j2ee初学者需要理解的问题（J2EE beginners need to understand the problem）.docVIP

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j2ee初学者需要理解的问题（J2EE beginners need to understand the problem）.doc

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j2ee初学者需要理解的问题（J2EE beginners need to understand the problem）

j2ee初学者需要理解的问题（J2EE beginners need to understand the problem） A, J2EE background 1, the needs of enterprise application framework In many enterprise applications, such as database connection, mail services, transaction processing and so on are some general enterprise demand module, these modules and if every time in the development by developers to complete it will cause problems of long development cycle and code * etc.. So many large companies developed their service module. The service software series called middleware. 2, in order to general must provide specification, or can not reach the general On the basis of the above requirements, many companies have developed their own middleware, but its communication with users are different, which leads to the user of each company cannot be assembled on a different middleware for their services. In order to produce the bottleneck. The concept and put forward the standard. In fact, J2EE is based on a series of standard JAVA technology. Note: the interpretation of Middleware in the operating system and a higher level of application. He plays the functions: application running environment and operating system in order to achieve isolation, application developers do not have to worry about more system problems, and directly concerns the ability of the application in solving problems. A concept that is behind us container middleware. Two, relevant terminology Container: as the role of Middleware WEB container: in which application components (JSP, SERVLET) to provide an environment that makes the JSP environment variable interface SERVLET more directly in the container, do not have to pay attention to other system problems. The main WEB server to achieve. For example: TOMCAT, WEBLOGIC, WEBSPHERE etc.. The container provides the interface to strictly abide by the norms of J2EE WEB APPLICATION. We comply with the above standard WEB server called WEB container in J2EE. EJB: Enterprise java bean container vessel. Has the indust