Setter Injection in Spring IOC

Setter Injection

This article presents how to write the Setter Injection in Spring IOC. There are two types of Dependency Injection(DI) techniques we can use. 1) Setter Injection and 2) Constructor Injection.

also read:

As the name implies, using setter methods in a bean class the Spring IOC container will inject the dependencies. This technique is considered as the best approach for Dependency Injection. In this type of injection we have chance to reconfigure the bean instance as needed basis.

Employee.java

<code>
package javabeat.net.spring.ioc;

/**
 * Source : http://www.javabeat.net
 */

public class Employee {
    private String name;
    private String empId;
    private Address address;
    public Employee(){
    }

    public Address getAddress() {
        return address;
    }

    public void setAddress(Address address) {
        this.address = address;
    }

    public String getEmpId() {
        return empId;
    }

    public void setEmpId(String empId) {
        this.empId = empId;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

Address.java

package javabeat.net.spring.ioc;
/**
 * Source : http://www.javabeat.net
 */

public class Address {
    public Address(){

    }
    private String street;
    private String city;
    private String pincode;

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    public String getPincode() {
        return pincode;
    }

    public void setPincode(String pincode) {
        this.pincode = pincode;
    }

    public String getStreet() {
        return street;
    }

    public void setStreet(String street) {
        this.street = street;
    }

}

ConstructorInjection.java

package javabeat.net.spring.ioc;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.FileSystemResource;
import org.springframework.core.io.Resource;

/**
 * source : www.javabeat.net
 */
public class ConstructorInjection {
    public static void main(String args[]){
        Resource xmlResource = new FileSystemResource("applicationContext.xml");
        BeanFactory factory = new XmlBeanFactory(xmlResource);
        Employee employee = (Employee)factory.getBean("employeeBean");
        Address address = employee.getAddress();
        System.out.println(employee.getName());
        System.out.println(employee.getEmpId());
        System.out.println(address.getCity());
        System.out.println(address.getStreet());
        System.out.println(address.getPincode());
    }
}

applicationContext.xml

also read:

<?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:p="http://www.springframework.org/schema/p"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
       http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
       http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">
    <bean id="addressBean" class="javabeat.net.spring.ioc.Address">
        <property name="street">
            <value>Street</value>
        </property>
        <property name="city">
            <value>Bangalore</value>
        </property>
        <property name="pincode">
            <value>567456</value>
        </property>
    </bean>
    <bean id="employeeBean" class="javabeat.net.spring.ioc.Employee">
        <property name="name" value="MyName"/>
        <property name="empId"  value="001"/>
        <property name="address" ref="addressBean"/>
    </bean>
</beans>

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About Krishna Srinivasan

He is Founder and Chief Editor of JavaBeat. He has more than 8+ years of experience on developing Web applications. He writes about Spring, DOJO, JSF, Hibernate and many other emerging technologies in this blog.

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