getSelectedRow方法保持返回行0

Question

我嘗試從jTable中選擇一行並將值存儲到topicId中。這是我的代碼。

jTable.addMouseListener(new java.awt.event.MouseAdapter() { 
      public void mouseClicked(java.awt.event.MouseEvent e) { 
      if (jTable.getSelectedRow() >= 0 && jTable.getValueAt(jTable.getSelectedRow(), 0) != null) { 
        topicId = (Integer)jTable.getValueAt(jTable.getSelectedRow(), 0);} 

      System.out.println(topicId); 
       eForumTopics topics = new eForumTopics(topicId); 
       topics.retrieveThread(); 
       getJFrame().dispose(); 
       eForumThreadContent myWindow = new eForumThreadContent(topicId); 
       myWindow.getJFrame().setVisible(true); 
      } 
     }); 
    } 

這是我的滾動窗格的代碼。

private JScrollPane getJScrollPane() { 
    if (jScrollPane == null) { 
     jScrollPane = new JScrollPane(); 
     jScrollPane.setBounds(new Rectangle(75, 220, 800, 450)); 
     jScrollPane.setViewportView(getJTable()); 
    } 
    return jScrollPane; 
} 

這裏是jTable的代碼。

private JTable getJTable() { 
    if (jTable == null) { 
     Vector columnNames = new Vector(); // Vector class allows dynamic 
              // array of objects 
     Vector data = new Vector(); 
     try { 
      DBController db = new DBController(); 
      db.setUp("IT Innovation Project"); 
      Class.forName("sun.jdbc.odbc.JdbcOdbcDriver").newInstance(); 
      String dsn = "IT Innovation Project"; 
      String s = "jdbc:odbc:" + dsn; 
      Connection con = DriverManager.getConnection(s, "", ""); 
      String sql = "Select topic_title,topic_description,topic_by from forumTopics WHERE topic_category = '"+category+"'"; 
      java.sql.Statement statement = con.createStatement(); 
      ResultSet resultSet = statement.executeQuery(sql); 
      ResultSetMetaData metaData = resultSet.getMetaData(); 
      int columns = metaData.getColumnCount(); 
      for (int i = 1; i <= columns; i++) { 
       columnNames.addElement(metaData.getColumnName(i)); 
      } 
      while (resultSet.next()) { 
       Vector row = new Vector(columns); 
       for (int i = 1; i <= columns; i++) { 
        row.addElement(resultSet.getObject(i)); 
       } 
       data.addElement(row); 
      } 
      resultSet.close(); 
      ((Connection) statement).close(); 
     } catch (Exception e) { 
      System.out.println(e); 
     } 
     jTable = new JTable(data, columnNames); 
     TableColumn column; 
     for (int i = 0; i < jTable.getColumnCount(); i++) { 
      column = jTable.getColumnModel().getColumn(i); 
      if (i == 1) { 
       column.setPreferredWidth(400); // second column is bigger 
      }else { 
       column.setPreferredWidth(200); 
      } 
     } 
     String header[] = { "Title", "Description", "Posted by" }; 

     for (int i = 0; i < jTable.getColumnCount(); i++) { 
      TableColumn column1 = jTable.getTableHeader().getColumnModel() 
        .getColumn(i); 

      column1.setHeaderValue(header[i]); 
     } 
     jTable.getTableHeader().setFont(new Font("Dialog" , Font.PLAIN, 20)); 
     jTable.getTableHeader().setForeground(Color.white); 
     jTable.getTableHeader().setBackground(new Color(102, 102, 102)); 
     jTable.setEnabled(false); 
     jTable.setRowHeight(100); 
     jTable.getRowHeight(); 
     jTable.setFont(new Font("Dialog" , Font.PLAIN, 18)); 
     jTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF); 

我不知道我的表格或滾動窗格是否有問題。無論何時我在jTable中選擇了任何行，例如4或5或6，結果都會讓我返回0行。有人可以提供幫助嗎？提前致謝。

Answer 1

添加鼠標偵聽器將所選行存儲在字段中沒有任何意義。該表知道其選定的行，而且，選擇可以在不使用鼠標的情況下改變。

如果你想要做的事（如選擇行的加載細節），每次選擇更改，然後添加一個選擇偵聽器：

table.getSelectionModel().addListSelectionListener(new ListSelectionListener() { 
    @Override 
    public void valueChanged(ListSelectionEvent e) { 
     if (!e.getValueIsAdjusting()) { 
      int viewRow = table.getSelectedRow(); 
      if (viewRow >= 0) { 
       int modelRow = table.convertRowIndexToModel(); 
       Integer topicId = tableModel.getTopicIdAtRow(modelRow); 
       // todo load the details for topicId 
      } 
     } 
    } 
});