运行StuDialog.class出现下面错误提示，初学Java请求帮助找出下面是什么原因？
java.sql.SQLException: No value specified for parameter 2
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1075)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:989)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:984)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:929)
at com.mysql.jdbc.PreparedStatement.checkAllParametersSet(PreparedStatement.java:2560)
at com.mysql.jdbc.PreparedStatement.fillSendPacket(PreparedStatement.java:2536)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2383)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2327)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2312)
at com.studentmanager.StuAddDialog.actionPerformed(StuAddDialog.java:109)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at java.awt.Component.processMouseEvent(Component.java:6216)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
at java.awt.Component.processEvent(Component.java:5981)
at java.awt.Container.processEvent(Container.java:2041)
at java.awt.Component.dispatchEventImpl(Component.java:4583)
at java.awt.Container.dispatchEventImpl(Container.java:2099)
at java.awt.Component.dispatchEvent(Component.java:4413)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4556)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4220)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4150)
at java.awt.Container.dispatchEventImpl(Container.java:2085)
at java.awt.Window.dispatchEventImpl(Window.java:2475)
at java.awt.Component.dispatchEvent(Component.java:4413)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:178)
at java.awt.Dialog$1.run(Dialog.java:1051)
at java.awt.Dialog$3.run(Dialog.java:1103)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Dialog.show(Dialog.java:1101)
at java.awt.Component.show(Component.java:1516)
at java.awt.Component.setVisible(Component.java:1468)
at java.awt.Window.setVisible(Window.java:841)
at java.awt.Dialog.setVisible(Dialog.java:991)
at com.studentmanager.StuAddDialog.(StuAddDialog.java:73)
at com.studentmanager.StuDialog.actionPerformed(StuDialog.java:109)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at java.awt.Component.processMouseEvent(Component.java:6216)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
at java.awt.Component.processEvent(Component.java:5981)
at java.awt.Container.processEvent(Container.java:2041)
at java.awt.Component.dispatchEventImpl(Component.java:4583)
at java.awt.Container.dispatchEventImpl(Container.java:2099)
at java.awt.Component.dispatchEvent(Component.java:4413)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4556)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4220)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4150)
at java.awt.Container.dispatchEventImpl(Container.java:2085)
at java.awt.Window.dispatchEventImpl(Window.java:2475)
at java.awt.Component.dispatchEvent(Component.java:4413)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
1、StuDialog.class如下：
package com.studentmanager;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.Vector;
public class StuDialog extends JFrame implements ActionListener{
//定义一些控件
JPanel jp1,jp2;
JLabel jl1;
JButton jb1,jb2,jb3,jb4;
JTable jt;
JScrollPane jsp;
JTextField jtf;
public static void main(String[] args) {
// TODO Auto-generated method stub
StuDialog stuDialog=new StuDialog();
}
public StuDialog()
{
jp1=new JPanel();
jtf=new JTextField(10);
jb1=new JButton("查询");
jb1.addActionListener(this);
jl1=new JLabel("请输入名字");
//把各个控件加入到jp1
jp1.add(jl1);
jp1.add(jtf);
jp1.add(jb1);
jp2=new JPanel();
jb2=new JButton("添加");
jb2.addActionListener(this);
jb3=new JButton("修改");
jb4=new JButton("删除");
//把各个按钮就加入到jp2
jp2.add(jb2);
jp2.add(jb3);
jp2.add(jb4);
/*//rowData可以存放多行
Vector hang=new Vector();
hang.add("sp001");
hang.add("孙悟空");
hang.add("男");
hang.add("25");
hang.add("火锅山");
hang.add("少林派");
//加入到rowData
rowData.add(hang);*/
//创建一个数据模型对象
StuModel sm=new StuModel();
//初始化JTable
jt=new JTable(sm);
//初始化Jsp JScrollPane
jsp=new JScrollPane(jt);
//把jsp放入JFrame
this.add(jsp);
this.add(jp1,"North");
this.add(jp2,"South");
this.setSize(400,300);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
}
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
//判断是哪个按钮被点击
if(e.getSource()==jb1)
{
System.out.println("用户想查询");
//因为把表的现实的数据封装到StuModel中，那么我们就可以
//简单完成查询
//查询数据库，更新JTable
String name=this.jtf.getText().trim();
//写一个SQL语句
String sql="select * from stu where stuName='"+name+"'";
//构建新的数据模型，并更新
StuModel sm=new StuModel(sql);
//更新JTable
jt.setModel(sm);
//当用户点击添加
}
else if(e.getSource()==jb2)
{
StuAddDialog sa=new StuAddDialog(this,"添加学生",true);
//重新再获得新的数据模型
}
}
}
2、StuAddDialog.class如下：
package com.studentmanager;
import java.awt.*;
import javax.swing.*;
import java.util.*;
import java.awt.event.*;
import javax.swing.JDialog;
import java.sql.*;
public class StuAddDialog extends JDialog implements ActionListener {
//定义我需要的swing控件
JPanel jp1,jp2,jp3;
JTextField jtf1,jtf2,jtf3,jtf4,jtf5,jtf6;
JButton jb1,jb2;
JLabel jl1,jl2,jl3,jl4,jl5,jl6;
//owner 它的父窗口
//title窗口名
//model指定是模式窗口，还是非模式窗口
public StuAddDialog(Frame owner,String title,boolean modal)
{
super(owner,title,modal);//调用父类构造方法,达到模式对话框效果
jl1=new JLabel("学号");
jl2=new JLabel("姓名");
jl3=new JLabel("性别");
jl4=new JLabel("年龄");
jl5=new JLabel("籍贯");
jl6=new JLabel("系别");
jtf1=new JTextField();
jtf2=new JTextField();
jtf3=new JTextField();
jtf4=new JTextField();
jtf5=new JTextField();
jtf6=new JTextField();
jb1=new JButton("添加");
jb1.addActionListener(this);
jb2=new JButton("取消");
jp1=new JPanel();
jp2=new JPanel();
jp3=new JPanel();
//设置布局
jp1.setLayout(new GridLayout(6,1));
jp2.setLayout(new GridLayout(6,1));
jp1.add(jl1);
jp1.add(jl2);
jp1.add(jl3);
jp1.add(jl4);
jp1.add(jl5);
jp1.add(jl6);
jp2.add(jtf1);
jp2.add(jtf2);
jp2.add(jtf3);
jp2.add(jtf4);
jp2.add(jtf5);
jp2.add(jtf6);
jp3.add(jb1);
jp3.add(jb2);
this.add(jp1,BorderLayout.WEST);
this.add(jp2,BorderLayout.CENTER);
this.add(jp3,BorderLayout.SOUTH);
jb1.addActionListener(this);
//展现
this.setSize(300,250);
//this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==jb1)
{
//对用户点击添加按钮后的响应动作
//连接数据库
Connection ct=null;
Statement stmt=null;
ResultSet rs=null;
PreparedStatement psmt=null;
//连接数据库，判断用户是否合法
try{
//1加载驱动
Class.forName("com.mysql.jdbc.Driver");
//2创建连接对象,注册驱动程序并打开连接对象
ct=DriverManager.getConnection("jdbc:mysql://localhost:3306/student?useUnicode=true&characterEncoding=GBK","root","123456");
psmt=ct.prepareStatement("select * from stu");
//3获取语句对象
//stmt=ct.createStatement();
//与编译语句对象
psmt=ct.prepareStatement("insert into stu values(?,?,?,?,?,?)");
//给参数赋值
psmt.setString(1,jtf1.getText());
psmt.setString(1,jtf2.getText());
psmt.setString(1,jtf3.getText());
psmt.setString(1,jtf4.getText());
psmt.setString(1,jtf5.getText());
psmt.setString(1,jtf6.getText());
//4执行操作
psmt.executeUpdate();
this.dispose();//关闭对话框
}catch(ClassNotFoundException e1)
{
e1.printStackTrace();
}catch(SQLException e2)
{
e2.printStackTrace();
}
finally
{
//释放语句对象，连接对象
try
{
if(rs!=null) rs.close();
if(stmt!=null) stmt.close();
if(ct!=null) ct.close();
}catch(Exception e2)
{
e2.printStackTrace();
}
}
}
}
@Override
public Container getContentPane() {
// TODO Auto-generated method stub
return super.getContentPane();
}
@Override
public void setContentPane(Container contentPane) {
// TODO Auto-generated method stub
super.setContentPane(contentPane);
}
}
