配置文件使用实例

从配置文件读取内容进行实例化

读取配置文件的类

class PropertyMgr {
    private static Properties props = new Properties();
    
    static {
        try {
            props.load(Test.class.getClassLoader().getResourceAsStream("observer/observer.properties"));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    public static String getProperty(String key) {
        return props.getProperty(key);
    }
}

配置文件

observers=com.bjsxt.dp.observer.Dad,com.bjsxt.dp.observer.GrandFather,com.bjsxt.dp.observer.Dog

使用配置文件

    public static void main(String[] args) {
        Child c = new Child();

        String[] observers = PropertyMgr.getProperty("observers").split(",");

        for(String s : observers) {
            try {
                c.addWakenUpListener((WakenUpListener)(Class.forName(s).newInstance()));
            } catch (InstantiationException e) {
                e.printStackTrace();
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            } catch (ClassNotFoundException e) {
                e.printStackTrace();
            }
        }
        new Thread(c).start();
    }