1、創(chuàng)建相關(guān)類

• cn.itcast.bookstore.book
• domain：Book
• dao：BookDao
• service :BookService
• web.servle：BookServlet

Book

public class Book {private String bid;private String bname;private double price;private String author;private String image;private Category category;private boolean del; }

BookDao

public class BookDao {private QueryRunner qr = new TxQueryRunner();/*** 查詢所有圖書* @return*/public List<Book> findAll() {try {String sql = "select * from book where del=false";return qr.query(sql, new BeanListHandler<Book>(Book.class));} catch(SQLException e) {throw new RuntimeException(e);}}/*** 按分類查詢* @param cid* @return*/public List<Book> findByCategory(String cid) {try {String sql = "select * from book where cid=? and del=false";return qr.query(sql, new BeanListHandler<Book>(Book.class), cid);} catch(SQLException e) {throw new RuntimeException(e);}}/*** 加載方法* @param bid* @return*/public Book findByBid(String bid) {try {/** 我們需要在Book對象中保存Category的信息*/String sql = "select * from book where bid=?";Map<String,Object> map = qr.query(sql, new MapHandler(), bid);/** 使用一個Map，映射出兩個對象，再給這兩個對象建立關(guān)系！*/Category category = CommonUtils.toBean(map, Category.class);Book book = CommonUtils.toBean(map, Book.class);book.setCategory(category);return book;} catch(SQLException e) {throw new RuntimeException(e);}}/*** 查詢指定分類下的圖書本數(shù)* @param cid* @return*/public int getCountByCid(String cid) {try {String sql = "select count(*) from book where cid=?";Number cnt = (Number)qr.query(sql, new ScalarHandler(), cid);return cnt.intValue();} catch(SQLException e) {throw new RuntimeException(e);}}/*** 添加圖書* @param book*/public void add(Book book) {try {String sql = "insert into book values(?,?,?,?,?,?)";Object[] params = {book.getBid(), book.getBname(), book.getPrice(),book.getAuthor(), book.getImage(), book.getCategory().getCid()};qr.update(sql, params);} catch(SQLException e) {throw new RuntimeException(e);}}/*** 刪除圖書* @param bid*/public void delete(String bid) {try {String sql = "update book set del=true where bid=?";qr.update(sql, bid);} catch(SQLException e) {throw new RuntimeException(e);}}public void edit(Book book) {try {String sql = "update book set bname=?, price=?,author=?, image=?, cid=? where bid=?";Object[] params = {book.getBname(), book.getPrice(),book.getAuthor(), book.getImage(), book.getCategory().getCid(), book.getBid()};qr.update(sql, params);} catch(SQLException e) {throw new RuntimeException(e);}} }

BookService

public class BookService {private BookDao bookDao = new BookDao();/*** 查詢所有圖書* @return*/public List<Book> findAll() {return bookDao.findAll();}/*** 按分類查詢圖書* @param cid* @return*/public List<Book> findByCategory(String cid) {return bookDao.findByCategory(cid);}public Book load(String bid) {return bookDao.findByBid(bid);}/*** 　添加圖書* @param book*/public void add(Book book) {bookDao.add(book);}public void delete(String bid) {bookDao.delete(bid);}public void edit(Book book) {bookDao.edit(book);} }

BookServlet

public class BookServlet extends BaseServlet {private BookService bookService = new BookService();public String load(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {/** 1. 得到參數(shù)bid* 2. 查詢得到Book* 3. 保存，轉(zhuǎn)發(fā)到desc.jsp*/request.setAttribute("book", bookService.load(request.getParameter("bid")));return "f:/jsps/book/desc.jsp";}/*** 查詢所有圖書* @param request* @param response* @return* @throws ServletException* @throws IOException*/public String findAll(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setAttribute("bookList", bookService.findAll());return "f:/jsps/book/list.jsp";}/*** 按分類查詢* @param request* @param response* @return* @throws ServletException* @throws IOException*/public String findByCategory(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String cid = request.getParameter("cid");request.setAttribute("bookList", bookService.findByCategory(cid));return "f:/jsps/book/list.jsp";} }

2、查詢所有圖書

流程：left.jsp（全部分類） -> BookServlet#findAll() -> /jsps/book/list.jsp

3、按分類查詢圖書

流程：left.jsp -> BookServlet#findByCategory() -> list.jsp

4、查詢詳細信息（加載）

流程：list.jsp（點擊某一本書） -> BookServlet#load() -> desc.jsp

總結(jié)

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