Spring Externalizing Configuration Properties

DSBean.java:

package com.lnn.props;

public class DSBean {

      private String url = null;

      private String driver = null;

      private String username = null;

      private String password = null;

      public String getUrl() {

            return url;

      }

      public void setUrl(String url) {

            this.url = url;

      }

      public String getDriver() {

            return driver;

      }

      public void setDriver(String driver) {

            this.driver = driver;

      }

      public String getUsername() {

            return username;

      }

      public void setUsername(String username) {

            this.username = username;

      }

      public String getPassword() {

            return password;

      }

      public void setPassword(String password) {

            this.password = password;

      }

}

database.properties:

database.url=jdbc:hsqldb:Training

database.driver=org.hsqldb.jdbcDriver

database.username=appUser

database.password=password

props.xml:

<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-3.0.xsd">

      <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">

            <property name="location" value="database.properties" />

      </bean>

      <bean id="dsBean" class="com.lnn.props.DSBean">

            <property name="url" value="${database.url}"/>

            <property name="driver" value="${database.driver}"/>

            <property name="username" value="${database.username}"/>

            <property name="password" value="${database.password}"/>

      </bean>

</beans>

Test.java:

package com.lnn.props;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Test {

      public static void main(String[] args) {

            ApplicationContext context = new ClassPathXmlApplicationContext("props.xml");

            DSBean bean = context.getBean("dsBean", DSBean.class);

            System.out.println(bean.getDriver());

            System.out.println(bean.getUrl());

            System.out.println(bean.getUsername());

            System.out.println(bean.getPassword());

      }

}