java中读取资源文件的方法

1.使用java.util.Properties类的load()方法示例：//文件在项目下。不是在包下！！InputStream in = new BufferedInputStream(new FileInputStream("demo.properties")) ;Properties p = new Properties();p.load(in) ;String className2 = p.getProperty("database.driver");String url = p.getProperty("database.url");String user = p.getProperty("database.user");String password = p.getProperty("database.pass");2. 使用java.util.Resourcebundle类的getbundle()方法//前面没有“/”代表当前类的目录示例：//文件和类在同一个包下，注意它的文件名和后缀！！是调换的，ResourceBundle resource = ResourceBundle.getBundle("properties.jdbc");String className = resource.getString("database.driver");String url = resource.getString("database.url");String user = resource.getString("database.user");String password = resource.getString("database.pass");3.使用java.util.PropertyResourceBundle类的构造函数示例：// 文件在项目下 或者 src/demo.properties// 在 src/demo.properties 写成 new FileInputStream("src/demo.properties")InputStream in = new BufferedInputStream(new FileInputStream("demo.properties"));ResourceBundle rb = new PropertyResourceBundle(in) ;String className4 = rb.getString("database.url");4.使用class变量的getresourceasstream()方法示例：InputStream in =Properties.class.getResourceAsStream("/properties/jdbc.properties");// 包点类名下的。// 如果找不到带有该名称的资源，则返回 nullProperties p = new Properties();p.load(in);System.out.println(p.getProperty("database.url"));5.使用class.getclassloader()所得到的java.lang.classloader的getresourceasstream()方法// properties 文件 要放在src下面，否则找不到啊示例：InputStream in = 类名.class.getClassLoader().getResourceAsStream("jdbc.properties");Properties p = new Properties() ;p.load(in);System.out.println(p.getProperty("database.pass"));6.使用java.lang.classloader类的getsystemresourceasstream()静态方法示例：// 同包名下InputStream in = ClassLoader.getSystemResourceAsStream("properties/jdbc.properties");Properties p = new Properties() ;p.load(in) ;System.out.println(p.getProperty("database.user"));总结：如果是 在WEB上读取properties文件，写成下面这种。上面写的那些只在 JavaSE 中String path = Thread.currentThread().getContextClassLoader().getResource("").getPath();System.out.println(path);InputStream in = new FileInputStream(new File(path+File.separator+"mysql.properties"));Properties prop = new Properties();