普通java程序读取资源文件

public class UserDao {public void update() throws IOException{ InputStream in = UserDao.class.getClassLoader().getResourceAsStream("db.properties");Properties props = new Properties();//map保存props.load(in);System.out.println(props.getProperty("url"));}}

然后在servlet中

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {UserDao dao = new UserDao();dao.update();}

运行servlet就能得到输出