java.io Code Samples

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How do I load properties from XML file?

Reading XML properties can be easily done using the Properties.loadFromXML() method. Just like reading the properties from a file that contains a key=value pairs, the XML file will also contains a key and value wrapped in the following XML format.

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">
<properties>
  <comment>Application Configuration</comment>
  <entry key="data.folder">D:\App\Data</entry>
  <entry key="jdbc.url">jdbc:mysql://localhost/mydb</entry>
</properties>


package org.kodejava.example.io;

import java.io.FileInputStream;
import java.util.Properties;

public class LoadXmlProperties {
    public static void main(String[] args) {
        LoadXmlProperties lxp = new LoadXmlProperties();
        try {
            Properties properties = lxp.readProperties();
            /*
             * Display all properties information
             */
            properties.list(System.out);

            /*
             * Read the value of data.folder and jdbc.url configuration
             */
            String dataFolder = properties.getProperty("data.folder");
            System.out.println("dataFolder = " + dataFolder);
            String jdbcUrl = properties.getProperty("jdbc.url");
            System.out.println("jdbcUrl = " + jdbcUrl);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public Properties readProperties() throws Exception {
        Properties properties = new Properties();
        FileInputStream fis = new FileInputStream("configuration.xml");
        properties.loadFromXML(fis);

        return properties;
    }
}

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