Spring Constructor Injection

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Spring Constructor Injection
Posted on: August 2, 2010 at 12:00 AM

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

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