我JTable用来显示用户信息。我添加了一个编辑按钮，当用户选择一行并单击该按钮时，所选行必须编辑并重写到文件。
应该怎么做？
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);
}
}