这是 MVC 的控制器类：
public class EventController extends MouseAdapter implements ActionListener {
private EventModel model;
private EventView view;
/** Constructor */
public EventController(EventModel myModel, EventView myView){
model = myModel;
view = myView;
}
public void setUpListeners() {
this.view.addEventButton.addActionListener(this);
this.view.addEventMenuItem.addActionListener(this);
this.view.editEventMenuItem.addActionListener(this);
this.view.tableEvent.addMouseListener(this);
}
@Override
public void actionPerformed(ActionEvent e){
Object button = e.getSource();
if(button==this.view.addEventButton) {
setEventDetails();
}
else if (button==this.view.addEventMenuItem) {
this.view.addDialog.setVisible(true);
}
else if(button==this.view.editEventMenuItem) {
this.view.editDialog.setVisible(true);
}
}
/*to change the display of label text of the VIEW according to the selected row of the table tableEvent*/
@Override
public void mouseClicked(java.awt.event.MouseEvent event) {
int rowSelected = view.tableEvent.getSelectedRow();
String tableClick = view.tableEvent.getModel().getValueAt(view.tableEvent.convertRowIndexToModel(rowSelected), 0).toString();
Events e = model.getEvent(tableClick); //tell model to change its state based on user input on views
view.changeDisplay(e);
}
这是 View Class 及其 changeDisplay() 方法来适当地更改标签文本：
public class EventView extends javax.swing.JFrame {
private EventModel model;
public void changeDisplay(Events e) {
evTitle.setText(""+e.getEventName());
evWhen.setText("When: "+ e.getEventDate());
evWhere.setText("Where: "+ e.getEventVenue());
evDescription.setText("Description: "+ e.getEventDetail());
evOpportunity.setText("Opporunity: "+ e.getEventOpportunity());
evMoreDet.setText("More Details: "+ e.getEventMoreDetails());
}
}
这是模型类：
public class EventModel {
Connection conn = JavaConnect.ConnectDB();
PreparedStatement pst = null;
ResultSet rs = null;
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Events e = new Events();
public void addEvent(String name, Date date,String start, String venue, String details,
String opportunity, String more, String end) throws SQLException {
try {
String qry = "INSERT INTO EVENT(eventName,date,time,venue,details,opportunity,moreDetails,endTime) VALUES (?,?,?,?,?,?,?,?)";
pst = conn.prepareStatement(qry);
pst.setString(1, name);
pst.setString(2, sdf.format(date));
pst.setString(3, start);
pst.setString(4, venue);
pst.setString(5, details);
pst.setString(6, opportunity);
pst.setString(7, more);
pst.setString(8, end);
pst.executeUpdate();
}
finally{
try{ pst.close(); }
catch (SQLException se) {}
}
}
public Events getEvent(String tableClick) {
try {
pst = conn.prepareStatement("SELECT * FROM Event WHERE eventID='"+tableClick+"' ");
rs = pst.executeQuery();
while(rs.next()){
e.setEventName(rs.getString(2));
System.out.println(rs.getString(2));
e.setEventDate(rs.getString(3));
e.setEventTime(rs.getString(4));
e.setEventVenue(rs.getString(5));
e.setEventDetail(rs.getString(6));
e.setEventOpportunity(rs.getString(7));
e.setEventMoreDetails(rs.getString(8));
e.setEndTime(rs.getString(9));
rs.close();
pst.close();
}
}
catch(SQLException ex){
ex.printStackTrace();
}
return e;
} //end getEvent
}
我的程序有一个小错误，我似乎无法修复很久。基本上，每当我单击表格 ( tableEvent) 的行时，它应该在表格旁边的标签中显示适当的文本，如屏幕截图所示，事件“软件开发职业事件”。这在第一次执行时工作正常，但是mouseClicked在我通过addEvent模型的方法添加事件后，控制器中的事件方法不会改变文本的显示。我不确定它是什么，是我在实例化类对象时做错了什么Events，我的addEvent方法是错误的，还是控制器中实际mouseClicked覆盖的方法是错误的。会是什么呢？