图书综合管理系统增删查改jspservlet基础优质项目BaseDao.docx

这是图书管理系统课后作业 增删查改 BaseDao jsp提交到servletBaseDao.java 数据库操作通用类package combook.dao;import java.sql.*;import com.dao.util.ConfigManager;import common.*;public class BaseDao /数据库操作通用类protected Connection conn;/*定义静态变量接收加载驱动*/private static String driver;/*定义静态变量得到连接*/private static String url;private static String userName;/数据库用户名private static String password;/数据库密码/静态Connection 对象 staticdriver=ConfigManager.getInstance().getString(driver);url=ConfigManager.getInstance().getString(url);userName=ConfigManager.getInstance().getString(userName);password=ConfigManager.getInstance().getString(password);protected ResultSet rs;protected Statement stmt;protected PreparedStatement ps;/获取链接方法public boolean getConnection()if(conn!=null)/判定连接对象是否为空 return false;try Class.forName(driver);/加载驱动/依据url，用户名和密码获取链接 获取是connection对象conn=DriverManager.getConnection(url,userName,password); catch (ClassNotFoundException e) e.printStackTrace(); catch (SQLException e) e.printStackTrace();return true;/增删改方法 子类能够调用这个方法 帮助实施sql语句public int execute(String sql,Objectparams)try ps=conn.prepareStatement(sql);/预编译传过来sql语句if(params!=null)/假如子类传过来参数不为空话 遍历循环 判定使参数兼容for (int i = 0; i params.length; i+) /遍历参数数组Object obj=paramsi;/参数是Object类型所以Object先接收 然后判定if(obj instanceof String)ps.setString(i+1), (String)obj);/假如该参数是String类型 就强转设置 数组该位置元素是String类型 else if(obj instanceof Integer)ps.setInt(i+1), (Integer)obj);else if(obj=null)/这么判定一下因为有图片传入 判定不了类型obj=;/赋值为空ps.setString(i+1), (String)obj);/默认设置为String类型/实施sqlint count=ps.executeUpdate();return count; catch (SQLException e) e.printStackTrace();return 0;/获取结果集方法public ResultSet excuteSql(String sql,Objectparams)try rs=ps.executeQuery(sql);for (int i = 0; i params.length; i+) if(paramsi instanceof String)ps.setString(i+1), (String)paramsi);else if(paramsi instanceof Integer)ps.setInt(i+1), (Integer)paramsi); catch (SQLException e) e.printStackTrace(); return rs;public boolean closeResource()if(rs!=null)try rs.close(); catch (SQLException e) e.printStackTrace();return false;if(ps!=null)try ps.close(); catch (SQLException e) e.printStackTrace();return false;if(conn!=null)try conn.close();conn=null; catch (SQLException e) e.printStackTrace();return false;return true;/方法重载 假如需要关闭多个资源就选择哪个方法public void closeResource(Connection conn)if(conn=null)try conn.close(); catch (SQLException e) e.printStackTrace();Dao层接口 -BookDao.javapackage combook.dao;import java.util.List;import combook.dto.Book;import common.dto.PageDto;public interface BookDao public List getBooksList(PageDto pagedto)throws Exception;/取得图书集合方法-全部信息/增加一本图书信息 public int insertBooks(Book book)throws Exception;/依据图书编号删除新闻public int delete(int bid)throws Exception;/修改信息 -传入是图书对象public int update(Book book)throws Exception;/依据图书编号查找该图书/依据图书编号查找该图书public Book query(int bid) throws Exception;public List query(String bookname) throws Exception;/取得总统计方法public int getAllRowCount() throws Exception;BookImpl.java 实现类 实现了接口 继承了BaseDao.javapackage combook.dao.impl;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.Statement;import java.util.ArrayList;import java.util.List;import combook.dao.BaseDao;import combook.dao.BookDao;import combook.dto.Book;import common.dto.PageDto;public class BookImpl extends BaseDao implements BookDao/1、查询全部信息 返回一个 带有泛型集合public List getNewsList() throws Exception /定义一个集合 集合是对应要返回出去 泛型集合List bookList=new ArrayList(); super.getConnection();/取得连接 经过父类方法 conn.prepareStatement(select * from news); rs=ps.executeQuery();/返回结果集while(rs.next()/循环结果集中数据判定结果集中是否还有下一个内容Book book=new Book();/创建一个实例对象/把结果集中图书信息封装到图书对象中去book.setBid(rs.getInt(bid);book.setBookName(rs.getString(bookName);book.setImage(rs.getString(image);book.setPrice(Double.parseDouble(rs.getString(b_price);book.setStock(rs.getInt(stock);/将图书对象添加到集合中去 因为集合是带有图书泛型所以不需要强转 直接添加图书对象bookList.add(book);/调用父类方法释放资源super.closeResource();return bookList;/取得数据库中全部图书信息public List getBooksList(PageDto pagedto) throws Exception /新建一个带有book泛型集合List bookList=new ArrayList();super.getConnection();/第一步取得和数据库连接int start=pagedto.getStartIndex();/分页查询开始int end =pagedto.getEndIndex();/分页查询结束/写分页查询sql语句String sql=select * from (select b.*,rownum rn from books b) where rn=? and rn?;ps=conn.prepareStatement(sql);/预编译sql语句ps.setInt(1,start);/设置第一个参数值ps.setInt(2,end);/设置第二个参数值/实施查询语句rs=ps.executeQuery();/循环结果集数据while(rs.next()/实例化一个图书对象Book book =new Book();/把结果集中图书信息封装到图书对象中去book.setBid(rs.getInt(bid);book.setBookName(rs.getString(bookName);book.setImage(rs.getString(image);book.setPrice(Double.parseDouble(rs.getString(b_price);book.setStock(rs.getInt(stock);/将图书对象添加到集合中去 因为集合是带有图书泛型所以不需要强转 直接添加图书对象bookList.add(book);super.closeResource();return bookList;/向表中插入新书方法 传入是图书对象 返回影响行数public int insertBooks(Book book) throws Exception super.getConnection();/第一步取得和数据库连接/新建一个参数数组 填充占位符Object params=new Object5;params0=book.getBid();params1=book.getBookName();params2=book.getPrice();params3=book.getImage();params4=book.getStock();String sql=insert into book values(?,?,?,?,?);/预编译sql语句ps=conn.prepareStatement(sql);/实施更新数据库sql语句操作int count=super.execute(sql, params);super.closeResource();return count;/删除图书方法 依据穿过来图书idpublic int delete(int bid) throws Exception super.getConnection();/第一步取得和数据库连接/填充占位符Object params=new Object1;params0=bid;String sql=delete from book where bid=?;/删除sql语句/预编译sql语句ps=conn.prepareStatement(sql);/调用父类实施sqlint count=super.execute(sql, params);/释放资源super.closeResource();/返回受影响行数return count;/修改图书方法 传入图书对象public int update(Book book) throws Exception super.getConnection();/第一步取得和数据库连接/填充占位符Object params=new Object4;params0=book.getBookName();params1=book.getPrice();params2=book.getImage();params3=book.getStock();String sql=update book set bookname=?,b_price=?,image=?,stock=?;ps=conn.prepareStatement(sql);int count=super.execute(sql, params);super.closeResource();return count;public Book query(int bid) throws Exceptionsuper.getConnection();/第一步取得和数据库连接Book book=new Book();/填充占位符Object params=new Object1;params0=bid;String sql=select * from books where bid=?;conn.prepareStatement(sql);rs=super.excuteSql(sql, params);if(rs.next()/把结果集中图书信息封装到图书对象中去book.setBid(rs.getInt(bid);book.setBookName(rs.getString(bookName);book.setImage(rs.getString(image);book.setPrice(rs.getDouble(b_price);book.setStock(rs.getInt(stock);super.closeResource();return book;public List query(String bookname) throws Exception super.getConnection();/第一步取得和数据库连接/新建一个带有book泛型集合List bookList=new ArrayList();/填充占位符/Object params=new Object1;/params0=bookname;String sql=select * from books where bookname like ?;ps=conn.prepareStatement(sql);ps.setString(1, %+bookname+%);/rs=super.excuteSql(sql, params);rs=ps.executeQuery();while(rs.next()Book book=new Book();/把结果集中图书信息封装到图书对象中去book.setBid(rs.getInt(bid);book.setBookName(rs.getString(bookName);book.setImage(rs.getString(image);book.setPrice(rs.getDouble(b_price);book.setStock(rs.getInt(stock);bookList.add(book);super.closeResource();return bookList;public int getAllRowCount() throws Exception super.getConnection();/取得连接int count=0;/查找到全部统计String sql=select count(*) from books;ps=conn.prepareStatement(sql);/预编译sql语句rs=ps.executeQuery();/返回一个结果集if(rs.next()count=rs.getInt(1);/取得结果集第一条super.closeResource();return count;用户表 UserInfoDao.java 接口package combook.dao;import java.util.List;import combook.dto.Book;import combook.dto.UserInfo;import common.dto.PageDto;public interface UserInfoDao /传入一个用户对象 判定这个对象是否在数据库中存在public int queryObject(UserInfo user) throws Exception;/依据用户名查找该数据库表中有没有反复用用户 public int query(String userName) throws Exception;/增加一个用户信息 -传入一个用户对象public int insertUserInfo(UserInfo user)throws Exception;/修改信息 -传入是用户对象public int update(UserInfo user)throws Exception;UserInfoDaoImpl实现类package combook.dao.impl;import java.sql.SQLException;import java.util.List;import combook.dao.BaseDao;import combook.dao.UserInfoDao;import combook.dto.Book;import combook.dto.UserInfo;import common.dto.PageDto;public class UserInfoDaoImpl extends BaseDao implements UserInfoDao /向用户表中添加一个新用户信息public int insertUserInfo(UserInfo user) throws Exception super.getConnection();/第一步取得和数据库连接/定义数组 用于填充占位符Object params=new Object3;params0=user.getUserName();params1=user.getPassword();params2=user.getEmail();/定义一个sql语句向表中插入数据String sql=insert into userInfo values(?,?,?);/预编译sql语句/ps=conn.prepareStatement(sql);/ps.setString(1, x)/调用父类实施sql操作int count=super.execute(sql, params);super.closeResource();return count;public int update(UserInfo user) throws Exception return 0;/传入一个用户名判定这个用户名是否存在 返回一个查找统计public int query(String userName) throws Exception super.getConnection();/第一步取得和数据库连接int count=0;String sql=select count(*) from userInfo where userName=?;try /预编译sqlps=conn.prepareStatement(sql);/用ps填充占位符ps.setString(1, userName);rs=ps.executeQuery();/实施sql返回一个结果集/找到结果集第一条数据if(rs.next()count=rs.getInt(1); catch (SQLException e1) e1.printStackTrace();/释放资源super.closeResource();return count;public int queryObject(UserInfo user) throws Exception super.getConnection();/第一步取得和数据库连接String sql=select count(*) from userInfo where userName=? and passwords=?;/预编译sqlps=conn.prepareStatement(sql);/填充占位符ps.setString(1, user.getUserName();ps.setString(2, user.getPassword();/实施sql语句rs=ps.executeQuery();int count=0;/找到结果集第一条数据if(rs.next()count=rs.getInt(1);super.closeResource();return count;数据库当中表对应实体类 DTO层package combook.dto;/*图书类*/public class Book private int bid;/图书编号private String bookName;/图书名字private double price;/图书价格private String image;/图书图片private int stock;/库存public int getBid() return bid;public void setBid(int bid) this.bid = bid;public String getBookName() return bookName;public void setBookName(String bookName) this.bookName = bookName;public double getPrice() return price;public void setPrice(double price) this.price = price;public String getImage() return image;public void setImage(String image) this.image = image;public int getStock() return stock;public void setStock(int stock) this.stock = stock;用户表实体类package combook.dto;/*用户类*/public class UserInfo private String userName;/用户名private String password;/密码private String email;/邮箱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 getEmail() return email;public void setEmail(String email) this.email = email;注册servlet提交地址package combook.servlet;import java.io.IOException;import java.io.UnsupportedEncodingException;import java.sql.PreparedStatement;import java.sql.SQLException;import javax.servlet.ServletConfig;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import combook.dao.BaseDao;import combook.dao.UserInfoDao;import combook.dao.impl.UserInfoDaoImpl;import combook.dto.UserInfo;import combook.service.UserInfoService;import combook.service.impl.UserInfoServiceImpl;public class RegisterServlet extends HttpServlet/* * */private static final long serialVersionUID = 1L;protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException/在地址栏直接敲代码会调用doGetSystem.out.println(进入doGet方法);/调用doPost方法 实现代码重用省掉代码try doPost(request,response); catch (Exception e) e.printStackTrace();protected void doPost(HttpServletRequest request,HttpServletResponse response)System.out.println(进入doPost方法);try /取得表单提交过来用户名try request.setCharacterEncoding(utf-8); catch (UnsupportedEncodingException e1) e1.printStackTrace();/设置编码格式处理汉字乱码 response.setCharacterEncoding(utf-8);String userName=request.getParameter(userName);/实例化一个用户表数据层实例 UserInfoDao userInfo=new UserInfoDaoImpl(); /调用依据传入提交过来用户名查询取得该用户是否存在 返回一个int类型int count=userInfo.query(userName);if(count0)/说明该用户存在-跳到错误页面-返回重新注册response.sendRedirect(./jbook/registererror.jsp);else if(count=0)/说明能够进入下一步 -把新注册用户存到数据库中用户表中去/实例化用户表信息UserInfo user=new UserInfo();/封装表单提交过来表单数据/将提交过来表单元素值赋值给用户表对象Strin