hibernate+gwt2.4
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标题“hibernate+gwt2.4”指的是一个基于Google Web Toolkit (GWT) 2.4版本与Hibernate ORM框架的集成应用示例。这个项目可能是为了展示如何在GWT前端应用程序中有效地利用Hibernate来处理后端数据库操作。GWT是一种用于构建高性能、富客户端Web应用的开发工具,而Hibernate则是一个流行的Java对象关系映射(ORM)框架,它简化了Java应用对关系数据库的访问。 在GWT和Hibernate的集成中,开发者通常会将业务逻辑和数据访问层(DAO)实现为GWT服务,这些服务在服务器端运行,并通过GWT的Remote Procedure Call (RPC)机制与客户端交互。GWT编译器会将Java代码转换成优化过的JavaScript,使得用户可以在浏览器中执行复杂的客户端逻辑,而无需频繁地与服务器通信。 **关于Hibernate的知识点:** 1. **对象关系映射(ORM)**:Hibernate允许开发者用面向对象的方式来操作数据库,将数据库表映射为Java对象,反之亦然。 2. **配置文件(hibernate.cfg.xml)**:定义数据库连接信息、方言、缓存策略等。 3. **实体类(Entity)**:代表数据库表,使用`@Entity`注解标识,属性对应表字段,`@Id`注解标识主键。 4. **Session接口**:持久化操作的主要接口,负责对象的创建、读取、更新和删除(CRUD)。 5. **Criteria查询**:一种动态构建SQL的方式,无需直接写SQL语句。 6. **HQL(Hibernate Query Language)**:面向对象的查询语言,类似于SQL,但更接近Java。 7. **二级缓存**:可选特性,提高性能,缓存常用数据,减少数据库访问。 **关于GWT的知识点:** 1. **模块系统(Module System)**:GWT项目由一个或多个模块组成,每个模块定义了应用的入口点、依赖和编译设置。 2. **UI组件库**:包含丰富的可重用组件,如Button、TextBox、Panel等,用于构建用户界面。 3. **编译过程**:GWT编译器将Java源代码编译成优化的JavaScript,支持本地方法服务(如日期和时间处理)。 4. **异步通信(Asynchronous Communication)**:GWT使用RPC实现客户端和服务器的异步通信,避免页面刷新。 5. **CSS支持**:可以编写样式表来控制UI外观,支持主题切换。 6. **GWT Designer**:一些IDE(如Eclipse)提供了GWT设计器,帮助可视化构建用户界面。 7. **开发模式(Development Mode)**:提供快速调试功能,允许实时查看代码更改效果。 在这个“hibernate+gwt2.4”的示例中,可能包含了一个简单的GWT客户端应用,它调用了服务器端的Hibernate服务进行数据操作。`Hibernate`文件可能包含了Hibernate的相关配置和实体类,而`demo`文件可能包含了GWT项目的源代码,包括UI组件、服务接口和服务实现。通过学习和分析这个示例,开发者可以更好地理解如何在实际项目中结合使用GWT和Hibernate,提升Web应用的开发效率和用户体验。
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- 1
- 2
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- zwhnd2012-12-30没配置通,要是有个说明文档就好了
- upzhang20112012-10-09挺不错的demo,适合初学者学习。
- koala_boy2013-06-06做的这么乱,权当丢了
- 南漂程序员2013-07-03一般般 , 适合初学者的
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