编辑JTable行

Question

I use JTable to show users information. I add a edit button that when user select a row and clicked that button, selected row must edit and rewrite to file.

How Should do it?

public class AllUser extends AbstractTableModel {

UserInformation uiS = new UserInformation();
String[] col = {"ID", "Fname", "Lname", "Gender", "Date"};
List<UserInformation> Udata = new ArrayList<UserInformation>();

public AllUser() {
    BufferedReader br = null;
    try {
        FileReader fr = new FileReader("AllUserRecords.txt");
        br = new BufferedReader(fr);
        String line;
        while ((line = br.readLine()) != null) {
            if (line.trim().length() == 0) {
                continue;
            }
            Udata.add(initializeUserInfos(line));
        }
    } catch (IOException e) {
    } finally {
        if (br != null) {
            try {
                br.close();
            } catch (IOException ioe) {
            }
        }
    }
}

private UserInformation initializeUserInfos(String str) {
    UserInformation Uinit = new UserInformation();
    String[] CellArray = str.split("     ");
    Uinit.setID(CellArray[0]);
    Uinit.setFname(CellArray[1]);
    Uinit.setLname(CellArray[2]);
    Uinit.setGender(CellArray[3]);
    Uinit.setDate(CellArray[4]);
    return Uinit;
}

public void RemoveRow(int rowIndex) {
    if (RemoveUserFromFile(rowIndex)) {
        Udata.remove(rowIndex);
        fireTableRowsDeleted(rowIndex, rowIndex);
    } else {
        JOptionPane.showMessageDialog(null, "Unable to delete");
    }
}

public boolean RemoveUserFromFile(int index) {
    File Mf = new File("AllUserRecords.txt");
    File Tf = new File("Uoutput.txt");
    try {
        BufferedReader Ubr = new BufferedReader(new FileReader(Mf));
        PrintWriter Upw = new PrintWriter(new FileWriter(Tf));
        String line;
        while ((line = Ubr.readLine()) != null) {
            if (line.trim().length() == 0) {
                continue;
            }
            if (!line.startsWith(String.valueOf(getValueAt(index, 0)))) {
                Upw.println(line);
            }
        }
        Upw.close();
        Ubr.close();
        Mf.delete();
        Tf.renameTo(Mf);
        return true;
    } catch (FileNotFoundException e1) {
        return false;
    } catch (IOException ioe) {
        return false;
    }
}

public void addRow(UserInformation userinf) {
    if (addUserToFile(userinf.toString())) {
        Udata.add(userinf);
        fireTableRowsInserted(Udata.size() - 1, Udata.size() - 1);
    }
}

public boolean addUserToFile(String useri) {
    try {
        File f = new File("AllUserRecords.txt");
        if (!f.exists()) {
            return false;
        } else {
            FileWriter fw = new FileWriter(f.getAbsoluteFile(), true);
            BufferedWriter bw = new BufferedWriter(fw);
            bw.write(useri);
            bw.close();
            return true;
        }
    } catch (Exception e) {
        return false;
    }
}

@Override
public String getColumnName(int colu) {
    return col[colu];
}

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

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

@Override
public Object getValueAt(int rowIndex, int columnIndex) {
    UserInformation uinfoS = Udata.get(rowIndex);
    Object value = null;
    switch (columnIndex) {
        case 0:
            value = uinfoS.getID();
            break;
        case 1:
            value = uinfoS.getFname();
            break;
        case 2:
            value = uinfoS.getLname();
            break;
        case 3:
            value = uinfoS.getGender();
            break;
        case 4:
            value = uinfoS.getDate();
            break;
        default:
            value = "...";
    }
    return value;
}
}

