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【正文】 odel. In other words, it is inherently distributed and therefore the various parts of an application can run on different devices. Web applications developed using JavaServer Pages (JSP) may require some interaction with J2EE services. For example, a webbased inventory control system may need to access J2EE39。 encapsulate access to it。 Support for lvalue expression, which appear on the left hand side of an assignment operation. When used as an lvalue, an EL expression represents a reference to a data structure, for example: a JavaBeans property, that is assigned some user input. The new Unified EL is defined in its own specification document, which is delivered along with the JSP specification.Thanks to the Unified EL, JSTL tags, such as the JSTL iteration tags, can now be used with JSF ponents in an intuitive way.Java Servlet Technology OverviewServlets are the Java platform technology of choice for extending and enhancing Web servers. Servlets provide a ponentbased, platformindependent method for building Webbased applications, without the performance limitations of CGI programs. And unlike proprietary server extension mechanisms (such as the Netscape Server API or Apache modules), servlets are server and platformindependent. This leaves you free to select a best of breed strategy for your servers, platforms, and tools. Servlets have access to the entire family of Java APIs, including the JDBC API to access enterprise databases. Servlets can also access a library of HTTPspecific calls and receive all the benefits of the mature Java language, including portability, performance, reusability, and crash protection. Today servlets are a popular choice for building interactive Web applications. Thirdparty servlet containers are available for Apache Web Server, Microsoft IIS, and others. Servlet containers are usually a ponent of Web and application servers, such as BEA WebLogic Application Server, IBM WebSphere, Sun Java System Web Server, Sun Java System Application Server, and others. You might want to check out the latest information on JavaServer Pages (JSP) technology. JSP technology is an extension of the servlet technology created to support authoring of HTML and XML pages. It makes it easier to bine fixed or static template data with dynamic content. Even if you39。 A pluggable API for resolving variable references into Java objects and for resolving the properties applied to these Java objects, and, most importantly, ease of use. Today servlets are a popular choice for building interactive Web applications. Thirdparty servlet containers are available for Apache Web Server, Microsoft IIS, and others. Servlet containers are usually a ponent of Web and application servers, such as BEA WebLogic Application Server, IBM WebSphere, Sun Java System W
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