Spring中Bean的装配方式

一、基于xml的装配

Student.java

package com.yh;

public class Student implements People {

    public void breath() {
        System.out.println("呼吸");
    }
}

XML配置

<?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:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
     http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
     http://www.springframework.org/schema/context
     http://www.springframework.org/schema/context/spring-context-4.1.xsd">

     <bean id="student" class="com.yh.Student"></bean>

</beans>

测试

@Test
public void demo01() {
    String xmlPath = "applicationContext.xml";
    ApplicationContext context = new ClassPathXmlApplicationContext(xmlPath);
    Student stu = (Student) context.getBean("student");
    stu.breath();
}

二、基于Annotation（注解）的装配

Student,java

package com.yh;

import org.springframework.stereotype.Component;
@Component
public class Student implements People {

    public void breath() {
        System.out.println("呼吸");
    }
}

XML配置

<?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:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
     http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
     http://www.springframework.org/schema/context
     http://www.springframework.org/schema/context/spring-context-4.1.xsd">

    <context:component-scan base-package="com.yh"></context:component-scan>

</beans>

测试

@Test
public void demo01() {
    String xmlPath = "applicationContext.xml";
    ApplicationContext context = new ClassPathXmlApplicationContext(xmlPath);
    Student stu = (Student) context.getBean("student");
    stu.breath();
}