程序功能：控制台输入车辆信息，将信息保存至数据库中
程序代码如下：
BaseDao.java
package DAO_dome.kehozuoye;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class BaseDao {
private String driver = "com.mysql.jdbc.Driver";//数据库驱动字符串
private String url = "jdbc:mysql://localhost:3306/zoology?useUnicode=true&characterEncoding=utf8";
private String user = "root";//数据库用户名
private String password = "duanqibo919";//数据库密码
//打开数据库方法
Connection con = null;
public Connection getConnection() {
//加载驱动
try {
Class.forName(driver);
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//连接数据库
try {
con = DriverManager.getConnection(url,user,password);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return con;
}
//关闭资源方法
public void CloseAll(Connection con,PreparedStatement pre,ResultSet result) {
if(result!=null) {
try {
result.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(pre!=null) {
try {
pre.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(con!=null) {
try {
con.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
//增删改查通用方法
public int executeUpdate(String sql,Object[] param) {
int num = 0;//影响行数
con = this.getConnection();
PreparedStatement pre = null;
try {
pre = con.prepareStatement(sql);
//为参数赋值
if(param!=null) {
for(int i=0;i<param.length;i++) {
pre.setObject(i+1, param[i]);
}
}
//执行sql语句
num = pre.executeUpdate();
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}finally {
this.CloseAll(con, pre, null);
}
return num;
}
}
Test.java
package DAO_dome.kehozuoye;
import java.util.Scanner;
import DAO_dome.kehozuoye.VehicleDao;
import DAO_dome.kehozuoye.VehicleDaoMysql;
public class Test {
public static void main(String[] args) {
VehicleDao vehicleDao = new VehicleDaoMysql();
Vehicle vehicle = new Vehicle();
String identity = "";//车主身份证号码
String heading = "";//车辆识别码
double emissions = 0;//车辆排量
double price = 0.0;//官方指导价
double invoice = 0.0;//发票价格
double purchase = 0.0;//缴纳车辆购税价
double purchasePrice = 0.0;//计税价格
Scanner scanner = new Scanner(System.in);
System.out.println("记录车辆购置税，请按提示录入相关信息：");
System.out.println("请输入车主身份证号码(18位)：");
identity = scanner.next();
while(identity.length()!=18) {
System.out.println("输入错误！请重新输入：");
identity = scanner.next();
}
System.out.println("请输入车辆识别码(17位)：");
heading = scanner.next();
while(heading.length()!=17) {
System.out.println("输入错误！请重新输入：");
heading = scanner.next();
}
System.out.println("请输入车辆排量：");
emissions = scanner.nextDouble();
System.out.println("请输入官方指导价：");
price = scanner.nextDouble();
System.out.println("请输入发票价格：");
invoice = scanner.nextDouble();
purchasePrice = invoice/(1+0.17);
if(emissions>1.6) {
purchase = purchasePrice*0.1;
}else {
purchase = purchasePrice*0.075;
}
vehicle.setIdentity(identity);
vehicle.setHeading(heading);
vehicle.setEmissions(emissions);
vehicle.setPrice(price);
vehicle.setInvoice(invoice);
vehicle.setPurchase(purchase);
vehicleDao.save(vehicle);
System.out.println("数据保存成功，车辆购置税为"+purchase);
scanner.close();
}
}
Vehicle.java
package DAO_dome.kehozuoye;
public class Vehicle {
/*
* 汽车实体类
*/
private String identity;//车主身份证号码
private String heading;//车辆识别码
private double emissions;//车辆排量
private double price;//官方指导价
private double invoice;//发票价格
private double purchase;//缴纳车辆购税价
public String getIdentity() {
return identity;
}
public void setIdentity(String identity) {
this.identity = identity;
}
public String getHeading() {
return heading;
}
public void setHeading(String heading) {
this.heading = heading;
}
public double getEmissions() {
return emissions;
}
public void setEmissions(double emissions) {
this.emissions = emissions;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
public double getInvoice() {
return invoice;
}
public void setInvoice(double invoice) {
this.invoice = invoice;
}
public double getPurchase() {
return purchase;
}
public void setPurchase(double purchase) {
this.purchase = purchase;
}
}
VehicleDao.java //声明各种接口
package DAO_dome.kehozuoye;
import java.util.List;
import DAO_dome.kehozuoye.Vehicle;
public interface VehicleDao {
/*
* 汽车接口
*/
/**
* 保存汽车
* @param vehicie
* @return
*/
int save(Vehicle vehicle);
/**
* 删除信息
* @param vehicie
* @return
*/
int del(Vehicle vehicle);
/**
* 更新汽车
* @param vehicie
* @return
*/
int Update(Vehicle vehicle);
/**
* 获取汽车识别代码列表，模糊查找
* @param heading
* @return
*/
Vehicle getByName(String heading);
/**
* 获取汽车识别代码列表，精确查找
* @param heading
* @return
*/
List<Vehicle> findByName(String heading);
}
VehicleDaoMysql.java //上述接口的实现
package DAO_dome.kehozuoye;
import java.util.List;
import DAO_dome.kehozuoye.BaseDao;
import DAO_dome.kehozuoye.VehicleDao;
import DAO_dome.kehozuoye.Vehicle;
public class VehicleDaoMysql extends BaseDao implements VehicleDao{
@Override
public int save(Vehicle vehicle) {
// TODO Auto-generated method stub
String sql = "insert into vehicle(identity,heading,emissions,price,invoice,purchase) "
+ "values(?,?,?,?,?,?)";
Object[] param = {vehicle.getIdentity(),vehicle.getHeading(),vehicle.getEmissions(),
vehicle.getPrice(),vehicle.getInvoice(),vehicle.getPurchase()};
int result = this.executeUpdate(sql, param);
return result;
}
@Override
public int del(Vehicle vehicle) {
// TODO Auto-generated method stub
return 0;
}
@Override
public int Update(Vehicle vehicle) {
// TODO Auto-generated method stub
return 0;
}
@Override
public Vehicle getByName(String heading) {
// TODO Auto-generated method stub
return null;
}
@Override
public List<Vehicle> findByName(String heading) {
// TODO Auto-generated method stub
System.out.println();
return null;
}
}
