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Java Properties File: How to Read config.properties Values in Java?
.properties is a file extension for files mainly used in Java related
technologies to store the configurable parameters of an application.
They can also be used for storing strings for Internationalization and
localization; these are known as Property Resource Bundles.Each parameter is stored as a pair of strings, one storing the name of the parameter (called the
key/map), and the other storing the value.Below is a sample Java program which demonstrate you how to
retrieve/read config.properties values in Java. For update follow this tutorial.Another must read: Read config.properties value using Spring “singleton” Scope in your Java Enterprise Application
We will create 3 files:
- CrunchifyReadConfigMain.java
- CrunchifyGetPropertyValues.java
- config.properties file
getPropValues() method from class CrunchifyGetPropertyValues.java.Lets 1st create
config.properties file.- Create Folder “
resources” if your project doesn’t have it. - create
config.propertiesfile with below value.
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#Crunchify Properties
user=Crunchify
company1=Google
company2=eBay
company3=Yahoo
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package crunchify.com.tutorial;
import java.io.IOException;
/**
* @author Crunchify.com
*
*/
public class CrunchifyReadConfigMain {
public static void main(String[] args) throws IOException {
CrunchifyGetPropertyValues properties = new CrunchifyGetPropertyValues();
properties.getPropValues();
}
}
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package crunchify.com.tutorial;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Date;
import java.util.Properties;
/**
* @author Crunchify.com
*
*/
public class CrunchifyGetPropertyValues {
String result = "";
InputStream inputStream;
public String getPropValues() throws IOException {
try {
Properties prop = new Properties();
String propFileName = "config.properties";
inputStream = getClass().getClassLoader().getResourceAsStream(propFileName);
if (inputStream != null) {
prop.load(inputStream);
} else {
throw new FileNotFoundException("property file '" + propFileName + "' not found in the classpath");
}
Date time = new Date(System.currentTimeMillis());
// get the property value and print it out
String user = prop.getProperty("user");
String company1 = prop.getProperty("company1");
String company2 = prop.getProperty("company2");
String company3 = prop.getProperty("company3");
result = "Company List = " + company1 + ", " + company2 + ", " + company3;
System.out.println(result + "\nProgram Ran on " + time + " by user=" + user);
} catch (Exception e) {
System.out.println("Exception: " + e);
} finally {
inputStream.close();
}
return result;
}
}
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Company List = Google, eBay, Yahoo
Program Ran on Mon May 13 21:54:55 PDT 2013 by user=Crunchify
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