Question

我有一个显示文本文件的jtable。文本文件中的每一行都是用户记录。我添加了一个编辑按钮来编辑表格上的每个选定行。我使用这段代码，但我不明白该怎么做：

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("xxx.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;
}
@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;
}

@Override
public void setValueAt(Object value, int rowIndex, int columnIndex) {
    UserInformation userInfo = new UserInformation();

    switch (columnIndex) {

        case 0:
            userInfo.setID((String) value);
            break;
        case 1:
            userInfo.setFname((String) value);
            break;
        case 2:
            userInfo.setLname((String) value);
            break;
        case 3:
            userInfo.setGender((String) value);
            break;
        case 4:
            userInfo.setDate((String) value);
            break;
    }

}

public Object getSelectedMember(int row){
    UserInformation userInf=new UserInformation();

    Object fname=userInf.getFname();
    Object lname=userInf.getLname();
    Object gender=userInf.getGender();
    Object date=userInf.getDate();
    return // ?

}
}

我添加了此getSelectedMember(int row)方法来执行此操作，但不正确！

public class UserPage extends JFrame implements ActionListener {

private AllUser userModel;
private JTable uTable;
private JButton editButton;

public UserPage() {
    userModel = new AllUser();
    uTable = new JTable(userModel);
    add(new JScrollPane(uTable), BorderLayout.CENTER);
    add(buttonPanels(), BorderLayout.PAGE_START);
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    this.setSize(800, 600);
}
public final JPanel buttonPanels() {
    JPanel buttonsPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
    editButton=new JButton("Edit");
    editButton.addActionListener(this);
    buttonsPanel.add(editButton);
    return buttonsPanel;
}
@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 void editUser(int row){
    userModel.getSelectedMember(row);
    new NewUserFrame_Edit().setVisible(true);  
}
}

UserInformation上课：

public class UserInformation {

private String Fname;
private String Lname;
private String ID;
private String Gender;
private String Date;

public String getFname() {
    return Fname;
}

public void setFname(String fname) {
    this.Fname = fname;
}

public String getLname() {
    return Lname;
}

public void setLname(String lname) {
    this.Lname = lname;
}

public String getID() {
    return ID;
}

public void setID(String i_d) {
    this.ID = i_d;
}

public String getGender() {
    return Gender;
}

public void setGender(String gndr) {
    this.Gender = gndr;
}

public String getDate() {
    return Date;
}

public void setDate(String date) {
    this.Date = date;
}

@Override
public String toString() {
    return ID + "     " + Fname + "     "
            + Lname + "     " + Gender + "     " + Date + "\n";
}
}

很抱歉代码很长。

Answer 1

它应该是这样的：当用户点击jtable中的一行并单击时，应打开一个新页面，然后每个旧数据应插入自己的textfiled

将MouseListener添加到表中。
双击即可创建包含编辑数据所需文本字段的JDialog。
然后使用getValueAt（...）方法从表中获取数据。
然后用户在文本字段中编辑数据。
当用户单击对话框中的“保存”按钮时，您将从每个文本字段中获取数据并使用setValueAt（...）方法更新表。
如果要将数据保存在文本文件中，则需要通过写出表中的所有数据来重新创建enitre文件。

Answer 2

在表格中创建一个额外的列，并使用Edit填充单元格值。然后使用适当的Edit呈现TableCellRenderer单元格。将MouseListener添加到表格中。获取在表格中单击的单元格的row和column个数字。如果单击的单元格包含值Edit，请检索该行的每一列的值，并将其显示在包含JTextFields的面板中。使用JOptionpane或在JDialog中显示Panel。以下是完成此任务的简要代码演示：

