how to read a properties file in a web application

7/31/2019 How to Read a Properties File in a Web Application

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How to read a properties file in a web application

The code to do this is pretty simple. But going by the number of people who keep asking thisquestion, i thought i would post the code over here. Let's consider that you have a war file named

SampleApp.war which has a properties file named myApp.properties at it's root :

SampleApp.war

|

|-------- myApp.properties

|

|-------- WEB-INF

|

|---- classes

|

|----- org

|------ myApp

|------- MyPropertiesReader.class

Let's assume that you want to read the property named "abc" present in the properties file:

----------------

myApp.properties:

----------------

abc=some value

xyz=some other value

Let's consider that the class org.myApp.MyPropertiesReader present in your application wants to

read the property. Here's the code for the same:

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1. package org.myapp;2.3. import java.io.IOException;4. import java.io.InputStream;5. import java.util.Properties;6.7. /**8. * Simple class meant to read a properties file9. *10. * @author Jaikiran Pai11. *
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12. */13.public class MyPropertiesReader {14.15. /**16. * Default Constructor17.

*18. */

19. public MyPropertiesReader() {20.21. }22.23. /**24. * Some Method25. *26. * @throws IOException27. *28.

*/29. public void doSomeOperation() throws IOException {

30. // Get the inputStream31. InputStream inputStream = this.getClass().getClassLoader()32. .getResourceAsStream("myApp.properties");33.34. Properties properties = new Properties();35.36. System.out.println("InputStream is: " + inputStream);37.38. // load the inputStream using the Properties39. properties.load(inputStream);40. // get the value of the property41. String propValue = properties.getProperty("abc");42.43. System.out.println("Property value is: " + propValue);44. }45.46.}


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Pretty straight-forward. Now suppose the properties file is not at the root of the application, but

inside a folder (let's name it config) in the web application, something like:

SampleApp.war|

|-------- config

| |------- myApp.properties

|

|

|-------- WEB-INF

|

|---- classes

|

|----- org

|------ myApp

|------- MyPropertiesReader.class

There will just be one line change in the above code:

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1. public void doSomeOperation() throws IOException {2. //Get the inputStream-->This time we have specified the folder name too.3. InputStream inputStream = this.getClass().getClassLoader()4. .getResourceAsStream("config/myApp.properties");5.6. Properties properties = new Properties();7.8. System.out.println("InputStream is: " + inputStream);9.10. //load the inputStream using the Properties11. properties.load(inputStream);12. //get the value of the property13. String propValue = properties.getProperty("abc");14.15. System.out.println("Property value is: " + propValue);16. }17.

That's all that is required to get it working.
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how to read a properties file in a web application

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