使用DAO模式开发宠物管理系统---hellokitty

宠物有狗和企鹅。

狗的属性有：编号、名称、亲密值、健康值、品种、所属主人编号。

企鹅的属性有：编号、名称、亲密值、健康值、性别、所属主人编号。

该系统中主人可以领养宠物，主人的属性有：编号、用户名、密码、姓名、地址、电话。

要求将狗和企鹅的数据保存到同一张表中除所属主人编号、品种、性别外，其余列均不允许为空。主人编号为空表示该宠物未被人领养。

创建宠物表与主人表，狗和企鹅、主人各初始化5条以上的记录用于测试。

编写程序实现以下功能：

1. 主人可以登录到系统中完成下列操作：

2. 主人可以查看当前系统中未被领养的宠物

3. 主人可以领养宠物

4. 主人可以查看自己已领养的所有宠物的信息

5. 主人可以根据编号查询宠物信息

6. 主人可以弃养自己已领养的宠物

7. 退出系统

我是java的初学者，中间代码也有可能有错误的，或是不够简洁的。。。

辅助类

 package test;

 /**
  * DAO模式
  * 第一步 辅助类
  *
  * @author acer
  *
  */
 import java.io.File;
 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.util.Iterator;
 import java.util.List;

 import org.dom4j.Document;
 import org.dom4j.Element;
 import org.dom4j.io.SAXReader;

 /**
  *
  * JDBC编程步骤：
  * 1  加载驱动  Class.forName("字符串")
  * 2 建立Connection对象
  * 3 通过Connetion创建PreparedStatement对象
  * 4 执行SQL语句
  * 5 处理结果
  * 6 释放资源
  * @author acer
  *
  */
 public class JdbcUtil {

     private static String driver;// 驱动
     private static String url;// 连接字符串
     private static String user;// 用户名
     private static String password;// 密码

     private static Connection conn;// Connection对象
     private static PreparedStatement ptmt;// PreparedStatement对象
     private static ResultSet rs;// ResultSet对象

     /* 加载数据库驱动 */
     static {
         try {
             loadDatabase();
         } catch (Exception e1) {
             e1.printStackTrace();
         }
         try {
             Class.forName(driver);
         } catch (ClassNotFoundException e) {
             throw new RuntimeException(e);
         }
     }

     private JdbcUtil() {

     }

     /**
      * 读取配置文件
      *
      * @throws Exception
      */

     private static void loadDatabase() throws Exception {
         // 创建SAXReader对象
         SAXReader reader = new SAXReader();
         // 创建Document对象
         Document document = reader.read(new File("src/test/database.xml"));
         List list = document.selectNodes("/database/driver");
         // 迭代
         Iterator it = list.iterator();
         while (it.hasNext()) {
             Element item = (Element) it.next();
             driver = item.getText();
         }

         list = document.selectNodes("/database/url");
         it = list.iterator();
         while (it.hasNext()) {
             Element item = (Element) it.next();
             url = item.getText();
         }

         list = document.selectNodes("/database/user");
         it = list.iterator();
         while (it.hasNext()) {
             Element item = (Element) it.next();
             user = item.getText();
         }

         list = document.selectNodes("/database/password");
         it = list.iterator();
         while (it.hasNext()) {
             Element item = (Element) it.next();
             password = item.getText();
         }
     }

     /**
      * 获取数据库连接
      *
      * @return 连接对象
      */
     public static Connection getConnection() {
         try {
             return conn = DriverManager.getConnection(url, user, password);
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
     }

     /**
      * 释放ResultSet资源
      *
      * @param rs
      */
     public static void close(ResultSet rs) {
         try {
             if (null != rs)
                 rs.close();
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
     }

     /**
      * 释放PreparedStatement资源
      *
      * @param ptmt
      */
     public static void close(PreparedStatement ptmt) {
         try {
             if (null != ptmt)
                 ptmt.close();
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
     }

     /**
      * 释放Connection资源
      *
      * @param conn
      */
     public static void close(Connection conn) {
         try {
             if (null != conn)
                 conn.close();
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
     }

     /**
      * 释放所有资源
      */
     public static void close() {
         try {
             if (null != rs && !rs.isClosed()) {
                 rs.close();
             }
             rs = null;
         } catch (SQLException e) {
             throw new RuntimeException(e);
         } finally {
             try {
                 if (null != ptmt && !ptmt.isClosed()) {
                     ptmt.close();
                 }
                 ptmt = null;
             } catch (SQLException e) {
                 throw new RuntimeException(e);
             } finally {
                 try {
                     System.out.println(conn);
                     if (null != conn && !conn.isClosed()) {
                         conn.close();
                     }
                     conn = null;
                 } catch (SQLException e) {
                     throw new RuntimeException(e);
                 }
             }
         }
     }

     /**
      * 执行增删改
      *
      * @param sql
      *            待执行的SQL语句
      * @param params
      *            SQL语句中?占位符的参数
      * @return 受影响的行数
      */
     public static int executeUpdate(String sql, Object... params) {
         try {
             if (null == conn)
                 getConnection();
             ptmt = conn.prepareStatement(sql);
             if (null != params) { // 为SQL语句中?占位符设置参数
                 for (int i = 0; i < params.length; i++) {
                     ptmt.setObject(i + 1, params[i]);
                 }
             }
             int cnt = ptmt.executeUpdate();
             return cnt;
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
     }

     /**
      * 执行查询操作
      *
      * @param sql
      * @param params
      * @return 查询出来的结果集
      */
     public static ResultSet executeQuery(String sql, Object... params) {
         try {
             ptmt = conn.prepareStatement(sql);
             if (null != params) {
                 for (int i = 0; i < params.length; i++) { // 为每个?占位符设置参数
                     ptmt.setObject(i + 1, params[i]);
                 }
             }
             return rs = ptmt.executeQuery();
         } catch (SQLException e) {
             throw new RuntimeException("执行查询操作失败", e);
         }
     }

     /**
      * 查询
      */
     public static ResultSet executeQuery(String sql) {

         try {
             ptmt = conn.prepareStatement(sql);
         } catch (SQLException e1) {
             e1.printStackTrace();
         }
         try {
             return rs = ptmt.executeQuery();
         } catch (SQLException e) {
             e.printStackTrace();
         }
         return rs;

     }

 }

 package test;

 import java.sql.ResultSet;
 import java.util.Scanner;

 import test.dao.PetDao;
 import test.dao.impl.PetDaoMySQLImpl;
 import test.entity.Master;
 import test.entity.Pet;

 /**
  * 用户的能力
  * @author acer
  *
  */
 public class MasterManger {
     /**
      * 登录主菜单
      * @throws Exception
      */
     public void frist() throws Exception{
         Scanner input = new Scanner(System.in);
         System.out.println("欢迎来到宠物上世界！");
         System.out.println("请选择。。。。。\n1 登录    2 注册   3退出");
         int choose = input.nextInt();
         switch(choose){
         case 1:
             login();
             break;
         case 2:
             register();
             break;
         case 3:
             System.exit(0);
         }
     }
     /**
      *
      * 新用户注册
      * @throws Exception
      */
     public void register() throws Exception{
         Scanner input=new Scanner(System.in);
         System.out.print("请注册你的用户名：");
         String username = input.next();
         System.out.print("请注册你的密码：");
         String password = input.next();
         System.out.print("请注册你的名字：");
         String name = input.next();
         System.out.print("请注册你的地址：");
         String address = input.next();
         System.out.print("请注册你的电话号码：");
         int phone = input.nextInt();
         Master master=new Master(username,password,name,address,phone);
         //保存到数据库中
         PetDao dao=new PetDaoMySQLImpl();
         int cnt=dao.save(master);
         System.out.println("注册成功！\n您可以登录了！！！");
         login();
     }

     /**
      * 主人登录
      * @throws Exception
      */
     public void login() throws Exception{
         Scanner input = new Scanner(System.in);
         System.out.print("请输入你的用户名：");
         String username= input.next();
         System.out.print("请输入你的密码：");
         String password = input.next();
         String sql="select * from master where username=? and password=?";
         JdbcUtil.getConnection();
         //执行查询
         ResultSet rs=JdbcUtil.executeQuery(sql,username,password);
         if(rs.next()){
             System.out.println("主人登录成功！");
             System.out.println("主人的基本信息：");
             System.out.println("编码："+rs.getInt("id")+"\n姓名："+rs.getString("name")+
                     "\n地址："+rs.getString("address")+"\n电话："+rs.getInt("phone"));
             menu();
         }
         else{
             System.out.println("1 用户名或密码错误");
             System.out.println("2 还是您还没有注册呢！");
             int start=input.nextInt();
             if(start==1){
                  login() ;
             }
             else if(start==2){
                 register();
             }

         }
     }

     /**
      * 4 根据id号查询宠物信息
      * @throws Exception
      */

    public void findPetById() throws Exception{
        Scanner input=new Scanner(System.in);
        System.out.println("请输入你查询的宠物id号：");
        int id=input.nextInt();
        String sql="select * from pet where id=?";
        JdbcUtil.getConnection();
        ResultSet rs=JdbcUtil.executeQuery(sql, id);
        System.out.println("这是你查找的宠物信息！！");
        if(rs.next()){
            if(rs.getString("gender").equals("无")){
                  System.out.println("宠物狗");
                  System.out.println("编号："+rs.getInt("id")+"\t名字："+rs.getString("name")+"\t亲密值："
              +rs.getInt("love")+"\t健康值："+rs.getInt("health")+"\t品种："+rs.getString("varietiess"));
              }
              else{
                  System.out.println("\n宠物企鹅");
                  System.out.println("编号："+rs.getInt("id")+"\t名字："+rs.getString("name")+"\t亲密值："
                          +rs.getInt("love")+"\t健康值："+rs.getInt("health")+"\t性别："+rs.getString("gender"));
              }
        }

    } 

    /**
     * 1 查询所有没有被领养的宠物
     * @throws Exception
     */

     public void findAllNoMaster() throws Exception{
         String sql="select * from pet where masterId=0";
         JdbcUtil.getConnection();
         ResultSet rs=JdbcUtil.executeQuery(sql);
          System.out.println("这些是还没有被领养的宠物");
     while(rs.next()){
          if(rs.getString("gender").equals("无")){
              System.out.println("宠物狗");
              System.out.println("编号："+rs.getInt("id")+"\t名字："+rs.getString("name")+"\t亲密值："
          +rs.getInt("love")+"\t健康值："+rs.getInt("health")+"\t品种："+rs.getString("varietiess"));
          }
          else{
              System.out.println("\n宠物企鹅");
              System.out.println("编号："+rs.getInt("id")+"\t名字："+rs.getString("name")+"\t\t亲密值："
                      +rs.getInt("love")+"\t健康值："+rs.getInt("health")+"\t性别："+rs.getString("gender"));
          }
      }

     }

     /**
      * 2 查询自己所养的宠物
      * @throws Exception
      */

     public void myPet() throws Exception{
         Scanner input = new Scanner(System.in);
         System.out.println("请输入你的ID号：");
         int id=input.nextInt();
         String sql="select * from pet where masterId=?";
         JdbcUtil.getConnection();
         ResultSet rs = JdbcUtil.executeQuery(sql,id);
          System.out.println("这是您的宠物信息！！");
          while(rs.next()){
              if(rs.getString("gender").equals("无")){
                  System.out.println("宠物狗");
                  System.out.println("编号："+rs.getInt("id")+"\t名字："+rs.getString("name")+"\t亲密值："
              +rs.getInt("love")+"\t健康值："+rs.getInt("health")+"\t品种："+rs.getString("varietiess"));
              }
              else{
                  System.out.println("宠物企鹅");
                  System.out.println("编号："+rs.getInt("id")+"\t名字："+rs.getString("name")+"\t\t亲密值："
                          +rs.getInt("love")+"\t健康值："+rs.getInt("health")+"\t性别："+rs.getString("gender"));
              }
          }
     }

     /**
      * 领养宠物
      */
     public void adoptPet(){ 

         Scanner input = new Scanner(System.in);
         System.out.println("请输入你的编号：");
         int id=input.nextInt();
         System.out.println("请输入你要领养宠物的编号：");
         int num=input.nextInt();
         Pet pet=new Pet(id,num);
         PetDao dao=new PetDaoMySQLImpl();
         int cnt=dao.adoptPet(pet);

         if(cnt==1){
         System.out.println("领养成功！！");
         }else{
             System.out.println("领养失败！");
         }
     }

     /**
      * 弃养自己的宠物
      */

     public void updatePet(){
         Scanner input = new Scanner(System.in);
         System.out.println("请输入你要弃养宠物的名字：");
         String name=input.next();
         System.out.println("请确认你所弃养的宠物编号：");
         int id=input.nextInt();
         Pet pet=new Pet(name,id);
         PetDao dao=new PetDaoMySQLImpl();
         int cnt=dao.updatePet(pet);
         if(cnt==1){
         System.out.println("就这样放弃了您的宠物！！！");
         }else{
             System.out.println("弃养宠物失败！");
         }

     }

   /**
    *
    * 功能主菜单
  * @throws Exception
    */
     public void menu() throws Exception{
         Scanner input =new Scanner(System.in);
         System.out.println("\n请选择。。。");
         while (true){
         System.out.println("1 查看当前系统中未被领养的宠物\n2 查看自己已领养的所有宠物的信息\n3"
                 + " 根据编号查询宠物信息\n4 弃养自己已领养的宠物\n5 可以领养宠物\n6 退出系统");
         int choose=input.nextInt();
         switch(choose){
         case 1:
             findAllNoMaster();
             break;
         case 2:
              myPet();
             break;
         case 3:
             findPetById();
             break;
         case 4:
              myPet();
              updatePet();
             break;
         case 5:
             findAllNoMaster();
             adoptPet();
             break;
         case 6:
             System.exit(0);
         }
         }
     }

 }

测试类

1 package test;

 public class Test {
   public static void main(String[] args) throws Exception {
       MasterManger u=new MasterManger();
        u.frist();
   }
 }

实体类

 package test.entity;
 /**
  * 第二步  实体
  * 宠物类
  * @author acer
  *
  */
 public class Pet {

     private int id;//编号
     private String name;//名称
     private int love;//亲密值
     private int health;//健康值
     private int masterId;//所属主人编号
     public Pet() {
         super();
     }
     public Pet(int id, String name, int love, int health, int masterId) {
         super();
         this.id = id;
         this.name = name;
         this.love = love;
         this.health = health;
         this.masterId = masterId;
     }

     public Pet(int masterId) {
         super();
         this.masterId = masterId;
     }

     public Pet(String name) {
         super();
         this.name = name;
     }

     public Pet(int masterId, int id ) {
         super();
         this.id = id;
         this.masterId = masterId;
     }
     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 int getLove() {
         return love;
     }
     public void setLove(int love) {
         this.love = love;
     }
     public int getHealth() {
         return health;
     }
     public void setHealth(int health) {
         this.health = health;
     }
     public int getMasterId() {
         return masterId;
     }
     public void setMasterId(int masterId) {
         this.masterId = masterId;
     }

     public Pet(String name,int id ) {
         super();
         this.id = id;
         this.name = name;
     }
     @Override
     public String toString() {
         return "Pet [id=" + id + ", name=" + name + ", love=" + love
                 + ", health=" + health + ", masterId=" + masterId + "]";
     }

 }

 package test.entity;
 /**
  * 宠物狗
  * @author acer
  *
  */
 public class Dogs extends Pet {
     public String varieties;//品种

     public Dogs(){
     }

     public Dogs(int id, String name, int love, int health, int masterId,
             String varieties) {
         super(id, name, love, health, masterId);
         this.varieties = varieties;
     }

     public String getVarieties() {
         return varieties;
     }

     public void setVarieties(String varieties) {
         this.varieties = varieties;
     }

     @Override
     public String toString() {
         return "Dogs [varieties=" + varieties + "+ super.toString() + ";
     }

 }

 package test.entity;
 /**
  * 主人类
  * @author acer
  *
  */
 public class Master {

     private int id;
     private String username;
     private String password;
     private String name;
     private String address;
     private int phone;

     public Master(int id) {
         super();
         this.id = id;
     }

     public Master(String username, String password, String name,
             String address, int phone) {
         super();
         this.username = username;
         this.password = password;
         this.name = name;
         this.address = address;
         this.phone = phone;
     }

     public Master(int id, String username, String password, String name,
             String address, int phone) {
         super();
         this.id = id;
         this.username = username;
         this.password = password;
         this.name = name;
         this.address = address;
         this.phone = phone;
     }

     public int getId() {
         return id;
     }

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

     public String getUsername() {
         return username;
     }

     public void setUsername(String username) {
         this.username = username;
     }

     public String getPassword() {
         return password;
     }

     public void setPassword(String password) {
         this.password = password;
     }

     public String getName() {
         return name;
     }

     public void setName(String name) {
         this.name = name;
     }

     public String getAddress() {
         return address;
     }

     public void setAddress(String address) {
         this.address = address;
     }

     public int getPhone() {
         return phone;
     }

     public void setPhone(int phone) {
         this.phone = phone;
     }

     @Override
     public String toString() {
         return "Master [id=" + id + ", username=" + username + ", password="
                 + password + ", name=" + name + ", address=" + address
                 + ", phone=" + phone + "]";
     }

 }

 package test.entity;
 /**
  * 企鹅类
  * @author acer
  *
  */
 public class Penguin extends Pet{
     private String gender;
     public Penguin(){

     }
     public Penguin(int id, String name, int love, int health, int masterId,
             String gender) {
         super(id, name, love, health, masterId);
         this.gender = gender;
     }
     public String getGender() {
         return gender;
     }
     public void setGender(String gender) {
         this.gender = gender;
     }
     @Override
     public String toString() {
         return "Penguin [gender=" + gender + "" + super.toString()
                 + "]";
     }

 }

DAO接口

 package test.dao;
 /**
  * 第三步： DAO接口
  */
 import java.sql.ResultSet;
 import test.entity.Master;
 import test.entity.Pet;

 public interface PetDao {
     /**
      * 用于注册新的用户
      * @param master
      * @return
      */

     int save(Master master);
     /**
      * 2 查看没有被领养的宠物
      *
      * @return 宠物
      */
     ResultSet noMasterPet();

     /**
      * 根据编号查询宠物信息
      */
     ResultSet getPetById(int id);
     /**
      * 查看自己的宠物
      */
     ResultSet myPet(int id);
     /**
      * 领养宠物
      */
     int adoptPet(Pet pet);
     /**
      *
      * 弃养自己的宠物
      */
     int updatePet(Pet pet);
      }

DAO接口实现类

 package test.dao.impl;

 /**
  * 第四步  DAO接口实现类
  *
  */
 import java.sql.ResultSet;

 import test.JdbcUtil;
 import test.dao.PetDao;
 import test.entity.Master;
 import test.entity.Pet;

 public class PetDaoMySQLImpl implements PetDao {
     /**
      * 注册 成功
      */
     @Override
     public int save(Master master) {
         // 1 SQL语句
         String sql = "insert into master(username,password,name,address,phone) values (?,?,?,?,?)";
         // 2 建立连接
         JdbcUtil.getConnection();
         // 3 执行操作
         int cnt = JdbcUtil.executeUpdate(sql, master.getUsername(),
                 master.getPassword(), master.getName(), master.getAddress(),
                 master.getPhone());
         // 4 释放资源
         JdbcUtil.close();
         return cnt;
     }

     /**
      * 没有被领养的宠物 成功
      */
     @Override
     public ResultSet noMasterPet() {
         String sql = "select * from pet where masterId =0";
         JdbcUtil.getConnection();
         ResultSet rs = JdbcUtil.executeQuery(sql);
         JdbcUtil.close();
         return rs;
     }

     /**
      * 根据id号查找宠物 成功
      */
     @Override
     public ResultSet getPetById(int id) {
         String sql = "select * form pet where id=?";
         JdbcUtil.getConnection();
         ResultSet rs = JdbcUtil.executeQuery(sql, id);
         JdbcUtil.close();
         return rs;
     }

     /**
      * 查询自己的宠物 成功
      *
      */
     @Override
     public ResultSet myPet(int id) {
         String sql = "select * from pet where masterId=?";
         JdbcUtil.getConnection();
         ResultSet rs = JdbcUtil.executeQuery(sql, id);
         JdbcUtil.close();
         return rs;

     }

     /**
      * 领养宠物
      *
      */
     @Override
     public int adoptPet(Pet pet) {
         String sql = "update pet set masterId=? where id=?";
         JdbcUtil.getConnection();
         int cnt = JdbcUtil.executeUpdate(sql, pet.getMasterId(), pet.getId());
         JdbcUtil.close();
         return cnt;
     }

     /**
      *
      * 弃养自己的宠物
      */
     @Override
     public int updatePet(Pet pet) {
         String sql = "update pet set masterId=0 WHERE name=? and id=?";
         JdbcUtil.getConnection();
         int cnt = JdbcUtil.executeUpdate(sql, pet.getName(), pet.getId());
         JdbcUtil.close();
         return cnt;
     }

 }

数据库内容

 create table pet(
 id int not null primary key auto_increment,
 name varchar(50) not null,
 love int not null,
 health  int not null,
 varietiess varchar(20),
 gender varchar(10),
 masterId int
 );

 create table master(
 id int not null primary key auto_increment,
 username varchar(50) not null,
 password varchar(50) not null,
 name varchar(50) not null,
 address varchar(100) not null,
 phone int not null
 );

 insert into pet values (null,'小狗one',90,90,'牧羊犬','无',1);
 insert into pet values (null,'小狗two',90,90,'牧羊犬','无',2);
 insert into pet values (null,'小狗three',90,90,'牧羊犬','无',3);
 insert into pet values (null,'小狗four',90,90,'牧羊犬','无',0);
 insert into pet values (null,'小狗five',90,90,'牧羊犬','无',0);
 insert into pet values (null,'小狗six',90,90,'牧羊犬','无',0);

 insert into pet values (null,'企鹅1',89,89,'无','男',1);
 insert into pet values (null,'企鹅2',89,89,'无','女',0);
 insert into pet values (null,'企鹅3',89,89,'无','男',0);
 insert into pet values (null,'企鹅4',89,89,'无','女',0);
 insert into pet values (null,'企鹅5',89,89,'无','男',2);

 insert into master values (null,'one','one1','张三','四川成都',4914676);
 insert into master values (null,'two','two2','李四','四川成都',4914671);
 insert into master values (null,'three','three3','王五','四川成都',4914672);
 insert into master values (null,'four','four4','小明','四川成都',4914673);
 insert into master values (null,'five','five5','小鬼','四川成都',4914674);