📄 adddvdformservlet.java
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/* * AddDVDFormServlet.java * * */package com.dvd.view;import java.io.*;import java.util.Iterator;import java.util.List;import javax.servlet.*;import javax.servlet.http.*;/** * * @author * @version */public class AddDVDFormServlet 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 { // Specify the content type is HTML response.setContentType("text/html"); PrintWriter out = response.getWriter(); // Generate the HTML response out.println("<html>"); out.println("<head>"); out.println(" <title>DVD Library Application: Add DVD Form (Servlet)</title>"); out.println("</head>"); out.println("<body>"); // Generate main body out.println("<h1>Add DVD</h1>"); List errorMsgs = (List) request.getAttribute("errorMsgs"); if(errorMsgs != null) { out.println("<h2>Error Messages</h2>"); out.println("<font color='red'>Please correct the following errors:"); out.println("<ul>"); Iterator items = errorMsgs.iterator(); while ( items.hasNext() ) { String message = (String) items.next(); out.println(" <li>" + message + "</li>"); } out.println("</ul>"); out.println("</font><p>"); } String title = request.getParameter("title"); String year = request.getParameter("year"); String genre = request.getParameter("genre"); String newGenre = request.getParameter("newGenre"); out.println("<form action='add_dvd.do' method='POST'>"); // Display the title field out.print(" Title: <input type='text' name='title' "); if(title == null) { title = ""; } out.println("value = '" + title + "' /> <br/><br/>"); // Display the year field out.print(" Year: <input type='text' name='year' "); if(year == null) { year = ""; } out.println("value = '" + year + "' /> <br/><br/>"); // Repopulate the Genre drop-down menu out.println(" Genre: <select name='genre'>"); for ( int i = 0; i < genres.length; i++ ) { out.print(" <option value='" + genres[i] + "'"); if(genre != null && genre.equals(genres[i])) { out.print(" SELECTED"); } out.println("> " + genres[i] + "</option>"); } out.println(" </select>"); out.print(" or new genre: <input type='text' name='newGenre' "); if(newGenre == null) { newGenre = ""; } out.println("value = '" + newGenre + "'/> <br/><br/>"); out.println(" <input type='Submit' value='Add DVD' />"); out.println("</form>"); 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> private String[] genres = null; public void init() throws ServletException { // Specify the content type is HTML String genre_list = getInitParameter("genre-list"); if ( genre_list == null ) { genre_list = "Comedy,Action,Drama"; } genres = genre_list.split(","); }}⌨️ 快捷键说明
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