編輯JTable行

Question

我使用JTable來顯示用戶信息。 我添加了一個編輯按鈕，當用戶選擇一行並單擊該按鈕時，所選行必須編輯並重寫到文件。

應該怎麼做？

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; 
} 
} 

二等：

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. 刪除所有代碼AbstractTableModel約FileIO，將其移至單獨的類，無效（CLEAN_UP邏輯），

2. （您AbstractTableModel上的缺失）需要覆蓋AbstractTableModel.setValueAt()

3. 覆蓋AbstractTableModel.isCellEditable()

4. I'b對這項工作使用DefaultTableModel，需要（您AbstractTableModel上的缺失）不覆蓋大部分爲AbstractTableModel（也許isCellEditable和getColumnClass）所需的方法和要求，這些方法從JTable入店和DefaultTableModel方太

5. （您AbstractTableModel上）爲JTable是在AbstractTableModel

覆蓋只能訪問方法