Java 读取属性文件

// messages.hello.properties
id=001
name=惜缘
love=I think,therefor i am.
friends=Hi! {0} and {1} ,how are you?  

// org.PropertiesUtil.java
package org;

import java.io.UnsupportedEncodingException;
import java.text.MessageFormat;
import java.util.Locale;
import java.util.MissingResourceException;
import java.util.ResourceBundle;

public class PropertiesUtil {
	private static String encoding = "UTF-8";
	/**
	 * read the message with key from the resource bundle
	 * @param bundlePath
	 * @param key
	 * @return
	 */
	public static String getString(String bundlePath,String key){
		return getString(bundlePath,key,null);
	}
	/**
	 * read the message with key from the resource bundle
	 * @param bundlePath
	 * @param key
	 * @param args
	 * @return
	 */
	public static String getString(String bundlePath,String key,Object[] args){
		// we will throw a MessingResourceException if the bundle name is invalid
		ResourceBundle bundle = getBundle(bundlePath);
		try{
			String msg = bundle.getString(key);
			if(msg == null){
				return "";
			}
			// change the message encoding
			msg = convertISO(msg);
			return msg = MessageFormat.format(msg, args);
		} catch(MissingResourceException e){
			return "";
		}
	}
	/**
	 * get ResourceBundle with bundlePath
	 * @param bundlePath
	 * @return
	 * @throws MissingResourceException if resource is messing
	 */
	private static ResourceBundle getBundle(String bundlePath){
		Locale locale = Locale.getDefault();
		ResourceBundle bundle = ResourceBundle.getBundle(bundlePath,locale,getClassLoader());
		return bundle;
	}
	/**
	 * get the current ClassLoader
	 * @return
	 */
	protected static ClassLoader getClassLoader(){
		return PropertiesUtil.class.getClassLoader();
	}
	/**
	 * convert msg encoding
	 * @param msg
	 * @return
	 */
	public static String convertISO(String msg){
		if(msg != null){
			try{
				return new String(msg.getBytes("iso-8859-1"),getEncoding());
			} catch(UnsupportedEncodingException e){
				e.printStackTrace();
			}
		}
		return "";
	}
	/**
	 * get encoding
	 * @return
	 */
	public static String getEncoding() {
		return encoding;
	}
	/**
	 * set encoding
	 * @param encoding
	 */
	public static void setEncoding(String encoding) {
		PropertiesUtil.encoding = encoding;
	}
}

// test.PropertiesUtilTest.java
package test;

import org.PropertiesUtil;

public class PropertiesUtilTest {
	public static void main(String[] args) {
		final String BUNDLE_PATH = "messages.hello";
		String id = PropertiesUtil.getString(BUNDLE_PATH, "id");
		String name = PropertiesUtil.getString(BUNDLE_PATH, "name");
		String love = PropertiesUtil.getString(BUNDLE_PATH, "love");
		String friends = PropertiesUtil.getString(BUNDLE_PATH, "friends",
				                                  new Object[]{"boy","girl"});
		
		System.out.println(id);
		System.out.println(name);
		System.out.println(love);
		System.out.println(friends);
	}
}

// console out 
001
惜缘
I think,therefor i am.
Hi! boy and girl ,how are you?