标签：etc void action lin pre web app extends amp code
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>
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);}}
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);}}
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>
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>
《Head First Servlets & JSP》-3-1st servlet MVC demo
标签：etc void action lin pre web app extends amp code
原文地址：http://www.cnblogs.com/myitroad/p/6192518.html
