How to display mysql in java

import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.ResultSetMetaData; import java.sql.SQLException; import java.util.Vector; import javax.swing.JOptionPane; public class PutinStorage { // 得到数据库表数据 public static Vector getRows(){ String sql_url = "jdbc:mysql://localhost:3306/haha"; //数据库路径（一般都是这样写），test是数据库名称 String name = "root"; //用户名 String password = "123456"; //密码 Connection conn; PreparedStatement preparedStatement = null; Vector rows = null; Vector columnHeads = null; try { Class.forName("com.mysql.jdbc.Driver"); //连接驱动 conn = DriverManager.getConnection(sql_url, name, password); //连接数据库 // if(!conn.isClosed()) // System.out.println("成功连接数据库"); preparedStatement = conn.prepareStatement("select * from aa"); ResultSet result1 = preparedStatement.executeQuery(); if(result1.wasNull()) JOptionPane.showMessageDialog(null, "结果集中无记录"); rows = new Vector(); ResultSetMetaData rsmd = result1.getMetaData(); while(result1.next()){ rows.addElement(getNextRow(result1,rsmd)); } } catch (ClassNotFoundException e) { // TODO Auto-generated catch block System.out.println("未成功加载驱动。"); e.printStackTrace(); } catch (SQLException e) { // TODO Auto-generated catch block System.out.println("未成功打开数据库。"); e.printStackTrace(); } return rows; } // 得到数据库表头 public static Vector getHead(){ String sql_url = "jdbc:mysql://localhost:3306/haha"; //数据库路径（一般都是这样写），test是数据库名称 String name = "root"; //用户名 String password = "123456"; //密码 Connection conn; PreparedStatement preparedStatement = null; Vector columnHeads = null; try { Class.forName("com.mysql.jdbc.Driver"); //连接驱动 conn = DriverManager.getConnection(sql_url, name, password); //连接数据库 // if(!conn.isClosed()) // System.out.println("成功连接数据库"); preparedStatement = conn.prepareStatement("select * from aa"); ResultSet result1 = preparedStatement.executeQuery(); boolean moreRecords = result1.next(); if(!moreRecords) JOptionPane.showMessageDialog(null, "结果集中无记录"); columnHeads = new Vector(); ResultSetMetaData rsmd = result1.getMetaData(); for(int i = 1; i 
MyFrame class : 
import java.awt.BorderLayout; import java.awt.FlowLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.SQLException; import java.util.Vector; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.table.DefaultTableModel; import per.tushu.storage.PutinStorage; public class MyFrame extends JFrame{ DefaultTableModel tableModel; // 默认显示的表格 JButton add,del,exit,save; // 各处理按钮 JTable table; // 表格 JPanel panelUP; //增加信息的面板 // 构造函数 public MyFrame(){ this.setBounds(300, 200, 600, 450); // 设置窗体大小 this.setTitle("测试"); // 设置窗体名称 this.setLayout(new BorderLayout()); // 设置窗体的布局方式 // 新建各按钮组件 add = new JButton("增加"); del = new JButton("删除"); save = new JButton("保存"); exit = new JButton("退出"); panelUP = new JPanel(); // 新建按钮组件面板 panelUP.setLayout(new FlowLayout(FlowLayout.LEFT)); // 设置面板的布局方式 // 将各按钮组件依次添加到面板中 panelUP.add(add); panelUP.add(del); panelUP.add(save); panelUP.add(exit); // 取得haha数据库的aa表的各行数据 Vector rowData = PutinStorage.getRows(); // 取得haha数据库的aa表的表头数据 Vector columnNames = PutinStorage.getHead(); // 新建表格 tableModel = new DefaultTableModel(rowData,columnNames); table = new JTable(tableModel); JScrollPane s = new JScrollPane(table); // 将面板和表格分别添加到窗体中 this.add(panelUP,BorderLayout.NORTH); this.add(s); // 事件处理 MyEvent(); this.setVisible(true); // 显示窗体 this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // 设置窗体可关闭 } // 事件处理 public void MyEvent(){ // 增加 add.addActionListener(new ActionListener(){ @Override public void actionPerformed(ActionEvent arg0) { // 增加一行空白区域 tableModel.addRow(new Vector()); } }); // 删除 del.addActionListener(new ActionListener(){ @Override public void actionPerformed(ActionEvent arg0) { // TODO Auto-generated method stub // 删除指定行 int rowcount = table.getSelectedRow(); if(rowcount >= 0){ tableModel.removeRow(rowcount); } } }); /** * 保存 * 我的解决办法是直接将aa表中的全部数据删除， * 将表格中的所有内容获取到, * 然后将表格数据重新写入aa表 */ save.addActionListener(new ActionListener(){ @Override public void actionPerformed(ActionEvent e) { int column = table.getColumnCount(); // 表格列数 int row = table.getRowCount(); // 表格行数 // value数组存放表格中的所有数据 String[][] value = new String[row][column]; for(int i = 0; i 
When executing the above code, the initially displayed form is as follows: 
 Click the Add button and write the content that needs to be added (I added it three times) as shown below: 
Click the Delete button to delete the specified row (I deleted Lines 2 and 4), as shown below: 
Click the save button and you will find that the window is also closed. You can re-execute the code and you will find that the table page that appears is the same as the picture above. 
Click the exit button to close the window. 
        

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