使用自定義TableModel和從文件讀取的項目列表時，如何更新jtable

Question

我有我的Jtable / TableModel的問題，無論我嘗試了多少，我似乎都無法修復。 我正在開發一個通訊錄程序，沒有數據庫程序，因為我們的教授希望我們手動學習所有內容，所以我擁有的是一個.csv文件，我可以用它讀取/寫入聯系人。 我讀取文件中的聯系人，將其放在列表中，使用該列表在其周圍形成一個TableModel，然后使用該TableModel制作一個Jtable。 我的問題浮出水面，當我在文件上寫新聯系人時，除非我關閉程序並重新啟動，否則jtable不會使用新信息來更新自身。 我如何能夠使表使用新信息進行自身更新？

這是我第一次制作jtable和table模型的地方，因為它不相關，所以不會發布整個方法。

List<Contatcs> listContacts = createListContacts(username);
tableModel = new TableModel(listContacts);

//create table, sorter and set single selection model
jTable = new JTable(tableModel);
final TableRowSorter<TableModel> sorter = new TableRowSorter<TableModel>(tableModel);
JTableHeader jtHeader = jTable.getTableHeader();

這是我創建聯系人列表的地方

public static List<Contatcs> createListContacts(String username) throws FileNotFoundException{

        String file = "CustomersAddressBooks\\" + username + ".csv";
        Scanner fileReader = new Scanner(new File(file));
        List<Contatcs> retVal = new ArrayList();
        while (fileReader.hasNextLine()){
            String line = fileReader.nextLine();
            line = line.replaceAll("\r||\n","");
            String[] var = line.split(",");
            if(!line.equals("") && !var[0].equals("FirstName") && !var[1].equals("LastName")){

                retVal.add(new Contatcs(var[0],var[1],var[2],var[3],var[4],var[5],var[6],var[7],var[8]));
            }
        }

        fileReader.close();

        return retVal;
    }

這是我的TableModel類

public class TableModel extends AbstractTableModel {
    private static final int COLUMN_FIRSTNAME = 0;
    private static final int COLUMN_LASTNAME = 1;
    private static final int COLUMN_PHONENUMBER = 2;
    private static final int COLUMN_CITY = 3;

    private String[] columnNames = {"First Name", "Last Name", "Phone Number", "City"};
    private List<Contatcs> listContacts;

    public TableModel(List<Contatcs> listContacts){
        this.listContacts = listContacts;
        int indexCount = 1;
        for(Contatcs contact : listContacts){
            contact.setIndex(indexCount++);
        }
    }

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

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

    @Override
    public Object getValueAt(int rowIndex, int columnIndex) {
        Contatcs contacts = listContacts.get(rowIndex);
        Object retVal = null;
        switch(columnIndex){
        case COLUMN_FIRSTNAME: retVal = contacts.getFirstName(); break;
        case COLUMN_LASTNAME: retVal = contacts.getLastName(); break;
        case COLUMN_PHONENUMBER: retVal = contacts.getPhoneNumber(); break;
        case COLUMN_CITY: retVal = contacts.getCity(); break;
        default: throw new IllegalArgumentException("Invalid column index.");
        }
        return retVal;
    }

    @Override
    public String getColumnName(int columnIndex){
        return columnNames[columnIndex];
    }
    @Override
    public Class<?> getColumnClass(int columnIndex){
        if(listContacts.isEmpty()) return Object.class;
        else return getValueAt(0,columnIndex).getClass();
    }
}

Answer 1

這是一個誰做的小例子：

import java.util.Vector;

import javax.swing.table.AbstractTableModel;

public class TableModel extends AbstractTableModel {

    String[] column_name = new String[]{"Col1","Col2"};
    Vector<String[]> list_value=new Vector<String[]>();

    public TableModel() {
    }

    //add just one line the table
    public void add_row(String[] row_values){
        list_value.add(row_values);
    }

    //change the list 
    public void setList(Vector<String[]>list){
        this.list_value=list;
    }



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

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

    @Override
    public Object getValueAt(int row, int col) {
        return list_value.get(row)[col];
    }

}

這是框架：

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Vector;
import javax.swing.JButton;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.WindowConstants;

public class MainFrame extends javax.swing.JFrame {
    private JButton button1;
    private JTextField val1;
    private JTextField val2;
    private JScrollPane scrollpanel;
    private JButton button_replace;
    private JTable table1;

    public static void main(String[] args) {
        MainFrame frame=new MainFrame();
        frame.show();
    }

    public MainFrame() {
        super();
        //creating components   
        FlowLayout thisLayout = new FlowLayout();
        getContentPane().setLayout(thisLayout);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        button1 = new JButton();
        getContentPane().add(button1);
        button1.setText("add");
        button1.setPreferredSize(new java.awt.Dimension(81, 23));
        val1 = new JTextField();
        getContentPane().add(val1);
        val1.setPreferredSize(new java.awt.Dimension(51, 23));
        val2 = new JTextField();
        getContentPane().add(val2);
        val2.setPreferredSize(new java.awt.Dimension(53, 23));
        pack();
        setSize(400, 300);
        //add the table now
        scrollpanel = new JScrollPane();        
        scrollpanel.setPreferredSize(new java.awt.Dimension(339, 169));
        getContentPane().add(scrollpanel);
        table1 = new JTable();
        scrollpanel.setViewportView(table1);
        table1.setModel(new jtableExemple.TableModel());
        TableModel table_model=(TableModel) table1.getModel();
        table_model.add_row(new String[]{"row1","row1"});
        table_model.add_row(new String[]{"row2","row2"});
        table_model.add_row(new String[]{"row3","row3"});
        button_replace = new JButton();
        getContentPane().add(button_replace);
        button_replace.setText("Replace all list");


        //add action to button 
        button1.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent arg0) {
            TableModel table_model=(TableModel) table1.getModel();
            table_model.add_row(new String[]{val1.getText(),val2.getText()});
            //this line to the change in the UI 
            table1.setRowHeight(table1.getRowHeight());
            }
        });

        button_replace.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent arg0) {
                //create a random list
                TableModel table_model=(TableModel) table1.getModel();
                Vector<String[]>new_list=new Vector<String[]>();
                for(int i=0;i<100;i++)
                    new_list.add(new String[]{"new row "+i,"new row "+i});
                table_model.setList(new_list);
                //this line to the change in the UI 
                table1.setRowHeight(table1.getRowHeight());             
            }
        });

}


}