一篇文章带你了解SpringMVC数据绑定

2021-11-02 13:10zsr6135 Java教程

这篇文章主要给大家介绍了关于如何通过一篇文章弄懂Spring MVC的参数绑定，文中通过示例代码以及图文介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值，需要的朋友们下面来一起学习学习吧

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。

一篇文章带你了解SpringMVC数据绑定

图4.5 添加商品页面

一篇文章带你了解SpringMVC数据绑定

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

    springmvc_10org.springframework.web.servlet.DispatcherServlet contextConfigLocationclasspath:springmvc_servlet.xml springmvc_10/ characterEncodingFilterorg.springframework.web.filter.CharacterEncodingFilter encodingUTF-8 forceEncodingtrue characterEncodingFilter/*

2.在resources目录下配springmvc_servlet.xml

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 = 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 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 goodsList = new ArrayList(); @Override public boolean addGoods(Goods goods) { goodsList.add(goods); return true; } @Override public ArrayList 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" %>

欢迎来到首页

跳转到商品首页

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" %>

商品名称：
商品价格：
商品类型：

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" %>