lrf_BookPrj.zip

package net.lrf.actions; import java.io.IOException; import java.io.PrintWriter; import java.util.List; import javax.servlet.ServletContext; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import net.lrf.entitys.Book; import net.lrf.services.BookService; /** * 显示图书信息 */ @WebServlet("/book.action") public class BooksInfoServlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public BooksInfoServlet() { super(); } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse * response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 获取PrintWriter对象 PrintWriter writer = response.getWriter(); // 检测用户是否已经登录,并区分登录的身份 // 登录身份不同显示的页面不同(添加图书和对图书的删除只有管理员身份登录时才会显示) // 管理员可以对图书进行浏览、删除、添加操作,也可以加入购物车； // 普通用户只能加入购物车 ServletContext context = getServletContext(); Object user = context.getAttribute("user"); String logIn = (String) context.getAttribute("admin"); List<Object> userLogin = (List<Object>) context.getAttribute("userLogin"); int totalNum; if (null == user) {// 还未登录 writer.write("您还未登录，<a href='login.html'>点此重新登录</a>"); } else if (logIn == null) { writer.write("请选择登录身份！<a href='login.html'>点此重新登录</a>"); // 当登录失败时，访问人数为List的长度-1，并在List记录中删除最近添加的记录 totalNum = userLogin.size() - 1; userLogin.remove(totalNum); } else { // 只有当登录成功时，才算入到访问人数 totalNum = userLogin.size(); // 获取图书信息 BookService bookService = new BookService(); List<Book> books = bookService.getBooks("select * from Book"); // 以表格形式将图书信息返回给客户端浏览器 // 打印表格表头 writer.write("<table border='1'>"); writer.write("<tr align='center'>"); writer.write("<th width='30'>编号</th>"); writer.write("<th width='150'>图书名称</th>"); writer.write("<th width='100'>图书价格</th>"); writer.write("<th width='150'>出版社</th>"); writer.write("<th>图书介绍</th>"); if (logIn.equals("1")) {// 管理员身份登录时显示 writer.write("<th width='50'>删除</th>"); writer.write("<th width='50'>修改</th>"); } writer.write("<th width='100'>加入购物车</th>"); writer.write("</tr>"); // 打印图书信息 for (Book book : books) { writer.write("<tr align='center'>"); // 打印图书编号 writer.write("<td>"); writer.write(new String((book.getBookId() + "").getBytes(), "utf-8")); writer.write("</td>"); // 打印图书名称 writer.write("<td>"); writer.write(book.getBookName()); writer.write("</td>"); // 打印图书价格 writer.write("<td>"); writer.write(book.getBookPrice() + ""); writer.write("</td>"); // 打印出版社 writer.write("<td>"); writer.write(book.getBookPublisher()); writer.write("</td>"); // 打印图书介绍 writer.write("<td align='left'>"); writer.write(book.getBookDesc()); writer.write("</td>"); if (logIn.equals("1")) {// 管理员身份登录时显示 // 删除图书 writer.write("<td align='center'>"); writer.write("<a href='deleteBook.action?bookName=" + book.getBookName() + "'>删除</a>"); writer.write("</td>"); // 修改图书 writer.write("<td align='center'>"); writer.write("<a href='updateBook.action?bookName=" + book.getBookName() + "&bookPrice=" + book.getBookPrice() + "&bookPublisher=" + book.getBookPublisher() + "&bookDesc=" + book.getBookDesc() + "'>修改</a>"); writer.write("</td>"); } // 加入购物车 writer.write("<td align='center'>"); writer.write("<a href='shopping.action?bookName=" + book.getBookName() + "&bookPrice=" + book.getBookPrice() + "'>加入购物车</a>"); writer.write("</td>"); writer.write("</tr>"); } writer.write("</table>"); writer.write("<br/><br/>"); if (logIn.equals("1")) {// 管理员身份登录时显示 writer.write("<a href='bookServlet.action'>添加新图书</a>"); writer.write("&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp"); } writer.write("<a href='createOrder.action'>查看历史订单</a>"); writer.write("&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp"); writer.write("<a href='ShowShoppingCart.action'>查看购物车</a>"); writer.write("&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp访问人数：" + totalNum); } } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse * response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }