How to load Environment specific properties using Spring PropertyPlaceholderConfigurer

This post will explain how to load environment specific[DEV,SIT,UAT,PROD] properties from the single properties file

Step 1: Create simple java project using eclipse
Step 2: Create a abstract class , with under package - com.javaguru.property, i have created with name - PropertyClient.java

package com.javaguru.property;

public abstract class PropertyClient {

 
 protected String hostName;
 protected String userId;
 protected String password;
 
 
 
 public PropertyClient(String hostName, String userId, String password) {
  super();
  this.hostName = hostName;
  this.userId = userId;
  this.password = password;
  
 }
 
 public PropertyClient(){
  
 }
 
 public String getHostName() {
  return hostName;
 }
 public void setHostName(String hostName) {
  this.hostName = hostName;
 }
 public String getUserId() {
  return userId;
 }
 public void setUserId(String userId) {
  this.userId = userId;
 }
 public String getPassword() {
  return password;
 }
 public void setPassword(String password) {
  this.password = password;
 }
 
 //common methods related to functionality
}
   

Step 3: Create implementation class.

package com.javaguru.property;

public class PropertyClientImpl extends PropertyClient{

 
 public PropertyClientImpl(String hostName, String userId, String password) {
  super(hostName, userId, password);
 }
 public PropertyClientImpl(){
  super();
 }
 //Implementation of abstract methods
}

Step 4: Create property file name called - application.properties under src folder

[DEV]
ftp.dev.hostname=dev.com
ftp.dev.username=user
ftp.dev.password=pass

[SIT]
ftp.sit.hostname=sit.net
ftp.sit.username=user
ftp.sit.password=pass

[UAT]
ftp.uat.hostname=uat.net
ftp.uat.username=user
ftp.uat.password=pass

[PROD]
ftp.prod.hostname=prod.net
ftp.prod.username=user
ftp.prod.password=pass

Step 5: Create applicationContext.xml under src- folder

 

 
   
  application.properties
  
 


    
    
    

Step 6: Create Test class with name - TestEnvSpecificProperty.java- or call the code which ever place you need to load the properties

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

import com.javaguru.property.PropertyClient;
import com.javaguru.property.PropertyClientImpl;
/**
 * 
 * @author siva
 *
 */
public class TestEnvSpecificProperty {

 public static void main(String[] args) {
  //Set which environment properties we need to load.
  System.setProperty("env","dev");
  //load the applicationContext.xml file
  ApplicationContext context =  new ClassPathXmlApplicationContext("applicationContext.xml");
  PropertyClient propertyClient= (PropertyClientImpl)context.getBean("propertyClient");
  //print property details
   System.out.println("Host Name: ["+propertyClient.getHostName()+"]");
   System.out.println("User ID: ["+propertyClient.getUserId()+"]");
   System.out.println("Password: ["+propertyClient.getPassword()+"]");
  
 }
}

Step 7: Output would be like below, if you mention System property as dev

Host Name: [dev.com]
User ID: [user]
Password: [pass]

Step 8: Required jars

commons-codec-1.3.jar
commons-collections-3.2.jar
commons-logging-1.1.1.jar
commons-net-3.3.jar
spring-asm-3.0.5.RELEASE.jar
spring-beans-3.0.4.RELEASE.jar
spring-context-3.0.5.RELEASE.jar
spring-core-3.0.4.RELEASE.jar
spring-expression-3.2.1.release.jar