Spring Autowiring by Constructor
In Spring, “Autowiring by Constructor” is actually autowiring by Type in constructor argument. It means, if data type of a bean is same as the data type of other bean constructor argument, auto wire it.
See a full example of Spring auto wiring by constructor.
1. Beans
Two beans, developer
and language
.
package com.mkyong.common;
public class Developer {
private Language language;
//autowire by constructor
public Developer(Language language) {
this.language = language;
}
//...
}
package com.mkyong.common;
public class Language {
private String name;
//...
}
2. Spring Wiring
Normally, you wire the bean via constructor like this :
<bean id="developer" class="com.mkyong.common.Developer">
<constructor-arg>
<ref bean="language" />
</constructor-arg>
</bean>
<bean id="language" class="com.mkyong.common.Language" >
<property name="name" value="Java" />
</bean>
Output
Developer [language=Language [name=Java]]
With autowire by constructor enabled, you can leave the constructor
property unset. Spring will find the compatible data type and wire it automatcailly.
<bean id="developer" class="com.mkyong.common.Developer" autowire="constructor" />
<bean id="language" class="com.mkyong.common.Language" >
<property name="name" value="Java" />
</bean>
Output
Developer [language=Language [name=Java]]
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