通过用户界面处理excel数据库问题
想通过java 的用户界面 来交互式的处理excel数据表中的内容！ 代码如下
import java.awt.*;
import java.util.*;
import javax.swing.*;
import java.awt.event.*;
import java.sql.*;
public class SimpleFrameTest {
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
SizedFrame frame=new SizedFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
});
}
}
class SizedFrame extends JFrame
{
public SizedFrame()
{
Toolkit kit=Toolkit.getDefaultToolkit();
Dimension screenSize=kit.getScreenSize();
int screenHeight=screenSize.height;
int screenWeight=screenSize.width;
this.setSize(screenWeight/2, screenHeight/2);
this.setLocationByPlatform(true);
setTitle("sizedFrame");
//create buttons;
final JButton SearchButton=new JButton("查询");
JLabel production_id=new JLabel("产品号",SwingConstants.RIGHT);
JLabel price_id=new JLabel("价格");
final JTextField production=new JTextField(10);
final JTextField price=new JTextField(10);
JButtonPanel=new JPanel();
JButtonPanel.add(production_id);
JButtonPanel.add(production);
JButtonPanel.add(price_id);
JButtonPanel.add(price);
add(JButtonPanel,BorderLayout.NORTH);
// 这一段函数是初始化 连接链表
try{
String driverName = "sun.jdbc.odbc.JdbcOdbcDriver";
String dbURL = "jdbc:odbc:driver={Microsoft Excel Driver (*.xls)};DBQ=C:\\Documents and Settings\\Administrator\\桌面\\example.xls;READONLY=FALSE"; // 不设置数据源
Properties p=new Properties();
p.put("charSet", "gbk");
Class.forName(driverName);
Connection dbConn=null;
dbConn = DriverManager.getConnection(dbURL, p);
final Statement smt = dbConn.createStatement(); }catch (ClassNotFoundException e)
{
e.printStackTrace();
} catch (SQLException e)
{
e.printStackTrace();
} finally
{
try
{
dbConn.close();
} catch (SQLException e)
{
e.printStackTrace();
}
}
SearchButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
try
{
String select_id=production.getText();
ResultSet set = smt.executeQuery("select * from [sheet1$] where Id=select_id"); price.setText(set.getString(3));
}catch (SQLException e)
{
e.printStackTrace();
}
}
});
}
private JPanel JButtonPanel;
}
想按下查询Button调用actionPerformed函数来得到数据表中的价格 ，然后显示在价格文本框中！
现在问题就是 在actionPerformed函数中总是出现类似 变量 smt无法处理的错误 我都不知道该将红色部分的这些语句怎么放了？？高手指教！！万分感谢！
[解决办法]
final Statement smt定义为类全局变量试试。
[解决办法]
你写的代码有很多地方值得商榷，至少代码需要优化，给你一个能跑的例子
你自己修改DBQ文件的位置，example文件需要有id price至少这两个字段
import java.awt.BorderLayout;import java.awt.Dimension;import java.awt.EventQueue;import java.awt.Toolkit;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.WindowEvent;import java.awt.event.WindowListener;import java.sql.Connection;import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;import java.util.Properties;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.JTextField;import javax.swing.SwingConstants;public class SimpleFrameTest { public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { SizedFrame frame = new SizedFrame(); frame.addWindowListener(frame); frame.setVisible(true); } }); }}class SizedFrame extends JFrame implements WindowListener{ @Override public void windowOpened(WindowEvent e) { // TODO Auto-generated method stub } @Override public void windowClosing(WindowEvent e) { // TODO Auto-generated method stub this.closeCon(); System.exit(0); } @Override public void windowClosed(WindowEvent e) { // TODO Auto-generated method stub } @Override public void windowIconified(WindowEvent e) { // TODO Auto-generated method stub } @Override public void windowDeiconified(WindowEvent e) { // TODO Auto-generated method stub } @Override public void windowActivated(WindowEvent e) { // TODO Auto-generated method stub } @Override public void windowDeactivated(WindowEvent e) { // TODO Auto-generated method stub } private Connection dbConn = null; private Statement smt =null; private void closeCon(){ try { smt.close(); dbConn.close(); } catch (SQLException e) { e.printStackTrace(); } } public SizedFrame() { Toolkit kit = Toolkit.getDefaultToolkit(); Dimension screenSize = kit.getScreenSize(); int screenHeight = screenSize.height; int screenWeight = screenSize.width; this.setSize(screenWeight / 2, screenHeight / 2); this.setLocationByPlatform(true); setTitle("sizedFrame"); // create buttons; final JButton searchButton = new JButton("查询"); JLabel production_id = new JLabel("产品号", SwingConstants.RIGHT); JLabel price_id = new JLabel("价格"); final JTextField production = new JTextField(10); final JTextField price = new JTextField(10); JButtonPanel = new JPanel(); JButtonPanel.add(production_id); JButtonPanel.add(production); JButtonPanel.add(price_id); JButtonPanel.add(price); JButtonPanel.add(searchButton); add(JButtonPanel, BorderLayout.NORTH); // 这一段函数是初始化 连接链表 try { String driverName = "sun.jdbc.odbc.JdbcOdbcDriver"; String dbURL = "jdbc:odbc:driver={Microsoft Excel Driver (*.xls)};DBQ=resources/excel/example.xls;READONLY=FALSE"; // 不设置数据源 Properties p = new Properties(); p.put("charSet", "gbk"); Class.forName(driverName);// Connection dbConn = null; dbConn = DriverManager.getConnection(dbURL, p); smt = dbConn.createStatement(); } catch (ClassNotFoundException e) { e.printStackTrace(); } catch (SQLException e) { e.printStackTrace(); } searchButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { try { String select_id_str = production.getText(); int select_id=Integer.parseInt(select_id_str); ResultSet set = smt .executeQuery("select * from [sheet1$] where id="+select_id); String priceStr=""; while(set.next()){ priceStr=set.getString("price"); } price.setText(priceStr); } catch (SQLException e) { e.printStackTrace(); } } }); } private JPanel JButtonPanel;}