小郡肝火锅点餐系统代码实现(部分)

项目结构：

Java代码实现部分：

Food.java

package bean;

import java.math.BigDecimal;

public class Food {    private int id;                //  主键    private String foodname;       //  菜名    private int type_id;           //  菜系    private  String descript;      //  描述    private BigDecimal price;             //  价格    private  int saling;           //  在售    private String img;            //图片

    public String getDescript() {        return descript;    }

    public void setDescript(String deccript) {        this.descript = deccript;    }

    public String getFoodname() {        return foodname;    }

    public void setFoodname(String foodname) {        this.foodname = foodname;    }

    public int getId() {        return id;    }

    public void setId(int id) {        this.id = id;    }

    public String getImg() {        return img;    }

    public void setImg(String img) {        this.img = img;    }

    public BigDecimal getPrice() {        return price;    }

    public void setPrice(BigDecimal price) {        this.price = price;    }

    public int getSaling() {        return saling;    }

    public void setSaling(int saling) {        this.saling = saling;    }

    public int getType_id() {        return type_id;    }

    public void setType_id(int type_id) {        this.type_id = type_id;    }}

OrderDao.java

package dao;

import bean.Order;

import java.util.List;

public interface OrderDao{

    void addOrder(Order order) throws Exception;

    Order findUF(Order order) throws Exception ;

    List<Order> findUserId(String userId) throws Exception;    Order findById(String id) throws Exception;    void removeOrder(int id) throws Exception;

}

O'r'de'r'DaoImpl.java

package dao.daoImpl;

import bean.Food;import bean.Order;import dao.FoodDao;import dao.OrderDao;import util.C3P0Util;

import java.math.BigDecimal;import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.util.ArrayList;import java.util.List;

public class OrderDaoImpl implements OrderDao {

    FoodDao  foodDao = new FoodDaoImpl();

    @Override    public void addOrder(Order order) throws Exception {        //查找是否该用户已经添加了这道菜        Order sc = this.findUF(order);

        if(sc == null){            //该用户还没有添加这道菜            String sql = "INSERT INTO `xiaojungan`.`t_order`(`food_id`,`user_id`,`table_id`,`food_account`) VALUES(?,?,?,?)";

            try(                    Connection conn = C3P0Util.getConnection();                    PreparedStatement ps = conn.prepareStatement(sql);            ) {                ps.setInt(1,order.getFood_id());                ps.setInt(2,order.getUser_id());                ps.setInt(3,order.getTable_id());                ps.setInt(4,order.getFood_account());

                ps.executeUpdate();            } catch (Exception e) {                e.printStackTrace();                throw new RuntimeException("添加失败！");            }        }else{ //已经添加这道菜，则更新数量            String sql = "UPDATE `xiaojungan`.`t_order` SET `food_account` = "+ sc.getFood_account()+"" +                    "+1 WHERE id="+sc.getId();            System.out.println(sql);            try(                    Connection conn = C3P0Util.getConnection();                    PreparedStatement ps = conn.prepareStatement(sql);            ) {                ps.executeUpdate();            } catch (Exception e) {                e.printStackTrace();                throw new RuntimeException("添加失败！");            }        }

    }

    @Override    public Order findUF(Order order) throws Exception {

        String sql = "select * from t_order where user_id=? and food_id=?";

        Order s = null;

        try(                Connection conn = C3P0Util.getConnection();                PreparedStatement ps = conn.prepareStatement(sql);        ) {            ps.setInt(1,order.getUser_id());            ps.setInt(2,order.getFood_id());            try(                    ResultSet rs = ps.executeQuery();            ){                if(rs.next()) {                    s = new Order();

                    s.setId(rs.getInt(1));                    s.setFood_id(rs.getInt(2));                    s.setUser_id(rs.getInt(3));                    s.setFood_account(rs.getInt(4));                    Food b = foodDao.findFood_id(order.getFood_id());                    BigDecimal sellingPrice = b.getPrice();                    String foodName = b.getFoodname();                    s.setPrice(sellingPrice);                    s.setFoodName(foodName);                    //计算总价                    s.setTotalPrice(sellingPrice.multiply(BigDecimal.valueOf(s.getFood_account())));

                    System.out.println("s:" + s);                }            }catch (Exception e){            }        } catch (Exception e) {            e.printStackTrace();        }

        return s;

    }

    @Override    public  List<Order> findUserId(String userId) throws Exception {        String sql = "select * from t_order where user_id=?";        List<Order> shopCartList = new ArrayList<>();        try(                Connection conn = C3P0Util.getConnection();                PreparedStatement ps = conn.prepareStatement(sql)        ) {            ps.setInt(1, Integer.parseInt(userId));            try (                    ResultSet rs = ps.executeQuery()            ) {

                //将查询出的结果数据封装到List对象中                while(rs.next()){                    Order s = new Order();

                    s.setId(rs.getInt(1));                    s.setFood_id(rs.getInt(2));                    s.setUser_id(rs.getInt(3));                    s.setTable_id(rs.getInt(4));                    s.setFood_account(rs.getInt(5));                    Food b = foodDao.findFood_id(s.getFood_id());                    BigDecimal sellingPrice = b.getPrice();                    String foodName = b.getFoodname();                    s.setPrice(sellingPrice);                    s.setFoodName(foodName);                    //计算总价                    s.setTotalPrice(sellingPrice.multiply(BigDecimal.valueOf(s.getFood_account())));

                    shopCartList.add(s);                }            } catch (Exception e) {                e.printStackTrace();            }        }catch (Exception e){            e.printStackTrace();        }        return shopCartList;    }    public Order findById(String id) throws Exception {        String sql = "select * from t_order where id=?";

        Order s = null;

        try(                Connection conn = C3P0Util.getConnection();                PreparedStatement ps = conn.prepareStatement(sql)        ) {            ps.setInt(1, Integer.valueOf(id));

            try (                    ResultSet rs = ps.executeQuery()            ) {                //将查询出的结果数据封装到Order对象中                if(rs.next()){                    s = new Order();                    s.setId(rs.getInt(1));                    s.setFood_id(rs.getInt(2));                    s.setUser_id(rs.getInt(3));                    s.setTable_id(rs.getInt(4));                    s.setFood_account(rs.getInt(5));                    Food b = foodDao.findFood_id(s.getFood_id());                    BigDecimal sellingPrice = b.getPrice();                    String foodName = b.getFoodname();                    s.setPrice(sellingPrice);                    s.setFoodName(foodName);                    //计算总价                    s.setTotalPrice(sellingPrice.multiply(BigDecimal.valueOf(s.getFood_account())));                    return s;                }            } catch (Exception e) {                e.printStackTrace();            }        }catch (Exception e){            e.printStackTrace();        }        return s;    }    @Override    public void removeOrder(int id) throws Exception {        String sql = "DELETE FROM `xiaojungan`.`t_order` WHERE id=?";

        try(                Connection conn = C3P0Util.getConnection();                PreparedStatement ps = conn.prepareStatement(sql);        ) {            ps.setInt(1, id);

            ps.executeUpdate();        } catch (Exception e) {            e.printStackTrace();            throw new RuntimeException("移除失败！");        }    }}

OrderService.java

package service;

import bean.Order;

import java.util.List;

public interface OrderService {    void addOrder(Order order) throws Exception ;

    List<Order> findByUserId(String usr_id) throws Exception;    Order findById(String id) throws Exception;

    void clear();

    void removeOrder(String[] orders);

}

OrderServiceImpl.java

package service.serviceImpl;

import bean.Order;import dao.OrderDao;import dao.daoImpl.OrderDaoImpl;import service.OrderService;

import java.math.BigDecimal;import java.util.List;

public class OrderServiceImpl implements OrderService {

    BigDecimal totalPrice;    private OrderDao orderDao = new OrderDaoImpl();

    @Override    public void addOrder(Order order) throws Exception {        orderDao.addOrder(order);    }

    @Override    public List<Order> findByUserId(String user_id) throws Exception {        List<Order> orderList = orderDao.findUserId(user_id);        return orderList;    }

    @Override    public void removeOrder(String[] orders) {        //遍历数据        for(int i=0;i<orders.length;i++) {            //移除            int shopId=Integer.valueOf(orders[i]);            try {                orderDao.removeOrder(shopId);            } catch (Exception e) {                e.printStackTrace();            }        }    }

    public Order findById(String id) throws Exception {        Order order = orderDao.findById(id);        return order;    }    @Override    public void clear() {

    }}

OrderServlet.java

package servlet;

import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import java.io.IOException;

    @WebServlet("/OrderServlet")    public class OrderServlet  extends HttpServlet {        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {            doGet(request, response);        }

        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

            HttpSession session = request.getSession();            Object user = session.getAttribute("user");

            if(user != null){                //用户登陆                response.sendRedirect("/order.html");

            }else if(user == null){                //未登录                response.getWriter().write("请先登录！！1秒后转到登陆界面");                response.setHeader("refresh", "1;url=" + request.getContextPath()                        + "/login.html");            }

        }

}

User.java

package bean;import java.util.Date;public class User  {private int id;private String username;private String password;private int table_id;private int role;public int getId() {return id;}public void setId(int id) {this.id = id;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public int getRole() {return role;}public void setRole(int role) {this.role = role;}public int getTable_id() {return table_id;}public void setTable_id(int table_id) {this.table_id = table_id;}public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}
}

UserDaoImpl.java

package dao.daoImpl;import  bean.User;import  dao.UserDao;
import util.C3P0Util;
import java.sql.ResultSet;
import java.sql.Connection;
import java.sql.PreparedStatement;public class UserDaoImpl implements UserDao {@Overridepublic User login(User user)throws Exception {String sql = "select * from t_user where username=? and password=?";User lo= null;try(Connection conn =  C3P0Util.getConnection();PreparedStatement ps = conn.prepareStatement(sql);) {ps.setString(1, user.getUsername());ps.setString(2, user.getPassword());try(ResultSet rs = ps.executeQuery();){if(rs.next()) {lo = new User();lo.setId(rs.getInt(1));lo.setTable_id(rs.getInt(2));lo.setUsername(rs.getString(3));lo.setPassword(rs.getString(4));lo.setRole(rs.getInt(5));System.out.println("lo:" + lo);}}} catch (Exception e) {e.printStackTrace();}return lo;}@Overridepublic void addUser(User user)  throws Exception {String sql = "INSERT INTO t_user(username,password)  VALUES(?,?)";try (Connection conn = C3P0Util.getConnection();PreparedStatement ps = conn.prepareStatement(sql)) {ps.setString(1, user.getUsername());ps.setString(2, user.getPassword());ps.executeUpdate();} catch (Exception e) {e.printStackTrace();throw new RuntimeException("注册失败！");}}@Overridepublic User findById(int id) throws Exception {String sql = "select * from t_user where id=?";User u = null;try(Connection conn = C3P0Util.getConnection();PreparedStatement ps = conn.prepareStatement(sql)) {ps.setInt(1, id);try (ResultSet rs = ps.executeQuery()) {//将查询出的结果数据封装到Book对象中if(rs.next()){u = new User();u.setId(rs.getInt(1));u.setTable_id(rs.getInt(2));u.setUsername(rs.getString(3));u.setPassword(rs.getString(4));u.setRole(rs.getInt(5));return u;}} catch (Exception e) {e.printStackTrace();}}catch (Exception e){e.printStackTrace();}return u;}}

转载于:https://www.cnblogs.com/luv-letter/p/10944996.html

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