Spring Core

Using properties files in Spring

Using properties files by MessageSource in Spring: In previous chapters we will discuss about ApplicationContext and BeanFactory. ApplicationContext has some extra functionalities in Spring Framework which Internatiolization, Messaging, Properties file etc.

1. Using org.springframework.context.MessageSource:
Its using read message in the class files and display message as the output, below given example show how to use properties files with org.springframework.context.MessageSource.

myMessage.properties

greeting=Hello Dinesh!
drawing.circle=Circle is Drawn!

 

Now to read this properties file in the spring application we have to use the a class name “org.springframework.context.support.ResourceBundleMessageSource” this help to pick the properties files into to the application, this define as bean in the spring configuration file(spring.xml). As follows

spring.xml

<beans xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p" xmlns:>
 
Now "messageSource" using as property of the bean circle as follows:
Circle.java
package com.dineshonjava.sdnext.tutorial.property;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.MessageSource;
import org.springframework.stereotype.Component;

/**
 * @author Dinesh Rajput
 *
 */
@Component
public class Circle
{
 @Autowired
 private Point center;
 @Autowired
 private MessageSource messageSource;

 /**
  * @param messageSource the messageSource to set
  */
 public void setMessageSource(MessageSource messageSource) 
 {
  this.messageSource = messageSource;
 }

 /**
  * @param center the center to set
  */
 public void setCenter(Point center)
 {
  this.center = center;
 }

 public void draw()
 {
System.out.println(this.messageSource.getMessage("drawing.circle", null, "Default Drawing Greeting", null));
 }
}

 

In the above class file two property "center" and "messageSource" which autowired with the bean name "circle". We get the message of the properties file in the draw() method by using following method

 

org.springframework.context.MessageSource.getMessage(String arg0, Object[] arg1, String arg2, Locale arg3)

 

where String arg0 give the key of properties file to read its related message.
as our example we are using "drawing.circle" and "greeting" as keys.

 

Object[] arg1 is the array of parameters which are applied to the properties file.

Example.

drawing.point=Circle: Point is: ({0}, {1})
Here there are two parameters {0}, {1} passes as
getMessage("drawing.point", new Object[]{center.getX(), center.getY()}, "Default Drawing Greeting", null)
Here center.getX() is replace with the {0}
and center.getY() is replace with the {1}

Point.java

package com.dineshonjava.sdnext.tutorial.property;

/**
 * @author Dinesh Rajput
 *
 */
public class Point 
{
 private int x;
 private int y;
 /**
  * @return the x
  */
 public int getX() 
 {
  return x;
 }
 /**
  * @param x the x to set
  */
 public void setX(int x) 
 {
  this.x = x;
 }
 /**
  * @return the y
  */
 public int getY()
 {
  return y;
 }
 /**
  * @param y the y to set
  */
 public void setY(int y)
 {
  this.y = y;
 } 
}

 

Now run the following class file.

DrawingApp.java

package com.dineshonjava.sdnext.tutorial.property;

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

/**
 * @author Dinesh Rajput
 *
 */
public class DrawingApp
{

 /**
  * @param args
  */
 public static void main(String[] args)
 {
ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");
System.out.println(context.getMessage("greeting", null, "Default Greeting", null));
Circle circle = (Circle)context.getBean("circle");
shape.draw();
 }
}

 

If every thing ok then we get the following output:
Output:
Jul 18, 2012 9:04:33 PM org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@758fc9: startup date [Wed Jul 18 21:04:33 IST 2012]; root of context hierarchy
Jul 18, 2012 9:04:33 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [spring.xml]
Jul 18, 2012 9:04:34 PM org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@1238bd2: defining beans [org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,circle,center,messageSource,org.springframework.context.annotation.ConfigurationClassPostProcessor$ImportAwareBeanPostProcessor#0]; root of factory hierarchy

Hello Dinesh!
Circle is Drawn!


Using properties file with parameters:

myMessage.properties

greeting=Hello Dinesh!
drawing.circle=Circle is Drawn!
drawing.point=Circle: Point is: ({0}, {1})

 

Now make some change in the draw() method of Circle.java file.

