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Curso de Struts2: Unidad Didáctica 00 Introduccion

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Introducción al curso de Struts2

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Curso de Struts2: Unidad Didáctica 00 Introduccion

  1. 1. Curso de Struts 2 Unidad Didáctica 00 Introducción David Vaquero
  2. 2. Objetivos Conocer las bondades del framework Struts Saber dónde encontrar información sobre el framework Saber cómo configurar un proyecto struts
  3. 3. Índice de contenidos Introducción Características Componentes
  4. 4. Introducción La página principal del framework es: http://struts.apache.org/development/ 2.x/
  5. 5. Características Es un framework basado en la arquitectura de J2EE Permite la integración mediante el uso de Servlets y JSP Tiene la función principal de un framework de presentación pero permite la gestión de la lógica de la programación de la aplicación Permite integrar otros frameworks que facilitan la gestión de plantillas como por ejemplo Velocity
  6. 6. Componentes FilterDispatcher: Se encarga de gestionar las peticiones que llegan al framework Actions: maneja distintos tipos de petición Interceptors: permite ejecutar código común entre distintas acciones Results: Permite presentar los resultados de la petición al usuario
  7. 7. Componentes
  8. 8. Componentes: proceso 1. El navegador web lanza una petición que maneje struts. La petición es capturada por el Dispatcher 2. Se aplican los interceptores, validaciones, flujos de trabajo, subidas de archivos… 3. Se ejecuta la Action con el método execute 4. El action indica que result es el que debe aplicarse 5. Se aplican los interceptores pero en orden inverso 6. El resultado pasa de vuelta por el Dispatcher 7. El resultado es visualizado por parte del usuario
  9. 9. Componentes: Action Las acciones son mapeadas a una URL Es una clase normal que tiene un método que no recibe parámetro y o bien devuelve una String o un Result Cuando devuelve una String el Result se define por configuración Hay dos modos de implementación: Implementar la interfazcom.opensymphony.xwork2.Action o Heredar de com.opensymphony.xwork2.ActionSupport En este caso implementa el interfaz y dispone del método execute y devuelve un SUCCESS
  10. 10. Componentes: Action: Interfaz public interface Action { public static final String SUCCESS = "success"; public static final String NONE = "none"; public static final String ERROR = "error"; public static final String INPUT = "input"; public static final String LOGIN = "login"; public String execute() throws Exception; }
  11. 11. Componentes: Result Indicará donde pasaremos la respuesta Dependiendo del tipo de Result nos llevará a un componente o a otro Esto nos permitirá presentar por ejemplo un JSP de resultado El tipo por defecto es dispatcher Podemos asociar distintos results dependiendo de condiciones, por ejemplo si un formulario valida o no

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