Message Digest Example : IoC Factory Beans « Spring « Java

1. Java
2. Spring
3. IoC Factory Beans

Message Digest Example

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



///////////////////////////////////////////////////////////////////////////////////////
//File: factory.xml
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
    <bean id="shaDigest" class="MessageDigestFactoryBean">
        <property name="algorithmName">
            <value>SHA1</value>
        </property>
    </bean>
    <bean id="defaultDigest" class="MessageDigestFactoryBean"/>
    <bean id="digester" class="MessageDigester">
        <property name="digest1">
            <ref local="shaDigest"/>
        </property>
        <property name="digest2">
            <ref local="defaultDigest"/>
        </property>
    </bean>
</beans>



///////////////////////////////////////////////////////////////////////////////////////
import java.security.MessageDigest;

import sun.misc.BASE64Encoder;

public class MessageDigester {

    private MessageDigest digest1 = null;
    private MessageDigest digest2 = null;
    
    public void setDigest1(MessageDigest digest1) {
        this.digest1 = digest1;
    }
    
    public void setDigest2(MessageDigest digest2) {
        this.digest2 = digest2;
    }
    
    public void digest(String msg) {
        System.out.println("Using digest1");
        digest(msg, digest1);

        System.out.println("Using digest2");
        digest(msg, digest2);
    }
    
    private void digest(String msg, MessageDigest digest) {
        System.out.println("Using alogrithm: " + digest.getAlgorithm());
        digest.reset();
        byte[] bytes = msg.getBytes();
        byte[] out = digest.digest(bytes);
        BASE64Encoder enc = new BASE64Encoder();
        System.out.println(enc.encode(out));
    }
}



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


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

public class MessageDigestExample {

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

        MessageDigester digester = (MessageDigester) factory
                .getBean("digester");
        digester.digest("Hello World!");

    }
}

           
       

MessageDigestExample.zip( 1,199 k)

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