PropertiesUtil demo

package com.spl.save.wmos.base.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.URI;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import java.util.ResourceBundle;  

import com.spl.kernel.base.util.KnSystemUtils;

/**
 *
 * PropertiesUtil.java
 *
 * @desc properties 资源文件解析工具
 * @author Guoxp
 * @datatime Apr 7, 2013 3:58:45 PM
 *
 */
public class PropertiesUtil {    

    private Properties props;
    private URI uri;
    private static PropertiesUtil ourInstance = new PropertiesUtil();
    public static PropertiesUtil getInstance() {
        return ourInstance;
    }
    public PropertiesUtil(){

    }
    public PropertiesUtil(String fileName){
        readProperties(fileName);
    }
    private void readProperties(String fileName) {
        try {
            props = new Properties();    

            InputStream fis =getClass().getResourceAsStream(fileName);
            InputStreamReader re=new InputStreamReader(fis,"utf-8");
            props.load(re);
            uri = this.getClass().getResource("/config/res/wmos_std.properties").toURI();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    /**
     * 获取某个属性
     */
    public String getProperty(String key){
        return props.getProperty(key);
    }
    /**
     * 获取所有属性，返回一个map,不常用
     * 可以试试props.putAll(t)
     */
    public Map getAllProperty(){
        Map map=new HashMap();
        Enumeration enu = props.propertyNames();   

        while (enu.hasMoreElements()) {
            String key = (String) enu.nextElement();
            String value = props.getProperty(key);
            map.put(key, value);
        }
        return map;
    }
    /**
     * 在控制台上打印出所有属性，调试时用。
     */
    public void printProperties(){
        props.list(System.out);
    }
    /**
     * 写入properties信息
     */
    public void writeProperties(String key, String value) {
        try {
        OutputStream fos = new FileOutputStream(new File(uri));
            props.setProperty(key, value);
            // 将此 Properties 表中的属性列表（键和元素对）写入输出流
            props.store(fos, "『comments』Update key：" + key);
        } catch (Exception e) {
        e.printStackTrace();
        }
    }       

}