Java中读取资源文件的工具类

package com.justsy;

import java.io.InputStream;
import java.util.Properties;

public class PropertiesManager {

	private String resName = "appstore.properties";

	private Properties prop = new Properties();

	public PropertiesManager configuration() {

		try {
			InputStream is = PropertiesManager.class.getClassLoader()
					.getResourceAsStream(resName);
			prop.load(is);
			if (is != null)
				is.close();
		} catch (Exception e) {
			System.out.println(e + "file " + resName + " not found");
		}
		return this;
	}

	public String getPara(String url) {
		return prop.getProperty(url);
	}
	
	public static void main(String[] args) {
		PropertiesManager pm = new PropertiesManager().configuration() ;
		
		System.out.println(pm.getPara("url"));
	}

}

package com.justsy.eas.util;

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import org.apache.log4j.Logger;
/**
 * 读取配置文件
 */
public class PropertiesReader {
	private Logger logger = Logger.getLogger(Properties.class) ;
	private Properties properties ;
	private static PropertiesReader propertiesReader = new PropertiesReader() ;
	
	private String resName = "eas.properties" ;
	
	// 单例私有化构造方法
	private PropertiesReader(){
		InputStream is = PropertiesReader.class.getClassLoader()
				.getResourceAsStream(resName);
		properties = new Properties() ;
		try {
			properties.load(is);
			logger.info("加载配置信息！！") ;
		} catch (IOException e) {
			logger.warn("加载配置文件出错！") ;
			//e.printStackTrace();
		}
	}
	
	// 得到PropertiesReader的实例
	public static PropertiesReader getInstance(){
		if(propertiesReader==null){
			return new PropertiesReader() ;
		}
		return propertiesReader ;
	}
	
	// 返回所有属性
	public Properties getProperties(){
		return this.properties ;
	}
	
	public static void main(String[] args) {
		Properties properties = PropertiesReader.getInstance().getProperties() ;
		System.out.println(properties.getProperty("dbaddr"));
	}
	
}