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 the init() 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"
|
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 |