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spring学习1:1.基于注解的bean

时间:2018-09-17 00:58:07      阅读:197      评论:0      收藏:0      [点我收藏+]

标签:bean   void   利用   注册   property   实体   学习   conf   utf-8   

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
  <!-- 以前(很久)利用bean注册组件(实体类) id方便在容器中获取 -->
  <bean id="person" class="com.bean.Person">
  <property name="age" value="18"></property>
  <property name ="name" value="zhangsan"></property>
</bean>
</beans>

//以前配置文件的方式(bean.xml)-->被替换成了类(看上面)
@Configuration //告诉Spring这是一个配置类
public class Mainconfig {

//给容器注册一个bean;类型为返回值类型,id默认为方法名
@Bean("person1")//指定id名
public Person person() {
  return new Person("王五", 10);
  }

}

/**/测试

public class MainTest {
public static void main(String[] args) {
  //以前通过加载配置文件去获取
  /*ApplicationContext applicationContext = new ClassPathXmlApplicationContext("bean.xml");
  Person bean = (Person) applicationContext.getBean("person");
  System.out.println(bean);*/
  /*out
  * Person [name=zhangsan, age=18]
  */
//基于注解的config
  AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext(Mainconfig.class);
  Person bean = applicationContext.getBean(Person.class);
  System.out.println(bean);
  /*out
  * Person [name=王五, age=10]
  */
  //获取所有bean的id名
  String[] beanname = applicationContext.getBeanNamesForType(Person.class);
  for (String name : beanname) {
    System.out.println(name);
  }

   /*out

  person1

  */
  }

}

spring学习1:1.基于注解的bean

标签:bean   void   利用   注册   property   实体   学习   conf   utf-8   

原文地址:https://www.cnblogs.com/FellHappy/p/9658555.html

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