Spring- using annotations Development (xii)

1. Use annotations need to import to develop a series of spring package;

2. The need to add a constraint profile: context;

xmlns:context="http://www.springframework.org/schema/context"
http://www.springframework.org/schema/context  https://www.springframework.org/schema/context/spring-context.xsd

3. Configure scanning assembly

     <! - annotations in the automatic scan package -> 
    < context: Scan-Component Base-Package = "org.west.pojo" />

4. Write code

package org.west.pojo;

import org.springframework.stereotype.Controller;

@Controller("stu")
public class Student {

    public String name="喜洋洋";

}

5. Test

public class testor {

    @Test
    public void test(){
    ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        Student stu = (Student) context.getBean("stu");
        System.out.println(stu.name);
    }
}

IOC injection

1. The set method can not provide, can be added directly on a @values ​​attribute name (value);

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;

@Controller("stu2")
public class Student {
     @Value("灰太狼")
    private String name;

    public String getName() {
        return name;
    }

}

Such values ​​can also be injected into it.

 

2. The method set may be added @values ​​(value) set directly on the above method may also be injected into the right value

@Controller("stu2")
public class Student {

    private String name;

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

Annotations and XML Comparison

• xml can be applied to any scene, clear structure.

• Notes not provide their own class, there are limitations; benefits: the development of simple, convenient