JavaWeb书城项目-图书模块的更新功能

<div id="main">
        <table>
            <tr>
                <td>名称</td>
                <td>价格</td>
                <td>作者</td>
                <td>销量</td>
                <td>库存</td>
                <td colspan="2">操作</td>
            </tr>
            <c:forEach items="${requestScope.books}" var="book">
            <tr>
                <td>${book.name}</td>
                <td>${book.price}</td> 
                <td>${book.author}</td>
                <td>${book.sales}</td>
                <td>${book.stock}</td>
                <td><a href="manager/bookServlet?action=getBook&id=${book.id}">修改</a></td>
                <td><a class="deleteClass" href="manager/bookServlet?action=delete&id=${book.id}">删除</a></td>
            </tr>    
            
            </c:forEach>    
            
            <tr>
                <td></td>
                <td></td>
                <td></td>
                <td></td>
                <td></td>
                <td></td>
                <td><a href="pages/manager/book_edit.jsp">添加图书</a></td>
            </tr>    
        </table>
    </div>

 

<div id="main">
            <form action="manager/bookServlet" method="POST">
                <input type='hidden' name="action" value="${empty param.id? 'add':'update'}">
                <input type="hidden" name="id" value="${requestScope.book.id}">
                <table>
                    <tr>
                        <td>名称</td>
                        <td>价格</td>
                        <td>作者</td>
                        <td>销量</td>
                        <td>库存</td>
                        <td colspan="2">操作</td>
                    </tr>        
                    <tr>
                        <td><input name="name" type="text" value="${requestScope.book.name}"/></td>
                        <td><input name="price" type="text" value="${requestScope.book.price}"/></td>
                        <td><input name="author" type="text" value="${requestScope.book.author}"/></td>
                        <td><input name="sales" type="text" value="${requestScope.book.sales}"/></td>
                        <td><input name="stock" type="text" value="${requestScope.book.stock}"/></td>
                        <td><input type="submit" value="提交"/></td>
                    </tr>    
                </table>
            </form>
            
    
        </div>
        

 

 

 

    
    protected void getBook(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
        Integer id = WebUtils.parseInt(req.getParameter("id"), 0);
        Book book = bookService.queryBookById(id);
        req.setAttribute("book", book);
        req.getRequestDispatcher("/pages/manager/book_edit.jsp").forward(req, res);
    }
    
    protected void update(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
        Book book = WebUtils.copyParamToBean(req.getParameterMap(), new Book());
        bookService.updateBook(book);
        res.sendRedirect(req.getContextPath() + "/manager/bookServlet?action=list");
    }