Spring中依赖注入(DI)几种方式解读

public Student(String myname,int myage,School myXueXiao){
System.out.print1n( "student的有参数构造方法");
this.name = myname;
this.age = myage;
this.school= myXueXiao;
}

 
<!--使用name属性实现构造注入-->
<bean id="myStudent" class="com.bit.ba03.Student" >
<constructor-arg name="myage" value="20" />
<constructor-arg name="mySchool" ref="myXueXiao" />
<constructor-arg name="myname" value="周良"/>
</bean>
<!--使用index属性-->
<bean id="myStudent2" class="com.bit.ba03.Student">
<constructor-arg index="1" value="22" />
<constructor-arg index="0" value="李四" />
<constructor-arg index="2" ref="myXueXiao" />
</bean>
<!--省略index，顺序不能乱写了-->
<bean id="myStudent3" class="com.bit.ba03.Student">
<constructor-arg value="张强强" />
<constructor-arg value="22" />
<constructor-arg ref="myXueXiao" />
</bean>

public class Id {
private int id;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
}

<bean id="xx" class="yyy.Id">
<property name="属性名字" value="此属性的值"/>
一个property只能给一个属性赋值
<property....>
</bean>

<bean id="xxx" class="yyy">
<property name="属性名称" ref="bean的id(对象的名称)" />
</bean>

public class student{
private string name;private int age;
private school school;
// setter
// toString()
}

<bean id="myStudent" class="com.bit.ba02.Student">
<!--引用类型的属性赋值–->
<property name="school" ref="mySchool" />〈!-- setSchool(mySchool) -->
</bean>