Factory Bean Demo : XML Bean « Spring « Java Tutorial

1. Java Tutorial
2. Spring
3. XML Bean

File: context.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="
                http://www.springframework.org/schema/beans
                http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="sha" class="MessageDigestFactoryBean">
        <property name="algorithm" value="SHA1"/>
    </bean>

    <bean id="md5" class="MessageDigestFactoryBean"/>
    
</beans>

File: Main.java

import java.security.MessageDigest;

import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;

public class Main {
  public static void main(String[] args) {
    XmlBeanFactory factory = new XmlBeanFactory(new ClassPathResource("context.xml"));
    String d1 = (String) factory.getBean("sha");
    String d2 = (String) factory.getBean("md5");
    System.out.println(d1);
    System.out.println(d2);
  }

}

class MessageDigestFactoryBean implements FactoryBean, InitializingBean {
  private static final String DEFAULT_ALGORITHM = "MD5";

  private String algorithm = DEFAULT_ALGORITHM;

  public Object getObject() throws Exception {
    return this.algorithm;
  }

  public Class getObjectType() {
    return MessageDigest.class;
  }

  public boolean isSingleton() {
    return true;
  }

  public void setAlgorithm(String algorithm) {
    this.algorithm = algorithm;
  }

  public void afterPropertiesSet() throws Exception {
    this.algorithm += " after setting";
  }
}

28.4.XML Bean
	28.4.1.	XML Bean Injection with namespace
	28.4.2.	BeanName Aware
	28.4.3.	XML Based Bean Configuration
	28.4.4.	Required Property Not Set Exception
	28.4.5.	Method Loopup
	28.4.6.	Local Reference
	28.4.7.	Inheritance Demo
	28.4.8.	Get Method By Name
	28.4.9.	Factory Object Integration
	28.4.10.	Spring factory method
	28.4.11.	Factory Bean Demo
	28.4.12.	Autowiring
	28.4.13.	Annotation Component
	28.4.14.	Annotated Autowiring
	28.4.15.	Alias Bean Demo
	28.4.16.	After Returning Advice Demo