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Код


import java.util.*;
import java.io.*;

public class Configuration {
    private static Configuration _instance = null;

    private Properties props = null;

    private Configuration() {
         props = new Properties();
     try {
        FileInputStream fis = new FileInputStream(
                    new File(config.xml”));
        props.load(fis);
     }
     catch (Exception e) {
        //
     }
    }

    public synchronized static Configuration getInstance() {
        if (_instance == null)
            _instance = new Configuration();
        return _instance;
    }

    public synchronized String getUrl() {
        String value = null;
        ///////////////////////////////
        return value;
    }
    public synchronized String getDriver() {
        String value = null;
        ///////////////////////////////
        return value;
    }
    public synchronized String getPass() {
        String value = null;
        ///////////////////////////////
        return value;
    }
    public synchronized String getLogin() {
        String value = null;
        ///////////////////////////////
        return value;
    }
}

Код


<?xml version="1.0" encoding="Windows-1251"?>
<!-- Database configuration -->
<configuration>
<database>
    <driver>mysql</driver>
    <dataURL>localhost</dataURL>
    <userName>root</userName>
    <password>777</password>
</database>
</configuration>

Код


import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement
public class Configuration
{
    private Database database;

    @XmlElement
    public Database getDatabase()
    {
        return database;
    }

    public void setDatabase(Database database)
    {
        this.database = database;
    }
}

Код


import javax.xml.bind.annotation.XmlElement;

public class Database
{
    private String driver;
    private String dataUrl;
    private String userName;
    private String password;

    @XmlElement
    public String getDataUrl()
    {
        return dataUrl;
    }

    public void setDataUrl(String dataUrl)
    {
        this.dataUrl = dataUrl;
    }

    @XmlElement
    public String getDriver()
    {
        return driver;
    }

    public void setDriver(String driver)
    {
        this.driver = driver;
    }

    @XmlElement
    public String getPassword()
    {
        return password;
    }

    public void setPassword(String password)
    {
        this.password = password;
    }

    @XmlElement
    public String getUserName()
    {
        return userName;
    }

    public void setUserName(String userName)
    {
        this.userName = userName;
    }
}

Код


import java.io.StringReader;
import java.io.StringWriter;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;

public class App 
{
    public static void main( String[] args ) throws JAXBException
    {
        // создаем модель
        Configuration configuration = new Configuration();
        Database database = new Database();

        database.setDataUrl("jdbc:derby://localhost:1527/sample");
        database.setDriver("org.apache.derby.jdbc.ClientDriver");
        database.setUserName("root");
        database.setPassword("root");
        configuration.setDatabase(database);

        // готовим контекст JAXB
        JAXBContext context = JAXBContext.newInstance(Configuration.class, Database.class);

        // создаем маршаллер
        Marshaller marshaller = context.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);

        // записываем данные в XML.
        StringWriter stringWriter = new StringWriter();
        marshaller.marshal(configuration, stringWriter);
        System.out.println(stringWriter);

        // создаем анмаршаллер и парсим xml.
        Unmarshaller unmarshaller = context.createUnmarshaller();
        Configuration parsedConfiguration =
                (Configuration) unmarshaller.unmarshal(new StringReader(stringWriter.toString()));

        System.out.println(parsedConfiguration.getDatabase().getDataUrl());
        System.out.println(parsedConfiguration.getDatabase().getDriver());
        System.out.println(parsedConfiguration.getDatabase().getUserName());
        System.out.println(parsedConfiguration.getDatabase().getPassword());
    }
}