@SpringBootConfiguration注解

@SpringBootConfiguration继承自@Configuration，二者功能也一致，标注当前类是配置类，并会将当前类内声明的一个或多个以@Bean注解标记的方法的实例纳入到spring容器中，并且实例名就是方法名。

package com.lhkj.pluto.config;import java.util.HashMap;import java.util.Map;import org.springframework.boot.SpringBootConfiguration;import org.springframework.context.annotation.Bean;@SpringBootConfigurationpublic class Config {    @Bean    public Map createMap(){        Map map = new HashMap();        map.put("username","gxz");        map.put("age",27);        return map;    }}

package com.lhkj.pluto;import java.util.Map;import java.util.concurrent.TimeUnit;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.boot.context.embedded.EmbeddedServletContainerFactory;import org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory;import org.springframework.context.ConfigurableApplicationContext;import org.springframework.context.annotation.Bean;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;import com.lhkj.pluto.user.entity.User;/* * 发现@SpringBootApplication是一个复合注解， * 包括@ComponentScan，和@SpringBootConfiguration，@EnableAutoConfiguration *  */@RestController@SpringBootApplicationpublic class App {           @RequestMapping(value="/hello")    public String Hello(){        return "hello";    }            @Bean    public Runnable createRunnable() {        return () -> System.out.println("spring boot is running");    }    public static void main( String[] args )    {        System.out.println( "Hello World!" );        ConfigurableApplicationContext context = SpringApplication.run(App.class, args);        context.getBean(Runnable.class).run();        System.out.println(context.getBean(User.class));        Map map = (Map) context.getBean("createMap");   //注意这里直接获取到这个方法bean        int age = (int) map.get("age");        System.out.println("age=="+age);    }            @Bean    public EmbeddedServletContainerFactory servletFactory(){        TomcatEmbeddedServletContainerFactory tomcatFactory =                 new TomcatEmbeddedServletContainerFactory();        //tomcatFactory.setPort(8011);        tomcatFactory.setSessionTimeout(10,TimeUnit.SECONDS);        return tomcatFactory;            }}