最新網(wǎng)頁(yè)設(shè)計(jì)外文翻譯-在線瀏覽
2024-08-09 03:18本頁(yè)面
【正文】 ly into a Web server framework and can be used to extend the capabilities of a Web server with minimal overhead, maintenance, and support. Unlike other scripting languages, servlets involve no platformspecific consideration or modifications。 they are application ponents that are downloaded, on demand, to the part of the system that needs them. Together, JSP technology and servlets provide an attractive alternative to other types of dynamic Web scripting/programming by offering: platform independence。 separation of logic from display。 extensibility into the enterprise。s highly scalable architecture for enterprise applications.JSP Technology in the Java EE 5 PlatformThe focus of Java EE 5 has been ease of development by making use of Java language annotations that were introduced by J2SE . JSP supports this goal by defining annotations for dependency injection on JSP tag handlers and context listeners.Another key concern of the Java EE 5 specification has been the alignment of its webtier technologies, namely JavaServer Pages (JSP), JavaServer Faces (JSF), and JavaServer Pages Standard Tag Library (JSTL).The oute of this alignment effort has been the Unified Expression Language (EL), which integrates the expression languages defined by JSP and JSF .The main key additions to the Unified EL that came out of tbe alignment work have been: Support for deferred expressions, which may be evaluated by a tag handler when needed, unlike their regular expression counterparts, which get evaluated immediately when a page is executed and rendered, and re fortable writing servlets, there are several pelling reasons to investigate JSP technology as a plement to your existing work.JavaBeansJavaBeans technology is the ponent architecture for the Java 2 Platform, Standard Edition (J2SE). Components (JavaBeans) are reusable software programs that you can develop and assemble easily to create sophisticated applications. JavaBeans technology is based on the JavaBeans specification. The Bean BuilderThe Bean Builder is a simple ponent assembler that demonstrates the visual construction of applications using ponent assembly mechanisms. JavaBeans Activation Framework (JAF)JAF lets you take advantage of standard services to: determine the type of an arbitrary piece of data。 discover the operations available on it。s directory services to gain access to a database. Or you may want to use Enterprise JavaBeans (EJB) in your application. This article presents a brief overview of J2EE, then it shows how to: Reference J2EE services s presentation logic, and responds to requests from the client (such as the web browser). The EJB container, on the other hand, hosts application ponents that respond to requests from the web tier as shown in Figure 1. Figure 1: Multitier Applicat
語(yǔ)文相關(guān)推薦
鄂ICP備17016276號(hào)-1