Spring Constructor Injection
In this example you will see Basic Constructor Injection
In this example you will see Basic Constructor Injection
Basic Constructor Injection
In this example you will see how the Spring beans XML file used to configure
your bean to initialize with an argument for the constructor, and then assign
the argument. This all process can also be said as injecting the argument into
your bean and widely known as constructor injection.
ConstructorInjection.java
package net.roseindia;
public class ConstructorInjection {
private String message = null;
public ConstructorInjection(String message) {
this.message = message;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
}
|
ConstructorInjectionTest.java
package net.roseindia;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class ConstructorInjectionTest {
public static void main(String[] args) {
BeanFactory beanfactory = new ClassPathXmlApplicationContext(
"context.xml");
ConstructorInjection bean = (ConstructorInjection) beanfactory
.getBean("basic");
System.out.println(bean.getMessage());
}
}
|
context.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
<bean id="basic" class="net.roseindia.ConstructorInjection">
<constructor-arg value="Hello Spring" />
</bean>
</beans>
|
When you run this application it display output as shown below:
Hello Spring
Download this example code
