java读取Properties中的参数

//根据key读取value
 public static String readValue(String filePath,String key) {
  Properties props = new Properties();
        try {
         InputStream in = new BufferedInputStream (new FileInputStream(filePath));
         props.load(in);
         String value = props.getProperty (key);
            System.out.println(key+value);
            return value;
        } catch (Exception e) {
         e.printStackTrace();
         return null;
        }
 }

1.用ResourceBundle

ResourceBundle rb = ResourceBundle.getBundle("env"); //没有.properties结尾
String driver = rb.getString("jdbc.driverClassName");