6_Spring_Bean的自动装配
6_Spring_Bean的自动装配
bean自动装配
通过property标签可以手动指定给属性进行注入
我们也可以通过自动转配,完成属性的自动注入,就是自动装配,可以简化DI的配置
准备实体类
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package com.msb.bean;
-
/**
-
- @Author: Ma HaiYang
-
- @Description: MircoMessage:Mark_7001
-
*/
-
public class Dept {
-
}
-
package com.msb.bean;
-
/**
-
- @Author: Ma HaiYang
-
- @Description: MircoMessage:Mark_7001
-
*/
-
public class Emp {
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private Dept dept; -
@Override -
public String toString() { -
return "Emp{" + -
"dept=" + dept + -
'}'; -
} -
public Dept getDept() { -
return dept; -
} -
public void setDept(Dept dept) { -
this.dept = dept; -
} -
public Emp() { -
} -
public Emp(Dept dept) { -
this.dept = dept; -
} -
}
配置文件
- <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:c="http://www.springframework.org/schema/c" -
xsi:schemaLocation="http://www.springframework.org/schema/beans -
http://www.springframework.org/schema/beans/spring-beans.xsd"> -
<bean id="dept" class="com.msb.bean.Dept"></bean> -
<!-- -
autowire 属性控制自动将容器中的对象注入到当前对象的属性上 -
byName 根据目标id值和属性值注入,要保证当前对象的属性值和目标对象的id值一致 -
byType 根据类型注入,要保证相同类型的目标对象在容器中只有一个实例 -
--> -
<bean id="emp" class="com.msb.bean.Emp" autowire="byName"></bean>
测试代码
- package com.msb.test;
- import com.msb.bean.Emp;
- import com.msb.bean.User;
- import org.junit.Test;
- import org.springframework.context.support.ClassPathXmlApplicationContext;
- /**
-
- @Author: Ma HaiYang
-
- @Description: MircoMessage:Mark_7001
- */
- public class Test2 {
-
@Test -
public void testGetBean(){ -
ClassPathXmlApplicationContext("applicationContext2.xml");ClassPathXmlApplicationContext context =new -
Emp emp = context.getBean("emp", Emp.class); -
System.out.println(emp); -
} - }
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