This tutorial will explain how to access properties file through Java coding. A properties file can be accessed with the ResourceBundle class which resides in the java.util package. In the example below I’m going to provide is based on the properties file staying in the same package. For properties file staying outside the package, we need to set the CLASSPATH variable pointing to the same folder where the external properties file is staying.
First we should have the project structure like the one given below-
And here are the code samples of all the classes.
First the properties file having some sample values as key-value structures.
TCTALK.properties
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NAME=TECHCUBETALK QUOTE=I Love TechCuBeTalk.com |
PropertyReader.java-
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package com.techcubetalk.app.util;
import java.util.MissingResourceException; import java.util.ResourceBundle;
/** * PropertyReader.java - [This static utility class loads and * reads the values from the application properties file] * * @author TechCuBeTalk * @version 1.0 */ public class PropertyReader { private static final String BUNDLE_NAME = “com.techcubetalk.app.resource.TCTALK”; private static final ResourceBundle RESOURCE_BUNDLE = ResourceBundle.getBundle(BUNDLE_NAME);
public static String getValue(String key){ try{ return RESOURCE_BUNDLE.getString(key); }catch(MissingResourceException mex){ return “”; }catch(Exception ex){ return “NOT FOUND”; } } }
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This class loads the properties file from the system. This is a static utility class. In the bundle name we’ve given the fully qualified package name with properties file name. Please note here we have mentioned the name only and not the extension “properties”. getValue() method takes a string key and returns the corresponding value from the properties file. If it can’t load the properties file or can’t find the key it throws MissingResourceException.
Now the invoker main class file-
PropertyReaderMain.java
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package com.techcubetalk.app.main;
import com.techcubetalk.app.util.PropertyReader;
public class PropertyReaderMain {
public static void main(String[] args) { System.out.println(“Testing Property Reader…”); System.out.println(“Invoking key …”); System.out.println(“Name=”+PropertyReader.getValue(“NAME”)); System.out.println(“Quotation=”+PropertyReader.getValue(“QUOTE”)); } }
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This is self explanatory.
To know about ResourceBundle class go to http://java.sun.com/j2se/1.4.2/docs/api/java/util/ResourceBundle.html
Here is the output:
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I find it very helpfull to solve my problem.