Table of Contents
Spring autowiring byName means autowiring on the basis of name. If any bean property matches with exact one other bean’s name declaration then spring will automatically takes care of dependency.
Below diagram will make it clear:
For example:
I am taking example of autowire “byName” here.It will be almost same as Dependency injection via setter method with some changes in XML configuration file.
1.Country.java:
This is simple pojo class having some attributes so here country has name and object of Capital class.
Create Country.java under package org.arpit.java2blog.Copy following content into Country.java.
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package org.arpit.java2blog; public class Country { String countryName; Capital capitalObj; public String getCountryName() { return countryName; } public void setCountryName(String countryName) { this.countryName = countryName; } public Capital getCapitalObj() { return capitalObj; } public void setCapitalObj(Capital capitalObj) { this.capitalObj = capitalObj; } } |
2.Capital.java
This is also simple pojo class having one attribute called “capitalName”.
Create Capital.java under package org.arpit.java2blog.java.Above Country class contains object of this class.Copy following content into Capital.java
Here in ,we have used autowire attribute and set it to “byName”.So now spring container will match “capitalObj” reference in Country class with id or name of other beans in XML configuration file. So here you can see we have bean with id as “capitalObj”
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package org.arpit.java2blog; public class Capital { String capitalName; public String getCapitalName() { return capitalName; } public void setCapitalName(String capitalName) { this.capitalName = capitalName; } } |
3.BeanAutowiringByTypeMain.java
This class contains main function.Create BeanAutowiringByNameMain.java under package org.arpit.java2blog.Copy following content into BeanAutowiringByNameMain.java
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package org.arpit.javapostsforlearning; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class BeanAutowiringByNameMain{ public static void main(String[] args) { ApplicationContext appContext = new ClassPathXmlApplicationContext("ApplicationContext.xml"); Country countryObj = (Country) appContext.getBean("country"); String countryName=countryObj.getCountryName(); String capitalName=countryObj.getCapitalObj().getCapitalName(); System.out.println(capitalName+" is capital of "+countryName); } } |
You can note here that we have used ClassPathXmlApplicationContext for getting bean here.There are various ways for getting beans.In hello world example we have used XmlBeanFactory for getting beans.
4.ApplicationContext.xml
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<?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="country" class="org.arpit.java2blog.Country" autowire="byName"> <property name="countryName" value="India"/> </bean> <bean id="capital" class="org.arpit.java2blog.Capital"> <property name="capitalName" value="Delhi" /> </bean> </beans> |
5.Run it
When you will run above application,you will get following as output.
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Delhi is capital of India |
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