[英]How do I make a jtable with mySQL data appear in my tabbed pane instead of in a seperate window?
我第一次使用Java NetBeans创建自己的简单销售点系统。 我有此代码:
package pos_system;
import java.awt.*;
import java.sql.*;
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;
public class Table extends JFrame
{
public Table()
{
ArrayList columnNames = new ArrayList();
ArrayList data = new ArrayList();
// Connect to an MySQL Database, run query, get result set
String url = "jdbc:mysql://localhost:3306/mydb";
String userid = "root";
String password = "nbuser";
String sql = "SELECT * FROM inventorytable";
try (Connection connection = DriverManager.getConnection( url, userid, password );
Statement stmt = connection.createStatement();
ResultSet rs = stmt.executeQuery( sql ))
{
ResultSetMetaData md = rs.getMetaData();
int columns = md.getColumnCount();
// Get column names
for (int i = 1; i <= columns; i++)
{
columnNames.add( md.getColumnName(i) );
}
// Get row data
while (rs.next())
{
ArrayList row = new ArrayList(columns);
for (int i = 1; i <= columns; i++)
{
row.add( rs.getObject(i) );
}
data.add( row );
}
}
catch (SQLException e)
{
System.out.println( e.getMessage() );
}
// Create Vectors and copy over elements from ArrayLists to them
// Vector is deprecated but I am using them in this example to keep
// things simple - the best practice would be to create a custom defined
// class which inherits from the AbstractTableModel class
Vector columnNamesVector = new Vector();
Vector dataVector = new Vector();
for (int i = 0; i < data.size(); i++)
{
ArrayList subArray = (ArrayList)data.get(i);
Vector subVector = new Vector();
for (int j = 0; j < subArray.size(); j++)
{
subVector.add(subArray.get(j));
}
dataVector.add(subVector);
}
for (int i = 0; i < columnNames.size(); i++ )
columnNamesVector.add(columnNames.get(i));
// Create table with database data
JTable table = new JTable(dataVector, columnNamesVector)
{
public Class getColumnClass(int column)
{
for (int row = 0; row < getRowCount(); row++)
{
Object o = getValueAt(row, column);
if (o != null)
{
return o.getClass();
}
}
return Object.class;
}
};
JScrollPane scrollPane = new JScrollPane( table );
getContentPane().add( scrollPane );
JPanel buttonPanel = new JPanel();
getContentPane().add( buttonPanel, BorderLayout.SOUTH );
}
public static void main(String[] args)
{
Table frame = new Table();
frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
frame.pack();
frame.setVisible(true);
}
}
它创建了我需要的jtable
,但与My Jframe
一个单独的类中,该类具有我希望jtable
出现的选项卡式窗格。 如何将此类连接到选项卡式窗格,或者还有另一种显示表格的方式?
通过使类扩展JFrame,迫使您创建和显示JFrame(通常需要更大的灵活性),您正在画一个角落。 实际上,我会冒险地说,我创建的大多数Swing GUI代码都不会扩展JFrame,实际上,很少有人愿意这样做。 更常见的是,您的GUI类将面向创建JPanels,然后将其放置到JFrames或JDialogs或JTabbedPanes中,或者在需要时通过CardLayouts进行交换。 这将大大增加GUI编码的灵活性。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.