java - 将 txt 或 xls 加载到 JTable

Question

我正在尝试加载一个 txt 文件，其中包含我想要加载到 JTable 的所有信息，但我不知道该怎么做。我寻找一种解决方案，但找不到真正的解决方案。请帮忙!这是我的代码:

import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedWriter;
import java.io.FileWriter;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableModel;


public class Table2 extends JFrame implements ActionListener, TableModelListener{


//String[] column = {"Name","Age","Gender"};
Object[][] data = {{"John","20","Male"}};
JTable table = new JTable(new DefaultTableModel(data, new Object[]{"Name", "Age","Gender"})){

        public Component prepareRenderer(TableCellRenderer r, int data, int col){ //gives a pattern to the table cells.
        Component c = super.prepareRenderer(r, data, col);

        if(data % 2 == 0){
            c.setBackground(Color.PINK);
        }
        else{
            c.setBackground(Color.LIGHT_GRAY);
        }
        return c;
    }

};

//JTable table = new JTable(data,column);

public Table2(){

    table.setPreferredScrollableViewportSize(new Dimension(300,200));
    table.setFillsViewportHeight(true);

    JScrollPane scrollpane = new JScrollPane(table);
    add(scrollpane);

    table.getModel().addTableModelListener(this); //Adds the model listener to the table. (checks if any changes are made and activated on table changed method.)
}

public static void main(String[] args) {

    Table2 table = new Table2();
    table.setLayout(new FlowLayout());
    table.setVisible(true);
    table.setSize(400,300);
    table.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    table.setResizable(false);
    table.setTitle("Table Prictice on JFrame");
    //table.pack();

    JButton button = new JButton("Add");
    table.add(button);
    button.addActionListener(table);
}

public void actionPerformed(ActionEvent e) {

    DefaultTableModel model = (DefaultTableModel) table.getModel();
    model.addRow(new Object[]{"", "", ""});
    System.out.println("Action Performed!");
}

@Override
public void tableChanged(TableModelEvent e) {

    System.out.println("Table change detected by tableChange method!");
    int row = e.getFirstRow();
    int column = e.getColumn();
    TableModel model = (TableModel)e.getSource();
    String columnName = model.getColumnName(column);
    System.out.println("---TEST LINE---");

    try {

        saveTable();
    }

    catch (Exception e2) {

        e2.printStackTrace();
    }
} 

public void saveTable()throws Exception
{
  BufferedWriter bfw = new BufferedWriter(new FileWriter("Table Data.txt")); //use Excel extension once finished. (txt for now)
  for(int i = 0 ; i < table.getColumnCount() ; i++)
  {
    bfw.write(table.getColumnName(i));
    bfw.write("\t");
  }

  for (int i = 0 ; i < table.getRowCount(); i++)
  {
    bfw.newLine();
    for(int j = 0 ; j < table.getColumnCount();j++)
    {
      bfw.write((String)(table.getValueAt(i,j)));
      bfw.write("\t");;
    }
  }
  bfw.close();
}

}

基本上我想在每次重新启动程序时加载txt文件，以便存储所有信息。

Answer 1

加载数据的代码与写入数据的代码相反:

1. 从文件中读取一行数据
2. 使用String.split(...)为每列创建一个值数组
3. 使用 DefaultTableModel.addRow(...) 方法将数组添加到 TableModel
4. 重复步骤 1-3，直到读取所有数据，然后使用 JTable.setModel(...) 方法将 TableModel 添加到 JTable。