GreenNetBoyapril 09,2005 article 1. What is EJB2.EJB's production of 3. EJB Development 4.EJB Development Prospect (1) What is EJBEJB is an abbreviation of Enterprise Javabeans, which is a primary distributed component model for generating business applications. Specifically, EJB makes the business logic to separate the system-level service, so that the developers can concentrate on business issues. From the technical point of manufacture, EJB is the specification of the Java server-side service framework, which describes when building components A series of issues need to be solved, such as Scalable, Distributed, Transcational, Data Storage, Security (SECURITY). EJB technology defines a set of reusable components. Programmers can establish J2EE-based distributed applications (2) EJB production in 1998, SUN has released Enterprise JavaBeans (EJB). Specification, in the past seven years, EJB has been well popular and developed. And several versions evolve, now the highest version has reached EJB3.0, please see http://www.java.net/cs/user/forum/cs_disc/1838, this online discussion detailed The new features of EJB3.0 specification are discussed. Interested in seeing, but all English, maybe some difficulties. (3) EJB Development In the 1980s, the computing system usually consists of a large centralized non-distributed system consisting of a dumb-ended end of the mainframe. The PC does not change the calculation model, but the processing function is transferred to the user. The desktop, all components of the app are placed together, including data and user interfaces. This single-piece application cannot achieve sharing between users. At the end of the 2012, the client / server system appeared, it has been greatly After years of development, this two-layer architecture has not met the requirements, so that the current three-layer architecture and the N-layer system mechanism are produced, and this distributed application has been very popular with object-oriented development. Big development space, EJB as a middleware technology, catering to this developmental demand, and has powerful scalable items and security, EJB and J2EE are known as the most mature and most robust enterprise development model, developing large , Safety, scalable, scalable and transactional systems have played an irreplaceable role. For this importance and EJB complexity, EJB developers are also higher than others in salaries. Just like It was a family of "holding a scary salary" on 9CBS. (4) EJB development prospects EJB's advantage has been more detailed in the above development, how is its development prospect? EJB and COM and COM Compared to comparing, it can be said to be favorable, although in the past few years, EJB has been well developed, but the latest Hibernate and Spring technologies, due to great flexibility and simplicity, EJB VS appeared Spring, EJB VS Hibernate, the release of EJB3.0 is also in these confrontations in these confrontations, so that EJB is a technical specification in any case, ejb as a technical specification, in the future It will not lose its original design characteristics for a while, and it will not be hidden because of the emergence of a new technique, so from overall, EJB is still a good development space. I hope that I just started learning EJB and netizens. To learn this technical reference: << EJB Programming Guide >> (US) FAIZ Arni Electronic Industry Press
