package?util; import?java.sql.Connection; import?java.sql.DriverManager; public?class?DBHelper?{ private?static?final?String?driver="com.mysql.jdbc.Driver"; private?static?final?String?url="jdbc:mysql://localhost:3006/imooc"; private?static?final?String?username="root"; private?static?final?String?password="123456"; private?static?Connection?conn=null; //靜態(tài)代碼塊負(fù)責(zé)加載驅(qū)動(dòng) static{ try{ Class.forName(driver); }catch(Exception?ex){ ex.printStackTrace(); } } //單例模式返回?cái)?shù)據(jù)庫(kù)連接對(duì)象 public?static?Connection?getConnection()?throws?Exception{ if(conn==null){ conn=DriverManager.getConnection(url,?username,?password); return?conn; } return?conn; } //判斷連接是否成功 public?static?void?main(String[]?args)?{ try?{ Connection?conn=DBHelper.getConnection(); if(conn!=null){ System.out.println("數(shù)據(jù)庫(kù)連接正常"); }else{ System.out.println("數(shù)據(jù)庫(kù)連接異常"); } }?catch?(Exception?e)?{ //?TODO?Auto-generated?catch?block e.printStackTrace(); } } }代碼如上？請(qǐng)問(wèn)要怎么處理？