一、项目介绍

在当今互联网高速发展的时代,大学校园内的学生生活正在发生着翻天覆地的变化。其中,校园内的餐饮服务无疑是亟需改革和创新的领域之一。

传统的校园食堂模式,往往存在就餐高峰时段拥挤、菜品选择单一、订餐流程繁琐等诸多问题,严重影响了学生的就餐体验。为了解决这一痛点,迫切需要开发一套功能全面、操作简便的校园订餐系统。

二、项目技术栈

• 后端：javaweb+jdk+tomcat
• 前端：jsp+css+js
• 数据库：mysql

三、核心代码

验证码生产类

public class CheckCode {

	public String getCheckCode(){
		Random random = new Random();
		String sRand="";
		for (int i=0;i<4;i++){
	    String rand=String.valueOf(random.nextInt(10));
	    sRand+=rand;
		}
	    return sRand;
	}
}

管理员登录

public int adminLogin(String username,String md5password,String password,String useros,String loginip){
		String sql = "select * from admin where username = '"+username+"' and isuse='1'";
		String sql2 = "insert into adminlog(username,password,logintime,loginip,useros,ok) values('"+username+"','"+md5password+"','"+date+"','"+loginip+"','"+useros+"','true')";
		String sql3 = "insert into adminlog(username,password,logintime,loginip,useros,ok) values('"+username+"','"+password+"','"+date+"','"+loginip+"','"+useros+"','false')";
		String sql4 = "update admin set logintimes = logintimes+1 where username = '"+username+"' ";
		DBO dbo = new DBO();
		String pwd;
		dbo.open();
		try{
			rs = dbo.executeQuery(sql);
			if(rs.next()){
				pwd = rs.getString("password");
				if(pwd.trim().equals(md5password)){
					dbo.executeUpdate(sql2);
					dbo.executeUpdate(sql4);
					return Constant.SUCCESS;
				}
				else{
					dbo.executeUpdate(sql3);
					return Constant.PASSWORD_ERROR;
				}
			}
			else{
				dbo.executeUpdate(sql3);
				return Constant.NAME_ERROR;
			}			
		}catch(Exception e){
			e.printStackTrace();
			return Constant.SYSTEM_ERROR;
		}finally{
			dbo.close();
		}	
	}

查询管理员信息

public List getAdminInfo(String username){
		String sql = "select * from admin where username='"+username+"' ";
		DBO dbo = new DBO();
		dbo.open();
		list = new ArrayList();
		try{
			rs = dbo.executeQuery(sql);
			rs.next();
			list.add(rs.getString("username"));
			list.add(rs.getInt("flag"));
			list.add(rs.getInt("logintimes"));
			list.add(date);
			list.add(rs.getString("quanxian"));
			return list;
		}catch(Exception e){
			e.printStackTrace();
			return list;
		}finally{
			dbo.close();
		}
	}

查询信息

//分页查询所有个人会员
	public void setEVERYPAGENUM(int EVERYPAGENUM){
    	this.EVERYPAGENUM=EVERYPAGENUM;
    }
    public int getMessageCount() { //得到信息总数
       DBO dbo=new DBO();
       dbo.open();
        try { 
            rs = dbo.executeQuery(sql);
            rs.next();
            count = rs.getInt(1);
            return count;
        } catch (SQLException ex) {
            ex.printStackTrace();
            return -1;
        } finally {
            dbo.close();
        }
    }
    public int getPageCount() { //得到共多少页（根据每页要显示几条信息）
        if (count % EVERYPAGENUM == 0) {
            return count / EVERYPAGENUM;
        } else {
            return count / EVERYPAGENUM + 1;
        }
    }
    public List getMessage(int page) { //得到每页要显示的信息
        DBO dbo=new DBO();
        dbo.open();
        List list = new ArrayList();
        try {
            rs = dbo.executeQuery(sql2);
            for (int i = 0; i < (page - 1) * EVERYPAGENUM; i++) {
                rs.next();
            }
            for (int t = 0; t < EVERYPAGENUM; t++) {
                if (rs.next()) {
                    qq++;
                    List list2=new ArrayList();
                    list2.add(rs.getInt("id"));
    				list2.add(rs.getString("username"));
    				list2.add(rs.getString("regtime"));
    				list2.add(rs.getString("ifuse"));
    				list2.add(rs.getString("logintimes"));
    				list2.add(rs.getString("lasttime"));
    				list2.add(rs.getString("lastip"));
    				list.add(list2);
                } else {
                    break; //减少空循环的时间
                }
            }
            return list;
        } catch (SQLException ex) {
            ex.printStackTrace();
            return null;
        } finally {
            dbo.close();
        }
    }

