初学者做界面出现问题求大神解决

兲化 2016-06-16 10:28:16

代码信息！



package sqlServer;



import java.awt.*;

import java.awt.event.*;

import java.sql.*;

import java.util.Collection;



import javax.swing.*;



public class StudentManage extends Frame implements ActionListener {

	//主方法

	public static void main(String[] args){

		//调用下面的方法

		new StudentManage();

		

	}

	

	JLabel lblSno;

	JTextArea taResult;

	JPanel pnlMain;

	JTextField txtName;

	JButton btnQuery;

	//构造方法

	

	public StudentManage(){

		

		setLayout(new BorderLayout());

		lblSno=new JLabel("请输入要查询的学生姓名：");

		taResult=new JTextArea();

		btnQuery=new JButton("查询");

		txtName=new JTextField(16);

		pnlMain=new JPanel();

		pnlMain.setBackground(Color.orange);

		pnlMain.add(lblSno);

		pnlMain.add(txtName);

		pnlMain.add(btnQuery);

	    add("North",pnlMain);

	    add("Center",taResult);

	    taResult.setEditable(false);

	    //注册到监听类

	    btnQuery.addActionListener(this);

	    //窗口关闭事件处理

	    addWindowListener(new WindowAdapter(){

	    	public void windowClosing(WindowEvent e){

	    		System.exit(0);

	    	}

	    });

	    setSize(500,300);

	    setTitle("学生信息查询");

	    setBackground(Color.ORANGE);

	    setVisible(true);

	}

	

	public void actionPerformed(ActionEvent evt) {

	    

		//用户点击查询按钮

		if(evt.getSource()==btnQuery){

			taResult.setFont(new Font("宋体",Font.PLAIN,14));

			//显示提示信息

			taResult.setText("^-^-^-^-^-^-^-^查询结果^-^-^-^-^-^-^-^"+'\n');

			taResult.append('\n'+"会员号"+" "+"会员名称"+" "+"性别"+" "+"出生年月"+" "+"家庭住址"+" "+"密码"+'\n');

			taResult.append("--------------------------------------------"+'\n');

			try{

				//显示会员信息

				dispalyCustomer();

			}

			catch(SQLException e){

				JOptionPane.showInternalMessageDialog(null,e.toString());

			}

			

		}

		

	}

	//显示会员信息方法

	public void dispalyCustomer() throws SQLException{

		

		String no,name,gender,birth,address,password;

		String strQuery;

		try{

			//设置数据库驱动程序

			Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");

		}

		catch(ClassNotFoundException e){

			JOptionPane.showMessageDialog(null,"驱动程序错误！");

			return;

		}

		//建立连接

		Connection con=DriverManager.getConnection("jbdc:odbc:WebShop");

		//创建Statement对象

		Statement sql=con.createStatement();

		strQuery="select * from Goods where g_Name like'%'"+

		txtName.getText().trim()+'%';

		ResultSet rs=sql.executeQuery(strQuery);

		//输出查询结果

		while(rs.next()){

		no =rs.getString("c_ID");

		name =rs.getString("c_TrueName");

		gender =rs.getString("c_Gender");

		birth =rs.getString("c_Birth").substring(0,10);

		address=rs.getString("c_Address").trim();	

		password=rs.getString("c_PassWord");

		taResult.append(no+""+name+""+gender+""+birth+""+address+""+password+'\n');

		}

	}



}

 错误信息！



Exception in thread "AWT-EventQueue-0" java.lang.RuntimeException: JOptionPane: parentComponent does not have a valid parent

	at javax.swing.JOptionPane.createInternalFrame(Unknown Source)

	at javax.swing.JOptionPane.showInternalOptionDialog(Unknown Source)

	at javax.swing.JOptionPane.showInternalMessageDialog(Unknown Source)

	at javax.swing.JOptionPane.showInternalMessageDialog(Unknown Source)

	at javax.swing.JOptionPane.showInternalMessageDialog(Unknown Source)

	at sqlServer.StudentManage.actionPerformed(StudentManage.java:68)

	at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)

	at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)

	at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)

	at javax.swing.DefaultButtonModel.setPressed(Unknown Source)

	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)

	at java.awt.Component.processMouseEvent(Unknown Source)

	at javax.swing.JComponent.processMouseEvent(Unknown Source)

	at java.awt.Component.processEvent(Unknown Source)

	at java.awt.Container.processEvent(Unknown Source)

	at java.awt.Component.dispatchEventImpl(Unknown Source)

	at java.awt.Container.dispatchEventImpl(Unknown Source)

	at java.awt.Component.dispatchEvent(Unknown Source)

	at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)

	at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)

	at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)

	at java.awt.Container.dispatchEventImpl(Unknown Source)

	at java.awt.Window.dispatchEventImpl(Unknown Source)

	at java.awt.Component.dispatchEvent(Unknown Source)

	at java.awt.EventQueue.dispatchEventImpl(Unknown Source)

	at java.awt.EventQueue.access$300(Unknown Source)

	at java.awt.EventQueue$3.run(Unknown Source)

	at java.awt.EventQueue$3.run(Unknown Source)

	at java.security.AccessController.doPrivileged(Native Method)

	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)

	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)

	at java.awt.EventQueue$4.run(Unknown Source)

	at java.awt.EventQueue$4.run(Unknown Source)

	at java.security.AccessController.doPrivileged(Native Method)

	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)

	at java.awt.EventQueue.dispatchEvent(Unknown Source)

	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)

	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)

	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)

	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

	at java.awt.EventDispatchThread.run(Unknown Source)