struts2\src\com\i18n

package com.i18n;

import java.util.Locale;

public class Test1
{
	public static void main(String[] args)
	{
		Locale[] locales = Locale.getAvailableLocales();
		
		for(Locale locale : locales)
		{
//			System.out.println(locale.getDisplayCountry() + " : " + locale.getCountry());
			
			System.out.println(locale.getDisplayLanguage() + " : " + locale.getLanguage());
		}
	}

}

package com.i18n;

import java.util.*;

public class Test2
{
	public static void main(String[] args)
	{
		Locale locale = Locale.US;
		
		ResourceBundle bundle = ResourceBundle.getBundle("hellofile",locale);
		
		String value = bundle.getString("hello");
		
		System.out.println(value);
		
	}
}

package com.i18n;

import java.util.*;
import java.text.*;

public class Test3
{
	public static void main(String[] args)
	{
		Locale locale = Locale.US;
		
		ResourceBundle bundle = ResourceBundle.getBundle("hellofile",locale);
		
		String value = bundle.getString("hello");
		
		String result = MessageFormat.format(value,new Object[]{"北京"});
		
		
		System.out.println(result);
	}
}