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

    项目结构

    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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    • 原文地址：https://www.cnblogs.com/myitroad/p/6192518.html
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