使用工具

IDEA2018.2 MySQL5.6 JDK1.8

mysql-connector-java-5.0.8-bin.jar

源码下载地址

码云链接：https://gitee.com/vvcat/fruit_store
mysql-connector-java-5.0.8-bin.jar 微云下载链接：https://share.weiyun.com/5jp0fIr

环境搭建

添加mysql-connector-java-5.0.8-bin.jar

将 mysql-connector-java-5.0.8-bin.jar 文件添加到resources目录下

此时并没有将 mysql-connector-java-5.0.8-bin.jar 加载到我们的程序中，需要进行以下操作

选择OK

此时这个jar包导入了我们的项目中，可以查看jar包中的代码

以下是代码结构和jar包存放的位置

IDEA连接数据库

IDEA分为
商业版本：Ultimate Edition；
免费版本：Community Edition；

如果出现Failed 说明数据库测试链接失败，请检查Database，User，Password等信息是否输入正确

出现Successful 说明数据库测试连接成功，我们可以使用和调用数据库的数据了。

代码示例

CREATE DATABASE fruit_store;USE fruit_store;CREATE TABLE fruits(id INT(11) NOT NULL AUTO_INCREMENT,name VARCHAR(50) NULL,price DOUBLE NULL,unit VARCHAR(50) NULL,expiredDate DATE NULL,PRIMARY KEY (id)
) ENGINE=INNODB AUTO_INCREMENT=1 CHARSET=utf8;INSERT INTO fruits (id, name, price, unit, expiredDate)
VALUES(1, '香蕉', '10.5', '斤', '2019-9-15'),(2, '苹果', '1.5', '斤', '2019-9-16');

Main.java

package com.gitee.vvcat;import java.text.ParseException;
import java.util.Scanner;
import com.gitee.vvcat.ui.AdminController;public class Main {public static void main(String[] args) throws ParseException {AdminController adminController = new AdminController();while (true) {int choice = adminController.menu();switch (choice) {case 1:adminController.queryAll();break;case 2:adminController.addFruit();break;case 3:adminController.updateFruit();break;case 4:adminController.deleteFruit();break;case 5:System.out.println("欢迎下次使用！");return;default:System.out.println("输入错误，请重新输入！");}}}}

AdminController.java

package com.gitee.vvcat.ui;/*** @Author ꧁ʚVVcatɞ꧂* @Date 2019/9/11 11:59* @Version 1.0**/import com.gitee.vvcat.model.Fruit;
import com.gitee.vvcat.services.AdminService;import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Scanner;public class AdminController {AdminService adminService= new AdminService();public   int menu() {Scanner scanner = new Scanner(System.in);System.out.println("\n\t\t商品管理系统");System.out.println("\t\t\t1:查询商品清单");System.out.println("\t\t\t2:添加新信息");System.out.println("\t\t\t3:更新信息");System.out.println("\t\t\t4:删除信息");System.out.println("\t\t\t5:退出系统");System.out.print("\t\t请选择你的操作（1-5）：");return scanner.nextInt();}public void queryAll() {ArrayList<Fruit> fruits = adminService.queryFruits();System.out.println("商品的所有清单");System.out.println("编号| 名称| 价格 | 单位 | 过期日期");for(Fruit item:fruits){System.out.println(item);}}public void addFruit() throws ParseException {SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");Scanner scanner = new Scanner(System.in);System.out.println("添加信息：");System.out.print("请输入编号：");int id = scanner.nextInt();System.out.print("请输入名称：");String name = scanner.next();System.out.print("请输入价格：");double price = scanner.nextDouble();System.out.print("请输入单位：");String unit = scanner.next();System.out.print("请输入过期日期：");Date expiredDate=sdf.parse(scanner.next());if (adminService.addFruit(id,name,price, unit,expiredDate)){System.out.println("\t信息添加成功！");}else {System.out.println("\t信息添加失败！");}}public void updateFruit() throws ParseException {SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");Scanner scanner = new Scanner(System.in);System.out.println("更新某个信息：");System.out.print("请输入要更改的编号：");int id = scanner.nextInt();System.out.print("请输入新的名称：");String name = scanner.next();System.out.print("请输入新的价格：");double price = scanner.nextDouble();System.out.print("请输入新的单位：");String unit = scanner.next();System.out.print("请输入新的过期日期：");Date expiredDate=sdf.parse(scanner.next());if (adminService.updateFruit(id,name,price, unit,expiredDate)){System.out.println("\t信息更新成功！");}else {System.out.println("\t信息更新失败！");}}public void deleteFruit() {Scanner scanner = new Scanner(System.in);System.out.println("删除某个信息：");System.out.print("请输入要删除的编号：");int id= scanner.nextInt();if(adminService.deleteFruit(id)){System.out.println("删除成功！");}else {System.out.println("删除失败！");}}
}

AdminService.java

package com.gitee.vvcat.services;/*** @Author ꧁ʚVVcatɞ꧂* @Date 2019/9/11 11:58* @Version 1.0**/import com.gitee.vvcat.model.*;
import com.gitee.vvcat.data.FruitRepository;import java.util.ArrayList;
import java.util.Date;public class AdminService {private Repository<Fruit> repository=new FruitRepository();public ArrayList<Fruit> queryFruits(){return repository.all();}public boolean addFruit(int id,String name ,double price,String unit,Date expiredDate){Fruit item = repository.getById(id);if (item==null){Fruit fruit = new Fruit(id, name, price, unit, expiredDate);repository.insert(fruit);return true;}return false;}public boolean updateFruit(int id,String name ,double price,String unit,Date expiredDate){Fruit item = repository.getById(id);if (item!=null){item.setName(name);item.setPrice(price);item.setUnit(unit);item.setExpiredDate(expiredDate);repository.update(item);return true;}return false;}public boolean deleteFruit(int id){Fruit item = repository.getById(id);if (item!=null){repository.delete(id);return true;}return false;}
}

Repository.java

package com.gitee.vvcat.model;/*** @Author ꧁ʚVVcatɞ꧂* @Date 2019/9/11 11:57* @Version 1.0**/
import java.util.ArrayList;public interface Repository<T> {ArrayList<T> all();T getById(int id);void insert(T entity);void update(T entity);void delete(int id);}

Fruit.java

package com.gitee.vvcat.model;/*** @Author ꧁ʚVVcatɞ꧂* @Date 2019/9/11 11:57* @Version 1.0**/
import java.text.SimpleDateFormat;
import java.util.Date;public class Fruit {private int id;private String name;private double price;private String unit;private Date expiredDate;public Fruit() {}public Fruit(int id, String name, double price, String unit, Date expiration) {this.id = id;this.name = name;this.price = price;this.unit = unit;this.expiredDate = expiration;}public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public double getPrice() {return price;}public void setPrice(double price) {this.price = price;}public String getUnit() {return unit;}public void setUnit(String unit) {this.unit = unit;}public Date getExpiredDate() {return expiredDate;}public void setExpiredDate(Date expiredDate) {this.expiredDate = expiredDate;}@Overridepublic String toString() {SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");return "\t"+getId()+"\t"+getName()+"\t"+getPrice()+"\t"+getUnit()+"\t"+simpleDateFormat.format(getExpiredDate());}public boolean isExpired(){if (new Date().before(expiredDate)){return false;}return true;}
}

FruitRepository.java

package com.gitee.vvcat.data;/*** @Author ꧁ʚVVcatɞ꧂* @Date 2019/9/11 11:58* @Version 1.0**/import com.gitee.vvcat.model.Fruit;
import com.gitee.vvcat.model.Repository;
import com.gitee.vvcat.util.DbUtility;import java.sql.*;
import java.util.ArrayList;
import java.util.Date;public class FruitRepository implements Repository<Fruit> {@Overridepublic ArrayList<Fruit> all() {Connection conn=null;Statement smt=null;ResultSet rs=null;String sql = "select * from fruits";ArrayList<Fruit> result = new ArrayList<Fruit>();try {conn = DbUtility.getConnection();smt=conn.createStatement();rs=smt.executeQuery(sql);while(rs.next()){Fruit fruit = new Fruit();fruit.setId(rs.getInt("id"));fruit.setName(rs.getString("name"));fruit.setPrice(rs.getDouble("price"));fruit.setUnit(rs.getString("unit"));fruit.setExpiredDate(new Date(rs.getDate("expireddate").getTime()));result.add(fruit);}} catch (ClassNotFoundException e) {e.printStackTrace();} catch (SQLException e) {e.printStackTrace();}finally {DbUtility.release(smt,conn,rs);}return result;}@Overridepublic Fruit getById(int id) {Connection conn=null;PreparedStatement smt=null;ResultSet rs=null;String sql = "select * from fruits where id=?";try {conn = DbUtility.getConnection();smt=conn.prepareStatement(sql);smt.setInt(1,id);rs=smt.executeQuery();if (rs.next()){Fruit fruit = new Fruit();fruit.setId(rs.getInt("id"));fruit.setName(rs.getString("name"));fruit.setPrice(rs.getDouble("price"));fruit.setUnit(rs.getString("unit"));fruit.setExpiredDate(new Date(rs.getDate("expireddate").getTime()));return fruit;}return null;} catch (ClassNotFoundException e) {e.printStackTrace();} catch (SQLException e) {e.printStackTrace();}finally {DbUtility.release(smt,conn,rs);}return null;}@Overridepublic void insert(Fruit entity) {Connection conn=null;PreparedStatement smt=null;String sql = "insert into fruits(id,name,price,unit,expireddate) values(?,?,?,?,?)";try {conn=DbUtility.getConnection();smt=conn.prepareStatement(sql);smt.setInt(1,entity.getId());smt.setString(2,entity.getName());smt.setDouble(3,entity.getPrice());smt.setString(4,entity.getUnit());smt.setDate(5,new java.sql.Date(entity.getExpiredDate().getTime()));smt.executeUpdate();} catch (SQLException e) {e.printStackTrace();} catch (ClassNotFoundException e) {e.printStackTrace();}finally {DbUtility.release(smt,conn);}}@Overridepublic void update(Fruit entity) {Connection conn=null;PreparedStatement smt=null;String sql = "UPDATE fruits SET name=? , price=? ,unit=?,expireddate=? WHERE id=?";try {conn=DbUtility.getConnection();smt=conn.prepareStatement(sql);smt.setString(1,entity.getName());smt.setDouble(2,entity.getPrice());smt.setString(3,entity.getUnit());smt.setDate(4,new java.sql.Date(entity.getExpiredDate().getTime()));smt.setInt(5,entity.getId());smt.executeUpdate();} catch (SQLException e) {e.printStackTrace();} catch (ClassNotFoundException e) {e.printStackTrace();}finally {DbUtility.release(smt,conn);}}@Overridepublic void delete(int id) {Connection conn=null;PreparedStatement smt=null;String sql = "DELETE FROM fruits WHERE id=?";try {conn=DbUtility.getConnection();smt=conn.prepareStatement(sql);smt.setInt(1,id);smt.executeUpdate();} catch (SQLException e) {e.printStackTrace();} catch (ClassNotFoundException e) {e.printStackTrace();}finally {DbUtility.release(smt,conn);}}
}

DbUtility.java

package com.gitee.vvcat.util;/*** @Author ꧁ʚVVcatɞ꧂* @Date 2019/9/11 11:59* @Version 1.0**/import java.sql.*;public class DbUtility {public static Connection getConnection() throws ClassNotFoundException, SQLException {Class.forName("com.mysql.jdbc.Driver");String url = "jdbc:mysql://localhost:3306/fruit_store";String user = "root";String password = "123456";Connection conn = DriverManager.getConnection(url, user, password);return conn;}public static void release(Statement smt,Connection conn){release(smt);release(conn);}private static<T extends AutoCloseable> void release(T smt) {if (smt!=null){try {smt.close();} catch (SQLException e) {e.printStackTrace();} catch (Exception e) {e.printStackTrace();}smt=null;}}public static void release(Statement smt,Connection conn,ResultSet rs){release(smt);release(conn);release(rs);}}

效果展示

运行
界面
查询商店清单
添加商品信息
更新商品信息
删除商品信息
退出系统

如有疑问，请在下方留言

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