mysql怎么实现用户注册

具体方法如下：

package cn.edu.hbue.qyf;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
@SuppressWarnings("serial")
public class HomeWork6 extends JFrame implements ActionListener{
private JTextField custNameTextField;
private JTextField codeNameTextField;
private JTextField recodeNameTextField;
private JLabel custNameLabel;
private JLabel codeLabel;
private JLabel recodeLabel;
private JButton confirmButton;
private JButton cancelButton;
public HomeWork6(){
setSize(250, 200);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container cp = this.getContentPane();
cp.setLayout(new FlowLayout());
custNameLabel = new JLabel(" 用 户 名 ");//创建第一个标签和文本框
cp.add(custNameLabel);
custNameTextField = new JTextField(10);
cp.add(custNameTextField);
codeLabel = new JLabel(" 输 入 密 码 ");//创建第二个标签和文本框
cp.add(codeLabel);
codeNameTextField = new JTextField(10);
cp.add(codeNameTextField);
recodeLabel = new JLabel("再 次 输 入 密 码");//创建第三个标签和文本框
cp.add(recodeLabel);
recodeNameTextField= new JTextField(10);
cp.add(recodeNameTextField);
//创建按钮
confirmButton = new JButton("注册");
confirmButton.addActionListener(this);
cp.add(confirmButton);
cancelButton = new JButton("取消");
cp.add(cancelButton);
cancelButton.addActionListener(this);
}
public void actionPerformed(ActionEvent e) {
if(e.getActionCommand().equals("注册")){
// 1. 从各个控件收集用户输入的数据
String cusName = custNameTextField.getText();//字符串
String code = codeNameTextField.getText();//字符串
String recode = recodeNameTextField.getText();//字符串
//2. 检测字段是否为空
if(cusName.equals("")){
JOptionPane.showMessageDialog(getContentPane(), "请填写用户名！",
"信息提示框", JOptionPane.INFORMATION_MESSAGE);
return ;
}
else if(code.equals("")){
JOptionPane.showMessageDialog(getContentPane(), "密码不能为空！",
"信息提示框", JOptionPane.INFORMATION_MESSAGE);
return ;
}
else if(recode.equals("")){
JOptionPane.showMessageDialog(getContentPane(), "必须重复输入密码！",
"信息提示框", JOptionPane.INFORMATION_MESSAGE);
return ;
}
//3.合法性检查
int length = code.length();
if(!(length >= 6 && length <= 10)){
JOptionPane.showMessageDialog(getContentPane(), "密码格式错误！",//密码长度限定
"信息提示框", JOptionPane.INFORMATION_MESSAGE);
return ;
}
if (!recode.equals(code)) 
JOptionPane.showInputDialog(confirmButton, "两次密码不一致，请重新输入");
//4. 连接数据库，构造insert语句，向数据库中插入记录，关闭与数据库的连接
Connection conn = JDBCutil.getConn();
String sql = "insert into information(cusName,code,recode) values(?,?,?)";
PreparedStatement preStmt=null;
try {
preStmt= conn.prepareStatement(sql);
preStmt.setString(1, cusName);
preStmt.setString(2, code);
preStmt.setString(3, recode);
//显示信息提示框
int i = -1;
i = preStmt.executeUpdate();//如果小于1表示插入失败
if(i >= 1)//显示数据插入成功，并清除字段
JOptionPane.showMessageDialog(confirmButton, "注册成功！");
else
JOptionPane.showMessageDialog(confirmButton, "注册失败！（账号或密码已存在） 
");
preStmt.executeUpdate();
System.out.println("成功插入数据"+ preStmt.getUpdateCount() + "条");
} catch (SQLException e1) {
e1.printStackTrace();
}finally{
JDBCutil.closeConn(preStmt,conn);
}
//5. 如插入成功，提示用户新增成功，并清空字段。插入不成功，提示新增失败
}else{
HomeWork6.this.dispose(); 
}
}
public static void main(String[] args){
HomeWork6 insert = new HomeWork6();
insert.setVisible(true);
}
}