java - Java swing - 无法显示表格
问题描述
我有一个简单的 MVC 应用程序，我想显示表格。这是我的视图类
public class NaklView {
public JFrame frame;
private JTable table;
/**
* Create the application.
*/
public NaklView(String[][] data, Client client) {
initialize(data,client);
}
private class AreYouSure extends WindowAdapter {
Client client;
public AreYouSure(Client client)
{
this.client = client;
}
public void windowClosing( WindowEvent e ) {
int option = JOptionPane.showOptionDialog(
frame,
"Are you sure you want to quit?",
"Exit Dialog", JOptionPane.YES_NO_OPTION,
JOptionPane.WARNING_MESSAGE, null, null,
null );
if( option == JOptionPane.YES_OPTION ) {
try {
client.getClientBuffWriter().write("QUIT");
client.getClientBuffWriter().flush();
System.out.println("Disconnected.");
System.exit(0);
} catch (Exception ex) {
JOptionPane.showMessageDialog(frame, "Can not disconnect.");
}
}
}
}
/**
* Initialize the contents of the frame.
*/
private void initialize(String[][] data, Client client) {
frame = new JFrame();
frame.setTitle("Nakladatelství");
frame.setBounds(100, 100, 800, 400);
frame.setMinimumSize(new Dimension(500, 300));
frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
frame.addWindowListener(new AreYouSure(client));
JMenuBar menuBar = new JMenuBar();
frame.setJMenuBar(menuBar);
JMenu fileMenu = new JMenu("File");
JMenu importMenu = new JMenu("Add");
JMenuItem addKniha = new JMenuItem("Přidat knihu");
addKniha.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
AddKniha agd = new AddKniha(client);
agd.setVisible(true);
}
});
JMenuItem addNosic = new JMenuItem("Přidat digitální nosič");
addNosic.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
AddDigNosic al = new AddDigNosic(client);
al.setVisible(true);
}
});
JMenuItem addCas = new JMenuItem("Přidat časopis");
addCas.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
AddCasopis el = new AddCasopis(client);
el.setVisible(true);
}
});
JMenuItem addKat = new JMenuItem("Přidat kategorii");
addKat.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
AddKat md = new AddKat(client);
md.setVisible(true);
}
});
JMenuItem addNakl = new JMenuItem("Přidat nakladatelství");
addNakl.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
AddNakl id = new AddNakl(client);
id.setVisible(true);
}
});
JMenuItem addAutor = new JMenuItem("Přidat autora");
addAutor.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
AddAutor ap = new AddAutor(client);
ap.setVisible(true);
}
});
importMenu.add(addKniha);
importMenu.add(addNosic);
importMenu.add(addCas);
importMenu.add(addKat);
importMenu.add(addNakl);
importMenu.add(addAutor);
fileMenu.add(importMenu);
menuBar.add(fileMenu);
GridBagLayout gridBagLayout = new GridBagLayout();
gridBagLayout.columnWidths = new int[]{0, 0, 0};
gridBagLayout.rowHeights = new int[]{0, 0, 0, 0};
gridBagLayout.columnWeights = new double[]{1.0, 0.0, Double.MIN_VALUE};
gridBagLayout.rowWeights = new double[]{0.0, 0.0, 1.0, Double.MIN_VALUE};
frame.getContentPane().setLayout(gridBagLayout);
JButton btnBack = new JButton("Back");
btnBack.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Menu menu = new Menu(client);
frame.dispose();
menu.frame.setVisible(true);
}
});
GridBagConstraints gbc_btnBack = new GridBagConstraints();
gbc_btnBack.anchor = GridBagConstraints.EAST;
gbc_btnBack.insets = new Insets(0, 0, 5, 5);
gbc_btnBack.gridx = 0;
gbc_btnBack.gridy = 0;
frame.getContentPane().add(btnBack, gbc_btnBack);
JButton btnRefresh = new JButton("Refresh");
btnRefresh.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Menu m = new Menu(client);