 

public void draw()
{
System.out.println(this.messageSource.getMessage("drawing.circle", null, "Default Drawing Greeting", null));
System.out.println(this.messageSource.getMessage("drawing.point", new Object[]   {center.getX(), center.getY()}, "Default Drawing Greeting", null));
}

 

After make these change run the main application file then we get the following output:
Hello Dinesh!
Circle is Drawn!
Circle: Point is: (20, 0)




2. Using org.springframework.beans.factory.config.PropertyPlaceholderConfigurer:

If you need to read properties file in your Spring application all you need is to configure a PropertyPlaceholderConfigurer bean in your application context.
Following example shows how to read property values from a properties file named myMessage.properties. This file needs to be in your classpath so Spring can find it.

myMessage.properties

X-axis=20
Y-axis=0

spring.xml

<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer" id="placeholderConfig">    
<property name="location" value="classpath:myMessage.properties"> 
   
  </property>
</bean>  
<bean class="com.dineshonjava.sdnext.tutorial.property.Point" id="center">
 <property name="x" value="${X-axis}"></property>
 <property name="y" value="${Y-axis}"></property>
</bean>

 

Notice the placeholderConfig bean. This is where we are instructing Spring container to load the values from myMessage.properties file. You can name your will whatever you like.
Spring Related Topics you may like
  1. Spring Interview Questions and Answers
  2. Spring AOP Interview Questions and Answers
  3. Spring MVC Interview Questions
  4. Spring Security Interview Questions and Answers
  5. Spring REST Interview Questions and Answers
  6. Spring Boot Interview Questions and Answers
  7. Spring Boot Microservices Interview Questions and Answers
  8. Dependency Injection (DI) in Spring
  9. Spring IoC Container
  10. What is Bean Factory in Spring
  11. ApplicationContext in Spring
  12. Bean Autowiring in Spring
  13. Spring Bean Scopes
  14. Create Custom Bean Scope in Spring Example
  15. Using ApplicationContextAware in Spring
  16. Spring Bean Life Cycle and Callbacks
  17. BeanPostProcessor in Spring
  18. BeanFactoryPostProcessor in Spring
  19. Annotations in Spring and Based Configuration
  20. Spring JSR-250 Annotations
  21. JSR 330 Annotations in Spring
  22. Spring @Component, @Repository, @Service and @Controller Stereotype Annotations
  23. Method injection with Spring using Lookup method property
  24. Spring AOP-Introduction to Aspect Oriented Programming
  25. @Aspect Annotation in Spring
  26. Spring AOP AspectJ @Before Annotation Advice Example
  27. Spring AOP Before Advice Example using XML Config
  28. Spring AOP AspectJ @After Annotation Advice Example
  29. Spring AOP After Advice Example using XML Config
  30. Spring AOP AspectJ @AfterReturning Annotation Advice Example
  31. Spring AOP After-Returning Advice Example using XML Config
  32. Spring AOP AspectJ @AfterThrowing Annotation Advice Example
  33. Spring AOP After Throwing Advice Example using XML Config
  34. Spring AOP AspectJ @Around Annotation Advice Example
  35. Spring AOP Around Advice Example using XML Config
  36. Spring AOP Proxies in Spring
  37. Spring AOP Transaction Management in Hibernate
  38. Spring Transaction Management
  39. Spring Declarative Transaction Management Example
  40. Spring AOP-Ordering of Aspects with Example
  41. Spring Security Java Based Configuration with Example
  42. Spring Security XML Namespace Configuration Example

 

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Dinesh Rajput

Dinesh Rajput is the chief editor of a website Dineshonjava, a technical blog dedicated to the Spring and Java technologies. It has a series of articles related to Java technologies. Dinesh has been a Spring enthusiast since 2008 and is a Pivotal Certified Spring Professional, an author of a book Spring 5 Design Pattern, and a blogger. He has more than 10 years of experience with different aspects of Spring and Java design and development. His core expertise lies in the latest version of Spring Framework, Spring Boot, Spring Security, creating REST APIs, Microservice Architecture, Reactive Pattern, Spring AOP, Design Patterns, Struts, Hibernate, Web Services, Spring Batch, Cassandra, MongoDB, and Web Application Design and Architecture. He is currently working as a technology manager at a leading product and web development company. He worked as a developer and tech lead at the Bennett, Coleman & Co. Ltd and was the first developer in his previous company, Paytm. Dinesh is passionate about the latest Java technologies and loves to write technical blogs related to it. He is a very active member of the Java and Spring community on different forums. When it comes to the Spring Framework and Java, Dinesh tops the list!

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