init Method in Spring

Calling Bean using init() method in Spring, this section describes  the way to initialize a bean through its lifecycle events using theinit() method .Here we have defined the property and values of  the bean using the init method as shown below:-

<bean id="mybean" class="Bean" init-method="init">:-Here "Bean" is the name of the bean class which would be referred in the xml file with the id "mybean".

init-method="init":-Specify the init method named "init" in the configuration file.

<property name="name"> <value>Roseindia.net</value>:-Here the <property> element is used to declare the attributes and to pass the desired value to the property element, the <value> element is used. Here the property name is "name"and its value is "Roseindia.net".

<bean id="mybean" class="Bean" init-method="init">     <property name="name">    <value>Roseindia.net</value>  </property>       <property name="address">        <value>Rohini</value>   </property>     <property name="type">   <value>Software Development Company</value>   </property>   </bean>

initMethod.xml

<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"  "http://www.springframework.org/dtd/spring-beans.dtd"> <beans>   <bean id="mybean" class="Bean" init-method="init">   <property name="name">   <value>Roseindia.net</value>   </property>   <property name="address">   <value>Rohini</value>   </property>   <property name="type">   <value>Software Development Company</value>   </property>  </bean> </beans>

Here is the file named SimpleBean.java through which we are retrieving the properties of the bean which we have defined in the above file i.e. initMethod.xml.

BeanFactory factory = new XmlBeanFactory(new FileSystemResource("initMethod.xml")):-Creates an instance of the XmlBeanFactory which is used to read bean definition from an XML document.

SimpleBean.java

import org.springframework.beans.factory.BeanCreationException;

import org.springframework.beans.factory.BeanFactory;

import org.springframework.beans.factory.xml.XmlBeanFactory;

import org.springframework.core.io.FileSystemResource;



public class Bean {



  private static final String DEFAULT_NAME = "Girish";

  private String name = null;

  private String address = null;

  private String type = null;

 



  public void setName(String name) {

  this.name = name;

  }

  public void setAddress(String address) {

  this.address = address;

  }



  public void setType(String type) {

  this.type = type;

  }



  public void init() {

  System.out.println("Initializing bean");



  if (name == null) {

  System.out.println("Using default name");

  name = DEFAULT_NAME;

  }

  if (address == null) {

  System.out.println("Using default name");

  address = DEFAULT_NAME;

  }

  if (type == null) {

  System.out.println("Using default name");

  type = DEFAULT_NAME;

  }



  }

  public String toString() {

  return "Name: " + name + "\nAddress: " + address + "\nType: " + type ;

  }



  public static void main(String[] args) {

  BeanFactory factory = new XmlBeanFactory(new FileSystemResource(

  "initMethod.xml"));



  Bean Bean1 = getBean("mybean", factory);

  }

  private static Bean getBean(String beanName, BeanFactory factory) {

  try {

  Bean bean = (Bean) factory.getBean(beanName);

  System.out.println(bean);

  return bean;

  } catch (BeanCreationException ex) {

  System.out.println("An error occured



in bean configuration: " + ex.getMessage());

  return null;

  }

  }

}  

Output of the program

Initializing bean Name: Roseindia.net Address: Rohini Type: Software Development Company