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📄 catalogservlet.java

📁 介绍了j2ee开发常用的学习知识,如servlet,javamail,EJB等知识,并有项目源码.
💻 JAVA
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/*
 * CatalogServlet.java
 *
 * Created on 2007年10月16日, 下午8:39
 */

package com.servlet;

import java.io.*;
import java.util.HashMap;

import javax.servlet.*;
import javax.servlet.http.*;

/**
 *
 * @author hyl
 * @version
 */
public class CatalogServlet 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 req, HttpServletResponse res)
    throws ServletException, IOException {
        HttpSession session = req.getSession();
        int itemCount = 0;
        HashMap cart = (HashMap) session.getAttribute("cart");
        if (cart != null) {
            itemCount = cart.size();
        }
        res.setContentType("text/html;charset=gb2312");
        PrintWriter out = res.getWriter();
        out.println("<HTML><HEAD><TITLE>简单购物车 "
                + "Example</TITLE></HEAD>");
        out.println("<BODY><TABLE border=\"0\" width=\"100%\"><tr>");
        out.println("<td align=\"left\" valign=\"bottom\">");
        out.println("<H1>欢迎来到开心水果店购物</H1></td></tr></TABLE><HR>");
        out.print("<FORM ACTION=\"");
        out.println(res.encodeURL("cart"));
        out.println("\" METHOD=\"POST\">");
        out.println("<TABLE CELLSPACING=\"5\" CELLPADDING=\"5\"><TR>");
        out.println("<TD ALIGN=\"center\"><B>种类</B></TD>");
        out.println("<TD ALIGN=\"center\"><B>单价</B></TD>");
        out.println("<TD ALIGN=\"center\"><B>数量</B></TD></TR><TR>");
        out.println("<TD ALIGN=\"center\">"+"苹果"+"</TD>");
        out.println("<TD ALIGN=\"center\">"+"5.5"+"</TD>");
        out.println("<TD ALIGN=\"center\">");
        out.println("<INPUT  NAME=\"apple_amount\""
                + " ></TD></TR><TR>");
        out.println("<TD ALIGN=\"center\">"+"香蕉"+"</TD>");
        out.println("<TD ALIGN=\"center\">"+"4.5"+"</TD>");
        out.println("<TD ALIGN=\"center\">");
        out.println("<INPUT  NAME=\"banana_amount\""
                + "></TD></TR><TR>");
        out.println("<TD ALIGN=\"center\">"+"葡萄"+"</TD>");
        out.println("<TD ALIGN=\"center\">"+"3.6"+"</TD>");
        out.println("<TD ALIGN=\"center\">");
        out.println("<INPUT  NAME=\"grape_amount\""
                + "></TD></TR>");
        out.println("</TABLE><HR>");
        out.println("<INPUT TYPE=\"Submit\" NAME=\"btn_submit\" "
                + "VALUE=\"放入购物车\">");
        out.println("</FORM></BODY></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>
}

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