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JSF 面试题与答案

相关差异对比

相关差异对比

JSF vs JSPJSF 1.2 vs JSF 2.0JSF 2.0 vs JSF 2.1
Struts vs JSF

问题 1. What is JSF?

JSF stands for Java Server Faces. JSF has set of pre-assembled User Interface (UI). By this it means complex components are pre-coded and can be used with ease. It is event-driven programming model. By that it means that JSF has all necessary code for event handling and component organization. Application programmers can concentrate on application logic rather sending effort on these issues. It has component model that enables third-party components to be added like AJAX.

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问题 2. What is required for JSF to get started?

Following things required for JSF:

  • JDK (Java SE Development Kit)
  • JSF
  • Application Server (Tomcat or any standard application server)
  • Integrated Development Environment (IDE) Ex. Netbeans 5.5, Eclipse 3.2.x, etc.
Once JDK and Application Server is downloaded and configured, one can copy the JSF jar files to JSF project and could just start coding. If IDE is used, it will make things very smooth and will save your time.

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问题 3. What is JSF architecture?

JSF was developed using MVC (Model View Controller) design pattern so that applications can be scaled better with greater maintainability. It is driven by Java Community Process (JCP) and has become a standard. The advantage of JSF is that it has both a Java Web user and interface and a framework that fits well with the MVC. It provides clean separation between presentation and behavior. UI (User Interface) can be created by page author using reusable UI components and business logic part can be implemented using managed beans.

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问题 4. How JSF different from conventional JSP / Servlet Model?

JSF much more plumbing that JSP developers have to implement by hand, such as page navigation and validation. One can think of JSP and servlets as the assembly languages under the hood of the high-level JSF framework.

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问题 5. How the components of JSF are rendered? An Example

In an application add the JSF libraries. Further in the .jsp page one has to add the tag library like:
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%>

<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%>

Or one can try XML style as well:
<?xml version="1.0"?> <jsp:root version="2.0" xmlns:jsp="http://java.sun.com/JSP/Page" xmlns:f="http://java.sun.com/jsf/core" xmlns:h="http://java.sun.com/jsf/html">

Once this is done, one can access the JSF components using the prefix attached. If working with an IDE (Integrated Development Environment) one can easily add JSF but when working without them one also has to update/make the faces-config.xml and have to populate the file with classes i.e. Managed Beans between
<faces-config> </faces-config> tags

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