（转）Java遍历Properties的所有的元素

转自：http://blog.csdn.net/qq_27093465/article/details/71108181

加载

Properties properties = new Properties();

properties.load(PlayGround.class.getClassLoader().getResourceAsStream("tag.properties"));

输出

/**
     * 输出properties的key和value
     */
    public static void printProp(Properties properties) {
        System.out.println("---------（方式一）------------");
        for (String key : properties.stringPropertyNames()) {
            System.out.println(key + "=" + properties.getProperty(key));
        }

        System.out.println("---------（方式二）------------");
        Set<Object> keys = properties.keySet();//返回属性key的集合
        for (Object key : keys) {
            System.out.println(key.toString() + "=" + properties.get(key));
        }

        System.out.println("---------（方式三）------------");
        Set<Map.Entry<Object, Object>> entrySet = properties.entrySet();//返回的属性键值对实体
        for (Map.Entry<Object, Object> entry : entrySet) {
            System.out.println(entry.getKey() + "=" + entry.getValue());
        }

        System.out.println("---------（方式四）------------");
        Enumeration<?> e = properties.propertyNames();
        while (e.hasMoreElements()) {
            String key = (String) e.nextElement();
            String value = properties.getProperty(key);
            System.out.println(key + "=" + value);
        }
    }