《Head First Servlets & JSP》-3-1st servlet MVC demo

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项目结构

技术分享

用户首页

form.html

  1. <html>
  2. <body>
  4. <h1 align=‘center‘>Beer Selection Page</h1>
  5. <form method="post"
  6.       action="SelectBeer.do">
  7.     Select
  8.     <p>
  10.         Color:
  11.         <select name="color" size="1">
  12.             <option value="light"> light</option>
  13.             <option value="amber"> amber</option>
  14.             <option value="brown"> brown</option>
  15.             <option value="dark"> dark</option>
  16.             <option value="red"> red</option>
  17.         </select>
  18.         <br/><br/>
  19.     <center>
  20.         <input type="submit">
  21.     </center>
  23. </form>
  25. </body>
  26. </html>

MVC之C——Servlet

BeerSelect.java

  1. package com.example.web;
  3. import com.example.model.BeerExpert;
  5. import javax.servlet.RequestDispatcher;
  6. import javax.servlet.ServletException;
  7. import javax.servlet.http.HttpServlet;
  8. import javax.servlet.http.HttpServletRequest;
  9. import javax.servlet.http.HttpServletResponse;
  10. import java.io.IOException;
  11. import java.util.List;
  13. /**
  14.  * Created by LTN on 2016/10/30.
  15.  */
  16. public class BeerSelect extends HttpServlet {
  17.     public void doGet(HttpServletRequest request,
  18.                        HttpServletResponse response)throws IOException ,ServletException{
  19.         response.setContentType("text/html");
  20.         String c = request.getParameter("color");
  21.         BeerExpert expert = new BeerExpert();
  22.         List result = expert.getBrands(c);
  23.         request.setAttribute("styles", result);
  24.         RequestDispatcher view = request.getRequestDispatcher("result.jsp");
  25.         view.forward(request, response);
  26.     }
  27.     public void doPost(HttpServletRequest request,
  28.                        HttpServletResponse response)throws IOException,ServletException {
  29.         doGet(request,response);
  30.     }
  32. }

MVC之M——模型

BeerExpert.java

  1. package com.example.model;
  3. import java.util.ArrayList;
  4. import java.util.List;
  6. public class BeerExpert
  7. {
  8.     public List getBrands(String color)
  9.     {
  10.         List<String> brands = new ArrayList<String>();
  11.         if ( color.equals("amber") )
  12.         {
  13.             brands.add("Jack Amber");
  14.             brands.add("Red Moose");
  15.         }
  16.         else
  17.         {
  18.             brands.add("Jail Pale Ale");
  19.             brands.add("Gout Stout");
  20.         }
  21.         return (brands);
  22.     }
  23. }

MVC之V——JSP

result.jsp

  1. <%@ page import="java.util.*" %>
  3. <html>
  4. <body>
  5. <h1 align="center">Beer Recommendations JSP</h1>
  6. <p>
  8. <% 
  9.   ArrayList styles = (ArrayList)request.getAttribute("styles");
  11.   Iterator it = styles.iterator();
  13.   while(it.hasNext()) {
  14.     out.print("<br>try " + it.next());
  15.   }
  16. %>
  18. </body>
  19. </html>

配置文件

web.xml

  1. <!DOCTYPE web-app PUBLIC
  2.  "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
  3.  "http://java.sun.com/dtd/web-app_2_3.dtd" >
  5. <web-app>
  6.   <display-name>Archetype Created Web Application</display-name>
  7.   <servlet>
  8.     <servlet-name>Ch3 Beer</servlet-name>
  9.     <servlet-class>com.example.web.BeerSelect</servlet-class>
  10.   </servlet>
  11.   <servlet-mapping>
  12.     <servlet-name>Ch3 Beer</servlet-name>
  13.     <url-pattern>/SelectBeer.do</url-pattern>
  14.   </servlet-mapping>
  15. </web-app>

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