JAVA实现JWT注册窗口,且手撸操作mysql数据库

稳之楠

1、JWT注册窗口

package bysj_wzc.cilent;


import java.awt.*;
import javax.swing.*;

import bysj_wzc.cilent.ClientReadAndPrint.OpenRegisterListen;

//注册类
public class Register {
    JTextField textField = null;
    JPasswordField pwdField = null;
    ClientReadAndPrint.RegisterListen listener=null;
    ClientReadAndPrint.OpenLoginListen openLgLt=null;
    
    // 构造函数
    public Register() {
        init();
    }
    
    void init() {
        JFrame jf = new JFrame("注册");
        jf.setBounds(500, 250, 310, 210);
        jf.setResizable(false);  // 设置是否缩放
        
        JPanel jp1 = new JPanel();
        JLabel headJLabel = new JLabel("注册界面");
        headJLabel.setFont(new Font(null, 0, 35));  // 设置文本的字体类型、样式 和 大小
        jp1.add(headJLabel);
        
        JPanel jp2 = new JPanel();
        JLabel nameJLabel = new JLabel("用户名:");
        textField = new JTextField(20);
        JLabel pwdJLabel = new JLabel("密码:    ");
        pwdField = new JPasswordField(20);
        JButton registerBtn = new JButton("注册");
        JButton loginBtn = new JButton("有账号?登录");
        jp2.add(nameJLabel);
        jp2.add(textField);
        jp2.add(pwdJLabel);
        jp2.add(pwdField);
        jp2.add(registerBtn);
        jp2.add(loginBtn);
        
        JPanel jp = new JPanel(new BorderLayout());  // BorderLayout布局
        jp.add(jp1, BorderLayout.NORTH);
        jp.add(jp2, BorderLayout.CENTER);
        
        // 设置监控
        listener = new ClientReadAndPrint().new RegisterListen();  // 新建监听类
        listener.setJTextField(textField);  // 调用PoliceListen类的方法
        listener.setJPasswordField(pwdField);
        listener.setJFrame(jf);
        pwdField.addActionListener(listener);  // 密码框添加监听
        registerBtn.addActionListener(listener);  // 按钮添加监听
        
        // 设置打开登录监控
        openLgLt = new ClientReadAndPrint().new OpenLoginListen();  // 新建监听类
        openLgLt.setJFrame(jf);
        loginBtn.addActionListener(openLgLt);  // 按钮添加监听
        
        jf.add(jp);
        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  // 设置关闭图标作用
        jf.setVisible(true);  // 设置可见
    }
}

2、监听类

/**********************注册监听(内部类)**********************/
    class RegisterListen implements ActionListener{
        JTextField textField;
        JPasswordField pwdField;
        JFrame registerJFrame;  // 注册窗口
        
        Login login = null;
        
        public void setJTextField(JTextField textField) {
            this.textField = textField;
        }
        public void setJPasswordField(JPasswordField pwdField) {
            this.pwdField = pwdField;
        }
        public void setJFrame(JFrame jFrame) {
            this.registerJFrame = jFrame;
        }
        public void actionPerformed(ActionEvent event) {
            userName = textField.getText();
            String userPwd = String.valueOf(pwdField.getPassword());  // getPassword方法获得char数组
            //通过账号密码注册
            int i = DBUtils.addData(userName, userPwd);
            if(i == -1) {
                JOptionPane.showMessageDialog(registerJFrame, "已有此账号,请勿重复注册!", "提示", JOptionPane.WARNING_MESSAGE);
                return;
            }else if(i == 0) {
                JOptionPane.showMessageDialog(registerJFrame, "注册失败,请查验参数是否超过大小", "提示", JOptionPane.WARNING_MESSAGE);
                return;
            }else {
                JOptionPane.showMessageDialog(registerJFrame, "添加成功!", "提示", JOptionPane.WARNING_MESSAGE);
            }
            try {
                Thread.sleep(1500);
            }catch(Exception e) {
                e.printStackTrace();
            }
            
            login = new Login();  // 新建登录窗口
            registerJFrame.setVisible(false);  // 隐藏注册窗口
        }
    }
    
    /**********************切换注册页面监听(内部类)**********************/
    class OpenRegisterListen implements ActionListener{
        JTextField textField;
        JPasswordField pwdField;
        JFrame loginJFrame;  // 登录窗口
        
        Register register = null;
        
        public void setJTextField(JTextField textField) {
            this.textField = textField;
        }
        public void setJPasswordField(JPasswordField pwdField) {
            this.pwdField = pwdField;
        }
        public void setJFrame(JFrame jFrame) {
            this.loginJFrame = jFrame;
        }
        public void actionPerformed(ActionEvent event) {
            register = new Register();  // 新建注册窗口
            loginJFrame.setVisible(false);  // 隐藏登录窗口
        }
    }

