Question

我有JTable，通过我的数据库

连接

我正在通过调用此方法初始化我的表，

private void initializeRecordsPanel(){
    disableAllPanels();        
    lblCityJail = new JLabel("Meycauayan City Jail\r\n");
    lblCityJail.setBounds(244, 11, 283, 50);
    lblCityJail.setForeground(Color.BLACK);
    lblCityJail.setFont(new Font("Tahoma", Font.BOLD, 25));
    recordsPanel.add(lblCityJail);

    btnRefresh.setVisible(true);
    try{
        connection ();                

        String columns [] = {
                "Last Name", "First Name", "Alias", "Sex", "Case1", "Case2"
        };
        int count = 0 ;

        while(rs.next()){
            count ++;
        }

        String datas[][] = new String [count] [7] ;

        int i=0;

        connection();
        while(rs.next()){
            datas[i][0]=rs.getString("lname").toString();
            datas[i][1]=rs.getString("fname").toString();
            datas[i][2]=rs.getString("alias").toString();
            datas[i][3]=rs.getString("sex").toString();
            datas[i][4]=rs.getString("case1").toString();
            datas[i][5]=rs.getString("case2").toString();
            datas[i][6]=rs.getString("ID").toString();
            i++;
        }


        scrollPane_1 = new JScrollPane();

        scrollPane_1.setBounds(48, 104, 650, 314);
        recordsPanel.add(scrollPane_1);

        tblListOfInmates = new JTable(datas, columns){
            public boolean isCellEditable(int nRow, int nCol) {
                return false;
            }
        };

        //TableRowSorter<TableModel> sorter = new TableRowSorter<TableModel>(tblListOfInmates.getModel());
        //tblListOfInmates.setRowSorter(sorter);

        tblListOfInmates.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent e) {
                try{
                    int row = tblListOfInmates.getSelectedRow();
                    Table_click = tblListOfInmates.getModel().getValueAt(row, 6).toString();


                    if(rs.next()){
                        addRecord ar = new addRecord();
                        ar.connection();
                        ar.setupFrame();
                        ar.setSelectedRowToTextFields();
                        ar.edit.setVisible(false);
                        ar.save.setVisible(false);
                        ar.btnEdit.setVisible(true);                            
                        ar.setTextFieldsEditable(false);

                        mainframe.setEnabled(false);
                        ar.addWindowListener(new WindowAdapter() {
                               public void windowClosing(WindowEvent we) {
                                  dispose();
                                  MainFrame.mainframe.setEnabled(true);
                               }
                            });
                        st.close();
                        connection();
                        }

                }catch(Exception e1){e1.printStackTrace();}
            }
            @Override
            public void mouseEntered(MouseEvent e) {
                tblListOfInmates.setCursor(new Cursor(Cursor.HAND_CURSOR));
            }
            @Override
            public void mouseExited(MouseEvent e) {
                tblListOfInmates.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
            }

        });
        scrollPane_1.setViewportView(tblListOfInmates);

        JLabel lblSelectToView = new JLabel("* Select to view full record");
        lblSelectToView.setBounds(47, 74, 171, 14);
        recordsPanel.add(lblSelectToView);



        st.close();
        connection();
    }catch(Exception e){e.printStackTrace();}


    recordsPanel.setVisible(true);
}

当我点击一行时，会弹出一个框架并包含我选择的数据。然后我用这段代码更新表：

try{
    connection();

    String columns [] = {
            "Last Name", "First Name", "Alias", "Sex", "Case1", "Case2"
    };
    int count = 0 ;

    while(rs.next()){
        count ++;
    }

    String datas[][] = new String [count] [7] ;

    int i=0;

    connection();
    while(rs.next()){
            datas[i][0]=rs.getString("lname").toString();
            datas[i][1]=rs.getString("fname").toString();
            datas[i][2]=rs.getString("alias").toString();
            datas[i][3]=rs.getString("sex").toString();
            datas[i][4]=rs.getString("case1").toString();
            datas[i][5]=rs.getString("case2").toString();
            datas[i][6]=rs.getString("ID").toString();
            i++;
    }

    scrollPane_1 = new JScrollPane();

    scrollPane_1.setBounds(48, 104, 650, 314);
    recordsPanel.add(scrollPane_1);



    tblListOfInmates = new JTable(datas, columns){
        public boolean isCellEditable(int nRow, int nCol) {
            return false;
        }
    };
    scrollPane_1.setViewportView(tblListOfInmates);

