You can do it in following way:

1. Set the properties first in the Properties object by using object. setProperty(String obj1, String obj2) .
2. Then write it to your File by passing a FileOutputStream to properties_object. store(FileOutputStream, String) .

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 to read config. properties file:

1. Create a java class named ReadPropertyFile. java inside the same project where config. properties file is created → include “public static main” method and Finish.
2. First we have to create object of Properties class.

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”));

Properties is a subclass of Hashtable. It is used to maintain a list of values in which the key is a string and the value is also a string i.e; it can be used to store and retrieve string type data from the properties file. Properties class can specify other properties list as it’s the default.

How to read a properties file in java in the original order?

1. Properties props = new Properties();
2. props.load(new FileInputStream(args[0]));
3. for (Enumeration e = props.propertyNames(); e.hasMoreElements();) {
4. }

Read properties file in Jsp

1. package com. codewale. example;
2. IOException;
3. InputStream;
4. Properties;
5. public class ReadFromPropertiesFile {
6. ///////////call this method from jsp.
7. public static String getProperties(String key) throws IOException.
8. {

Update Property File PropertiesConfiguration provided . setProperty() method to update the particular property value. To save your configurations, You need to use save() method, Which is associated property configuration builder. Finally, verify the “config.

1. Reading properties file in Spring using XML configuration.
2. Reading properties file in Spring using @PropertySource Annotation.
3. Using @PropertySource Annotation with Spring’s Environment.
4. Property overriding with @PropertySource.
5. Using ignoreResourceNotFound attribute with @PropertySource.

Instantiate an InputStreamReader class bypassing your InputStream object as a parameter.

The configuration file is a standard property file as you know them from Java. Inside this property file you can set properties that configure the various Logger’s and Handler’s used in your application.

Properties file in Java is a text file which stores data in form of key and value, key being known as property. Java allows you to read value of property by providing its name which makes it easy to access configuration settings.