- why
Normally, thin-client multitiered applications are hard to write because they involve many lines of intricate code to handle transaction and state management, multithreading, resource pooling, and other complex low-level details. The component-based and platform-independent Java EE architecture makes applications easy to write because business logic is organized into reusable components. In addition, the Java EE server provides underlying services in the form of a container for every component type. Because you do not have to develop these services yourself, you are free to concentrate on solving the business problem at hand.
通常，瘦客户端多层应用程序很难编写，因为它们涉及许多复杂的代码来处理事务和状态管理，多线程，资源池和其他复杂的低级细节。 基于组件和独立于平台的Java EE体系结构使应用程序易于编写，因为业务逻辑被组织成可重用的组件。 此外，Java EE服务器以每个组件类型的容器形式提供底层服务。 因为您不必自己开发这些服务，所以您可以集中精力解决手头的业务问题。
- Container Types
The server and containers are as follows:
-
Java EE server: The runtime portion of a Java EE product. A Java EE server provides EJB and web containers.
-
EJB container: Manages the execution of enterprise beans for Java EE applications. Enterprise beans and their container run on the Java EE server.
-
Web container: Manages the execution of web pages, servlets, and some EJB components for Java EE applications. Web components and their container run on the Java EE server.
-
Application client container: Manages the execution of application client components. Application clients and their container run on the client.
-
Applet container: Manages the execution of applets. Consists of a web browser and a Java Plug-in running on the client together.
服务器和容器如下：
- Java EE服务器：Java EE产品的运行时部分。 Java EE服务器提供EJB和Web容器。
- EJB容器：管理Java EE应用程序的企业bean的执行。 Enterprise Bean及其容器在Java 服务器上运行。
- Web容器：管理Java EE应用程序的Web页面，servlet和一些EJB组件的执行。 Web组件及其容器在Java EE服务器上运行。
- 应用程序客户端容器：管理应用程序客户端组件的执行。 应用程序客户端及其容器在客户端上运行。
- Applet容器：管理applet的执行。 由一个Web浏览器和一个在客户端上运行的Java Plug-in组成。
-
history
- trend
- future