问题描述

java中JTable的问题，求解，大神在哪里

import java.sql.*;
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;
public class a160407 extends JFrame implements ActionListener{
JButton anl1,anl2,anl3,anl4;
JLabel bq;
JTextField wbk;
JPanel mb1,mb2;
JTable bg;
JScrollPane gd;
aaaa aa;
public static void main(String[] args){
a160407 aaa=new a160407();
}
public a160407(){

    anl1=new JButton("查询");
    anl1.addActionListener(this);
    anl1.setActionCommand("chaxun");
    anl2=new JButton("添加");
    anl2.addActionListener(this);
    anl2.setActionCommand("tianjia");
    anl3=new JButton("删除");
    anl3.addActionListener(this);
    anl3.setActionCommand("shanchu");
    anl4=new JButton("修改");
    anl4.addActionListener(this);
    anl4.setActionCommand("xiugai");
    bq=new JLabel("请输入姓名");
    wbk=new JTextField(7);
    mb1=new JPanel();
    mb2=new JPanel();
    aa=new aaaa();
    bg=new JTable(aa);
    gd=new JScrollPane(bg);

    mb1.setLayout(new FlowLayout());mb1.add(bq);mb1.add(wbk);mb1.add(anl1);

    mb2.setLayout(new FlowLayout());mb2.add(anl2);mb2.add(anl3);mb2.add(anl4);

    this.add(mb1,BorderLayout.NORTH);
    this.add(mb2,BorderLayout.SOUTH);
    this.add(gd);

    this.setResizable(false);
    this.setSize(800,600);
    this.setLocation(300,150);
    this.setTitle("QQ联系人");
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    this.setVisible(true);
}
public void actionPerformed(ActionEvent e){
    if(e.getActionCommand().equals("chaxun")){
        String xingming=this.wbk.getText().trim();
        String sql="select * from QQ where xinmin='"+xingming+"'";
        aa=new aaaa(sql);
        bg.setModel(aa);
    }
    else if(e.getActionCommand().equals("tianjia")){
        tianjia tj=new tianjia(this,"信息添加",true);
        aa=new aaaa();
        bg.setModel(aa);
        System.out.println("fffffffffffffff");
    }
    else if(e.getActionCommand().equals("shanchu")){

        int ii=this.bg.getSelectedRow();
        if(ii==-1){

            JOptionPane.showMessageDialog(this,"请选中要删除的行");
            return;
        }   程序总是运行到下面的这句话出错？？？？？？？？？？？？？？？？？？？？
            String st=(String)aa.getValueAt(ii,0);我发现getValueAt(ii,0)中的0改成1或者其他不是0的数程序就正常了，请好心的大神把我解决一下！
            PreparedStatement ps=null;
            Connection ct=null;
            ResultSet rs=null;
            try{
                 Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
                 ct=DriverManager.getConnection("jdbc:odbc:SQL Sever","sa","923274995");
                 ps=ct.prepareStatement("delete  from QQ where xinmin=?");
                 ps.setString(1,st);
                 ps.executeUpdate();
            }catch(Exception e2){}
            finally{
                try {
                    if(rs!=null)
                    {
                        rs.close();
                    }
                    if(ps!=null)
                    {
                        ps.close();
                    }
                    if(ct!=null)
                    {
                        ct.close();
                    }

                } catch (Exception e3){}

            }aa=new aaaa();
            bg.setModel(aa);

    }
    else if(e.getActionCommand().equals("xiugai")){
        int ii=this.bg.getSelectedRow();
        if(ii==-1){
            JOptionPane.showMessageDialog(this,"请选中要修改的行");
            return;
        }
        new xiugai(this,"信息修改",true,aa,ii);

    }
}

}
要解决的问题在上面代码一排问号？？？？？？的下面

解决方案

你这个 删除记录的sql判断条件是xinmin，然后你getValueAt就应该是获取xinmin，getValueAt中后面一个参数是columnIndex，列值，你看看姓名是哪一列；
还有，建议你用编号做判断，你这整个代码一行注释都没有，醉了。有空学学怎么调试吧，很简单的，你设个断点出错的位置，很好排查的

解决方案二：

关于java中Jtable出现的一些问题

解决方案三：

看看aaaa类的代码

解决方案四：

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.Vector;
import javax.swing.table.*;
class aaaa extends AbstractTableModel {
Vector ziduan,jilu;
PreparedStatement ps=null;
Connection ct=null;
ResultSet rs=null;
public int getRowCount()
{
return this.jilu.size();
}
public int getColumnCount()
{
return this.ziduan.size();
}
public Object getValueAt(int hang, int lie)
{
return ((Vector)this.jilu.get(hang)).get(lie);
}
public String getColumnName(int e)
{
return (String)this.ziduan.get(e);
}
public aaaa(){
bb("select * from QQ");
}
public aaaa(String sql){
bb(sql);
}
public void bb(String a){
ziduan=new Vector();
ziduan.add("编号");
ziduan.add("姓名");
ziduan.add("性别");
ziduan.add("年龄");
ziduan.add("手机号");
ziduan.add("QQ号");

ziduan.add("名片");
ziduan.add("会员");
ziduan.add("签名");
ziduan.add("天数");

jilu=new Vector();

try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
ct=DriverManager.getConnection("jdbc:odbc:SQL Sever","sa","923274995");

ps=ct.prepareStatement(a);

rs=ps.executeQuery();

while(rs.next())
{
Vector hang=new Vector();
hang.add(rs.getInt(1));
hang.add(rs.getString(2));
hang.add(rs.getString(3));
hang.add(rs.getInt(4));
hang.add(rs.getLong(5));
hang.add(rs.getLong(6));
hang.add(rs.getString(7));
hang.add(rs.getString(8));
hang.add(rs.getString(9));
hang.add(rs.getInt(10));
jilu.add(hang);
}
} catch (Exception e){}
finally
{
try {
if(rs!=null)
{
rs.close();

            }
            if(ps!=null)
            {
                ps.close();
            }
            if(ct!=null)
            {
                ct.close();
            }

        } catch (Exception e){}
    }
}

}