Spring由構造方法自動裝配

1. Beans

這裡有兩個 beans, 分別是：developer 和 language

package com.tw511.common;

public class Developer {
	private Language language;

	//autowire by constructor
	public Developer(Language language) {
		this.language = language;
	}

	//...

}

package com.tw511.common;

public class Language {
	private String name;
	//...
}

2. Spring裝配

<bean id="developer" class="com.tw511.common.Developer">
		<constructor-arg>
			<ref bean="language" />
		</constructor-arg>
	</bean>
		
	<bean id="language" class="com.tw511.common.Language" >
		<property name="name" value="Java" />
	</bean>

輸出

Developer [language=Language [name=Java]]

<bean id="developer" class="com.tw511.common.Developer" autowire="constructor" />
		
	<bean id="language" class="com.tw511.common.Language" >
		<property name="name" value="Java" />
	</bean>

輸出

Developer [language=Language [name=Java]]