Spring — java.util.Properties DI Parameters | Code Factory

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• For Property, inside dtd based configuration we can pass required key-value pairs.

<bean id="" class="">
	<property name="">
		<props>
			<prop key="fname">ABC</prop>
		</props>
	<property>
</bean>

• For Map we use <entry> tag but for Property we use <props> tag.

Create Java Project

• Open Eclipse
• Go to File -> New -> Others… -> Java Project
• Create DI-Properties project
• Right click on project -> Build Path -> Configure Build Path -> Libraries tab -> Add External JARs
  - commons-logging-X.X.jar
  - spring-beans-X.X.X.jar
  - spring-context-X.X.X.jar
  - spring-core-X.X.X.jar
  - spring-expression-X.X.X.jar
• * You can find dtd information from spring-beans-X.X.X.jar -> org -> springframework -> beans -> factory -> xml -> spring-beans.dtd (line no 36 & 37)

spring.xml

<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN"
	"http://www.springframework.org/dtd/spring-beans-2.0.dtd">
<beans>
	<bean id="t" class="com.codeFactory.beans.Test">
		<property name="driver">
			<props>
				<prop key="driverClass">com.mysql.jdbc.Driver</prop>
				<prop key="url">jdbc:mysql://localhost:3306/test</prop>
				<prop key="user">username</prop>
				<prop key="password">password</prop>
			</props>
		</property>
	</bean>
</beans>

Test.java

package com.codeFactory.beans;
import java.util.Map.Entry;
import java.util.Properties;
/**
 * @author code.factory
 *
 */
public class Test {
	private Properties driver;
	public void setDriver(Properties driver) {
		this.driver = driver;
	}
	public void print() {
		System.out.println("Driver Info: " + driver);
		for(Entry<Object, Object> obj : driver.entrySet()) {
			System.out.println(obj.getKey() + " : " + obj.getValue());
		}
	}
}

Client.java

package com.codeFactory.test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.codeFactory.beans.Test;
/**
 * @author code.factory
 *
 */
public class Client {
	public static void main(String... args) {
		ApplicationContext context = new ClassPathXmlApplicationContext("com/codeFactory/resources/spring.xml");
		
		Test t = (Test) context.getBean("t");
		t.print();
	}
}

Output:

Driver Info: {driverClass=com.mysql.jdbc.Driver, user=username, password=password, url=jdbc:mysql://localhost:3306/test}
driverClass : com.mysql.jdbc.Driver
user : username
password : password
url : jdbc:mysql://localhost:3306/test