The basic knowledge points are as follows:

• Introduce annotation constraints and configure component scanning
• Annotation on class: @ response @ Controller @Service @Repository
• Annotation @ value of common attribute
• Annotation @ Resource @ Autowired @ Qualifier for object properties
• Bean life cycle, initialization and destruction: @ PostConstruct @ PreDestroy
• Bean scope: @ Scope("prototype"). The default is singleton

1. Create a web project to introduce jar package

In addition to the basic six packages of IOC, the package of AOP development is introduced

2. Introduce the configuration file of spring

• Create applicationContext3.xml
• Introducing constraints: using annotation development to introduce context constraints
• file:///D:/Hibernate/Spring/spring-framework-4.2.4.RELEASE/docs/spring-framework-reference/html/xsd-configuration.htm

<!-- ========================Introduce spring About annotation development context constraint======================== -->
<?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 
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context.xsd">


</beans>

3. Create interface and implementation classes and test classes

package spring.day2.demo1;

public interface UserDao {
    public void save();
}

package spring.day2.demo1;

public class UserDaoImp1 implements UserDao {

    @Override
    public void save() {
        System.out.println("userdao Of save Method executed.......");
    }

}

package spring.day2.demo1;

import org.junit.Test;

/*
 * IOC Introduction to annotation development
 */
public class SpringDemo1 {
    @Test
    /*
     * Traditional way
     */
    public void demo1() {
        UserDao userDao = new UserDaoImp1();
        userDao.save();
    }
}

4. Configure IOC component scanning in the configuration file to confirm which classes under which packages need annotations

5. Add notes

6. Add the following code to the test class

@Test
    /*
     * IOC Annotation method of
     */
    public void demo2() {
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext3.xml");
        UserDao bean = (UserDao) applicationContext.getBean("userDao");
        bean.save();
    }