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Loading configuration parameters from textfile into a program
Loading parameters into a program is easily handled in Java through the Properties class.The only thing that has to be done is to create an instance of the Properties class and one instanceFileInputStream class that points to the configuration file.The actual loading of the parameters are done through the method load() on the Properties object.In the example below parameters are read from the configuration file and then printed out.
This is what the sample configuration file looks like:
# System configuration
# Comments will automatically be excluded by the program.
parameter1=value1
parameter2=value2
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Properties;
/**
* Main.java*
* @author www.javadb.com
*/
publicclass Main {
Properties config;
/**
* Loads configuration parameters from a textfile and print them out.
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*/
publicvoid loadConfigFile() {
//Load configuration file
String filename = "conf/systemconfig.txt";
config = new Properties();
try {
config.load(new FileInputStream(filename));
} catch (FileNotFoundException ex) {
ex.printStackTrace();return;
} catch (IOException ex) {
ex.printStackTrace();
return;
}
//Print out the configuration parameters
Enumeration en = config.keys();
System.out.println("********** System configuration **********");while (en.hasMoreElements()) {
String key = (String) en.nextElement();
System.out.println(key + " => " + config.get(key));
}
}
/**
* Starts the program
*
* @param args the command line arguments
*/
publicstaticvoid main(String[] args) {
new Main().loadConfigFile();
}
}
This is the output after printing out the loaded configuration parameters:
********** System configuration **********
parameter2 => value2
parameter1 => value1
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