Java课程设计：基于Javaweb的校园订餐系统

文章目录

一、项目介绍
二、项目技术栈
三、核心代码
四、项目展示
五、源码获取

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();}	
}