Question

我目前正在研究Eclipse上的应用程序，我需要的是按下一个按钮然后打开一个JFrame，其中包含来自JTable上MySQL DB的值。我最近在这里问了一个关于我在尝试使用绝对布局（空布局）显示列时出现的错误的问题，并且我被告知最好使用布局。问题是我在现有表格上有多个按钮和东西，改变布局会隐藏一些功能，我无法找到解决方案。所以我想到了一些东西。由于JTable存在绝对布局问题，而布局管理器不能帮助我使用我的多个按钮，我可以从现有表单中删除JTable（空布局）并保留按钮。结果，当用户按下＆＃34;按名称排序＆＃34;或者＆＃34;添加控制台＆＃34;我在现有表单上有mySQL应用程序的按钮，然后会弹出一个新的JFrame并显示正确的JTable。有可能这样做吗？

JTable创建过程：

 package newWindow;

  import java.awt.*;
  import java.sql.*;
  import javax.swing.*;
  import javax.swing.table.*;

 public class newWindow {

 public static void main(String[] args) {
    new newWindow();
   }

 public newWindow() {
   EventQueue.invokeLater(new Runnable() {
       @Override
         public void run() {
           try {
 UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
 } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {}

  try
  {
  Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/test1?user=mySQL&password=7777");
  Statement stmt = conn.createStatement();
  ResultSet rs = stmt.executeQuery("SELECT * FROM consoles INNER JOIN hardware ON consoles.id=hardware.id");
  ResultSetMetaData md = rs.getMetaData();
  int columnCount = md.getColumnCount();
  String[] cols = new String[columnCount];
  int i;
  for (i=1;i<= columnCount;i++)
   {
     cols[i-1] = md.getColumnName(i);
   }
   DefaultTableModel model = new DefaultTableModel(cols,0);
     while (rs.next())
       {
         Object[] row = new Object[columnCount];
             for (i = 1 ; i <= columnCount ; i++)
                 {
                   row[i-1] = rs.getObject(i);
                 }
      model.addRow(row);
        }
   JFrame frame = new JFrame("Promitheas");
   JTable table = new JTable(model);
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.getContentPane().setLayout(new GridLayout());
   JScrollPane scrollPane = new JScrollPane(table);
   frame.getContentPane().add(scrollPane);
   frame.pack();
   frame.setLocationRelativeTo(null);
   frame.setVisible(true);
   conn.close();
   stmt.close();
   rs.close();
  } catch (SQLException case1) { case1.printStackTrace();
  } catch (Exception case2) { case2.printStackTrace();}               
    }
  });
 }
}

按名称按钮排序：

try{
   conn = DriverManager.getConnection("jdbc:mysql://localhost/test1?user=mySQL&password=7777");
   String[] gender = { "ASC", "DESC"};
   int response = JOptionPane.showOptionDialog(null,"Ascending or Descending Order?","Make a choice...",0,JOptionPane.INFORMATION_MESSAGE,null,gender,gender[0]);
   stmtsortname = conn.createStatement();
   String sql = null;
   if (response == JOptionPane.YES_OPTION)
        sql = "ASC";
   if (response == JOptionPane.NO_OPTION)
        sql = "DESC";
  rssortname = stmtsortname.executeQuery("SELECT * FROM consoles INNER JOIN hardware ON consoles.id=hardware.id ORDER BY consoles.name "+sql);
                              .
                              .
                              . 
             create an newJTable overwriting the old
                              .
                              .
 } catch ...

Answer 1

创建一个类，将您想要传输的数据作为参数传递。你的魔法设置表并设置可见的真实并用你的逻辑替换blala

public class NewJFrame extends JFrame{

   public NewJFrame(Data data){
      blala
      this.setVisible(true);
   }
}

然后在按钮上有ActionListner或其中的类似内容

new NewJFrame(data);

Answer 2

答案

JButton btnStartTable = new JButton("Start Table");
    btnStartTable.addMouseListener(new MouseAdapter() {
        @Override
        public void mouseClicked(MouseEvent arg0){
        try
    {

        conn = DriverManager.getConnection("jdbc:mysql://localhost/test1?user=mySQL&password=7777");
        stmt = conn.createStatement();
        rs = stmt.executeQuery("SELECT * FROM consoles INNER JOIN hardware ON consoles.id=hardware.id");
        md = rs.getMetaData();
        columnCount = md.getColumnCount();
        String[] cols = new String[columnCount];
        for (i=1;i<= columnCount;i++)
         {
        cols[i-1] = md.getColumnName(i);
         }
    model = new DefaultTableModel(cols,0);
        while (rs.next())
        {
              Object[] row = new Object[columnCount];
                 for (i = 1 ; i <= columnCount ; i++)
                 {
                    row[i-1] = rs.getObject(i);
                 }
        model.addRow(row);
        }

    frame2 = new JFrame();
    frame2.setVisible(true);
    JTable table = new JTable(model);
    f2.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f2.getContentPane().setLayout(new GridLayout());
    JScrollPane scrollPane = new JScrollPane(table);
    f2.getContentPane().add(scrollPane);
    f2.pack();
    f2.setLocationRelativeTo(null);
    f2.setVisible(true);
    conn.close();
    stmt.close();
    rs.close();
    } catch (SQLException case1) { case1.printStackTrace();
    } catch (Exception case2) { case2.printStackTrace();}}
    });
    btnStartTable.setBounds(10, 11, 126, 23);
    frame.getContentPane().add(btnStartTable);

单击按钮以打开新的JFrame

2 个答案: