Properties 例子（原创）

Properties 例子（原创）

import  java.io.FileInputStream;
import  java.io.InputStream;
import  java.util.Hashtable;
import  java.util.Properties;
import  java.util.Enumeration;

public   class  LKDB_ParameterLoad {
    
    static LKDB_ParameterLoad lkdb_parameterload;
    private static Hashtable register = new Hashtable();
    Properties p = null;

    private LKDB_ParameterLoad(){}

    public static LKDB_ParameterLoad getInstance(){
        if(lkdb_parameterload == null)
            lkdb_parameterload = new LKDB_ParameterLoad();
        return lkdb_parameterload;
    }

    public Properties getProperties(String fileName){//根据 fileName 获取 Properties
    
        InputStream is = null;

        try{
            p = (Properties)register.get(fileName);
            if(p == null){//根据 fileName 获取 Properties 不存在新建 存在直接返回
                try{
//                    System.out.println("is =  "); 
                    is = new FileInputStream(fileName);
                }catch(Exception e){
                    if(fileName.startsWith("/")){
//                        System.out.println("is = if "); 
                        is = this.getClass().getResourceAsStream(fileName);
                    }else{
//                        System.out.println("is = else "); 
                        is = this.getClass().getResourceAsStream("/" + fileName);
                    }                        
                }
                p = new Properties();
                p.load(is);//载入 
                register.put(fileName, p);// 对应 p = (Properties)register.get(fileName);
                is.close();
            }
        }catch(Exception e){
            e.printStackTrace(System.out);
        }
        return p;
    }

    public String getPropertyValue(String strKey){
        try{
            return p.getProperty(strKey);
        }catch(Exception e){
            e.printStackTrace(System.out);
        }
        return null;
    }
    
   
       
    public static void main(String[] args){
        LKDB_ParameterLoad pl = LKDB_ParameterLoad.getInstance();
        Properties p = pl.getProperties("/database.properties");
        int i=0;
        for(Enumeration propNames = p.propertyNames(); propNames.hasMoreElements();){
            String temp = (String)propNames.nextElement();
            System.out.println("propNames ["+ i +"] ="+temp);
            System.out.println("getProperty ["+ i++ +"] =" + p.getProperty(temp)); 
        }
        pl.register.clear();        
//        System.out.println(" ="+p.getProperty("")); 
    }    
}