spring learning _____13 development using annotations

1. The need to add a profile in the Spring (the applicationContext.xml) in which:

<! - automatically scan packages at specified annotation -> 
< context: Scan-Component Base-Package = "com.xbf.demo" />

2. Next, create the entity classes directly in the corresponding packet, and adds the comment:

User . java

// equivalent to: add an object Spring container
 // <the bean ID = "User" class = "com.xbf.demo.User" /> 

the Component: Component Bean 
Contorller: Web Layer 
Service: service layer 
Repository: dao layer 

@Component ( "User" )
 public  class the User {
    public String name = "XBF" ; 
}

3.IOC injection:

3.1 may not be set to provide a method, @Value ( "attribute value") directly on the attribute name

@Component("user2")
public class User2{
     
    @Value("xbf2")
    private String name; 
}

//相当于：
<bean id="user2" class="com.xbf.Demo.User2">
    <property name="name"  value="xbf2"/>
</bean>

3.2 if set method, the above method is directly written in the set: @Value ( "attribute value")

@Controller("user2")
public class User2 {
    //    <bean class="com.kuang.demo.User2" id="user2">
    //        <property name="name" value="秦疆2号"/>
    //    </bean>


    private String name;

    public String getName() {
        return name;
    }
    
    @Value("秦疆")
    public void setName(String name) {
        this.name = name;
    }
}