我使用netbeans8做了一个项目，在这个项目中，我必须连接到mysql数据库并在表中显示内容。当我使用ide的连接工作得很好！但是当我清理并构建一个可执行jar时，我的程序无法连接到数据库。。。有人能帮我吗？谢谢您！
这就是我使用的代码：

@FXML
    private void loadDB() {
        //cleaning all fields from table View and removing previous elements from studentList before show new content;
        tableView.getItems().clear();
        studentList.removeAll();

        String stg = dataBaseField.getText();
        //Expected string format:
        //jdbc:mysql://mymysql.senecacollege.ca/eden_burton?user=jac444_183a01&password=eqXE@4464

        try {
            Class.forName("com.mysql.cj.jdbc.Driver");
        } catch (ClassNotFoundException e) {
            System.out.println("Error loading the driver" + e);
        }
        try {
            //connecting to the database
            Connection conexao = DriverManager.getConnection(dataBaseField.getText());

            //creating a statement and query to be executed
            Statement myStmt = conexao.createStatement();
            ResultSet result = myStmt.executeQuery("select * from Students");

            //look at the result set
            while (result.next()) {
                Student student_ = new Student(result.getInt("id"), result.getString("name"), result.getString("course"), result.getInt("grade"));
                studentList.addNaLista(student_);
                tableView.setItems(getStudent(studentList.getList()));
            }

            myStmt.close();//closing statement
            result.close();//closing results
            conexao.close();//closing connection

        } //if a connection could not be set.
        catch (SQLException exc) {
            alert("CONNECTION ERROR!", "Please verify your connection string.", "String should be in the following format: " + "\n\njdbc:mysql://mymysql.senecacollege.ca/DATABASENAME?user=USERNAME&password=PASSWORD");
        }
    }