ConfigurationPropertiesClass

Reading and writing configuration for Java application using Properties class

1. Creating a Properties object

Create a Propertiesobject by using empty constructor:

Properties props = new Properties();

Create a Properties object by supplying a default properties list:

Properties defaultProps = new Properties(); // set default properties
Properties props = new Properties(defaultProps); / create main Properties object

2. Loading properties file

Load properties from a .properties file using a FileReader object

File configFile = new File("config.properties");
 
FileReader reader = new FileReader(configFile);
 
Properties props = new Properties();
 
props.load(reader); // load the properties file:

Load properties from a plain text file using an InputStream object:

File configFile = new File("config.properties");

InputStream inputStream = new FileInputStream(configFile);

Properties props = new Properties();
 
props.load(inputStream);

3. Getting properties values

The Properties class has two methods for retrieving value of a property in the properties file:
String getProperty(String key): returns value of the property specified by the given key. It returns null if the key not found.
String getProperty(String key, String defaultValue): like the above method, but this method will return a default value if the key not found.

String host = props.getProperty("host");

4. Setting properties values

Setting value for a specific property is pretty simple, using this sole method:
Object setProperty(String key, String value)
This method returns previous value of the property specified by the given key.

props.setProperty("host", "www.sevdanurgenc.com");

5. Saving properties file

Save to plain text file using a Writerobject:

File configFile = new File("config.properties");
FileWriter writer = new FileWriter(configFile);
props.store(writer, "host settings");

License

SevdanurGENC/ConfigurationPropertiesClass

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