利用Java如何实现获取properties配置文件

//方式一InputStream in = new BufferedInputStream(new FileInputStream("文件路径名"));Properties p = new Properties();p.load(in);System.out.println(p.getProperty("version"));//方式二InputStream ins = PropertiesUtil.class.getResourceAsStream("文件路径名");Properties ps = new Properties();ps.load(ins);System.out.println(ps.getProperty("version"));//方式三InputStream inss = PropertiesUtil.class.getClassLoader().getResourceAsStream("文件名");Properties pss = new Properties();pss.load(inss);System.out.println(pss.getProperty("version"));//方式四InputStream insss = ClassLoader.getSystemResourceAsStream("文件名");Properties psss = new Properties();psss.load(insss);System.out.println(pss.getProperty("version"));