spring在web中的应用

//classpath:路径需要根据自己所放置的applicationContext.xml文件的位置
<listener>
   <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

<context-param>
   <param-name>contextConfigLocation</param-name>
   <param-value>classpath:spring/application.xml</param-value>
</context-param>

//base-package：是包的全路径
<!-- 开启注解开发 -->
<context:annotation-config/>
    
<!-- 在类中写了注解。还需要进行包的扫描找到 -->
<context:component-scan base-package="dao"></context:component-scan>

@Component("testways")　　//使用注解的方法，进行类的调用
public class testways {

    public String test() {
        return "我是一个测试spring在web中应用的例子";
    }
}

@WebServlet("/textspring")
public class testspring extends HttpServlet {
    
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
        //获取WebApplicationContext
        WebApplicationContext wa = WebApplicationContextUtils.getWebApplicationContext(getServletContext());
        
        testways bean = (testways) wa.getBean("testways");
        String test = bean.test();
        
        System.out.println(test);
    }
}