SpringMVC数据绑定

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

<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_10servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>
        <init-param>
            <param-name>contextConfigLocationparam-name>
            <param-value>classpath:springmvc_servlet.xmlparam-value>
        init-param>
    servlet>
    <servlet-mapping>
        <servlet-name>springmvc_10servlet-name>
        <url-pattern>/url-pattern>
    servlet-mapping>

    
    <filter>
        <filter-name>characterEncodingFilterfilter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilterfilter-class>
        <init-param>
            <param-name>encodingparam-name>
            <param-value>UTF-8param-value>
        init-param>
        <init-param>
            <param-name>forceEncodingparam-name>
            <param-value>trueparam-value>
        init-param>
    filter>
    <filter-mapping>
        <filter-name>characterEncodingFilterfilter-name>
        <url-pattern>/*url-pattern>
    filter-mapping>
web-app>

2.在resources目录下配springmvc_servlet.xml

<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" %>

  
    
  
  
  
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：
            

                
                    请选择
                    
                
            
        
        

            
 
            
 
        
    

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" %>


    


商品展示
继续添加

        

    

        
商品名称
        
商品价格
        
商品类型
    
    

            
${goods.goodsName}
            
${goods.goodsPrice}
            
${goods.goodsType}
        
    

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：