Accessing Factory Beans : IoC Factory Beans « Spring « Java

1. Java
2. Spring
3. IoC Factory Beans

Accessing Factory Beans

/*
Pro Spring
By Rob Harrop
Jan Machacek
ISBN: 1-59059-461-4
Publisher: Apress
*/

//spring.xml
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
    <bean id="messageDigest" class="MessageDigestFactoryBean">
        <property name="algorithmName">
            <value>SHA1</value>
        </property>
    </bean>
</beans>

//////////////////////////////////////////////////////////////////////////////


import java.security.MessageDigest;

import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.InitializingBean;

public class MessageDigestFactoryBean implements FactoryBean, InitializingBean {

    private String algorithmName = "MD5";
    
    private MessageDigest messageDigest = null;

    public Object getObject() throws Exception {
       return messageDigest;
    }


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


    public boolean isSingleton() {
       return true;
    }

    public void afterPropertiesSet() throws Exception {
        messageDigest = MessageDigest.getInstance(algorithmName);
    }
    
    public void setAlgorithmName(String algorithmName) {
        this.algorithmName = algorithmName;
    }

}



//////////////////////////////////////////////////////////////////////////////



import java.security.MessageDigest;

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

public class AccessingFactoryBeans {

    public static void main(String[] args) {
        BeanFactory factory = new XmlBeanFactory(new FileSystemResource(
                "build/spring.xml"));

        MessageDigest digest = (MessageDigest) factory
                .getBean("messageDigest");
       
        
        MessageDigestFactoryBean factoryBean = (MessageDigestFactoryBean) factory
                .getBean("&messageDigest");
    }
}


           
       

AccessingFactoryBeans.zip( 1,197 k)

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