JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Program: How to load Properties file from the classpath?


Description:

This example shows how to load properties file from application classpath. Here we are using this.getClass().getResourceAsStream() to load the properties file in the classpath. Make sure that the properties file is available in the class path.


Code:
package com.java2novice.properties;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

public class MyPropWithinClasspath {

	private Properties prop = null;
	
	public MyPropWithinClasspath(){
		
		InputStream is = null;
		try {
			this.prop = new Properties();
			is = this.getClass().getResourceAsStream("/sample.properties");
			prop.load(is);
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	public String getPropertyValue(String key){
		return this.prop.getProperty(key);
	}
	
	public static void main(String a[]){
		
		MyPropWithinClasspath mpc = new MyPropWithinClasspath();
		System.out.println("db.host: "+mpc.getPropertyValue("db.host"));
		System.out.println("db.user: "+mpc.getPropertyValue("db.user"));
		System.out.println("db.password: "+mpc.getPropertyValue("db.password"));
	}
}

sample.properties
db.host=appdomain.java2novice.com
db.user=java2novice
db.password=mypassword
db.service=orcl

Output:
db.host: appdomain.java2novice.com
db.user: java2novice
db.password: mypassword
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List of Properties class sample programs:

  1. How to load Properties file from a file system?
  2. How to load Properties file from the classpath?
  3. How to load Properties file from a static block or static method?
  4. How to assign default values for unavailable keys in properties file?
  5. How to get all keys from properties file?
  6. How to create and store property file dynamically?
  7. How to store property file as xml file?
  8. How to load property file using class name in java?
Knowledge Centre
Difference between while and do-while
The while statement verifies the condition before entering into the loop to see whether the next loop iteration should occur or not. The do-while statement executes the first iteration without checking the condition, it verifies the condition after finishing each iteration. The do-while statement will always execute the body of a loop at least once.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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