setter注入:
<bean id="exampleBean" class="examples.ExampleBean">

<!-- setter injection using the nested <ref/> element -->
<property name="beanOne"><ref bean="anotherExampleBean"/></property>

<!-- setter injection using the neater 'ref' attribute -->
<property name="beanTwo" ref="yetAnotherBean"/>
<property name="integerProperty" value="1"/>
</bean>

<bean id="anotherExampleBean" class="examples.AnotherBean"/>
<bean id="yetAnotherBean" class="examples.YetAnotherBean"/>
public class ExampleBean {

private AnotherBean beanOne;
private YetAnotherBean beanTwo;
private int i;

public void setBeanOne(AnotherBean beanOne) {
this.beanOne = beanOne;
}

public void setBeanTwo(YetAnotherBean beanTwo) {
this.beanTwo = beanTwo;
}

public void setIntegerProperty(int i) {
this.i = i;
}
}
构造器注入:
<bean id="exampleBean" class="examples.ExampleBean">
<!-- constructor injection using the nested <ref/> element -->
<constructor-arg><ref bean="anotherExampleBean"/></constructor-arg>

<!-- constructor injection using the neater 'ref' attribute -->
<constructor-arg ref="yetAnotherBean"/>

<constructor-arg type="int" value="1"/>
</bean>
<bean id="anotherExampleBean" class="examples.AnotherBean"/>
<bean id="yetAnotherBean" class="examples.YetAnotherBean"/>
public class ExampleBean {
private AnotherBean beanOne;
private YetAnotherBean beanTwo;
private int i;

public ExampleBean(
AnotherBean anotherBean, YetAnotherBean yetAnotherBean, int i) {
this.beanOne = anotherBean;
this.beanTwo = yetAnotherBean;
this.i = i;
}
}
静态工厂方法实现构造:
<bean id="exampleBean" class="examples.ExampleBean"
factory-method="createInstance">
<constructor-arg ref="anotherExampleBean"/>
<constructor-arg ref="yetAnotherBean"/>
<constructor-arg value="1"/>
</bean>

<bean id="anotherExampleBean" class="examples.AnotherBean"/>
<bean id="yetAnotherBean" class="examples.YetAnotherBean"/>
public class ExampleBean {
// a private constructor
private ExampleBean(...) {
...
}

// a static factory method; the arguments to this method can be
// considered the dependencies of the bean that is returned,
// regardless of how those arguments are actually used.
public static ExampleBean createInstance (
AnotherBean anotherBean, YetAnotherBean yetAnotherBean, int i) {
ExampleBean eb = new ExampleBean (...);
// some other operations
...
return eb;
}
}
        注意:传给静态工厂方法的参数由constructor-arg元素提供,这与使用构造器注入时完全一样。而且,重要的是,工厂方法所返回的实例的类型并不一定要与包含static工厂方法的类类型一致。