2018-09-08（连接数据库的一个登陆小窗口）

今天研究了一下登陆窗口创建
如果是我自己什么都不看，那么我想到什么？
jdbc技术，数据的读入，数据的输出，窗口搭建的awt
首先创建一个数据库，搭建一个表，然后表与ecplice链接
创建一个数据库，然后创建一个表，表中有scores，name，password

//创建表的语言
//在数据库中定义一个info库，然后库里边添加player表
create database info;
use info;
create table player(scores int(11),
name char(10),password char(10));

建立一个类链接数据库

package dates;  

import java.sql.Connection;  
import java.sql.DriverManager;  
import java.sql.SQLException;  
import java.sql.Statement;  

public class MyDBConnection{<span style="font-family: Arial, Helvetica, sans-serif;">//连接类</span>  

    private String DBDriver;  
    private String DBURL;  
    private String DBUser;  
    private String DBPass;  
    private Connection conn=null;  
    private Statement stmt=null;  
    public MyDBConnection(){  
        DBDriver="com.mysql.jdbc.Driver";  
        DBURL="jdbc:mysql://localhost:3306/info";  
        DBUser="root";//用户名  
        DBPass="473721601";//数据库密码  
        try{  
            Class.forName(DBDriver);//加载驱动程序  
            //System.out.println("数据库驱动程序加载成功");  
        }catch(Exception e){  
            e.printStackTrace();  
        }  
        try{  
            conn=DriverManager.getConnection(DBURL,DBUser,DBPass);//取得连接对象  
            stmt=conn.createStatement();//取得SQL语句对象  
            System.out.print("连接数据库成功");  
        }catch(Exception e){  
            e.printStackTrace();  
        }  
    }  
    public Connection getMyConnection(){  
        return conn;  
    }  
    public Statement getMyStatement(){  
        return stmt;  
    }  
    public void closeMyConnection(){//关闭数据库连接  
        try{  
            stmt.close();  
            conn.close();  
        }catch(SQLException e){  
            e.printStackTrace();  
        }  
    }  
    public String toString(){  
        return "数据库驱动程序"+DBDriver+"，链接地址"+DBURL+"，用户名"+DBUser+"，密码"+DBPass;  
    }  
}

操作类代码，进行增删改查以及匹配

package dates;  
import java.sql.Connection;  
import java.sql.ResultSet;  
import java.sql.SQLException;  
import java.sql.Statement;  
import java.util.ArrayList;  
import java.util.Arrays;  
import java.util.Collections;  
import java.util.List;  
public class DBOperation{  
    private MyDBConnection myDB=null;  
    private Connection conn=null;  
    private Statement stmt=null;  
    private int scores;  
    private int number1=0;  
    private int number2=0;  
    private String name;  
    private String password;  
    public DBOperation(MyDBConnection myDB){  
        conn=myDB.getMyConnection();//取得对象  
        stmt=myDB.getMyStatement();//取得sql语句  
    }  
    public void insertData(String name,String password,int scores){  
        try{  
            String newType1=new String(name.getBytes(),"GBK");//字节转码  
            String newType2=new String(password.getBytes(),"GBK");  
            String sql="INSERT INTO player(scores,name,password)VALUES
            ("+scores+",'"+newType1+"','"+newType2+"')";  
            stmt.executeUpdate(sql);//更新语句  
        }catch(Exception e1){  
            e1.printStackTrace();  
        }  
    }  
    public void deleteData(int scores){  
        String sql="DELETE FROM player WHERE scores="+scores+"";  
        System.out.print(sql);  
        try{  
            stmt.executeUpdate(sql);  
            //System.out.println("一条记录被删除");  
        }catch(SQLException e){  
            e.printStackTrace();  
        }  
    }  
    public void updateData(int mscores,int scores,String name,String password){//修改  
        String sql="UPDATE player SET scores="+scores+",name='"+name+"'
        &&password='"+password+"'";  
        try{  
            stmt.executeUpdate(sql);  
        }catch(SQLException e){  
            e.printStackTrace();  
        }  
    }  
    public boolean  selectPassword(String mpassword){//查询密码  
        String sql="SELECT scores,name,password FROM player";  
        try{  
            ResultSet rs=stmt.executeQuery(sql);//返回结果集  
            while(rs.next()){//指针向后移动  
                password=rs.getString("password");  
                number2++;  
                //System.out.print(rs.getString("password")+"  ");  
                if(password.equals(mpassword)&&(number2==number1)){  
                    //System.out.print("number2:"+number2);  
                    return true;  
                }  
            }  

