📄 listlibraryservlet.java
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/* * ListLibraryServlet.java * * */package com.dvd.view;import com.dvd.model.DVDLibrary;import com.dvd.model.DVDItem;import java.io.*;import javax.servlet.*;import javax.servlet.http.*;import java.util.Iterator;import java.util.List;/** * * @author * @version */public class ListLibraryServlet extends HttpServlet { /** Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods. * @param request servlet request * @param response servlet response */ protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // Retrieve the session object (for user preferences) HttpSession session = request.getSession(); // retrieve the "library" attribute from the session-scope DVDLibrary library = (DVDLibrary)session.getAttribute("library"); List dvds = library.getDVDCollection(); response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println("<html>"); out.println("<head>"); out.println("<title>ListLibraryServlet</title>"); out.println("<body bgcolor='white'>"); out.println("You currently have <b>" + dvds.size() + "</b> DVDs in your collection:<br>"); out.println("<table border='0' cellspacing='0' cellpadding='5'>"); out.println("<tr>"); if ( session.getAttribute("showTitle") != null ) { out.println(" <th>TITLE</th>"); } if ( session.getAttribute("showYear") != null ) { out.println(" <th>YEAR</th>"); } if ( session.getAttribute("showGenre") != null ) { out.println(" <th>GENRE</th>"); } out.println("</tr>"); Iterator it = dvds.iterator(); while(it.hasNext()) { DVDItem item = (DVDItem) it.next(); out.println("<tr>"); if ( session.getAttribute("showTitle") != null ) { out.println(" <td>" + item.getTitle() + "</td>"); } if ( session.getAttribute("showYear") != null ) { out.println(" <td>" + item.getYear() + "</td>"); } if ( session.getAttribute("showGenre") != null ) { out.println(" <td>" + item.getGenre() + "</td>"); } out.println("</tr>"); } out.println("</table>"); out.println("<HR>"); out.println("</body>"); out.println("</html>"); out.close(); } // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code."> /** Handles the HTTP <code>GET</code> method. * @param request servlet request * @param response servlet response */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } /** Handles the HTTP <code>POST</code> method. * @param request servlet request * @param response servlet response */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } /** Returns a short description of the servlet. */ public String getServletInfo() { return "Short description"; } // </editor-fold> }⌨️ 快捷键说明
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