 1.4规范，有很多我不明白的术语会做什么.这来自容器的规范:
I'm reading J2EE 1.4 spec right now and there are lot of terms that I do not understand do what.This is from the specs for containers:
由于我来自Web开发领域，因此我无法掌握它的确切作用以及容器的用途.提供运行时支持是什么意思?就其可扩展性，体系结构而言，它如何使J2EE成为更好的系统?
Since I come from web development world, I'm not able to grasp, what exactly does this do and what is the purpose of a container. What is meant by providing run time support? How does it make a J2EE a better system in terms or scalability, architecture?
推荐答案
J2EE/Java EE应用程序不是自包含的.为了执行，需要在容器中部署.换句话说，容器在JVM之上提供了一个执行环境.
J2EE/Java EE applications aren't self contained. In order to be executed, they need to be deployed in a container. In other words, the container provides an execution environment on top of the JVM.
此外，应用程序依赖于几个API，例如JPA，EJB，Servlet，JMS，JNDI等.EE兼容容器的作用是为所有或某些API提供标准实现.这意味着从理论上讲，只要依赖标准API，您就可以在任何容器的顶部运行应用程序.
Also, applications rely on several APIs like JPA, EJB, servlet, JMS, JNDI, etc. The role of the EE compliant container is to provide a standard implementation of all or some of these APIs. This means you can theoretically run your application on top of any container as long as it relies on standard APIs.
从技术角度来看，容器只是具有main()方法的另一个Java SE应用程序.另一方面，EE应用程序是service/beans/servlets/etc的集合.容器找到这些组件并运行它们，从而提供API实现，监视，可伸缩性，可靠性等.
From a technical perspective, a container is just another Java SE application with a main() method. EE applications on the other hand are a collection of services/beans/servlets/etc. The container finds these components and runs them, providing API implementations, monitoring, scalability, reliability and so on.
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