java关于验证登陆的有关问题

java关于验证登陆的问题
本帖最后由 Waitxl 于 2013-10-18 11:23:54 编辑出现了几句错误，今天刚刚学连接数据库，请大神指教指教，先谢谢了。


import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.table.*;
import java.lang.Object.*;
import java.util.*;
import java.sql.*;
public class DengLu extends JFrame implements ActionListener{
     public static void main(String[] args){
  new DengLu();
  //i.t();
 }

 JButton b1=new JButton("登陆");
 JLabel l1=new JLabel("用户名");
 JLabel l2=new JLabel("密码");
 JTextField t1=new JTextField(10);
 JTextField t2=new JTextField(10);
 
 String id=null;
 String password=null;
 String passwordD;
 public int screanWidth1,screanHeight1; 
 
 public DengLu()
 {
  Toolkit tool=getToolkit();   
  Dimension dim=tool.getScreenSize();    
  screanWidth1=dim.width;    
  screanHeight1=dim.height; 
  setTitle("超市管理系统登录界面");
  setLayout(null); 
  add(b1);
  add(l1);
  add(l2);
  add(t1);
  add(t2);
  l1.setBounds(130,45,50,40);
  t1.setBounds(210,55,100,25);
  l2.setBounds(130, 120, 50,40);
  t2.setBounds(210,130,100,25);
  b1.setBounds(210, 200, 60, 20);
  b1.addActionListener(this);
 // frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  this.setBounds(dim.width/3,dim.height/3,500,300);
  this.setVisible(true);
 }
 
 

    @Override
    public void actionPerformed(ActionEvent e) {
      
       if(e.getSource()==b1) {   
       id=t1.getText();
       password=t2.getText();
       Connection con; 
       Statement sql; 
       ResultSet rs;
       try
       {
            Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
            String url="jdbc:odbc:SuperMaket";
            con=DriverManager.getConnection(url);
            sql=con.createStatement(); 
            rs=sql.executeQuery("SELECT * FROM CustomMessage where ID='"+id+"'"); 
            while(rs.next())
            {   
            passwordD=rs.getString(2); 
            }
           // persontyD=rs.getString(3);}  
            con.close();            
       }
       catch?(SQLException g)
       {
          System.out.println(g);
       } 
       if(password.equals(passwordD))
       {      
       new ZhuJieMian();
       this.setVisible(false);
       }
       else
       {
           JOptionPane.showMessageDialog(this,"帐户或密码错误\n请重新输入","提示",JOptionPane.WARNING_MESSAGE); 
       }
    }              
}

java jdbc
[解决办法]

引用:

Quote: 引用:

错误是什么。把问题描述清楚

catch?(SQLException g); 错误提示 illegal character：\160
还有最后那个大括号的错误提示是reached end of file while parsing

大括号没有匹配。少了个异常处理：

给你把完整代码贴出来：


import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;

public class DengLu extends JFrame implements ActionListener {
public static void main(String[] args) {
new DengLu();
// i.t();
}

JButton b1 = new JButton("登陆");
JLabel l1 = new JLabel("用户名");
JLabel l2 = new JLabel("密码");
JTextField t1 = new JTextField(10);
JTextField t2 = new JTextField(10);

String id = null;
String password = null;
String passwordD;
public int screanWidth1, screanHeight1;

public DengLu() {
Toolkit tool = getToolkit();
Dimension dim = tool.getScreenSize();
screanWidth1 = dim.width;
screanHeight1 = dim.height;
setTitle("超市管理系统登录界面");
setLayout(null);
add(b1);
add(l1);
add(l2);
add(t1);
add(t2);
l1.setBounds(130, 45, 50, 40);
t1.setBounds(210, 55, 100, 25);
l2.setBounds(130, 120, 50, 40);
t2.setBounds(210, 130, 100, 25);
b1.setBounds(210, 200, 60, 20);
b1.addActionListener(this);
// frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setBounds(dim.width / 3, dim.height / 3, 500, 300);
this.setVisible(true);
}

@Override
public void actionPerformed(ActionEvent e) {

if (e.getSource() == b1) {
id = t1.getText();
password = t2.getText();
Connection con;
Statement sql;
ResultSet rs;
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
String url = "jdbc:odbc:SuperMaket";
con = DriverManager.getConnection(url);
sql = con.createStatement();
rs = sql.executeQuery("SELECT * FROM CustomMessage where ID='"
+ id + "'");
while (rs.next()) {
passwordD = rs.getString(2);
}
// persontyD=rs.getString(3);}
con.close();
} catch (SQLException g) {
System.out.println(g);
} catch (ClassNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
if (password.equals(passwordD)) {
new ZhuJieMian();
this.setVisible(false);
} else {
JOptionPane.showMessageDialog(this, "帐户或密码错误\n请重新输入", "提示",
JOptionPane.WARNING_MESSAGE);
}
}
}
}

java关于验证登陆的有关问题

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