目录

1.添加pom

2.配置web.xml   spring.xml

4.配置在创建一个类实现ServletContextListener

5.配置servlet

---

1.添加pom

<dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-context</artifactId>

<version>5.3.29</version>

</dependency>

<dependency>

<groupId>javax.servlet</groupId>

<artifactId>javax.servlet-api</artifactId>

<version>4.0.1</version>

<scope>provided</scope>

</dependency>

<dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-web</artifactId>

<version>5.3.29</version>

</dependency>

2.配置web.xml   spring.xml

web.xml

<web-app>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

spring

<context:component-scanbase-package="com.hu"/>

4.配置在创建一个类实现ServletContextListener

创建一个类实现ServletContextListener

将创建好的ApplicationContext存储到ServletContext域中，这样整个web层任何位置就都可以获取到了

服务器一启动就执行Initial方法这个方法是整个web最先执行的

*sce就是全局对象servletContext

public class MyListener implements ServletContextListener {@Overridepublic void contextInitialized(ServletContextEvent sce) {ServletContext servletContext = sce.getServletContext();String contextConfigLocation = servletContext.getInitParameter("contextConfigLocation");contextConfigLocation = contextConfigLocation.substring("classpath".length());ApplicationContext applicationContext = new ClassPathXmlApplicationContext(contextConfigLocation);servletContext.setAttribute("applicationContext",applicationContext);}

5.配置servlet

@WebServlet("/login")
publicclassLoginControllerextendsHttpServlet{
@Override
protectedvoiddoGet(HttpServletRequestreq,HttpServletResponseresp)throwsServletException,IOException{
//ServletContextservletContext=this.getServletContext();
ServletContextservletContext=req.getServletContext();
WebApplicationContextwebApplicationContext=WebApplicationContextUtils.getWebApplicationContext(servletContext);
UserServicebean=webApplicationContext.getBean("us",UserService.class);
bean.show();
}