参考应用ch4创建应用practice44。在应用practice44中创建两个视图页面addGoods.jsp和goodsList.jsp。addGoods.jsp页面的显示效果如图4.5所示，goodsList.jsp页面的显示效果如图4.6所示。
图4.5 添加商品页面
图4.6 商品显示页面
具体要求：
1．商品类型由控制器类GoodsController的方法inputGoods进行初始化。GoodsController类中共有三个方法：inputGoods、addGoods和listGoods。
2．使用Goods模型类封装请求参数。
3．使用Service层，在Service的实现类中，使用静态集合变量模拟数据库存储商品信息，在控制器类中使用@Autowired注解Service。
4．通过地址http://localhost:8080/practice44/goods/input访问addGoods.jsp页面。
5．其他的注意事项参见应用ch4。
1.配置web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0"> <servlet> <servlet-name>springmvc_10</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:springmvc_servlet.xml</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>springmvc_10</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <!-- 避免中文乱码 --> <filter> <filter-name>characterEncodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </init-param> <init-param> <param-name>forceEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>characterEncodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>
2.在resources目录下配springmvc_servlet.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd"> <context:component-scan base-package="com.sxau2.controller"/> <context:component-scan base-package="com.sxau2.servlet"/> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="internalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/"/> <property name="suffix" value=".jsp"/> </bean> </beans>
3.在WEB-INF目录下新建jsp文件夹
4.在java目录下新建com.sxau2包并在子目录下新建Controller、pojo、servlet包
Controller包下新建GoodsController.java
package com.sxau2.controller; import com.sxau2.pojo.Goods; import com.sxau2.servlet.GoodsService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.ModelAttribute; import org.springframework.web.bind.annotation.RequestMapping; import java.util.ArrayList; @Controller @RequestMapping("/goods") public class GoodsController { @Autowired private GoodsService goodsService; @RequestMapping("/add") public String add(Model model){ Goods goods = new Goods(); model.addAttribute("goods",goods); model.addAttribute("goodsTypes",new String[]{"电器","食品","家居","数码"}); return "goodsAdd"; } @RequestMapping("/save") public String save(@ModelAttribute Goods goods,Model model){ if (goodsService.addGoods(goods)){ return "redirect:/goods/list"; }else return "/goods/add"; } @RequestMapping("/list") public String list(Model model){ ArrayList<Goods> goods = goodsService.listGoods(); System.out.println(goods.toString()); model.addAttribute("listgoods",goods); return "goodsList"; } }
pojo包下新建Goods.java实体类
package com.sxau2.pojo; public class Goods { String goodsName; String goodsPrice; String goodsType; public String getGoodsName() { return goodsName; } public void setGoodsName(String goodsName) { this.goodsName = goodsName; } public String getGoodsPrice() { return goodsPrice; } public void setGoodsPrice(String goodsPrice) { this.goodsPrice = goodsPrice; } public String getGoodsType() { return goodsType; } public void setGoodsType(String goodsType) { this.goodsType = goodsType; } @Override public String toString() { return "Goods{" + "goodsName='" + goodsName + '\'' + ", goodsPrice='" + goodsPrice + '\'' + ", goodsType='" + goodsType + '\'' + '}'; } }
service业务层新建GoodsService.java
package com.sxau2.servlet; import com.sxau2.pojo.Goods; import java.util.ArrayList; public interface GoodsService { boolean addGoods(Goods goods); ArrayList<Goods> listGoods(); }
service业务层新建Impl包并在包下新建GoodsServiceImpl.java
package com.sxau2.servlet.impl; import com.sxau2.pojo.Goods; import com.sxau2.servlet.GoodsService; import org.springframework.stereotype.Service; import java.util.ArrayList; @Service public class GoodsServiceImpl implements GoodsService { private static ArrayList<Goods> goodsList = new ArrayList<Goods>(); @Override public boolean addGoods(Goods goods) { goodsList.add(goods); return true; } @Override public ArrayList<Goods> listGoods() { return goodsList; } }
5.编写前端首页index.jsp页面
<%-- Created by IntelliJ IDEA. User: 张晟睿 Date: 2021/6/13 Time: 16:07 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>$Title$</title> </head> <body bgcolor="#ffc0cb"> <p align="center">欢迎来到首页</p> <p align="center"><a href="/goods/add">跳转到商品首页</a></p> </body> </html>
6.在jsp文件夹下新建goodsAdd.jsp、goodsList.jsp
goodsAdd.jsp
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %> <%-- Created by IntelliJ IDEA. User: 张晟睿 Date: 2021/6/13 Time: 16:20 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> <form:form modelAttribute="goods" action="/goods/save" method="post"> <table border="1"> <tr> <td>商品名称：</td> <td><form:input path="goodsName"/></td> </tr> <tr> <td>商品价格：</td> <td><form:input path="goodsPrice"/></td> </tr> <tr> <td>商品类型：</td> <td> <form:select path="goodsType"> <option/>请选择 <form:options items="${goodsTypes}"/> </form:select> </td> </tr> <tr> <td><input type="submit" value="提交"/> </td> <td><input type="reset" value="重置"/> </td> </tr> </table> </form:form> </body> </html>
goodsList.jsp
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <%-- Created by IntelliJ IDEA. User: 张晟睿 Date: 2021/6/13 Time: 16:20 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> <h1>商品展示</h1> <a href="/goods/add">继续添加</a> <table border="1"> <tr> <th>商品名称</th> <th>商品价格</th> <th>商品类型</th> </tr> <c:forEach items="${listgoods}" var="goods"> <tr> <td>${goods.goodsName}</td> <td>${goods.goodsPrice}</td> <td>${goods.goodsType}</td> </tr> </c:forEach> </table> </body> </html>
7.运行注意事项：
地址栏：http://localhost:8080/
增加商品栏地址：http://localhost:8080/goods/add
商品展示地址：http://localhost:8080/goods/list
运行截图：