frame.dispose();
m.getKnihy(client);
}
});
GridBagConstraints gbc_btnRefresh = new GridBagConstraints();
gbc_btnRefresh.anchor = GridBagConstraints.EAST;
gbc_btnRefresh.insets = new Insets(0, 0, 5, 5);
gbc_btnRefresh.gridx = 1;
gbc_btnRefresh.gridy = 0;
frame.getContentPane().add(btnRefresh, gbc_btnRefresh);
JButton btnAddNakl = new JButton("Přidat nakladatelství");
btnAddNakl.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
AddNakl dialog = new AddNakl(client);
dialog.setVisible(true);
if(!dialog.isVisible())
{
Menu m = new Menu(client);
m.getNakladatelstvi(client);
frame.dispose();
}
}
});
GridBagConstraints gbc_btnAddEmployee = new GridBagConstraints();
gbc_btnAddEmployee.anchor = GridBagConstraints.EAST;
gbc_btnAddEmployee.insets = new Insets(0, 0, 5, 0);
gbc_btnAddEmployee.gridx = 2;
gbc_btnAddEmployee.gridy = 0;
frame.getContentPane().add(btnAddNakl, gbc_btnAddEmployee);
JSeparator separator = new JSeparator();
GridBagConstraints gbc_separator = new GridBagConstraints();
gbc_separator.fill = GridBagConstraints.HORIZONTAL;
gbc_separator.gridwidth = 3;
gbc_separator.insets = new Insets(0, 0, 5, 5);
gbc_separator.gridx = 0;
gbc_separator.gridy = 1;
frame.getContentPane().add(separator, gbc_separator);
JScrollPane scrollPane = new JScrollPane();
GridBagConstraints gbc_scrollPane = new GridBagConstraints();
gbc_scrollPane.gridwidth = 3;
gbc_scrollPane.fill = GridBagConstraints.BOTH;
gbc_scrollPane.gridx = 0;
gbc_scrollPane.gridy = 2;
frame.getContentPane().add(scrollPane, gbc_scrollPane);
Object rowData[][] = data;
Object columnNames[] = { "IČO", "Název"};
JTable table = new JTable(rowData, columnNames) {
public boolean editCellAt(int row, int column, java.util.EventObject e) {
return false;
}
};
table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
scrollPane.setViewportView(table);
table.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
if (e.getClickCount() == 2) {
JTable target = (JTable) e.getSource();
int row = target.getSelectedRow();
String[] data = new String[2];
data[0] = rowData[row][0].toString();
data[1] = rowData[row][1].toString();
EditNakl ee = new EditNakl(client,data);
ee.setVisible(true);
}
}
});
scrollPane.setViewportView(table);
}
这是我的菜单类（程序方向的默认菜单）
public void getNakladatelstvi(Client client)
{
String data ="";
try {
client.getClientBuffWriter().write("READALL;NAKL\r\n");
client.getClientBuffWriter().flush();
data = client.getClientBuffReader().readLine();
Formater f = new Formater();
String[][] content = null;
if(data.contains(";"))
{
content = f.parseBySemicolon(f.parseByBackslash(data), 5);
NaklView iw = new NaklView(content,client);
frame.dispose();
iw.frame.setVisible(true);
}
else
{
throw new Exception();
}
}
catch (Exception ex)
{
JOptionPane.showMessageDialog(frame, data);
}
}
这是我的控制器类（只有 readall 方法）
@Override
public String readall(String[] data) {
String result = "";
try
{
System.out.println(this.getEm().hashCode());
this.getEm().clear();
this.getEm().getTransaction().begin();
Query query = this.getEm().createQuery("SELECT n FROM Nakladatelstvi n");
List<Nakladatelstvi> ems = query.getResultList();
this.getEm().getTransaction().commit();
if(!ems.isEmpty())
{
for (Nakladatelstvi n : ems)
{
result += n.toString() + "/";
}
}
else
result = "No nakladatestvi in database!";
}
catch (Exception ex)
{
result = "Can not proceed transaction.";
}
return result;
}
我只想从数据库中查看表。如果我运行程序并单击“Nakladatelstvi”按钮，则会显示以下内容 - https://drive.google.com/open?id=0B859nptdnI1Vbkd5UlFWVy1pckE
我会很高兴每一个建议！谢谢你。
解决方案
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