3、数据库操作

package bysj_wzc.util;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;

public class DBUtils {
    // 加载数据库驱动  com.mysql.jdbc.Driver
    private static String dbdriver = "com.mysql.cj.jdbc.Driver";  //因为MySQL是8.0版本,所以需要加上cj,如果是5.0版本就不用
    // 获取mysql连接地址
    private static String dburl = "jdbc:mysql://127.0.0.1:3306/databases?&useSSL=false&serverTimezone=UTC";  
            //这里的&serverTimezone=UTC很重要,之前就是因为这个出错
    // 数据名称
    private static String username = "root";
    // 数据库密码
    private static String userpassword = "admin";
    // 获取一个数据的连接
    public static Connection conn = null;
    // 获取连接的一个状态

    //下面是一个例子,其中database1是数据库名,后面是一条查询语句
    public static void main(String[] args) throws SQLException {
        System.out.println("进入");
//        List<Object> x = getDataByNameAndPsd("1", "1");
        int x = addData("44", "44");
        System.out.println(x);
    }
    
    /**
     * 获取用户数据通过账号
     * @param userName 账号
     * @return
     */
    public static List<Object> getDataByName(String userName) {
        List<Object> data = getData("bysj",
                "select * from user where user_name = ?", userName);
        return data;
    }
    
    /**
     * 获取用户数据通过账号和密码
     * @param userName 账号
     * @param password 密码
     * @return
     */
    public static List<Object> getDataByNameAndPsd(String userName, String password) {
        List<Object> data = getData("bysj",
                "select * from user where user_name = ? and password = ?", userName, password);
        return data;
    }
    
    /**
     * 获取用户数据通过账号和密码
     * @param userName 账号
     * @param password 密码
     * @return
     */
    public static int addData(String userName, String password) {
        //先查询数据库是否已经有此账号
        List<Object> data = getDataByName(userName);
        if(data != null && data.size() > 0) {
            return -1;// -1 代表着数据库已经有次账号,无法继续添加
        }
        /*执行插入*/
        //获取用户主键
        String id = UUID.randomUUID().toString().replaceAll("-", "");
        //执行添加方法
        int count = operateData("bysj",
                "insert into user(id, user_name, password) values(?,?,?)", id, userName, password);
        return count;
    }
    

    /**
     * 获取数据库连接
     * 
     * @param mydbName
     * @return
     */
    private static Connection getConn(String mydbName) {
        Connection conn = null;
        try {
            Class.forName(dbdriver);            
            String myjdbcUrl = dburl.replace("databases", mydbName);
            conn = DriverManager.getConnection(myjdbcUrl, username, userpassword);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return conn;
    }
    /**
     * 关闭数据库连接
     * 
     * @param rs
     * @param ps
     * @param conn
     */
    private static void closeAll(ResultSet rs, PreparedStatement ps,
            Connection conn) {
        if (rs != null) {
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (ps != null) {
            try {
                ps.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (conn == null)
            return;
        try {
            conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    
    /**
     * 查表,返回行的列表,每个列表中包含列的列表。
     * 
     * @param dbName
     * @param sql
     * @return
     */
    public static List<Object> getData(String dbName, String sql, String ...param) {
        Connection conn = getConn(dbName);
        PreparedStatement ps = null;
        List<Object> list = new ArrayList<Object>();
        ResultSet rs = null;
        try {
            ps = conn.prepareStatement(sql);
            //如果有传参
            if(param != null) {
                for(int i = 0;i < param.length;i++) {
                    ps.setString(i+1, param[i]);
                }
            }
            rs = ps.executeQuery();
            ResultSetMetaData md = rs.getMetaData();
            int columnCount = md.getColumnCount();
            while (rs.next()) {
                for (int i = 1; i <= columnCount; ++i) {
                    Object o = rs.getObject(i) == null ? "" : rs.getObject(i);
                    list.add(o);
                }
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            closeAll(rs, ps, conn);
        }
        return list;
    }
    
    /**
     * 添加/修改数据
     * 
     * @param dbName 数据库名称
     * @param sql
     * @return
     */
    public static int operateData(String dbName, String sql, String ...param) {
        Connection conn = getConn(dbName);
        PreparedStatement ps = null;
        int rs = 0;
        try {
            ps = conn.prepareStatement(sql);
            //如果有传参
            if(param != null) {
                for(int i = 0;i < param.length;i++) {
                    ps.setString(i+1, param[i]);
                }
            }
            rs = ps.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            try {
                ps.close();
                conn.close();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        return rs;
    }
}
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