Java遍历Properties的所有的元素

Java遍历Properties的所有的元素加载

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);
        }
    }

/**
     * 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);
        }
    }

jar包读取包内properties文件

properties位于src目录下

project

--src

-----package

-----test.properties

Properties p = new Properties();
//从输入流中读取属性列表（键和元素对)
p.load(DB.class.getClass().getResourceAsStream("/test.properties"));
String testKey = p.getProperty("testKey");

不能这样写

 File file = new File("src/test.properties");

输出路径为会带！因为是jar包

java指定编码格式utf-8运行jar

java -Dfile.encoding=utf-8 -jar test.jar