How read all values from properties file in Java with example?

Test.java

1. import java.util.*;
2. import java.io.*;
3. public class Test {
4. public static void main(String[] args)throws Exception{
5. FileReader reader=new FileReader(“db.properties”);
6. Properties p=new Properties();
7. p.load(reader);
8. System.out.println(p.getProperty(“user”));

How do you get all the keys from properties file in Java?

Print all keys with values from a properties file in Java

1. Using keySet() method. Since Properties class extends java.
2. Using stringPropertyNames() method.
3. Using propertyNames() method.
4. Overriding put() method.
5. Using Apache Commons Configuration.

How does Java properties file work?

Properties is a file extension for files mainly used in Java related technologies to store the configurable parameters of an application. Java Properties files are amazing resources to add information in Java. Generally, these files are used to store static information in key and value pair.

How read properties file line by line in Java?

1. import java. io. File;
2. import java. util.
3. public class ReadPropertiesFileJavaMain { public static void main(String args[]) throws IOException {
4. System. out.
5. System. out.
6. public Properties readPropertiesFile(String fileName) throws IOException { InputStream fis = null;
7. fis = this. getClass().
8. prop. load(fis);

Can I Create Read-Only properties in Java?

Creating read-only properties in JavaFX The JavaFX runtime provides two possibilities to create read-only properties. You can either use a wrapper (e.g. ReadOnlyDoubleWrapper) or you can extend an abstract base class (e.g. ReadOnlyDoublePropertyBase). This article shows how these two approaches can be implemented.

How to load properties file in Java?

There are two ways of loading properties files in Java. 1. Using ClassLoader.getResourceAsStream() 2. Using Class.getResourceAsStream() In our example we will use both methods to load a properties file. Following is the content of sample properties file. The properties file will be in package net.viralpatel.resources.

What are the different ways of reading a text file in Java?

Using BufferedReader: This method reads text from a character-input stream.

How do the properties class in Java work?

The java.util.Properties class is the subclass of Hashtable. It can be used to get property value based on the property key. The Properties class provides methods to get data from the properties file and store data into the properties file.