基于XML的DI-byType方式的域属性自动注入

Spring基于XML的DI-byType方式的域属性自动注入

Student.java

package com.hk.spring.di08;

public class Student {

    private String name;
    private int age;
    private School school;//域属性
    public void setName(String name) {
        this.name = name;
    }
    public void setAge(int age) {
        this.age = age;
    }

    public void setSchool(School school) {
        this.school = school;
    }
    @Override
    public String toString() {
        return "Student [name=" + name + ", age=" + age + ", school=" + school
                + "]";
    }


}

School.java

package com.hk.spring.di08;

public class School {

    private String schloolName;

    public void setSchloolName(String schloolName) {
        this.schloolName = schloolName;
    }

    @Override
    public String toString() {
        return "School [schloolName=" + schloolName + "]";
    }

}

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="myMchool" class="com.hk.spring.di08.School">
        <property name="schloolName" value="红林小学"/>
    </bean>
    <!-- 域属性自动注入 autowire="byType"
        这种注入方式根据域属性类型到容器中查找具有is-a关系（包括子类）Bean进行自动注入
        要求相同类型的bean不能多于一个
    -->
    <bean id="myStudent" class="com.hk.spring.di08.Student" autowire="byType">
        <property name="name" value="张三"/>
        <property name="age" value="9"/>
    </bean>
</beans>

MyTest.java

package com.hk.spring.di08;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Mytest {
    @Test
    public void test1(){
        String resource = "com/hk/spring/di08/applicationContext.xml";
        ApplicationContext ac = new ClassPathXmlApplicationContext(resource);
        Student stu = (Student) ac.getBean("myStudent");
        System.out.println(stu);

    }
}