Second Class:

public class UserPage extends JFrame implements ActionListener {

private AllUser userModel;
private JTable uTable;
JButton addUser;
JButton deleteUser;
JButton mainButton;
JButton exitButton;
JTextField tf1;
JButton searchButton;
JButton editButton;
JLabel resultLbl;
JMenuItem mainpageItem;
JMenuItem exitItem;
JMenuItem bookMenuItem;

public UserPage() {
    setTitle("All User Information");
    userModel = new AllUser();
    uTable = new JTable(userModel);
    createMenus(this);
    add(new JScrollPane(uTable), BorderLayout.CENTER);
    add(buttonPanels(), BorderLayout.PAGE_START);
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    this.setSize(800, 600);
    this.setLocation(300, 60);
    this.setResizable(false);
}

public final JPanel buttonPanels() {
    JPanel buttonsPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
    addUser = new JButton("Add New User");
    deleteUser = new JButton("delete User");
    mainButton = new JButton("Main Page");
    editButton=new JButton("Edit");
    tf1 = new JTextField("              ");
    searchButton = new JButton("Search");
    resultLbl = new JLabel();
    exitButton = new JButton("Exit");

    addUser.addActionListener(this);
    deleteUser.addActionListener(this);
    mainButton.addActionListener(this);
    searchButton.addActionListener(this);
    exitButton.addActionListener(this);
    editButton.addActionListener(this);

    buttonsPanel.add(exitButton);
    buttonsPanel.add(mainButton);
    buttonsPanel.add(editButton);
    buttonsPanel.add(addUser);
    buttonsPanel.add(deleteUser);
    buttonsPanel.add(tf1);
    buttonsPanel.add(searchButton);
    buttonsPanel.add(resultLbl);

    return buttonsPanel;
}

public final void createMenus(JFrame jframe) {
    JMenuBar menuBar = new JMenuBar();
    JMenu Fmenu = new JMenu("File");
    JMenu Bmenu = new JMenu("Book");
    mainpageItem = new JMenuItem("Main Page");
    exitItem = new JMenuItem("Exit");
    bookMenuItem = new JMenuItem("Book Page");

    mainpageItem.addActionListener(this);
    exitItem.addActionListener(this);
    bookMenuItem.addActionListener(this);

    Fmenu.add(mainpageItem);
    Fmenu.add(exitItem);
    Bmenu.add(bookMenuItem);

    menuBar.add(Fmenu);
    menuBar.add(Bmenu);
    jframe.setJMenuBar(menuBar);
}

@Override
public void actionPerformed(ActionEvent e) {

    if(e.getSource()== editButton){
        int selectedRow=uTable.getSelectedRow();
        if(selectedRow>0){
            editUser(selectedRow);

        }
        else{
            JOptionPane.showMessageDialog(null, "Select a user");
        }

    }
}

public boolean searchCondition(String userid) {
    if (userid.trim().isEmpty()) {
        resultLbl.setText("Please Enter User ID");
        return false;
    }
    return true;
}

public void SearchUser(String userEntered) {
    boolean find = false;
    File f = new File("AllUserRecords.txt");
    try {
        FileReader Bfr = new FileReader(f);
        BufferedReader Bbr = new BufferedReader(Bfr);
        String Us;
        while ((Us = Bbr.readLine()) != null) {
            String[] Ust = Us.split("     ");
            String uID = Ust[0];
            String Ufname = Ust[1];
            String Ulname = Ust[2];
            String UGender = Ust[3];
            String Udate = Ust[4];
            if (uID.equals(userEntered.trim())) {
                resultLbl.setText("User Found,"
                        + "    " + Ufname + "  " + Ulname + "  " + UGender + "  " + Udate);
                tf1.setText("              ");
                find = true;
            }
        }
    } catch (FileNotFoundException e) {
        resultLbl.setText("File Not Found");
    } catch (IOException ioe) {
        resultLbl.setText("IO Error");
    } finally {
        tf1.setText("              ");
        if (!find) {
            resultLbl.setText("User Not Found");
            tf1.setText("              ");
        }
    }
}

public static void main(String[] args) {
    new UserPage().setVisible(true);
}

public void editUser(int row){
    new NewUserFrame(UserPage.this).setVisible(true);      

}
}

Answer 1

1. remove all code about FileIO from AbstractTableModel , move that to the separate class, void (clean_up logics),

2. (your AbstractTableModel missing) required to override AbstractTableModel.setValueAt()

3. (your AbstractTableModel missing) required to override AbstractTableModel.isCellEditable()

4. I'b be use DefaultTableModel for this job, not to required to override most of methods required for AbstractTableModel (maybe isCellEditable and getColumnClass ), these methods accesible from JTable and DefaultTableModel side too

5. (your AbstractTableModel) for JTable are accessible only methods that are overridden in AbstractTableModel