在这种情况下如何使用fireTableDataChanged？ （或者我应该使用其他什么方法？）

Question

我正在制作一个小程序，它从sqlite数据库中检索数据并填充JTable。用户还可以通过适当的表单填充数据库。问题是，如何更新JTable以显示用户添加的内容？目前，它仅在重新运行整个应用程序后显示它。

这是表格的代码：

package kpkw;


import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ScrollPaneConstants;
import javax.swing.SwingUtilities;
import static javax.swing.WindowConstants.EXIT_ON_CLOSE;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumnModel;


public class MainTable {



//protected List<List<Object>> allMembers = new ArrayList<>();
//protected List<Object> member = new ArrayList<>();
protected MainTable(){

}


private  void PassFromDBtoTable(List<List<Object>> allMembers){


        Connection c = null;
        Statement stmt = null;
        ResultSet rs = null;
        try {
          c = DriverManager.getConnection("jdbc:sqlite:HistoriaPrzeplywow.s3db");
          c.setAutoCommit(false);
          stmt = c.createStatement();
          rs = stmt.executeQuery( "SELECT * FROM HistoriaPrzeplywow;" );
          while ( rs.next() ) {
              List<Object> member = new ArrayList();

             int idSQL = rs.getInt("ID");
             String id2SQL = rs.getString("ID2");
             int id3SQL = rs.getInt("ID3");
             String typSQL = rs.getString("Typ");
             String imieSQL = rs.getString("Imie");
             String nazwiskoSQL = rs.getString("Nazwisko");
             int naleznoscSQL = rs.getInt("Naleznosc");
             String tytulemSQL = rs.getString("Tytulem");
             String dataSQL = rs.getString("Data");

             member.add(idSQL);
             member.add(id2SQL);
             member.add(id3SQL);
             member.add(typSQL);
             member.add(imieSQL);
             member.add(nazwiskoSQL);
             member.add(ManageCurrency(naleznoscSQL));
             member.add(tytulemSQL);
             member.add(dataSQL);

             allMembers.add(member);

          }

        } 
          catch ( SQLException e ) {
          System.err.println( e.getClass().getName() + ": " + e.getMessage() );
          System.exit(0);
        }

        finally{
          if(rs!=null&& stmt!=null && c!=null){
            try{
                rs.close();
                stmt.close();
                c.close();
            }
            catch(SQLException e){
                e.printStackTrace();
            }
          }
        }       
}



private String ManageCurrency(int naleznoscSQL){
    String currency = Integer.toString(naleznoscSQL);
    currency = new StringBuilder(currency).insert(currency.length()-2, ".").toString();

    return currency;

}

private void ResizeColumnWidth(JTable table){
    final TableColumnModel columnModel = table.getColumnModel();
    for(int col = 0; col < table.getColumnCount(); col++){
        int width = 70;
        for(int row = 0; row < table.getRowCount(); row++){
            TableCellRenderer renderer = table.getCellRenderer(row, col);
            Component component = table.prepareRenderer(renderer, row, col);
            int componentSize = component.getPreferredSize().width;
            width = Math.max(componentSize ,width);
        }
        columnModel.getColumn(col).setPreferredWidth(width);
    }
}  // method doesn't work so far




private void initUI(){




    JFrame mainFrame = new JFrame();

    JPanel mainPanel = new JPanel();

    JMenuBar menuBar = new JMenuBar();

    JMenu plikMenu = new JMenu("Plik");


    List<List<Object>> allMembers = new ArrayList<>();
    List<Object> member = new ArrayList<>();
    PassFromDBtoTable(allMembers);
    for(int i = 0; i< member.size(); i++){
        System.out.println(member.get(i));
    }
    MyTableModel mtb = new MyTableModel(allMembers);
    JTable rekordy = new JTable(mtb);
    JScrollPane scrollPane = new JScrollPane(rekordy);
    ResizeColumnWidth(rekordy);
    rekordy.setAutoResizeMode( JTable.AUTO_RESIZE_OFF );
    rekordy.setAutoCreateRowSorter(true);

    JMenuItem noweKPMenuItem = new JMenuItem("Nowe KP...");
    JMenuItem noweKWMenuItem = new JMenuItem("Nowe KW...");
    JMenuItem zakonczMenuItem = new JMenuItem("Zakończ");





    mainFrame.setLayout(new BorderLayout());
    mainFrame.setTitle("Historia Przepływów");
    mainFrame.setLocationRelativeTo(null);
    mainFrame.setDefaultCloseOperation(EXIT_ON_CLOSE);
    mainFrame.setSize(660, 200);
    mainFrame.setJMenuBar(menuBar);

    //JButton test = new JButton("test");

    //mainFrame.add(mainPanel);

    mainPanel.setLayout(new BorderLayout());

    scrollPane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED);

    mainPanel.add(scrollPane, BorderLayout.CENTER);
    //mainPanel.add(test);
    menuBar.add(plikMenu);
    plikMenu.add(noweKPMenuItem);
    plikMenu.add(noweKWMenuItem);
    plikMenu.add(zakonczMenuItem);
    mainFrame.add(scrollPane, BorderLayout.CENTER);
    mainFrame.setVisible(true);

       noweKPMenuItem.addActionListener(new ActionListener() {
       @Override
       public void actionPerformed(ActionEvent event) {
           //KP run = new KP();
           KP.run();
      }
   });

}



public class MyTableModel extends AbstractTableModel{



    protected List<List<Object>> allMembers = new ArrayList<>();

     public MyTableModel (List<List<Object>> allMembers) {
    this.allMembers = allMembers;
}

     protected MyTableModel(){

     }


    String[] columnNames = {"ID", "ID2", "ID3", "Typ", "Imię", "Nazwisko","Należność", "Tytułem", "Data"};


    @Override
    public String getColumnName(int column) {
        return columnNames[column];
    }  

    @Override
    public int getRowCount() {
        return allMembers.size();
    }

    @Override
    public int getColumnCount() {
        return columnNames.length;
    }

    @Override
    public Object getValueAt(int rowIndex, int columnIndex) {
        //List<Object> row = allMembers.get(rowIndex);
        return allMembers.get(rowIndex).get(columnIndex);

    }

    @Override
    public boolean isCellEditable(int row, int column)
    {
      return false;
    }




    protected  void addRecord(int ID, String ID2, int ID3, String typ, String imie, String nazwisko, int naleznosc, String tytulem, String data){
    Connection c = null;
    PreparedStatement pstmt = null;
    try {
        Class.forName("org.sqlite.JDBC");
        c = DriverManager.getConnection("jdbc:sqlite:HistoriaPrzeplywow.s3db");
        c.setAutoCommit(false);
        System.out.println("Opened database successfully");

        //pstmt = c.createStatement();
        String sqlCommand = ("INSERT INTO HistoriaPrzeplywow (ID,ID2,ID3,Typ,Imie,Nazwisko,Naleznosc,Tytulem,Data) VALUES (?,?,?,?,?,?,?,?,?);");
        pstmt = c.prepareStatement(sqlCommand);
        pstmt.setInt(1, ID);
        pstmt.setString(2, ID2);
        pstmt.setInt(3, ID3);
        pstmt.setString(4, typ);
        pstmt.setString(5, imie);
        pstmt.setString(6, nazwisko);
        pstmt.setInt(7, naleznosc);
        pstmt.setString(8, tytulem);
        pstmt.setString(9, data);

        pstmt.executeUpdate();
        c.commit();

        List<Object> rowData = new ArrayList<>();
        rowData.add(ID);
        rowData.add(ID2);
        rowData.add(ID3);
        rowData.add(typ);
        rowData.add(imie);
        rowData.add(nazwisko);
        rowData.add(tytulem);
        rowData.add(data);

        allMembers.add(rowData);
        fireTableDataChanged();







    }
    catch(SQLException| ClassNotFoundException e){
        e.printStackTrace();
    }
    finally{
        if(c!=null){
            try{
                c.close();
               // pstmt.close();
            }
            catch(SQLException e){
                e.printStackTrace();
            }
        }
    }
}


} 



 /*MainTable(){

    initUI();

}*/

public static void main(String args[]) {

    SwingUtilities.invokeLater(new Runnable() {
        @Override
        public void run() {
            //System.out.println(new File(".").getAbsoluteFile());



            MainTable guiMainTable = new MainTable();
            guiMainTable.initUI();


                        }
    });
}
}

这是表格的代码：

package kpkw;

import java.awt.Component;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import static javax.swing.JFrame.EXIT_ON_CLOSE;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JSeparator;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
import javax.swing.SwingUtilities;


public class KP extends JFrame {
private ArrayList<JPanel> naleznosciArrayList   = new ArrayList<>();
private ArrayList<JTextField> zaCoArrayList   = new ArrayList<>();
private ArrayList<JTextField> zloteArrayList   = new ArrayList<>();
private ArrayList<JTextField> grArrayList   = new ArrayList<>();
private static int liczbaWierszy = -1;



public KP() {

    initUI();
}



private void usunPole(JPanel nal){
    nal.remove(naleznosciArrayList.get(liczbaWierszy));
    naleznosciArrayList.remove(liczbaWierszy);
    liczbaWierszy--;
}

private void initUI(){

   setTitle("KP");
   setSize(500, 300);
   setLocationRelativeTo(null);
   setDefaultCloseOperation(DISPOSE_ON_CLOSE);
   JMenuBar menubar = new JMenuBar();
   this.setJMenuBar(menubar);
   JMenu plik = new JMenu("Plik");
   menubar.add(plik);


   JPanel container = new JPanel();
   container.setLayout(new BoxLayout(container, BoxLayout.Y_AXIS));
   this.add(container);

   JPanel title = new JPanel();
   JLabel kpTytul = new JLabel("Generator KP");
   kpTytul.setFont(new Font("Serif",Font.BOLD, 14));

   container.add(title);
   title.add(kpTytul);

   JPanel pola1 = new JPanel();
   pola1.setLayout(new GridLayout(2,2));
   container.add(pola1);

   JLabel lData = new JLabel("  Data");
   JTextField tData = new JTextField(1);
   tData.setEditable(false);
   DateFormat dateFormat = new SimpleDateFormat("dd-MM-yyyy");
   Date date = new Date();
   tData.setText((dateFormat.format(date)));
   JLabel lNumer = new JLabel("  KP");

   JPanel numery = new JPanel();
   numery.setLayout(new BoxLayout(numery, BoxLayout.X_AXIS));
   JTextField tNumerRef = new JTextField(1);
   tNumerRef.setEditable(false);
   Connection c = null;
    Statement stmt = null;
    ResultSet rs = null;
    try {
      c = DriverManager.getConnection("jdbc:sqlite:HistoriaPrzeplywow.s3db");
      c.setAutoCommit(false);
      stmt = c.createStatement();
      rs = stmt.executeQuery( "SELECT Count(*) FROM HistoriaPrzeplywow;" );
      rs.next();
      int numberOfRows = rs.getInt(1)+1;
      tNumerRef.setText(Integer.toString(numberOfRows));
    }
    catch(SQLException e){
        e.printStackTrace();
    }
    finally{
        if(c!=null&&rs!=null){
            try{
                c.close();
                //stmt.close();
                rs.close();
            }
            catch(SQLException e){
                e.printStackTrace();
            }
        }
    }
   JTextField tNumerReg = new JTextField(1);
   JTextField tNumerRok = new JTextField(1);
   DateFormat rokFormat = new SimpleDateFormat("yyyy");
   Date dataRok = new Date();
   tNumerRok.setText((rokFormat.format(dataRok)));
   tNumerRok.setEditable(false);

   numery.add(tNumerRef);
   numery.add(tNumerReg);
   numery.add(tNumerRok);

   pola1.add(lData);
   pola1.add(tData);
   pola1.add(lNumer);
   pola1.add(numery);

