2020-12-17日报博客-周四

1. 学到的东西：

案例:图书管理系统的重新实现

package service;

import domain.Book;
import domain.PageBean;
import domain.User;

import java.util.List;
import java.util.Map;

/**
 * 用户管理的业务接口
 */
public interface BookService {


    public List<Book> findAll();


    void addBook(Book book);

    /**
     * 根据id删除User
     * @param id
     */
    void deleteBook(String id);

    /**
     * 根据id查询
     * @param id
     * @return
     */
    Book findBookById(String id);

    /**
     * 修改用户信息
     * @param book
     */
    void updateBook(Book book);

    /**
     * 批量删除用户
     * @param ids
     */
    void delSelectedBook(String[] ids);

    /**
     * 分页条件查询
     * @param currentPage
     * @param rows
     * @param condition
     * @return
     */
    PageBean<Book> findBookByPage(String currentPage, String rows, Map<String, String[]> condition);
}

package service;

import domain.Book;
import domain.BorrowInfo;
import domain.PageBean;

import java.util.List;
import java.util.Map;

/**
 * 用户管理的业务接口
 */
public interface BorrowInfoService {


    public List<BorrowInfo> findAll();


    void addBorrowInfo(BorrowInfo borrowInfo);

    /**
     * 根据id删除User
     * @param id
     */
    void deleteBorrowInfo(String id);

    /**
     * 根据id查询
     * @param id
     * @return
     */
    BorrowInfo findBorrowInfoById(String id);

    /**
     * 修改用户信息
     * @param borrowInfo
     */
//    void updateBorrowInfo(BorrowInfo borrowInfo);

    /**
     * 批量删除用户
     * @param ids
     */
    void delSelectedBorrowInfo(String[] ids);

    /**
     * 分页条件查询
     * @param currentPage
     * @param rows
     * @param condition
     * @return
     */
    PageBean<BorrowInfo> findBorrowInfoByPage(String currentPage, String rows, Map<String, String[]> condition);
}

package service;

import domain.PageBean;
import domain.User;

import java.util.List;
import java.util.Map;

/**
 * 用户管理的业务接口
 */
public interface UserService {

    /**
     * 查询所有用户信息
     * @return
     */
    public List<User> findAll();

    /**UserService
     * 登录方法
     * @param user
     * @return
     */
    User login(User user);

    /**
     * 保存User
     * @param user
     */
    void addUser(User user);

    /**
     * 根据id删除User
     * @param id
     */
    void deleteUser(String id);

    /**
     * 根据id查询
     * @param id
     * @return
     */
    User findUserById(String id);

    /**
     * 修改用户信息
     * @param user
     */
    void updateUser(User user);

    /**
     * 批量删除用户
     * @param ids
     */
    void delSelectedUser(String[] ids);

    /**
     * 分页条件查询
     * @param currentPage
     * @param rows
     * @param condition
     * @return
     */
    PageBean<User> findUserByPage(String currentPage, String rows, Map<String, String[]> condition);
}

package service.impl;

import dao.BookDao;
import dao.UserDao;
import dao.impl.BookDaoImpl;
import dao.impl.UserDaoImpl;
import domain.Book;
import domain.PageBean;
import domain.User;
import service.BookService;
import service.UserService;

import java.util.List;
import java.util.Map;

public class BookServiceImpl implements BookService {
    private BookDao dao = new BookDaoImpl();

    @Override
    public List<Book> findAll() {
        //调用Dao完成查询
        return dao.findAll();
    }


    @Override
    public void addBook(Book book) {
        dao.add(book);
    }

    @Override
    public void deleteBook(String id) {
        dao.delete(Integer.parseInt(id));
    }

    @Override
    public Book findBookById(String id) {
        return dao.findById(Integer.parseInt(id));
    }

    @Override
    public void updateBook(Book book) {
        dao.update(book);
    }

    @Override
    public void delSelectedBook(String[] ids) {
        if(ids != null && ids.length > 0){
            //1.遍历数组
            for (String id : ids) {
                //2.调用dao删除
                dao.delete(Integer.parseInt(id));
            }
        }

    }

    @Override
    public PageBean<Book> findBookByPage(String _currentPage, String _rows, Map<String, String[]> condition) {

        int currentPage = Integer.parseInt(_currentPage);
        int rows = Integer.parseInt(_rows);

        if(currentPage <=0) {
            currentPage = 1;
        }
        //1.创建空的PageBean对象
        PageBean<Book> pb = new PageBean<Book>();
        //2.设置参数
        pb.setCurrentPage(currentPage);
        pb.setRows(rows);

        //3.调用dao查询总记录数
        int totalCount = dao.findTotalCount(condition);
        pb.setTotalCount(totalCount);
        //4.调用dao查询List集合
        //计算开始的记录索引
        int start = (currentPage - 1) * rows;
        List<Book> list = dao.findByPage(start,rows,condition);
        pb.setList(list);

        //5.计算总页码
        int totalPage = (totalCount % rows)  == 0 ? totalCount/rows : (totalCount/rows) + 1;
        pb.setTotalPage(totalPage);

        return pb;
    }
}

package service.impl;

import dao.BookDao;
import dao.BorrowInfoDao;
import dao.impl.BookDaoImpl;
import dao.impl.BorrowInfoDaoImpl;
import domain.Book;
import domain.BorrowInfo;
import domain.PageBean;
import service.BookService;
import service.BorrowInfoService;

import java.util.List;
import java.util.Map;

public class BorrowInfoServiceImpl implements BorrowInfoService {
    private BorrowInfoDao dao = new BorrowInfoDaoImpl();

    @Override
    public List<BorrowInfo> findAll() {
        //调用Dao完成查询
        return dao.findAll();
    }


    @Override
    public void addBorrowInfo(BorrowInfo borrowInfo) {
        dao.add(borrowInfo);
    }

    @Override
    public void deleteBorrowInfo(String id) {
        dao.delete(id);
    }

    @Override
    public BorrowInfo findBorrowInfoById(String id) {
        return dao.findById(Integer.parseInt(id));
    }

    @Override
    public void delSelectedBorrowInfo(String[] ids) {
        if(ids != null && ids.length > 0){
            //1.遍历数组
            for (String id : ids) {
                //2.调用dao删除
                dao.delete(id);
            }
        }

    }

    @Override
    public PageBean<BorrowInfo> findBorrowInfoByPage(String _currentPage, String _rows, Map<String, String[]> condition) {

        int currentPage = Integer.parseInt(_currentPage);
        int rows = Integer.parseInt(_rows);

        if(currentPage <=0) {
            currentPage = 1;
        }
        //1.创建空的PageBean对象
        PageBean<BorrowInfo> pb = new PageBean<BorrowInfo>();
        //2.设置参数
        pb.setCurrentPage(currentPage);
        pb.setRows(rows);

        //3.调用dao查询总记录数
        int totalCount = dao.findTotalCount(condition);
        pb.setTotalCount(totalCount);
        //4.调用dao查询List集合
        //计算开始的记录索引
        int start = (currentPage - 1) * rows;
        List<BorrowInfo> list = dao.findByPage(start,rows,condition);
        pb.setList(list);

        //5.计算总页码
        int totalPage = (totalCount % rows)  == 0 ? totalCount/rows : (totalCount/rows) + 1;
        pb.setTotalPage(totalPage);

        return pb;
    }
}

package service.impl;

import dao.BookDao;
import dao.UserDao;
import dao.impl.BookDaoImpl;
import dao.impl.UserDaoImpl;
import domain.Book;
import domain.PageBean;
import domain.User;
import service.BookService;
import service.UserService;

import java.util.List;
import java.util.Map;

public class BookServiceImpl implements BookService {
    private BookDao dao = new BookDaoImpl();

    @Override
    public List<Book> findAll() {
        //调用Dao完成查询
        return dao.findAll();
    }


    @Override
    public void addBook(Book book) {
        dao.add(book);
    }

    @Override
    public void deleteBook(String id) {
        dao.delete(Integer.parseInt(id));
    }

    @Override
    public Book findBookById(String id) {
        return dao.findById(Integer.parseInt(id));
    }

    @Override
    public void updateBook(Book book) {
        dao.update(book);
    }

    @Override
    public void delSelectedBook(String[] ids) {
        if(ids != null && ids.length > 0){
            //1.遍历数组
            for (String id : ids) {
                //2.调用dao删除
                dao.delete(Integer.parseInt(id));
            }
        }

    }

    @Override
    public PageBean<Book> findBookByPage(String _currentPage, String _rows, Map<String, String[]> condition) {

        int currentPage = Integer.parseInt(_currentPage);
        int rows = Integer.parseInt(_rows);

        if(currentPage <=0) {
            currentPage = 1;
        }
        //1.创建空的PageBean对象
        PageBean<Book> pb = new PageBean<Book>();
        //2.设置参数
        pb.setCurrentPage(currentPage);
        pb.setRows(rows);

        //3.调用dao查询总记录数
        int totalCount = dao.findTotalCount(condition);
        pb.setTotalCount(totalCount);
        //4.调用dao查询List集合
        //计算开始的记录索引
        int start = (currentPage - 1) * rows;
        List<Book> list = dao.findByPage(start,rows,condition);
        pb.setList(list);

        //5.计算总页码
        int totalPage = (totalCount % rows)  == 0 ? totalCount/rows : (totalCount/rows) + 1;
        pb.setTotalPage(totalPage);

        return pb;
    }
}

2. 遇到的问题:

3. 明日计划:继续完成图书管理系统