        }catch(Exception e){  
            e.printStackTrace();  
        }  
        return false;  
    }  
    public boolean selectName(String mname){//查询id  
        String sql="SELECT scores,name,password FROM player";  
        try{  
            ResultSet rs=stmt.executeQuery(sql);//返回结果集  
            while(rs.next()){//指针向后移动  
                name=rs.getString("name");  
                number1++;  
                if(name.equals(mname)){  
                    //System.out.print("number1:"+number1);  
                    return true;  
                }  
            }  


        }catch(Exception e){  
            e.printStackTrace();  
        }  
        return false;  
    }  
    public int getScores(){  
        return scores;  
    }  
    public String getName(){  
        return name;  
    }  
    public String getPassword(){  
        return password;  
    }  

    public void setNumber1(){  
        number1=0;  
    }  
    public void setNumber2(){  
        number2=0;  
    }  
}

然后登陆界面

package ui;  

import java.awt.Button;  
import java.awt.Color;  
import java.awt.Font;  
import java.awt.Graphics;  
import java.awt.Image;  
import java.awt.event.*;  
import java.io.File;  
import java.io.IOException;  

import javax.imageio.ImageIO;  
import javax.swing.*;  

import dates.DBOperation;  
import dates.MyDBConnection;  

public class Window implements MouseListener {  

    public JFrame frame = new JFrame("登录窗口");  
    private JLabel label1=new JLabel("游戏id:");  
    private JTextField txt1=new JTextField();  
    private JLabel label2=new JLabel("密   码:");  
    private JTextField txt2=new JTextField();  
    private JButton btn1=new JButton("登陆");  
    private JButton btn2=new JButton("注册");  
    private JButton btn3=new JButton("退出");  
    private String text1;  
    private String text2;  
    private int distinguish;//用来记录鼠标悬停在哪个位置  
    MyDBConnection myDB=new MyDBConnection(DBDriver,DBURL,DBUser,DBPass);  
    public DBOperation myOpr=new DBOperation(myDB);  
    public Window(){  

    }  

    public void show(){  
        frame.setLayout(null);//定义空布局  
        frame.setSize(470,300);  
        frame.setLocation(400, 200);  

        Font font=new Font("华文行楷",Font.BOLD,20);  
        label1.setFont(font);  
        label1.setForeground(Color.gray);//设置字体颜色  
        label2.setFont(font);  

        label2.setForeground(Color.gray);  
        txt1.setOpaque(false);//设置文本框透明  
        txt2.setOpaque(false);  

        btn1.setContentAreaFilled(false);//设置button组件透明  
        btn1.setFont(font);  
            btn1.setForeground(Color.gray);  
            btn1.setBorder(BorderFactory.createRaisedBevelBorder());//设置突出button组件  
            btn2.setContentAreaFilled(false);  
        btn2.setFont(font);  
        btn2.setBorder(BorderFactory.createRaisedBevelBorder());  
            btn2.setForeground(Color.gray);  
            btn3.setContentAreaFilled(false);  
        btn3.setFont(font);  
        btn3.setBorder(BorderFactory.createRaisedBevelBorder());  
            btn3.setForeground(Color.gray);  
        JPanel bj = new JPanel() {//设置背景  
            protected void paintComponent(Graphics g) {  
                Image bg;  
                try {  
                    bg = ImageIO.read(new File("src/image/开始背景.PNG"));  
                    g.drawImage(bg, 0, 0, getWidth(), getHeight(), null);  
                } catch (IOException e) {  
                    e.printStackTrace();  
                }  
            }  
        };  

           label1.setBounds(100,50,100,100);  
        txt1.setBounds(180,90, 150, 20);  
        label2.setBounds(100,80,100,100);  
        txt2.setBounds(180,120, 150, 20);  
        btn1.setBounds(100,200,80,20);  
        btn2.setBounds(190,200,80,20);  
        btn3.setBounds(280,200,80,20);  
        frame.setContentPane(bj);  
        frame.setLayout(null);  
        frame.add(label1);  
        frame.add(txt1);  
        frame.add(label2);  
        frame.add(txt2);  
        frame.add(btn1);  
        frame.add(btn2);  
        frame.add(btn3);  
        btn1.addMouseListener(this);//添加鼠标监听  
        btn2.addMouseListener(this);  
        btn3.addMouseListener(this);  
        frame.setVisible(true);   
    }  

