JSF 2.0 开发实战指南

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"JSF 2.0 开发资料，包括一本名为《JSF2.0 Cookbook》的书籍，由Anghel Leonard编写，由Birmingham-Mumbai的Packt Publishing出版。这本书提供了超过100个简单但极其有效的JSF应用程序控制食谱，旨在帮助开发者深入理解和实践JSF 2.0技术。" JSF（JavaServer Faces）是Java平台上的一个用于构建用户界面的MVC（模型-视图-控制器）框架。JSF 2.0 是该框架的一个重要版本，它带来了许多改进和新特性，使得开发更高效、更易于维护。 1. **组件库增强**：JSF 2.0 引入了更多的内置UI组件，如数据表、图表和日期选择器，这些组件极大地丰富了开发者构建用户界面的选择。同时，JSF 2.0 提供了对Facelets的支持，这是一种更现代、更强大的视图层技术，替代了之前的JSP视图。 2. **Faces Flow**：JSF 2.0 引入了Faces Flow的概念，这是一种导航和流程管理机制，允许开发者更好地组织和控制应用中的多个页面和步骤。 3. **异步处理**：JSF 2.0 支持Ajax（异步JavaScript和XML），允许部分页面更新，提升用户体验。开发者可以使用`<f:ajax>`标签或第三方库如PrimeFaces来实现。 4. **CDI集成**：JSF 2.0 集成了Contexts and Dependency Injection (CDI)框架，这使得JSF组件可以直接利用CDI的依赖注入特性，提高了组件的可测试性和可维护性。 5. **视图状态管理**：在JSF 2.0 中，视图状态的管理得到了优化，可以更有效地处理大量组件的应用，减少了服务器内存的占用。 6. **FacesMessage改进**：JSF 2.0 的FacesMessage API提供了更强大的错误处理和用户反馈功能，支持多消息和分类。 7. **自定义标签库**：开发者可以通过创建自定义组件和标签库，扩展JSF的功能，实现特定业务需求。 8. **Faces Servlet自动注册**：在JSF 2.0 中，Faces Servlet会自动注册，简化了配置。 9. **单页应用程序支持**：JSF 2.0 通过提供更好的Ajax支持和更灵活的导航结构，能够更好地支持单页应用程序（SPA）的开发。 10. **生命周期管理**：JSF组件的生命周期管理在JSF 2.0 中更加明确和可控，包括初始化、渲染和处理事件等各个阶段。《JSF2.0 Cookbook》这本书提供的100多个食谱，将帮助开发者掌握上述特性，解决实际开发中遇到的问题。书中可能包含如何使用Facelets创建模板、如何实现Ajax交互、如何管理组件状态、如何进行CDI集成等实用示例，旨在提升开发者在JSF 2.0环境下的开发技能。

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Using Standard and Custom Converters in JSF

Introduction

Data conversion is the process of converting/transforming one data type into another. Before

going further and analyzing some aspects of JSF converters, let's see what they actually are

and what they are good for.

For this, let's take an example of a web application in which the user has to ll up a simple

form with some information, such as name, age, and date of birth. The server component

of our application will receive this information as strings, even if we know that they are a

string (the name), an integer (the age), and a date (the date of birth). This is the phase when

JSF converters enter into the scene and convert the user input according to application

requirements. If the submitted information is not successfully converted then the form is

redisplayed (this time an attention message is also displayed) and the user can rell the form.

The case repeats until the submitted information is successfully converted to the correct type.

In addition, you should know that JSF provides a set of standard converters (used for the

most common conversions) and the possibility to dene your own converters, known as

custom converters (this kind of converters are very useful when the standard converters can't

accomplish the desired conversions). Speaking of standard converters, the following are the

most used converters:

Converter IDs Converter class

javax.faces.Byte javax.faces.convert.ByteConverter

javax.faces.Float javax.faces.convert.FloatConverter

javax.faces.BigInteger javax.faces.convert.BigIntegerConverter

javax.faces.BigDecimal javax.faces.convert.BigDecimalConverter

javax.faces.Character javax.faces.convert.CharacterConverter

javax.faces.DateTime javax.faces.convert.DateTimeConverter

javax.faces.Boolean javax.faces.convert.BooleanConverter

javax.faces.Double javax.faces.convert.DoubleConverter

javax.faces.Long javax.faces.convert.LongConverter

javax.faces.Short javax.faces.convert.ShortConverter

javax.faces.Integer javax.faces.convert.IntegerConverter

Some JSF tags that support converters are as follows:

<h:outputText>

<h:outputLink>

<h:selectManyListbox>

<h:selectMaynyMenu>

<h:inputTextarea>

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