Java/Spring/IoC Resource

File System Resource Demo

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

///////////////////////////////////////////////////////////////////////////////////////
//File: beans.xml
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
    <bean id="oracle" name="wiseworm" class="BookwormOracle"/>
</beans>

///////////////////////////////////////////////////////////////////////////////////////
public interface Oracle {
    public String defineMeaningOfLife();
}

///////////////////////////////////////////////////////////////////////////////////////
public class Encyclopedia {
}
///////////////////////////////////////////////////////////////////////////////////////
public class BookwormOracle implements Oracle {
    private Encyclopedia enc;
    public void setEncyclopedia(Encyclopedia enc) {
        this.enc = enc;
    }
    public String defineMeaningOfLife() {
        return "Encyclopedia"s are a waste of money - use the Internet";
    }
}
///////////////////////////////////////////////////////////////////////////////////////
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;
import org.springframework.core.io.FileSystemResource;
public class XmlConfig {
    public static void main(String[] args) {
        DefaultListableBeanFactory factory = new DefaultListableBeanFactory();
        XmlBeanDefinitionReader rdr = new XmlBeanDefinitionReader(factory);
        rdr.loadBeanDefinitions(new FileSystemResource("build/beans.xml"));
        Oracle oracle = (Oracle)factory.getBean("oracle");
    }
}

Message Source

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

///////////////////////////////////////////////////////////////////////////////////////
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
    <bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">
            <property name="basenames">
                <list>
                    <value>buttons</value>
                    <value>labels</value>
                </list>    
            </property>
    </bean>
</beans>

///////////////////////////////////////////////////////////////////////////////////////
import java.util.Locale;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;
public class MessageSourceDemo {
    public static void main(String[] args) {
        ApplicationContext ctx = new FileSystemXmlApplicationContext(
                "build/messageSource.xml");
        Locale english = Locale.ENGLISH;
        Locale czech = new Locale("cs", "CZ");
        System.out.println(ctx.getMessage("msg", null, english));
        System.out.println(ctx.getMessage("msg", null, czech));
        
        System.out.println(ctx.getMessage("nameMsg", new Object[] { "Rob",
                "Harrop" }, english));
    }
}

Spring Load Resource from file, classpath and URL

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

///////////////////////////////////////////////////////////////////////////////////////
//File: events.xml
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
    <bean id="publisher" class="Publisher"/>
        <bean id="messageEventListener" class="MessageEventListener"/>
</beans>
///////////////////////////////////////////////////////////////////////////////////////
import org.springframework.context.ApplicationEvent;

public class MessageEvent extends ApplicationEvent {
    private String msg;
    public MessageEvent(Object source, String msg) {
        super(source);
        this.msg = msg;
    }
    
    public String getMessage() {
        return msg;
    }
    
}
///////////////////////////////////////////////////////////////////////////////////////
import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;
public class MessageEventListener implements ApplicationListener {
   
    public void onApplicationEvent(ApplicationEvent event) {
       if(event instanceof MessageEvent) {
           MessageEvent msgEvt = (MessageEvent)event;
           System.out.println("Received: " + msgEvt.getMessage());
       }
    }
}
///////////////////////////////////////////////////////////////////////////////////////
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.support.FileSystemXmlApplicationContext;
public class Publisher implements ApplicationContextAware {
    private ApplicationContext ctx;
    public static void main(String[] args) {
        ApplicationContext ctx = new FileSystemXmlApplicationContext(
                "build/events.xml");
        Publisher pub = (Publisher) ctx.getBean("publisher");
        pub.publish("Hello World!");
        pub.publish("The quick brown fox jumped over the lazy dog");
    }
    public void setApplicationContext(ApplicationContext applicationContext)
            throws BeansException {
        this.ctx = applicationContext;
    }
    public void publish(String message) {
        ctx.publishEvent(new MessageEvent(this, message));
    }
}
///////////////////////////////////////////////////////////////////////////////////////
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;
import org.springframework.core.io.Resource;
public class ResourceDemo {
    public static void main(String[] args) throws Exception{
        ApplicationContext ctx = new FileSystemXmlApplicationContext(
        "build/events.xml");
  
        Resource res1 = ctx.getResource("file:///c:/test.txt");
        displayInfo(res1);
        Resource res2 = ctx.getResource("classpath:lib/commons-logging.jar");
        displayInfo(res2);
        Resource res3 = ctx.getResource("http://www.google.co.uk");
        displayInfo(res3);
    }
    
    private static void displayInfo(Resource res) throws Exception{
        System.out.println(res.getClass());
        System.out.println(res.getURL().getContent());
        System.out.println("");
    }
}