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目录

Javaweb三大组件及环境特点

Spring整合web环境的思路及实现

Spring的web开发组件spring-web

MVC框架思想及其设计思路

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Javaweb三大组件及环境特点

 

Spring整合web环境的思路及实现

 

package com.xfy.listener;import com.xfy.config.SpringConfig;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;public class ContextLoaderListenter implements ServletContextListener {private  String CONTEXT_CONFIG_LOCATION="ContextConfigLocation";@Overridepublic void contextInitialized(ServletContextEvent servletContextEvent) {ServletContext servletContext = servletContextEvent.getServletContext();String initParameter = servletContext.getInitParameter(CONTEXT_CONFIG_LOCATION);
//        initParameter=initParameter.substring("classpath".length());//1.创建Spring容器ApplicationContext applicationContext=new ClassPathXmlApplicationContext(initParameter);//2.将容器存入ServletContext中servletContext.setAttribute("applicationContext",applicationContext);}@Overridepublic void contextDestroyed(ServletContextEvent servletContextEvent) {}
}public class WebAppLicationContext {public  static ApplicationContext getWebAppLicationContext(ServletContext servletContext){ApplicationContext applicationContext = (ApplicationContext) servletContext.getAttribute("applicationContext");return applicationContext;}
}@WebServlet(urlPatterns = "/accountServlet")
public class AccountServlet extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {ApplicationContext applicationContext =  WebAppLicationContext.getWebAppLicationContext(request.getServletContext());AcountService bean = applicationContext.getBean(AcountService.class);bean.transforMoney("tom","lucy",500);}

 

Spring的web开发组件spring-web

 Spring其实已经为我们定义好了一个ContextLoaderListener，使用方式跟我们上面自己定义的大体一样

 先导入Spring-web的坐标

    <dependency><groupId>org.springframework</groupId><artifactId>spring-web</artifactId><version>5.2.5.RELEASE</version></dependency><listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener>

 

<?xml version="1.0" encoding="UTF-8"?>
<web-app>
<!--    定义全局参数  --><context-param><param-name>contextClass</param-name><param-value>com.xfy.config.MyxfyApplicationContext</param-value></context-param><listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener>
</web-app>

 

MVC框架思想及其设计思路