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Java从零编写汽车租赁系统全程分析

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覆盖知识

程序基本概念、数据类型、流程控制、顺序、选择 、循环、跳转语句、变量、类、方法、继承、多态。

掌握数据库、JDBC、三层架构等相关知识。

掌握Druid连接池、Apache的DBUtils使用 。

项目需求

某汽车租赁公司出租多种轿车和客车,出租费用以日为单位计算。

出租车型及信息如下表所示:

车型具体信息日租金折扣
轿车宝马X6(京NY28588)800days>7天9折 days>30天8折 days>150天7折
宝马550i(京CNY3284)600
别克林荫大道(京NT37465)300
别克GL8(京NT96968)600
客车金杯,16座(京6566754)800days>=3天9折 days>=7天8折 days>=30天7折 days>=150天6折
金龙,16座(京8696997)
金杯,34座(京9696996)1500
金龙,34座(京8696998)

设计步骤

开发思路

(1)明确需求

(2)编码顺序

1)、添加需要的jar包到项目中,将lib文件夹中的jar文件通过鼠标右单击选择Build Path的方式添加到你设置的eatJar文件目录里。

2)、创建database.properties文件,用来配置注册驱动和数据库连接对象的相关数据。

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/java221804
username=root
password=huanghuang
initialSize=10
maxActive=30
maxIdle=5
maxWait=3000

3)、添加需要的工具类DBUtils类

package cn.eat.utils;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
import javax.sql.DataSource;
import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.pool.DruidDataSourceFactory;
public class DBUtils {
	private static DruidDataSource druidDataSource;
	static {
		Properties properties = new Properties();
		try {
			InputStream is = DBUtils.class
					.getResourceAsStream("/database.properties");
			properties.load(is);
			druidDataSource = (DruidDataSource) DruidDataSourceFactory
					.createDataSource(properties);
		} catch (IOException e) {
			e.printStackTrace();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	public static DataSource getDataSource(){
		return druidDataSource;
	}
}

4)、创建数据表:automobile表

CREATE TABLE `automobile` (
  `numberPlate` varchar(20) DEFAULT NULL,
  `brand` varchar(10) DEFAULT NULL,
  `dayRent` double DEFAULT NULL,
  `type` varchar(10) DEFAULT NULL,
  `seat` int(11) DEFAULT NULL
) 

automobile表效果展示

5)、完成父类(汽车类)的编写

6)、再完成子类(客车类和轿车类)的编写

7)、数据访问层DAO层的接口和实现类的增删改查方法的编写

8)、服务层Service层的接口和实现类的增删改查方法的编写

9)、最后完成视图层View层测试类的编写

类的属性和方法

属性:

方法:

定义租车的方法,不同类型的汽车采用不同租金方法进行计算。

代码展示

1、汽车类(父类)

package cn.automobile.entity;
public abstract class Automobile {
	// 定义汽车类的属性(车牌号、品牌、日租金)
	private String numberPlate;
	private String brand;
	private double dayRent;
	public Automobile() {
		super();
	}
	public Automobile(String numberPlate, String brand, double dayRent) {
		super();
		this.numberPlate = numberPlate;
		this.brand = brand;
		this.dayRent = dayRent;
	}
	public String getNumberPlate() {
		return numberPlate;
	}
	public void setNumberPlate(String numberPlate) {
		this.numberPlate = numberPlate;
	}
	public String getBrand() {
		return brand;
	}
	public void setBrand(String brand) {
		this.brand = brand;
	}
	public double getDayRent() {
		return dayRent;
	}
	public void setDayRent(double dayRent) {
		this.dayRent = dayRent;
	}
	//定义计算租金的抽象方法
	public abstract double calRent(int days,double dayRent);
	@Override
	public String toString() {
		return "Automobile [numberPlate=" + numberPlate + ", brand=" + brand
				+ ", dayRent=" + dayRent + "]";
	}
}

2、轿车类(子类)

package cn.automobile.entity;
public class Bus extends Automobile {
	private int seat;
	public Bus() {
		super();
	}
	public Bus(String numberPlate, String brand, double dayRent, int seat) {
		super(numberPlate, brand, dayRent);
		this.seat = seat;
	}
	public int getSeat() {
		return seat;
	}
	public void setSeat(int seat) {
		this.seat = seat;
	}
	@Override
	public double calRent(int days,double dayRent) {
//		System.out.println("bus");
		double discount=dayRent*days;
		if(days>150){
			discount*=0.6;
		}else if(days>30){
			discount*=0.7;
		}else if(days>7){
			discount*=0.8;
		}else if(days>3){
			discount*=0.9;
		}
		return discount;
	}
}

3、客车类(子类)

package cn.automobile.entity;
public class Car extends Automobile {
	// 定义特有属性
	private String type;
	public Car() {
		super();
	}
	public Car(String numberPlate, String brand, double dayRent, String type) {
		super(numberPlate, brand, dayRent);
		this.type = type;
	}
	public String getType() {
		return type;
	}
	public void setType(String type) {
		this.type = type;
	}
	@Override
	public double calRent(int days,double dayRent) {
//		System.out.println("car");
		double discount=dayRent*days;
		if(days>150){
			discount*=0.7;
		}else if(days>30){
			discount*=0.8;
		}else if(days>7){
			discount*=0.9;
		}
		return discount;
	}
}

4、数据访问层AutomobileDao接口

package cn.automobile.dao;
import cn.automobile.entity.Automobile;
import cn.automobile.entity.Bus;
import cn.automobile.entity.Car;
public interface AutomobileDao {
	//查bus
	Automobile selectOne(Bus bus);
	//查car
	Automobile selectOne(Car car);
}

5、数据访问层AutomobileDaoImpl实现类

package cn.automobile.dao.Impl;
import java.sql.SQLException;
import java.util.List;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import cn.automobile.dao.AutomobileDao;
import cn.automobile.entity.Automobile;
import cn.automobile.entity.Bus;
import cn.automobile.entity.Car;
import cn.automobile.utils.DBUtils;
public class AutomobileDaoImpl implements AutomobileDao {
	private QueryRunner queryRunner = new QueryRunner(DBUtils.getDataSource());
	@Override
	public Automobile selectOne(Bus bus) {
		String sql="select * from automobile;";
		try {
			 List<Bus> listAutomobiles=queryRunner.query(sql, new BeanListHandler<Bus>(Bus.class));
			 for (Bus bus1 : listAutomobiles) {
				if(bus1.getBrand().equals(bus.getBrand())&&bus1.getSeat()==bus.getSeat()){
					return bus1;
				}
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return null;
	}
	@Override
	public Automobile selectOne(Car car) {
		String sql="select * from automobile;";
		try {
			 List<Car> listAutomobiles=queryRunner.query(sql, new BeanListHandler<Car>(Car.class));
			 for (Car car1 : listAutomobiles) {
				if(car1.getBrand().equals(car.getBrand())&&car1.getType().equals(car.getType())){
					return car1;
				}
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return null;
	}
}

6、服务层 AutomobileService 接口

package cn.automobile.service;
import cn.automobile.entity.Automobile;
import cn.automobile.entity.Bus;
import cn.automobile.entity.Car;
public interface AutomobileService {
	//查bus
	Automobile selectBus(Bus bus);
	//查car
	Automobile selectCar(Car car);
}

7、服务层AutomobileServiceImpl 实现类

package cn.automobile.service.impl;
import cn.automobile.dao.AutomobileDao;
import cn.automobile.dao.Impl.AutomobileDaoImpl;
import cn.automobile.entity.Automobile;
import cn.automobile.entity.Bus;
import cn.automobile.entity.Car;
import cn.automobile.service.AutomobileService;
public class AutomobileServiceImpl implements AutomobileService {
	AutomobileDao autoD=new AutomobileDaoImpl();
	@Override
	public Automobile selectBus(Bus bus) {
		return autoD.selectOne(bus);
	}
	@Override
	public Automobile selectCar(Car car) {
		return autoD.selectOne(car);
	}
}

8、视图层:租车测试AutomobileMgr类

package cn.automobile.view;
import java.util.Scanner;
import cn.automobile.entity.Automobile;
import cn.automobile.entity.Bus;
import cn.automobile.entity.Car;
import cn.automobile.service.AutomobileService;
import cn.automobile.service.impl.AutomobileServiceImpl;
public class AutomobileMgr {
	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		String brand=null,type=null;
		int seat=0;
		double money = 0;
		Automobile automobile=null;
		AutomobileService autoS=new AutomobileServiceImpl();
		System.out.println("********欢迎光临租赁公司********\n");
		System.out.println("请选择汽车类型:1、轿车\t2、客车");
		int autoType=sc.nextInt();
		if(autoType==1){
			System.out.println("请选择轿车品牌:1、宝马\t2、别克");
			brand=(sc.nextInt()==1)?"宝马":"别克";
			if(brand=="宝马"){
				System.out.println("请选择轿车型号:1、X6\t2、550i");
				type=(sc.nextInt()==1)?"X6":"550i";
			}else if(brand=="别克"){
				System.out.println("请选择轿车型号:1、林荫大道\t2、GL8");
				type=(sc.nextInt()==1)?"林荫大道":"GL8";
			}
		}else if(autoType==2){
			System.out.println("请选择客车品牌:1、金杯\t2、金龙");
			brand=(sc.nextInt()==1)?"金杯":"金龙";
			System.out.println("请选择需要的座位数:1、16座\t2、34座");
			seat=(sc.nextInt()==1)?16:34;
		}
		System.out.println("请选择租赁天数:");
		int days=sc.nextInt();
		if (seat==0) {
			Car car=new Car();
			car.setBrand(brand);
			car.setType(type);
			automobile=autoS.selectCar(car);	
			money=car.calRent(days,automobile.getDayRent());		
		}else if(seat!=0) {
			Bus bus=new Bus();
			bus.setBrand(brand);
			bus.setSeat(seat);
			automobile=autoS.selectBus(bus);
			money=bus.calRent(days,automobile.getDayRent());		
		}
//		System.out.println(automobile);
		System.out.println("租车成功!请按照"+automobile.getNumberPlate()+"车牌号取车!租金为:"+money+"元");
	}
}

效果展示

​​

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