}catch(Exception e){e.printStackTrace();}

表格已成功更新，但当我再次点击某一行时，它会给我这个错误：

java.lang.ArrayIndexOutOfBoundsException: -1
    at javax.swing.JTable$1.getValueAt(Unknown Source)
    at RecordManagementSystem.MainFrame$16.mouseClicked(MainFrame.java:805)
    at java.awt.AWTEventMulticaster.mouseClicked(Unknown Source)
    at java.awt.Component.processMouseEvent(Unknown Source)
    at javax.swing.JComponent.processMouseEvent(Unknown Source)
    at java.awt.Component.processEvent(Unknown Source)
    at java.awt.Container.processEvent(Unknown Source)
    at java.awt.Component.dispatchEventImpl(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Window.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
    at java.awt.EventQueue.access$200(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue$4.run(Unknown Source)
    at java.awt.EventQueue$4.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue.dispatchEvent(Unknown Source)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.run(Unknown Source)

在这一行：

Table_click = tblListOfInmates.getModel().getValueAt(row, 6).toString();

Answer 1

你正在做的事情有几个问题......

加载数据时，你会......

scrollPane_1 = new JScrollPane();

scrollPane_1.setBounds(48, 104, 650, 314);
recordsPanel.add(scrollPane_1);

tblListOfInmates = new JTable(datas, columns){
    public boolean isCellEditable(int nRow, int nCol) {
        return false;
    }
};
//...
scrollPane_1.setViewportView(tblListOfInmates);

当你更新表格时，你就这样做了......

scrollPane_1 = new JScrollPane();

scrollPane_1.setBounds(48, 104, 650, 314);
recordsPanel.add(scrollPane_1);

tblListOfInmates = new JTable(datas, columns){
    public boolean isCellEditable(int nRow, int nCol) {
        return false;
    }
};
scrollPane_1.setViewportView(tblListOfInmates);

第一个问题是，你没有删除上一个表，因此你现在将组件叠加在一起，这意味着你不知道你实际上在与哪个表进行交互。

下一个问题是，你不需要做所有这些。只需创建JTable，将其应用于JScrollPane并将其添加到您需要的容器中。

加载数据时，为数据库中的数据创建一个新的TableModel，并将其设置为先前创建的JTable模型...

TableModel model = ...;
//...
tblListOfInmates.setModel(model);

这是Model-View-Control pattern

的原则

此：

tblListOfInmates = new JTable(datas, columns){
    public boolean isCellEditable(int nRow, int nCol) {
        return false;
    }
};

一个坏主意，TableModel应该控制可以编辑和不编辑的内容。

请查看How to Use Tables和Creating a Table Model了解详情

您还应该使用appropriate layout manager，因为您无法控制可能在不同系统上使用的屏幕分辨率，DPI，渲染管道或字体，所有这些都将使您的像素完美布局并转向变成垃圾......

如果您创建了从数据库中提取的数据的POJO表示，而不是依赖于2D数组，您可能会发现它更容易，但那只是我......

你MouseListener也让我担心......

tblListOfInmates.addMouseListener(new MouseAdapter() {
    @Override
    public void mouseClicked(MouseEvent e) {
        try{
            int row = tblListOfInmates.getSelectedRow();
            Table_click = tblListOfInmates.getModel().getValueAt(row, 6).toString();

            if(rs.next()){

执行if语句时，您已经移动到结果集的末尾...

Answer 2

假设您使用的是DefaultTableModel，那么您只需：

model.setRowCount(0);

如何在添加，删除和更新数据时刷新JTable

2 个答案: