showitems.java

来自「servletjsp一些应用程序」· Java 代码 · 共 60 行

JAVA

60 行

package coreservlets; 

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*; 

/** Servlet that displays a list of items being ordered.
 *  Accumulates them in an ArrayList with no attempt at
 *  detecting repeated items. Used to demonstrate basic
 *  session tracking.
 *  <P>
 *  Taken from Core Servlets and JavaServer Pages 2nd Edition
 *  from Prentice Hall and Sun Microsystems Press,
 *  http://www.coreservlets.com/.
 *  &copy; 2003 Marty Hall; may be freely used or adapted.
 */

public class ShowItems extends HttpServlet {
  public void doGet(HttpServletRequest request,
                    HttpServletResponse response)
      throws ServletException, IOException {
    HttpSession session = request.getSession();
    ArrayList previousItems =
      (ArrayList)session.getAttribute("previousItems");
    if (previousItems == null) {
      previousItems = new ArrayList();
      session.setAttribute("previousItems", previousItems);
    }
    String newItem = request.getParameter("newItem");
    response.setContentType("text/html");
    PrintWriter out = response.getWriter();
    String title = "Items Purchased";
    String docType =
      "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 " +
      "Transitional//EN\">\n";
    out.println(docType +
                "<HTML>\n" +
                "<HEAD><TITLE>" + title + "</TITLE></HEAD>\n" +
                "<BODY BGCOLOR=\"#FDF5E6\">\n" +
                "<H1>" + title + "</H1>");
    synchronized(previousItems) {
      if ((newItem != null) &&
          (!newItem.trim().equals(""))) {
        previousItems.add(newItem);
      }
      if (previousItems.size() == 0) {
        out.println("<I>No items</I>");
      } else {
        out.println("<UL>");
        for(int i=0; i<previousItems.size(); i++) {
          out.println("<LI>" + (String)previousItems.get(i));
        }
        out.println("</UL>");
      }
    }
    out.println("</BODY></HTML>");
  }
}

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