Spring集成Web环境搭建

2025/6/28 5:38:53 来源：https://blog.csdn.net/Hellyc/article/details/146571358 浏览: 次关键词：Spring集成Web环境搭建

一、自行创建监听器来模拟springweb架构中的监听器流程

监听器的作用：当web服务器开始启动时，使用监听器监听初始化周期，并将spring配置文件放置在Servlet的最大域中。一旦服务器启动后就可以直接从域中使用gertAtribute方法去获取到spring的配置文件applicationContext.xml。

然后会设置一个工具类，通过工具类作为中介来返回配置文件信息。

自行配置逻辑应是如下：

首先是Controller层

public class UserController extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throwsServletException, IOException {//调用applicationContext配置文件首先通过工具类WebApplicationContextUtils//再通过该类中的getApplicationContext从最大域中获得监听器上传的getApplicationContext配置文件内容//调用顺序为:WebApplicationContextUtils  ->  getApplicationContext// ->  (ApplicationContext) servletContext.getAttribute("applicationContext")ApplicationContext applicationContext =WebApplicationContextUtils.getApplicationContext(req.getServletContext());userService = (UserService) applicationContext.getBean("userService");userService.save();}

然后是web.xml配置文件

<web-app><display-name>Archetype Created Web Application</display-name>
  <context-param><param-name>contextConfigLocation</param-name><param-value>applicationContext.xml</param-value></context-param>
<!--  监听器配置--><listener><listener-class>listener.ContextLoaderListener</listener-class></listener>
  <servlet><servlet-name>UserController</servlet-name><servlet-class>com.hxy.usercontroller.UserController</servlet-class></servlet><servlet-mapping><servlet-name>UserController</servlet-name><url-pattern>/userController</url-pattern></servlet-mapping>
</web-app>

监听器类的创建

public class ContextLoaderListener implements ServletContextListener {@Overridepublic void contextInitialized(ServletContextEvent sce) {ServletContext servletContext = sce.getServletContext();String contextConfigLocation = servletContext.getInitParameter("contextConfigLocation");sce.getServletContext().setAttribute("applicationContext", contextConfigLocation);System.out.println("ContextLoaderListener contextInitialized");}@Overridepublic void contextDestroyed(ServletContextEvent sce) {}
}
工具类的创建

//设置一个工具，用于返回spring配置类：applicationContext
//外部只需要调用这个类的方法getApplicationContext，就能够得到返回的applicationContext
public class WebApplicationContextUtils {public static ApplicationContext getApplicationContext(ServletContext servletContext) {return (ApplicationContext) servletContext.getAttribute("applicationContext");}
}