注册界面有误怎么修改？(语言-java)

Question

这个是注册界面

package page;

import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.ImageIcon;
import javax.swing.SwingConstants;

import Dao.UserDao;
import Dao.UserDao2;
import Model.User;

import java.awt.Font;
import java.awt.Image;

import javax.swing.JTextField;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.Toolkit;

public class Register {

    private JFrame frame;
    private JTextField username;
    private JTextField password;
    private JTextField password_c;
    private JLabel lblNewLabel;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    Register window = new Register();
                    window.frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the application.
     */
    public Register() {
        initialize();
        //让窗口显示
        frame.setVisible(true);
        
    }

    /**
     * Initialize the contents of the frame.
     */
    private void initialize() {
        frame = new JFrame();
        frame.setTitle("\u6CE8\u518C\u9875\u9762");
        frame.setIconImage(Toolkit.getDefaultToolkit().getImage(Register.class.getResource("/image/background1.png")));
        frame.setBounds(100, 100, 599, 448);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().setLayout(null);
        
        
        JLabel lblNewLabel_1 = new JLabel("\u7528\u6237\u540D");
        lblNewLabel_1.setFont(new Font("隶书", Font.BOLD, 24));
        lblNewLabel_1.setHorizontalAlignment(SwingConstants.CENTER);
        lblNewLabel_1.setBounds(76, 44, 139, 51);
        frame.getContentPane().add(lblNewLabel_1);
        
        username = new JTextField();
        username.setBounds(252, 48, 252, 51);
        frame.getContentPane().add(username);
        username.setColumns(10);
        
        JLabel label = new JLabel("\u5BC6  \u7801");
        label.setHorizontalAlignment(SwingConstants.CENTER);
        label.setFont(new Font("隶书", Font.BOLD, 24));
        label.setBounds(76, 105, 139, 51);
        frame.getContentPane().add(label);
        
        password = new JTextField();
        password.setColumns(10);
        password.setBounds(252, 109, 252, 51);
        frame.getContentPane().add(password);
        
        JLabel label_1 = new JLabel("\u786E\u8BA4\u5BC6\u7801");
        label_1.setHorizontalAlignment(SwingConstants.CENTER);
        label_1.setFont(new Font("隶书", Font.BOLD, 24));
        label_1.setBounds(76, 175, 139, 51);
        frame.getContentPane().add(label_1);
        
        password_c = new JTextField();
        password_c.setColumns(10);
        password_c.setBounds(252, 170, 252, 51);
        frame.getContentPane().add(password_c);
        
        JButton btnNewButton = new JButton("\u6CE8  \u518C");
        btnNewButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
            //获取密码框和确认密码框，看是否相同
                String password_v = password.getText();
                String password_c_v = password_c.getText();
                if(password_v.equals(password_c_v));{
                //弹出框，提示用户输入的两次密码不相等
                JOptionPane.showMessageDialog(null,"两次输入密码不相同");
                return;
            } 
//【下面这一行是报错的地方】
                String username_v = username.getText();  
                
                int id = new UserDao2().getMaxId();        
                //将参数拼接成对象
                User u = new User(id+1,username_v,password_v);
                //执行插入操作
                boolean f = new UserDao2().insert(u);
                if(f) {
                    JOptionPane.showMessageDialog(null,"插入数据成功");
                    //让注册窗口消失
                    frame.setVisible(false);
                }
                else {
                    JOptionPane.showMessageDialog(null,"插入数据失败");
                }
        
                
            }
        });
        btnNewButton.setFont(new Font("隶书", Font.BOLD, 25));
        btnNewButton.setBounds(288, 244, 178, 51);
        frame.getContentPane().add(btnNewButton);
        
        lblNewLabel = new JLabel("New label");
        lblNewLabel.setIcon(new ImageIcon(Register.class.getResource("/image/background1.png")));
        lblNewLabel.setBounds(10, 10, 561, 388);
        frame.getContentPane().add(lblNewLabel);
    }
}