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.Component;
import java.awt.Color;
import java.awt.Point;
import java.awt.event.MouseListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseAdapter;
import java.awt.Cursor;
import javax.swing.BorderFactory;
import javax.swing.border.BevelBorder;
import javax.swing.JFrame;
import javax.swing.JTable;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.JButton;
import javax.swing.JScrollPane;
import javax.swing.JOptionPane;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;
import javax.swing.event.TableModelListener;
import javax.swing.event.TableModelEvent;
import javax.swing.table.TableModel;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableColumn;
import javax.swing.table.DefaultTableCellRenderer;
class TableRowEdit extends JFrame  
{
    private JTable table;
    private JScrollPane jsPane;
    private TableModel myModel;
    private JPanel dialogPanel;
    private JTextField tf[];
    private JLabel     lbl[];
    public void prepareAndShowGUI()
    {
        myModel = new MyModel();
        table = new JTable(myModel);
        jsPane = new JScrollPane(table);
        table.getColumnModel().getColumn(2).setCellRenderer(new LabelCellRenderer());
        table.addMouseListener(new MyMouseAdapter());
        getContentPane().add(jsPane);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        prepareDialogPanel();
        pack();
        setVisible(true);

    }
    private void prepareDialogPanel()
    {
        dialogPanel = new JPanel();
        int col = table.getColumnCount() - 1;
        dialogPanel.setLayout(new GridLayout(col,2));
        tf = new JTextField[col];
        lbl = new JLabel[col];
        for (int i = 0; i < col; i++)
        {
            lbl[i] = new JLabel(table.getColumnName(i));
            tf[i] = new JTextField(10);
            dialogPanel.add(lbl[i]);
            dialogPanel.add(tf[i]);
        }
    }
    private void populateTextField(String[] s)
    {
        for (int i = 0 ; i < s.length ; i++ )
        {
            tf[i].setText(s[i]);
        }
    }
    public class LabelCellRenderer extends DefaultTableCellRenderer 
    {
        public Component getTableCellRendererComponent(JTable table,Object oValue, boolean isSelected, boolean hasFocus, int row, int column) 
        {
            Component c = super.getTableCellRendererComponent(table, oValue,isSelected, hasFocus,row, column);
            String value = (String)oValue;
            JLabel label =(JLabel)c;
            label.setBorder(BorderFactory.createBevelBorder(BevelBorder.RAISED));
            label.setBackground(Color.lightGray);
            label.setHorizontalTextPosition(SwingUtilities.CENTER);
            label.setHorizontalAlignment(SwingUtilities.CENTER);
            label.setText(value);
            return label;
        }
    }

    private class MyMouseAdapter extends MouseAdapter
    {
        @Override
        public void mousePressed(MouseEvent evt)
        {
            int x = evt.getX();
            int y = evt.getY();
            int row = table.rowAtPoint(new Point(x,y));
            int col = table.columnAtPoint(new Point(x,y));
            if (col == 2)
            {
                String arr[] = new String[table.getColumnCount() - 1];
                for (int i = 0 ; i < arr.length ; i++)
                {
                    arr[i] = (String)table.getValueAt(row,i);
                }
                populateTextField(arr);
                JOptionPane.showMessageDialog(TableRowEdit.this,dialogPanel,"Information",JOptionPane.INFORMATION_MESSAGE);
                //Write here the code to save changed values to file and update to JTable also.
            }
        }
    }
    private class MyModel extends AbstractTableModel 
    {
        String[] columns = {
                            "Roll No.",
                            "Name",
                            "Action"
                            };
        String[][] inData = {
                                {"1","Huge Jackman","Edit"},
                                {"2","Thomas Andrews","Edit"},
                                {"3","Shiney","Edit"}
                            };
        @Override
        public void setValueAt(Object value, int row, int col)
        {
            inData[row][col] = (String)value;
        }
        @Override
        public Object getValueAt(int row, int col)
        {
            return inData[row][col];
        }
        @Override
        public int getColumnCount()
        {
            return columns.length;
        }
        @Override 
        public int getRowCount()
        {
            return inData.length;
        }
        @Override
        public String getColumnName(int col)
        {
            return columns[col];
        }
    }
    public static void main(String st[])
    {
        SwingUtilities.invokeLater( new Runnable()
        {
            @Override
            public void run()
            {
                TableRowEdit td = new TableRowEdit();
                td.prepareAndShowGUI();
            }
        });
    }
}

按jtable编辑用户信息

2 个答案: