第7章课后作业

第3题

package daoClass;

import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.Properties;
//工具类
public class Dao {
   private static String driver = null;
   private static String url = null;
   private static String userName = null;
   private static String password = null;
   private static final String resource = "database.properties";
   protected Connection conn = null;
   protected PreparedStatement pst = null;
   ResultSet rs = null;
   public void setRs(ResultSet rs) {
       this.rs = rs;
   }

   static {
       InputStream in = Dao.class.getClassLoader().getResourceAsStream(resource);
       Properties properties = new Properties();
       try {
           properties.load(in);
           driver = properties.getProperty("driver");
           url = properties.getProperty("url");
           userName = properties.getProperty("userName");
           password = properties.getProperty("password");
       } catch (IOException e) {
           e.printStackTrace();
       }

   }
//连接数据库
   public static Connection getConnection() throws Exception {
       Class.forName(driver);
       Connection connection = DriverManager.getConnection(url, userName, password);
       return connection;
   }
//释放资源
   public static void release(Connection conn, PreparedStatement pst, ResultSet rs) throws Exception {
       if (conn != null) {
           conn.close();
       }
       if (pst != null) {
           pst.close();
       }
       if (rs != null) {
           rs.close();
       }
   }
   //更新数据
   public int executeUpdate(String sql,Object...params) throws Exception{
       Connection conn = getConnection();
       pst = conn.prepareStatement(sql);
       for (int i = 0; i < params.length; i++) {
           pst.setObject(i+1, params[i]);
       }
       int row = 0;
       try {
           row = pst.executeUpdate();
       } catch (Exception e) {
           e.printStackTrace();
       } finally {
           release(conn, pst, rs);
       }
       return row;
   }
}

package entityClass;
//实体类
public class CarMess {
   private String IdentityCard;
   private String carNumberId;
   private double carDisplacement;
   private double guidePrice;
   private double invoicePrice;
   private double purchaseTax;

   public CarMess() {
       super();
       // TODO Auto-generated constructor stub
   }
   public CarMess(String identityCard, String carNumberId, Double carDisplacement, Double guidePrice,
           Double invoicePrice,Double purchaseTax) {
       super();
       IdentityCard = identityCard;
       this.carNumberId = carNumberId;
       this.carDisplacement = carDisplacement;
       this.guidePrice = guidePrice;
       this.invoicePrice = invoicePrice;
       this.purchaseTax = purchaseTax;
   }
   public Double getPurchaseTax() {
       return purchaseTax;
   }
   public void setPurchaseTax(Double purchaseTax) {
       this.purchaseTax = purchaseTax;
   }
   public String getIdentityCard() {
       return IdentityCard;
   }
   public void setIdentityCard(String identityCard) {
       IdentityCard = identityCard;
   }
   public String getCarNumberId() {
       return carNumberId;
   }
   public void setCarNumberId(String carNumberId) {
       this.carNumberId = carNumberId;
   }
   public Double getCarDisplacement() {
       return carDisplacement;
   }
   public void setCarDisplacement(Double carDisplacement) {
       this.carDisplacement = carDisplacement;
   }
   public Double getGuidePrice() {
       return guidePrice;
   }
   public void setGuidePrice(Double guidePrice) {
       this.guidePrice = guidePrice;
   }
   public Double getInvoicePrice() {
       return invoicePrice;
   }
   public void setInvoicePrice(Double invoicePrice) {
       this.invoicePrice = invoicePrice;
   }

}

package implementsClass;

import daoClass.Dao;
import interfaceClass.CarDao;
//实现类
public class CarDaoImp extends Dao implements CarDao {

   //增加数据
   public int add(String IdentityCard, String carNumberId, double carDisplacement, double guidePrice,
           double invoicePrice, double purchaseTax) throws Exception {
       String sql = "INSERT INTO purchaseTax VALUES(?,?,?,?,?,?)";
       int row = executeUpdate(sql, IdentityCard,carNumberId,carDisplacement,guidePrice,invoicePrice,purchaseTax);
       return row;
   }

}

package implementsClass;

import interfaceClass.CarDao;
import interfaceClass.CarService;

public class CarServiceImp implements CarService {
   private CarDao cd;


   public CarServiceImp() {
       super();
       this.cd = new CarDaoImp();
   }

   @Override
   public int add(String IdentityCard, String carNumberId,double carDisplacement, double guidePrice,
           double invoicePrice, double purchaseTax) throws Exception {
       int row = cd.add(IdentityCard, carNumberId,carDisplacement, guidePrice, invoicePrice, purchaseTax);
       return row;
   }

}

package interfaceClass;

public interface CarDao {
   public int add(String IdentityCard,
           String carNumberId,double carDisplacement,
           double guidePrice,double invoicePrice,double purchaseTax)throws Exception;
}

package interfaceClass;

public interface CarService {
   public int add(String IdentityCard,
           String carNumberId,double carDisplacement,
           double guidePrice,double invoicePrice,double purchaseTax)throws Exception;
}

package TestClass;
import java.util.Scanner;

import implementsClass.CarServiceImp;
import interfaceClass.CarService;
//测试类
public class BuyCar {
   public static void main(String[] args) {
       Scanner in =new Scanner(System.in);
       CarService cs = new CarServiceImp();
       System.out.println("记录车辆购置税,请按提示录入相关信息:");
       System.out.print("请输入车主身份证号码(18位):");
       String IdentityCard = in.next();
       System.out.print("请输入车辆识别码(17位):");
       String carNumberId = in.next();
       System.out.print("请输入车辆排量:");
       double carDisplacement = in.nextDouble();
       System.out.print("请输入官方指导价:");
       double guidePrice = in.nextDouble();
       System.out.print("请输入发票价格:");
       double invoicePrice = in.nextDouble();
       double purchaseTax =0;
       if(carDisplacement<=1.6) {
           purchaseTax = invoicePrice/1.17*0.075;
       }else {
           purchaseTax = invoicePrice/1.17*0.1;
       }
       purchaseTax = (int)(purchaseTax*100)/100.00;
       try {
           int row = cs.add(IdentityCard, carNumberId, carDisplacement, guidePrice, invoicePrice, purchaseTax);
           if (row > 0) {
               System.out.println("数据保存成功,车辆购置税为:" + purchaseTax);
           }
       } catch (Exception e) {
           e.printStackTrace();
       } finally {
           in.close();
       }
   }
}

//配置文件

省略..........

第7章 课后作业

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