java链接MySQL数据库问题 - Java / Eclipse

class DBUtil{
  private final static String DBDRIVER="com.mysql.jdbc.Driver";
  private final static String DBURL="jdbc:mysql://localhost:3306/warehouse";

  private final static String DBUSER="root";
  private final static String DBPASSWORD="";

  public static Connection getConnection(){
  try{
  Class.forName(DBDRIVER);
  Connection conn=DriverManager.getConnection(DBURL,DBUSER,DBPASSWORD);
  return conn;
  }catch(ClassNotFoundException e){
  System.out.println("数据库驱动不存在");
  System.out.println(e.getMessage());
  }catch(SQLException e){
  System.out.println("数据库连接创建不成功");
  System.out.println(e.getMessage());
  }
  return null;
  }
  public static void close(Connection conn){
  if(conn!=null){
  try{
  conn.close();
  }catch(SQLException e){
  System.out.println("关闭数据库连接出错");
  System.out.println(e.getMessage());
  }