Spring 梳理 - javaConfig在App和webApp中的应用

1. package com.dxz.demo.configuration;
    
   import org.springframework.context.annotation.Configuration;
    
   @Configuration
   public class TestConfiguration {
       public TestConfiguration() {
           System.out.println("TestConfiguration容器启动初始化。。。");
       }
   }

2. APP
   1. 方法1

      1. package com.dxz.demo.configuration;
          
         import org.springframework.context.ApplicationContext;
         import org.springframework.context.annotation.AnnotationConfigApplicationContext;
          
         public class TestMain {
             public static void main(String[] args) {
          
                 // @Configuration注解的spring容器加载方式，用AnnotationConfigApplicationContext替换ClassPathXmlApplicationContext
                 ApplicationContext context = new AnnotationConfigApplicationContext(TestConfiguration.class);
          
                 // 如果加载spring-context.xml文件：
                 // ApplicationContext context = new
                 // ClassPathXmlApplicationContext("spring-context.xml");
             }
         }
          
         public static void main(String[] args) {
          
                 // @Configuration注解的spring容器加载方式，用AnnotationConfigApplicationContext替换ClassPathXmlApplicationContext
                 ApplicationContext context = new AnnotationConfigApplicationContext(TestConfiguration.class);
          
                 //获取bean
                 TestBean tb = (TestBean) context.getBean("testBean");
                 tb.sayHello();
             }

   2. 方法2

      1. public static void main(String[] args) {
           ApplicationContext ctx = new AnnotationConfigApplicationContext();
           ctx.register(AppContext.class)
         }

3. webApp
   1. 方法1

      1. <web-app>
             <context-param>
                 <param-name>contextClass</param-name>
                 <param-value>
                     org.springframework.web.context.
                     support.AnnotationConfigWebApplicationContext
                 </param-value>
             </context-param>
             <context-param>
                 <param-name>contextConfigLocation</param-name>
                 <param-value>
                     demo.AppContext
                 </param-value>
             </context-param>
             <listener>
                 <listener-class>
                     org.springframework.web.context.ContextLoaderListener
                 </listener-class>
             </listener>
             <servlet>
             <servlet-name>sampleServlet</servlet-name>
             <servlet-class>
                 org.springframework.web.servlet.DispatcherServlet
             </servlet-class>
             <init-param>
                 <param-name>contextClass</param-name>
                 <param-value>
                     org.springframework.web.context.
                     support.AnnotationConfigWebApplicationContext
                 </param-value>
             </init-param>
             </servlet>
         </web-app>

   2. 方法2

      1. package com.jt;
          
         import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
          
         public class AppInitializer   extends AbstractAnnotationConfigDispatcherServletInitializer{
               @Override
               protected Class<?>[] getRootConfigClasses() {
                 return new Class<?>[] { RootConfig.class };
               }
          
               @Override
               protected Class<?>[] getServletConfigClasses() {
                 return new Class<?>[] { WebConfig.class };
               }
          
               @Override
               protected String[] getServletMappings() {
                 return new String[] { "/" };
               }
          
             }