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

<?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：

总结

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