📄 bookdetailsservlet.java
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package servlets;import java.io.*;import javax.servlet.*;import javax.servlet.http.*;import database.*;import util.Currency;import exception.*;public class BookDetailsServlet extends HttpServlet { private BookDBAO bookDB; public void init() throws ServletException { bookDB = (BookDBAO) getServletContext() .getAttribute("bookDB"); if (bookDB == null) { throw new UnavailableException("Couldn't get database."); } } public void destroy() { bookDB = null; } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { HttpSession session = request.getSession(true); // 设置 content-type response.setContentType("text/html;charset=gb2312"); response.setBufferSize(8192); PrintWriter out = response.getWriter(); // 把数据写入响应流 out.println("<html>" + "<head><title>BookStore</title></head>"); // Get the dispatcher; it gets the banner to the user RequestDispatcher dispatcher = getServletContext() .getRequestDispatcher("/head"); if (dispatcher != null) { dispatcher.include(request, response); } //取得dispatcher对象，将页首放在本页面 String bookId = request.getParameter("bookId"); if (bookId != null) { // 书目的详细信息 try { BookDetails bd = bookDB.getBookDetails(bookId); Currency c = (Currency) session.getAttribute("currency"); if (c == null) { c = new Currency(); c.setLocale(request.getLocale()); session.setAttribute("currency", c); } c.setAmount(bd.getPrice()); out.println("<center><h2>" + bd.getTitle() + "</h2>" + " " + "作者：" + " <em>" + bd.getName() + "</em> " + "(" + bd.getYear() + ")<br> <br>" + "<h4>" + "书评：" + "</h4>" + "<blockquote>" + bd.getDescription() + "</blockquote>" + "<h4>" + "价格：" + c.getFormat() + "</h4>" + "<p><strong><a href=\"" + response.encodeURL(request.getContextPath() + "/bookcatalog?bookId=" + bookId) + "\">" + "加入购物车" + "</a> " + "<a href=\"" + response.encodeURL(request.getContextPath() + "/bookcatalog") + "\">" + "继续购物" + "</a></p></strong></center>"); } catch (BookNotFoundException ex) { response.resetBuffer(); throw new ServletException(ex); } } out.println("</body></html>"); out.close(); } public String getServletInfo() { return "The BookDetail servlet returns information about" + "any book that is available from the bookstore."; }}⌨️ 快捷键说明
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