Question

我有主页index.jsp。从jsp页面requset已发送到database.But数据库连接没有发生。它没有给出任何错误，它给出空白页面。即使我已经使用tomcatserver将mysql connector.jar添加到库file.am。有人可以帮我解决问题。这是完整的代码

    disply.java


public class MyDb {
    Connection con;
    public Connection getcon()  { 
        try {
            Class.forName("com.mysql.jdbc.Driver");
            DriverManager.getConnection("jdbc:mysql://localhost:3306/studentinfo", "root", "adminuser");

        } catch (ClassNotFoundException ex) {
            Logger.getLogger(MyDb.class.getName()).log(Level.SEVERE, null, ex);
        } catch (SQLException ex) {
            Logger.getLogger(MyDb.class.getName()).log(Level.SEVERE, null, ex);
        }
        return con;

    }
}

Answer 1

您必须将连接对象分配给从DriverManager返回的连接

 Connection con = null;
 ....
 con = DriverManager.getConnection("jdbc:mysql......

jsp servlet Mysql数据库连接错误

1 个答案: