Spring: PropertyPlaceholderConfigurer: Load multiple property files

In my previous post, I explained how to load a property file using PropertyPlaceholderConfigurer. In real world scenario, an application requires to maintain multiple property files. By using PropertyPlaceholderConfigurer class, you can load multiple property files.

Following statement loads the property files mail.properties, db.properties.

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

  <property name="locations">
   <list>
    <value>classpath:mail.properties</value>
    <value>classpath:db.properties</value>
   </list>
  </property>

 </bean>

Following is the complete working application.

mail.properties

app.contactUs=krishna@krishna.com
app.reportTo=help@krishna.com

db.properties

db.hostName=abc.xyz.com
db.port=8081
db.userName=krish@gmail.com
db.password=secret

Database.java

package com.sample.pojo;

public class Database {
 private String hostName;
 private String port;
 private String userName;
 private String password;

 public String getHostName() {
  return hostName;
 }

 public void setHostName(String hostName) {
  this.hostName = hostName;
 }

 public String getPort() {
  return port;
 }

 public void setPort(String port) {
  this.port = port;
 }

 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;
 }

 @Override
 public String toString() {
  StringBuilder builder = new StringBuilder();
  builder.append("Database [hostName=").append(hostName).append(", port=").append(port).append(", userName=")
    .append(userName).append(", password=").append(password).append("]");
  return builder.toString();
 }

}

Application.java

package com.sample.pojo;

public class Application {
 private String contactUs;
 private String mailTo;

 public String getContactUs() {
  return contactUs;
 }

 public void setContactUs(String contactUs) {
  this.contactUs = contactUs;
 }

 public String getMailTo() {
  return mailTo;
 }

 public void setMailTo(String mailTo) {
  this.mailTo = mailTo;
 }

 @Override
 public String toString() {
  StringBuilder builder = new StringBuilder();
  builder.append("Application [contactUs=").append(contactUs).append(", mailTo=").append(mailTo).append("]");
  return builder.toString();
 }

}

myConfiguration.xml

<?xml version="1.0" encoding="UTF-8"?>
<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.xsd">

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

  <property name="locations">
   <list>
    <value>classpath:mail.properties</value>
    <value>classpath:db.properties</value>
   </list>
  </property>

 </bean>

 <bean id="database" name="database" class=" com.sample.pojo.Database">
  <property name="hostName" value="${db.hostName}" />
  <property name="port" value="${db.port}" />
  <property name="userName" value="${db.userName}" />
  <property name="password" value="${db.password}" />
 </bean>
 
 <bean id="application" name="application" class=" com.sample.pojo.Application">
  <property name="contactUs" value="${app.contactUs}" />
  <property name="mailTo" value="${app.reportTo}" />
 </bean>

</beans>

HelloWorld.java

package com.sample.test;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.sample.pojo.Application;
import com.sample.pojo.Database;

public class HelloWorld {
 public static void main(String args[]) {
  ApplicationContext context = new ClassPathXmlApplicationContext(new String[] { "myConfiguration.xml" });

  Database database = context.getBean("database", Database.class);
  Application application = context.getBean("application", Application.class);

  System.out.println(database);
  System.out.println(application);

  ((ClassPathXmlApplicationContext) context).close();
 }
}

Run HelloWorld.java, you can able to see following output.

Database [hostName=abc.xyz.com, port=8081, userName=krish@gmail.com, password=secret]

Application [contactUs=krishna@krishna.com, mailTo=help@krishna.com]

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