properties文件加载的六种方法

加载项目properties文件的六种方法,其中四种都是通过Properties类加载inputStream读取,后两种通过ResourcesBundle类和其子类来加载

    /**
     * 通过inputStream加载配置文件到properties对象
     */

    private void getPropertiesByInputStream_One() throws IOException {
        //全路径
        String path = "/Users/grahamliu/idea-workspace/AppiumAIDemo/src/main/resources/appium.properties";
        Properties properties = new Properties();

        InputStream inputStream = new BufferedInputStream(new FileInputStream(path));
        properties.load(inputStream);

        System.out.println(this.getClass().getName()+"+"+Thread.currentThread().getStackTrace()[1].getMethodName());

        System.out.println(properties.getProperty("appiumUrl"));
    }

    /**
     * 通过class类getResourceAsStream方法加载配置文件流
     */
    private void getPropertiesByInputStream_Two() throws IOException {
        //路径/开头，表示从classpath下取路径
//        String path = "/appium.properties";
        //路径不为/开头，从当前类所在包下取
        String path = "appiumRelative.properties";

        Properties properties = new Properties();
        InputStream inputStream = this.getClass().getResourceAsStream(path);
        properties.load(inputStream);

        System.out.println(this.getClass().getName()+"+"+Thread.currentThread().getStackTrace()[1].getMethodName());

        System.out.println(properties.getProperty("appiumUrl"));
    }

    /**
     *通过class的类加载器getClassLoader加载配置
     */
    private void getPropertiesByInputStream_Three() throws IOException{
        //getClassLoader默认加载路径就是classpath，规定不需要用/开头文件路径
        String path = "appium.properties";

        Properties properties= new Properties();
        InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream(path);
        properties.load(inputStream);

        System.out.println(this.getClass().getName()+"+"+Thread.currentThread().getStackTrace()[1].getMethodName());

        System.out.println(properties.getProperty("appiumUrl"));
    }

    /**
     * 通过ClassLoader类静态方法加载
     * 2020.11.3 最新经验,该方法可能在web项目,或者mvn -exec:运行时读取不到配置文件,需要用上面的方法
     */
    private void getPropertiesByInputStream_Four() throws IOException{
        //ClassLoader默认加载路径就是classpath，规定不需要用/开头文件路径
        String path = "appium.properties";

        Properties properties = new Properties();
        InputStream inputStream = ClassLoader.getSystemResourceAsStream(path);
        properties.load(inputStream);

        System.out.println(this.getClass().getName()+"+"+Thread.currentThread().getStackTrace()[1].getMethodName());

        System.out.println(properties.getProperty("appiumUrl"));
    }

    /**
     * 通过ResourceBundle的构造方法getBundle
     */
    private void getPropertiesByResourceBundle_Five(){
        //这个getBundle()方法的参数相对同目录路径，并去掉.properties后缀，否则将抛异常
        String path = "appium";
        ResourceBundle resourceBundle  = ResourceBundle.getBundle(path);

        System.out.println(this.getClass().getName()+"+"+Thread.currentThread().getStackTrace()[1].getMethodName());

        System.out.println(resourceBundle.getString("appiumUrl"));
    }

    /**
     * 通过ResourceBundle子类PropertyResourceBundle加载inputStream
     */
    private void getPropertiesByResourceBundle_Six() throws IOException{
        String path = "/Users/grahamliu/idea-workspace/AppiumAIDemo/src/main/resources/appium.properties";
        InputStream inputStream = new BufferedInputStream(new FileInputStream(path));
        ResourceBundle resourceBundle = new PropertyResourceBundle(inputStream);

        System.out.println(this.getClass().getName()+"+"+Thread.currentThread().getStackTrace()[1].getMethodName());

        System.out.println(resourceBundle.getString("appiumUrl"));
    }