一篇文章带你了解SpringMVC数据绑定

目录

• 1.配置web.xml
• 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
• pojo包下新建Goods.java实体类
• service业务层新建GoodsService.java
• service业务层新建Impl包并在包下新建GoodsServiceImpl.java
• 5.编写前端首页index.jsp页面
• 6.在jsp文件夹下新建goodsAdd.jsp、goodsList.jsp goodsAdd.jsp
• goodsList.jsp
• 7.运行注意事项：
• 总结

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

    
        springmvc_10
        org.springframework.web.servlet.DispatcherServlet
        
            contextConfigLocation
            classpath:springmvc_servlet.xml
        
    
    
        springmvc_10
        /
    
    
    
        characterEncodingFilter
        org.springframework.web.filter.CharacterEncodingFilter
        
            encoding
            UTF-8
        
        
            forceEncoding
            true
        
    
    
        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：
            

                
                    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：

总结

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