Spring Setter Injection

by Online Tutorials Library July 14, 2022

Dependency Injection by setter method

We can inject the dependency by setter method also. The <property> subelement of <bean> is used for setter injection. Here we are going to inject

primitive and String-based values
Dependent object (contained object)
Collection values etc.

Injecting primitive and string-based values by setter method

Let’s see the simple example to inject primitive and string-based values by setter method. We have created three files here:

Employee.java
applicationContext.xml
Test.java

Employee.java

It is a simple class containing three fields id, name and city with its setters and getters and a method to display these informations.

 package com.tutoraspire;  public class Employee { private int id; private String name; private String city;  public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; }  public String getCity() { return city; } public void setCity(String city) { this.city = city; } void display(){ System.out.println(id+” “+name+” “+city); }  }  

applicationContext.xml

We are providing the information into the bean by this file. The property element invokes the setter method. The value subelement of property will assign the specified value.

 <?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” xsi:schemaLocation=”http://www.springframework.org/schema/beans                 http://www.springframework.org/schema/beans/spring-beans-3.0.xsd”>  <bean id=”obj” class=”com.tutoraspire.Employee”> <property name=”id”> <value>20</value> </property> <property name=”name”> <value>Arun</value> </property> <property name=”city”> <value>ghaziabad</value> </property>  </bean>  </beans> 

Test.java

This class gets the bean from the applicationContext.xml file and calls the display method.

 package com.tutoraspire;  import org.springframework.beans.factory.BeanFactory; import org.springframework.beans.factory.xml.XmlBeanFactory; import org.springframework.core.io.*;  public class Test { public static void main(String[] args) {  Resource r=new ClassPathResource(“applicationContext.xml”); BeanFactory factory=new XmlBeanFactory(r);  Employee e=(Employee)factory.getBean(“obj”); s.display();  } } 

Output:20 Arun ghaziabad

download this example (developed using MyEclipse IDE)
download this example (developed using Eclipse IDE)

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