Spring使用注解开发步骤：

  1. 创建项目
  2. 创建配置文件
    1. 　　 
      <?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd
        ">
    <context:component-scan base-package="com.zhangsan.pojo"></context:component-scan>
    <context:annotation-config></context:annotation-config>
    <bean id="user1111" class="com.jiabowen.pojo.User" autowire="byType"></bean>
</beans>
  3. 创建类
    1. 　　 
      @Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
    @Value("张三")
    private String userName;
    @Value("23")
    private Integer userAge;
}

       

  4. 在配置文件中添加开启注解扫描和扫描哪个包
  5. 测试
    1. 　 
          @Test
    public void test1(){
        ApplicationContext context = new ClassPathXmlApplicationContext("ApplicationContext.xml");
        User user = context.getBean("user1111", User.class);
        System.out.println(user);
    }