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

项目结构

用户首页

form.html

<html>
<body>

<h1 align='center'>Beer Selection Page</h1>
<form method="post"
      action="SelectBeer.do">
    Select
    <p>

        Color:
        <select name="color" size="1">
            <option value="light"> light</option>
            <option value="amber"> amber</option>
            <option value="brown"> brown</option>
            <option value="dark"> dark</option>
            <option value="red"> red</option>
        </select>
        <br/><br/>
    <center>
        <input type="submit">
    </center>

</form>

</body>
</html>

MVC之C——Servlet

BeerSelect.java

package com.example.web;

import com.example.model.BeerExpert;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;

/**
 * Created by LTN on 2016/10/30.
 */
public class BeerSelect extends HttpServlet {
    public void doGet(HttpServletRequest request,
                       HttpServletResponse response)throws IOException ,ServletException{
        response.setContentType("text/html");
        String c = request.getParameter("color");
        BeerExpert expert = new BeerExpert();
        List result = expert.getBrands(c);
        request.setAttribute("styles", result);
        RequestDispatcher view = request.getRequestDispatcher("result.jsp");
        view.forward(request, response);
    }
    public void doPost(HttpServletRequest request,
                       HttpServletResponse response)throws IOException,ServletException {
        doGet(request,response);
    }

}

MVC之M——模型

BeerExpert.java

package com.example.model;

import java.util.ArrayList;
import java.util.List;

public class BeerExpert
{
    public List getBrands(String color)
    {
        List<String> brands = new ArrayList<String>();
        if ( color.equals("amber") )
        {
            brands.add("Jack Amber");
            brands.add("Red Moose");
        }
        else
        {
            brands.add("Jail Pale Ale");
            brands.add("Gout Stout");
        }
        return (brands);
    }
}

MVC之V——JSP

result.jsp

<%@ page import="java.util.*" %>

<html>
<body>
<h1 align="center">Beer Recommendations JSP</h1>
<p>

<% 
  ArrayList styles = (ArrayList)request.getAttribute("styles");

  Iterator it = styles.iterator();

  while(it.hasNext()) {
    out.print("<br>try " + it.next());
  }
%>

</body>
</html>

配置文件

web.xml

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Archetype Created Web Application</display-name>
  <servlet>
    <servlet-name>Ch3 Beer</servlet-name>
    <servlet-class>com.example.web.BeerSelect</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>Ch3 Beer</servlet-name>
    <url-pattern>/SelectBeer.do</url-pattern>
  </servlet-mapping>
</web-app>

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