properties文件加載的六種方法

加載項目properties文件的六種方法,其中四種都是通過Properties類加載inputStream讀取,后兩種通過ResourcesBundle類和其子類來加載

    /**
     * 通過inputStream加載配置文件到properties對象
     */

    private void getPropertiesByInputStream_One() throws IOException {
        //全路徑
        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"));
    }

    /**
     * 通過class類getResourceAsStream方法加載配置文件流
     */
    private void getPropertiesByInputStream_Two() throws IOException {
        //路徑/開頭，表示從classpath下取路徑
//        String path = "/appium.properties";
        //路徑不為/開頭，從當前類所在包下取
        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"));
    }

    /**
     *通過class的類加載器getClassLoader加載配置
     */
    private void getPropertiesByInputStream_Three() throws IOException{
        //getClassLoader默認加載路徑就是classpath，規定不需要用/開頭文件路徑
        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"));
    }

    /**
     * 通過ClassLoader類靜態方法加載
     * 2020.11.3 最新經驗,該方法可能在web項目,或者mvn -exec:運行時讀取不到配置文件,需要用上面的方法
     */
    private void getPropertiesByInputStream_Four() throws IOException{
        //ClassLoader默認加載路徑就是classpath，規定不需要用/開頭文件路徑
        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"));
    }

    /**
     * 通過ResourceBundle的構造方法getBundle
     */
    private void getPropertiesByResourceBundle_Five(){
        //這個getBundle()方法的參數相對同目錄路徑，並去掉.properties后綴，否則將拋異常
        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"));
    }

    /**
     * 通過ResourceBundle子類PropertyResourceBundle加載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"));
    }