    public void mouseClicked(MouseEvent arg0) {  
       text1=txt1.getText();//获取用户输入数据  
       text2=txt2.getText();  
       if(distinguish==1){  
       if(myOpr.selectName(text1)){//登录判断  
           if(myOpr.selectPassword(text2)){  
               JOptionPane.showMessageDialog(null, "登陆成功","提示",2);  
                txt1.setText("");  
                txt2.setText("");  
                distinguish=4;  
                frame.setVisible(false);//登录成功则关闭界面  
           }else{  
                JOptionPane.showMessageDialog(null, "密码错误","提示",2);  
                txt2.setText("");  
                myOpr.setNumber1();//密码错误将number置0  
                myOpr.setNumber2();  
           }  
       }else{  
           JOptionPane.showMessageDialog(null, "此id不存在，请注册","提示",2);  
            txt1.setText("");  
            txt2.setText("");  
       }  
       }  
       if(distinguish==2){  

           String logi=(String) JOptionPane.showInputDialog
           (null,"请输入你的id：\n","注册",JOptionPane.PLAIN_MESSAGE,null,null,"在这输入");   
           String pas=(String) JOptionPane.showInputDialog
           (null,"请输入你的密码：\n","注册",JOptionPane.PLAIN_MESSAGE,null,null,"在这输入");  
            myOpr.insertData(logi,pas,0);  
            JOptionPane.showMessageDialog(null, "注册成功","提示",2);  
       }  
       if(distinguish==3){  
           int n = JOptionPane.showConfirmDialog
           (null, "是否退出?", "游戏结束",JOptionPane.YES_NO_OPTION);  
           myDB.closeMyConnection();  
            if(n==JOptionPane.YES_OPTION){  
            System.exit(1);  
            }  
       }  

    }  

    public void mouseEntered(MouseEvent arg0) {  
        if (arg0.getSource() == btn1) {  
            distinguish=1;//鼠标悬停在btn1处则把distinguish置1  
            btn1.setForeground(Color.red);//改变颜色  
            btn1.setBorder(BorderFactory.createLoweredBevelBorder());//组件凹陷  
            btn2.setForeground(Color.gray);  
            btn2.setBorder(BorderFactory.createRaisedBevelBorder());  
            btn3.setForeground(Color.gray);  
            btn3.setBorder(BorderFactory.createRaisedBevelBorder());  
        }  
        if (arg0.getSource() == btn2) {  
            distinguish=2;  
            btn1.setForeground(Color.gray);  
            btn1.setBorder(BorderFactory.createRaisedBevelBorder());  
            btn2.setForeground(Color.red);  
            btn2.setBorder(BorderFactory.createLoweredBevelBorder());  
            btn3.setForeground(Color.gray);  
            btn3.setBorder(BorderFactory.createRaisedBevelBorder());  
        }  
        if (arg0.getSource() == btn3) {  
            distinguish=3;  
            btn1.setForeground(Color.gray);  
            btn1.setBorder(BorderFactory.createRaisedBevelBorder());  
            btn2.setForeground(Color.gray);  
            btn2.setBorder(BorderFactory.createRaisedBevelBorder());  
            btn3.setForeground(Color.red);  
            btn3.setBorder(BorderFactory.createLoweredBevelBorder());  
            }  

    }  
    public void mouseExited(MouseEvent arg0) {//鼠标退出三个button组件后恢复  
        distinguish=0;  
        label1.setForeground(Color.gray);  
        label2.setForeground(Color.gray);  
        txt1.setOpaque(false);  
        txt2.setOpaque(false);  
        btn1.setContentAreaFilled(false);  
        btn1.setForeground(Color.gray);  
        btn1.setBorder(BorderFactory.createRaisedBevelBorder());  
        btn2.setContentAreaFilled(false);  
        btn2.setBorder(BorderFactory.createRaisedBevelBorder());  
        btn2.setForeground(Color.gray);  
        btn3.setContentAreaFilled(false);  
        btn3.setBorder(BorderFactory.createRaisedBevelBorder());  
        btn3.setForeground(Color.gray);  
    }  

    public void mousePressed(MouseEvent arg0) {  

    }  
    public void mouseReleased(MouseEvent arg0) {  


    }  
    public String getText1(){  
        return text1;  
    }  
    public String getText2(){  
        return text2;  
    }  
    public int getDistinguish(){  
        return distinguish;  
    }  

}

2018-09-08（连接数据库的一个登陆小窗口）

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