做一个单子模式的类，只加载一次属性文件

package com.softeem.demo;

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

/**
* @authorleno 单子模式，保证在整个应用期间只加载一次配置属性文件
*/广州达内http://www.gztarena.com/
public class Singleton {

private static Singleton instance;
private static final String CONFIG_FILE_PATH = "E:\\config.properties";
private Properties config;

private Singleton() {
config = new Properties();
InputStream is;
try {
is = new FileInputStream(CONFIG_FILE_PATH);
config.load(is);
is.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

public static Singleton getInstance() {
if (instance == null) {
instance = new Singleton();
}
return instance;
}

public Properties getConfig() {
return config;
}

public void setConfig(Properties config) {
this.config = config;
}
}