   JPanel pola2 = new JPanel();
   pola2.setLayout(new GridLayout(3,2));
   container.add(pola2);

   JLabel lImie = new JLabel("  Imię");
   JTextField tImie = new JTextField(1);
   JLabel lNazwisko = new JLabel("  Nazwisko");
   JTextField tNazwisko = new JTextField(1);
   //JLabel lZaCo = new JLabel("Za co");
   //JTextField tZaCo = new JTextField(1);

   pola2.add(lImie);
   pola2.add(tImie);
   pola2.add(lNazwisko);
   pola2.add(tNazwisko);

   JPanel naleznosci = new JPanel();
    naleznosci.setLayout(new BoxLayout(naleznosci, BoxLayout.X_AXIS));

    JLabel lZaCo = new JLabel("Tytułem:");
    JTextField tZaCo = new JTextField(1);
    zaCoArrayList.add(tZaCo);
    JLabel gap = new JLabel("       ");
    JLabel lKasa = new JLabel("Wartość:");
    JTextField tZlote = new JTextField(1);
    zloteArrayList.add(tZlote);
    JLabel lZl = new JLabel("zł");
    JTextField tGr = new JTextField(1);
    grArrayList.add(tGr);
    JLabel lGr = new JLabel("gr");
    JLabel gap2 = new JLabel("   ");
    JLabel gap3 = new JLabel("   ");
    //JLabel lWinien = new JLabel("Winien");
    //JTextField tWinien = new JTextField(1);

    naleznosci.add(lZaCo);
    naleznosci.add(tZaCo);
    naleznosci.add(gap);
    naleznosci.add(lKasa);
    naleznosci.add(gap3);
    naleznosci.add(tZlote);
    naleznosci.add(lZl);
    naleznosci.add(tGr);
    naleznosci.add(lGr);

    container.add(naleznosci);


   JPanel separator = new JPanel();
   container.add(separator);
   separator.add(new JSeparator(SwingConstants.HORIZONTAL));

   JButton generuj = new JButton("Generuj");
   container.add(generuj);
   generuj.setAlignmentX(Component.LEFT_ALIGNMENT);

   generuj.addActionListener(new ActionListener() {
       @Override
       public void actionPerformed(ActionEvent event) {

           if(tImie.getText().equals("") || tNazwisko.getText().equals("") || tNumerReg.getText().equals("") || tZaCo.getText().equals("") || tZlote.getText().equals("") || tGr.getText().equals("")){
               //System.out.println("Nie wypełniono wszystkich pól");
               ErrorWindow.setMessage("<html><center>Nie wypełniono wszystkich pól</center></html>");
               ErrorWindow.main();
           }
           else {

               try{
                   int ID = Integer.parseInt(tNumerRef.getText());
                   int ID3 = Integer.parseInt(tNumerRok.getText());
                   String typ = "KP";
                   String naleznosc = tZlote.getText() + tGr.getText();
                   int naleznoscInt = Integer.parseInt(naleznosc);
                   MainTable mt = new MainTable();
                   mt.new MyTableModel().addRecord(ID, tNumerReg.getText(), ID3, typ, tImie.getText(), tNazwisko.getText(), naleznoscInt, tZaCo.getText(), tData.getText());


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




           }
      }
   });










}

public static void run() {

    SwingUtilities.invokeLater(new Runnable() {
        @Override
        public void run() {
            KP gui = new KP();
            gui.setVisible(true);
        }
    });
}

}

任何帮助将不胜感激。

Answer 1

MainTable mt = new MainTable();
mt.new MyTableModel().addRecord(...);

不要创建新的JTable。您需要访问框架中显示的JTable的现有TableModel。然后在该表模型上调用addRecord（...）方法。

同样在您使用的自定义TableModel中：

fireTableDataChanged();

这是错误的方法，因为您没有更改所有数据。你所做的就是添加一行数据，所以你应该使用：

fireTableRowsInserted(...);