java.sql.SQLException: 關閉的連接

/**
* 獲得數據庫連接
* @return
*/
public Connection getConnection(){
try {
//判斷有問題
//if(conn != null)
//應該判斷連接是否已關閉
if(conn != null && !conn.isClosed())
return conn;

String dbDriver = DBDRIVER;
String dbUrl = DBURL;
String dbUser = DBUSER;
String dbPwd = DBPWD;

Class.forName(dbDriver).newInstance();
conn = DriverManager.getConnection(dbUrl, dbUser, dbPwd);

if(conn == null)
throw new Exception("獲取數據庫連接失敗！");
} catch (Exception e) {
e.printStackTrace();
}

return conn;
}

 

轉載自：https://blog.csdn.net/hongweigg/article/details/7441648