60.【贪吃的球球存档操作】

工具类:

import java.sql.*;
import java.util.Vector;

public class Util {
    //链接数据库工具包
    public static Connection getConnection(){
        Connection cn=null;
        try {
            Class.forName("org.gjt.mm.mysql.Driver");
            try {
                 cn= DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/grame_snack_greed","root","121788");
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
        } catch (ClassNotFoundException classNotFoundException) {
            classNotFoundException.printStackTrace();
        }
        return cn;
    }
    //搜素数据库信息
    public static ResultSet Select(String sql, Vector v){
        ResultSet rs=null;
        try {
            Connection cn=getConnection();
            PreparedStatement ps=cn.prepareStatement(sql);
            for(int i=0;i<v.size();i++){
                ps.setString(i+1,v.get(i).toString());
            }
            rs=ps.executeQuery();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
        return rs;
    }
    //增删改 工具包
    public static int Updata(String sql,Vector v){
        int n=0;
        try {
            PreparedStatement ps=getConnection().prepareStatement(sql);
            for(int i=0;i<v.size();i++){
                ps.setString(i+1,v.get(i).toString());
            }
            n=ps.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return n;
    }//进行改查删的操作
}

JAVABEAN类

import java.awt.*;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.sql.*;
import java.util.Random;
import java.util.Vector;

public class panel extends Panel implements KeyListener {
    //设置角色坐标 以及 大小
    int index_x;
    int index_y;
    int width;
    int height;
    //设置食物坐标 以及 大小
    int food_x;
    int food_y;
    int food_width;
    int food_height;
    //利用构造函数获取数据库  角色  以及 食物  的初始化 数据
    public panel(){
        try {
           Connection cn=Util.getConnection();
            Statement st=cn.createStatement();
            ResultSet rs=st.executeQuery("select *from information");
            while (rs.next()){
                index_y=rs.getInt(1);
                index_y=rs.getInt(2);
                width=rs.getInt(3);
                height=rs.getInt(4);
                food_x=rs.getInt(5);
                food_y=rs.getInt(6);
                food_width=rs.getInt(7);
                food_height=rs.getInt(8);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
   //引用画笔 函数，画出角色和食物
    public void paint(Graphics g){
        g.fillOval(index_x,index_y,width,height);
        g.fillOval(food_x,food_y,food_width,food_height);
    }

    //键盘事件
    @Override
    public void keyTyped(KeyEvent e) {

    }

    @Override
    public void keyPressed(KeyEvent e) {
        //移动操作的键盘
        if(e.getKeyChar()=='a'||e.getKeyCode()==37){
          index_x=index_x-10;
       }if(e.getKeyChar()=='w'||e.getKeyCode()==38){
          index_y=index_y-10;
       }if(e.getKeyChar()=='d'||e.getKeyCode()==39){
          index_x=index_x+10;
       }if(e.getKeyChar()=='s'||e.getKeyCode()==40){
          index_y=index_y+10;
          //假如吃到食物，角色和食物 进行转变
       }if(index_x<=food_x&&index_x+width>=food_x&&index_y<=food_y&&index_y+height>=food_y){
           Random r=new Random();
           width=width+10;
           height=height+10;
           food_x=r.nextInt(700)+1;
           food_y=r.nextInt(700)+1;
        }
        //更新数据库的数据
        String sql="update information set index_x=?,index_y=?,width=?,height=?,food_x=?,food_y=?,food_width=?,food_height=?";
        Vector v=new Vector();
        v.add(index_x);
        v.add(index_y);
        v.add(width);
        v.add(height);
        v.add(food_x);
        v.add(food_y);
        v.add(food_width);
        v.add(food_height);
        int n= Util.Updata(sql,v);
     //   System.out.println(n);
      repaint();
    }

    @Override
    public void keyReleased(KeyEvent e) {

    }
}

测试类:

import java.awt.*;
public class test {
    public static void main(String[] args) {
    Frame f=new Frame("键盘事件");
    f.setSize(800,800);
    f.setLocationRelativeTo(null);
    panel p=new panel();
    f.add(p);
    f.addKeyListener(p);
    p.addKeyListener(p);
    f.setVisible(true);
    }
}

数据库初始化信息

create table Information(
index_x int not null,
index_y int not null,
width int not null,
height int not null,
food_x int not null,
food_y int not null,
food_width int  not null,
food_height int not null
);
insert into information values(20,20,50,50,30,30,20,20);