//加载文件
public static void testLoadProperties() throws Exception {
    Properties properties = new Properties();

    InputStream in = new FileInputStream("E:/itcast/config.properties");
    properties.load(in); // 加载
    in.close();

    System.out.println(properties);
}

//写配置文件
public static void testStoreProperties() throws Exception {

    // 准备配置信息

    Properties properties = new Properties();

    properties.setProperty("name", "李四");

    properties.setProperty("age", "20");

 

    // 准备

    OutputStream out = new FileOutputStream("d:/my.properties");

    String comments = "这是我的配置文件";

 

    // 写出去

    properties.store(out, comments);

    out.close();

}

static Properties properties ;
    
    static{
        try {
            properties = new Properties();
            Class clazz = dd.class; 
            InputStream inputStream = clazz.getResourceAsStream("/my.properties"); //  "/"??????Classpath??·????           getResourceAsStream ?÷???????????·????????????????·????
            properties.load(inputStream);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    
    public static void main(String[] args) {
        System.out.println("???·????"+ new File(".").getAbsolutePath() );
        System.out.println( properties.getProperty("userName")+":"+properties.getProperty("password"));
        
    }