(笔记)Spring 中的基本思想 ICO/DI(Dependency Injection)

参数注入方式

最新推荐文章于 2024-09-07 12:54:08 发布

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#Spring #Apple #XML

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本文介绍了两种在Java中进行依赖注入的方法：一种是通过setter方法注入，另一种是通过构造函数注入。setter注入方式通过设置属性的方式完成依赖注入；构造函数注入则是在创建对象时直接传入依赖。文中还提供了相应的ApplicationContext.xml配置示例。

How to inject the param?

There are two way...

[color=red][b]The first way:[/b][/color]
package Apple;

public class Apples {
AppleDao apple;

public AppleDao getApple() {
return apple;
}

public void setApple(AppleDao apple) {
this.apple = apple;
}

public void add(){
apple.addApple(1, "", "", 102);
apple.deleteApple(1);
}

}

[color=red]Show on ApplicationContext.xml[/color]
<beans>
<bean name="apple" class="Apple.AppleDaoImpl"></bean>
<bean name="apple2" class="Apple.AppleDaoImple"></bean>

<bean name="apples" class="Apple.Apples">
<property name="apple" ref="apple2"></property>
</bean>

</beans>

[color=red][b]The other one:[/b][/color]

package Apple;

public class Apples {
AppleDao apple;

[color=red]public void Apples(AppleDao apple) {
this.apple = apple;
}[/color]

public void add(){
apple.addApple(1, "", "", 102);
apple.deleteApple(1);
}

}

[color=red]Show on ApplicationContext.xml[/color]

<bean name="apples" class="Apple.Apples">
[color=red]<constructor-arg ref="apple2"></constructor-arg>[/color]</bean>