java读取properties配置文件

项目目录结构:

ClassLoader

properties文件只能在类目录下，也就是对应于这里src的相对路径

		Properties p1 = new Properties();
		InputStream inputStream = Program.class.getClassLoader()
				.getResourceAsStream("com/zrun/app1.properties");
		// .getResourceAsStream("config/app2.properties");
		// .getResourceAsStream("app3.properties");
		p1.load(inputStream);
		System.out.println(p1.getProperty("appid"));

BufferedReader

实际上就是从绝对路径加载文件流，配置文件在任何地方都可以，不一定要在类目录下

		Properties properties = new Properties();
		BufferedReader bufferedReader = new BufferedReader(
				new FileReader(
						"E:\08-javadev\TestReadPropertiesFile\config\app4.properties"));
		InputStream inStream = new FileInputStream(
				new File(
						"E:\08-javadev\TestReadPropertiesFile\config\app4.properties"));
		properties.load(bufferedReader);
		// properties.load(inStream);
		System.out.println(properties.getProperty("appid"));

ResourceBundle

properties文件只能在类目录下，也就是对应于这里src的相对路径

		ResourceBundle resource = ResourceBundle.getBundle("com/zrun/app1");
		// .getBundle("config/app2");
		// .getBundle("app3");
		System.out.println(resource.getString("appid"));