这里是把数据库的数据导入

package Dao;
import java.sql.*;
import java.util.ArrayList;

import Model.User;
import Model.User2;
import utility.DBHelper;
public class UserDao2 {
    private Connection conn;//数据库连接对象
    String sql ;//定义SQL语句
    PreparedStatement ps;//预处理表达式对象
    ResultSet rs;//查询语句执行后返回的结果集合
    public UserDao2() {
        super();
        // TODO Auto-generated constructor stub
        //初始化数据库连接对象
        conn = DBHelper.getConnection();
    }
    
    //定义方法，执行SQL语句，并处理数据库返回的内容
    public ArrayList getAll() {
        //定义一个无条件查询的SQL语句
        sql = "delect * from tb_user2 ";
        //初始化一个容器类数组列表
        ArrayList list = new ArrayList();
        //产生一个可以执行SQL语句预处理表达式对象
        try {
            ps = conn.prepareStatement(sql);
            //让预处理表达式对象执行查询语句
            rs = ps.executeQuery();


            //逐行逐字段的拆开结果中的内容
            while (rs.next()) {
            //拆分结果集中的某一行
            int id = rs.getInt("id");
            String username = rs.getString("username");
            String password = rs.getString("password");
            //将一行数据库的多个字段的值打包放入一个对象当中
            User u = new User(id,username,password);
            //用一个容器将每次产生的对象保存起来
            list.add(u);
        }
            
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
        return list;
    } 
    //定义插入语句
    public boolean insert(User u) {
        sql = "insert into tb_user2(id,username,password) valuse(?,?,?)";
        try {
            ps = conn.prepareStatement(sql);
            ps.setInt(1, u.getId());
            ps.setString(2, u.getUsername());
            ps.setString(2, u.getPassword());
            //执行插入语句
            int i = ps.executeUpdate();
            if(i>0) return true;
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return false;
    }
    //定义删除语句
    public boolean delete(int id) {
        sql = "delect from tb_user2 where id=?";
        try {
            ps = conn.prepareStatement(sql);
            ps.setInt(1,id);
            int i = ps.executeUpdate();
            if(i>0) return false;
            
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return false;
    }
    //定义一个修改语句
    public boolean update(User2 u) {
        sql = "update tb-user set number=?,category=?,price=?,chandi=? where id=?";
        try {
            ps = conn.prepareStatement(sql);
            ps.setString(1, u.getUsername());
            ps.setString(1, u.getPassword());
            
            //设置后面两个参数的值
            ps.setInt(2, u.getId());
            ps.setString(2, u.getUsername());
            ps.setString(1, u.getPassword());
        
            int i = ps.executeUpdate();
            if(i>0) return true;
            
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return false;
    }
    //定义按条件查询的SQL语句
    public ArrayList getUsers(String column,String value) {
        sql = "selsect * from tb_user where "+column+" like '%"+value+"%'";
        System.out.println("sql:"+sql);
        ArrayList list = new ArrayList();
        try {
            ps = conn.prepareStatement(sql);
            rs = ps.executeQuery();
            
            //逐行逐字段的拆开结果中的内容
            while (rs.next()) {
            //拆分结果集中的某一行
            int id = rs.getInt("id");
            String username = rs.getString("username");
            String password = rs.getString("password");
            
            //将一行数据库的多个字段的值打包放入一个对象当中
            User u = new User(id,username,password);
            //用一个容器将每次产生的对象保存起来
            list.add(u);
        }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return list;
    }
    //获取该表最大的id值
    public int getMaxId() {
        sql = "select max(id) as id from tb_user2";
        //获取一个可以执行SQL语句的对象
        try {
            ps = conn.prepareStatement(sql);
            //执行SQL语句
            rs = ps.executeQuery();
            if(rs.next()) {
                return rs.getInt("id")+1;
            }
            
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return 1;
    }
    //根据用户名和密码判断登录是否成功
    public boolean login(String username,String password) {
    sql = "select * from tb_user2 where username=? and password=?";
    try {
        ps = conn.prepareStatement(sql);
        //设置问号里面的参数
        ps.setString(1, username);
        ps.setString(2, password);
        rs = ps.executeQuery();
        if(rs.next())return true;
        
        
    } catch (SQLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
       return false; 
    }
}

这是数据库的数据

这是注册页面的图片

请问我报错的地方该怎么修改

Answer 1

这里的分号去掉