非静态方法读取
public void getConnection2() throws IOException{
InputStream is = getClass().getClassLoader().getResourceAsStream("jdbc.properties");
Properties pro = new Properties();
pro.load(is);
System.out.println(pro.getProperty("username"));
}
但是静态方法不可以，静态方法可以通过如下方式：
public static Connection getConnection() {
try {
//关键两行代码
ResourceBundle bundle = ResourceBundle.getBundle("jdbc");
System.out.println(bundle.getString("username"));//可以读取key对应的value
//Class.forName(DRIVER_CLASS);
//conn = DriverManager.getConnection(DATABASE_URL,DATABASE_USRE, DATABASE_PASSWORD);
} catch (Exception e) {
e.printStackTrace();
}
return conn;
}