企业会员

///所有企业会员
    public int getMessageCountCO() { //得到信息总数
        DBO dbo=new DBO();
        dbo.open();
         try { 
             rs = dbo.executeQuery("select count(*) from member where type='co'");
             rs.next();
             count = rs.getInt(1);
             return count;
         } catch (SQLException ex) {
             ex.printStackTrace();
             return -1;
         } finally {
             dbo.close();
         }
     }
     public List getMessageCO(int page) { //得到每页要显示的信息
         DBO dbo=new DBO();
         dbo.open();
         List list = new ArrayList();
         try {
             rs = dbo.executeQuery("select * from member where type='co' order by id desc ");
             for (int i = 0; i < (page - 1) * EVERYPAGENUM; i++) {
                 rs.next();
             }
             for (int t = 0; t < EVERYPAGENUM; t++) {
                 if (rs.next()) {
                     qq++;
                    List list2=new ArrayList();
                    list2.add(rs.getInt("id"));
     				list2.add(rs.getString("username"));
     				list2.add(rs.getString("regtime"));
     				list2.add(rs.getString("ifuse"));
     				list2.add(rs.getString("logintimes"));
     				list2.add(rs.getString("lasttime"));
     				list2.add(rs.getString("lastip"));
     				list.add(list2);
                 } else {
                     break; //减少空循环的时间
                 }
             }
             return list;
         } catch (SQLException ex) {
             ex.printStackTrace();
             return null;
         } finally {
             dbo.close();
         }
     }
     

数据库连接类

public class DBO {

	private Connection conn;
	private Statement stmt;
  	private DataSource ds;
	
	public DBO()
	{
	}

	/**
		打开数据库
	*/
	public void open() 
	{
		try 
		{
			Class.forName("com.mysql.jdbc.Driver"); 
			conn=DriverManager.getConnection("jdbc:mysql://localhost/wsdc?useUnicode=true&characterEncoding=gb2312","root","root");
			//Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");           
			//conn = DriverManager.getConnection("jdbc:microsoft:sqlserver://localhost:1433;databasename=xwfb","sa","123");
			stmt=conn.createStatement();
			System.out.println("打开数据库连接");
		} 
		catch (Exception ex) 
		{
		System.err.println("打开数据库时出错: " + ex.getMessage());
		}
	}

	/**
		关闭数据库，将连接返还给连接池
	*/
	public void close() 
	{
		try 
		{
		
				
		//	connMgr.freeConnection("java", conn);
			conn.close();
			System.out.println ("释放连接");
		} 
		catch (SQLException ex) 
		{
			System.err.println("返还连接池出错: " + ex.getMessage());
		}
	}

	/**
		执行查询
	*/
	public ResultSet executeQuery(String sql) throws SQLException
	{
		ResultSet rs = null;
		

		rs = stmt.executeQuery(sql);
		System.out.println ("执行查询");
		return rs;
	}

	/**
		执行增删改
	*/
	public int executeUpdate(String sql) throws SQLException
	{
		int ret = 0;
		
	
		ret = stmt.executeUpdate(sql);
	
		System.out.println ("执行增删改");
		return ret;
	}

	/**
		将SQL语句加入到批处理
	*/
	public void addBatch(String sql) throws SQLException 
	{
		stmt.addBatch(sql);
	}

	/**
		执行批处理
	*/
	public int [] executeBatch() throws SQLException 
	{
		boolean isAuto=conn.getAutoCommit();
		
		conn.setAutoCommit(false);
		int [] updateCounts = stmt.executeBatch();
		
//		conn.commit();
		
//		conn.setAutoCommit(isAuto);
		//conn.setAutoCommit(true);
		return updateCounts;
	}
	public boolean getAutoCommit() throws SQLException
	{
		return conn.getAutoCommit();
	}
	public void setAutoCommit(boolean auto)  throws SQLException 
	{
		conn.setAutoCommit(auto);
	}
	
	public void commit() throws SQLException 
	{
		conn.commit();
//		this.close();
	}
	public void rollBack() throws SQLException 
	{
		conn.rollback();
//		this.close();
	}	
}

四、项目展示

登录页面

项目主页

留言管理

后台管理

五、源码获取

因为页面与源码太多了，所以页面与源码只展示了一部分，完整源码已经打包了，点击下面蓝色链接获取！

点我获取源码