創建一個添加商品信息的應用程序,通過使用自定義類型的轉換器實現功能

1.目錄結構

2.注解控制器的應用

2.1 web.xml文件 , 導入jar 包(這里不在提醒)

<?xml version="1.0" encoding="UTF-8"?>
<web-app
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns="http://xmlns.jcp.org/xml/ns/javaee"
        xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
        id="WebApp_ID" version="3.1">

    <!--部署DispatcherServlet-->
    <servlet>
        <servlet-name>DispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

2.2 DispatcherServlet-servlet.xml 文件

<?xml version="1.0" encoding="UTF-8"?>
<!--suppress SpringFacetInspection -->
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
		http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
		http://www.springframework.org/schema/mvc
		http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
		http://www.springframework.org/schema/context
		http://www.springframework.org/schema/context/spring-context-3.2.xsd
		http://www.springframework.org/schema/aop
		http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
		http://www.springframework.org/schema/tx
		http://www.springframework.org/schema/tx/spring-tx-3.2.xsd">

    <!--    配置數據類型自定義轉換器-->
    <bean id="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean">
        <property name="converters">
            <list>
                <bean class="com.beyond.dhl.controller.DHLGoodsConverter" />
            </list>
        </property>
    </bean>
    <mvc:annotation-driven conversion-service="conversionService" />


    <!--注解 配置控制器 -->
    <!-- 1. 配置掃描包-->
    <context:component-scan base-package="com.beyond.dhl"/>

    <!-- 2. 使用注解 配置處理映射-->
    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping" />
    <!-- 3. 配置適配器-->
    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"/>
    <!--4.配置  資源視圖解析器   (對本地視圖的路徑解析處理)-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="internalResourceViewResolver">
        <!--設置前綴-->
        <property name="prefix" value="/WEB-INF/jsp/"></property>
        <!--設置后綴-->
        <property name="suffix" value=".jsp"></property>
    </bean>


</beans>

建議將 這個自定義轉換器代碼 放到 掃描器的上面, 我這里之前因為這給報了500,說是找不到 這個自定義轉換器

2.3 Controller 文件

package com.beyond.dhl.controller;


import com.beyond.dhl.domain.DHLGoodsModel;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;


@Controller
@RequestMapping("/my")
public class ZDYGoodsController {

    @RequestMapping("/converter")
//使用@RequestParam("goods")接收請求參數，然后調用自定義類型轉換器GoodsConverter將字符串值轉換為GoodsMode1的對象gm

    public String myConverter (@RequestParam( "goods") DHLGoodsModel gm, Model model){
        System.out.println("商品名稱:"+gm.getGoodsname());
        System.out.println("商品數量:"+gm.getGoodsnumber());
        System.out.println("商品數量:"+gm.getGoodsprice());

        return "showGoods";
    }

}

2.4 自定義轉換器

package com.beyond.dhl.controller;


import com.beyond.dhl.domain.DHLGoodsModel;
import org.springframework.core.convert.converter.Converter;

public class DHLGoodsConverter implements Converter<String, DHLGoodsModel> {

    @Override
    public DHLGoodsModel convert(String source) {

        //創建一個Goods實例
        DHLGoodsModel goods = new DHLGoodsModel();
        //以","進行分割
        String[] strings = source.split(",");
        if (strings != null && strings.length ==3){
            //為goods賦值
            goods.setGoodsname(strings[0]);
            goods.setGoodsprice(Double.parseDouble(strings[1]));
            goods.setGoodsnumber(Integer.parseInt(strings[2]));
            return goods;
        }
        else {
            throw new IllegalArgumentException(String.format("類型轉化失敗,"+"需要格式'apple,10.58,200',您輸入的格式為[%s]",source));
        }

    }
}

2.5 實體類文件

package com.beyond.dhl.domain;




public class DHLGoodsModel {
    private int goodsnumber;
    private String goodsname;
    private double goodsprice;

    public DHLGoodsModel() {
    }

    public DHLGoodsModel(int goodsnumber, String goodsname, double goodsprice) {
        this.goodsnumber = goodsnumber;
        this.goodsname = goodsname;
        this.goodsprice = goodsprice;
    }

    @Override
    public String toString() {
        return "DHLGoodsModel{" +
                "goodsnumber=" + goodsnumber +
                ", goodsname='" + goodsname + '\'' +
                ", goodsprice=" + goodsprice +
                '}';
    }

    public int getGoodsnumber() {
        return goodsnumber;
    }

    public void setGoodsnumber(int goodsnumber) {
        this.goodsnumber = goodsnumber;
    }

    public String getGoodsname() {
        return goodsname;
    }

    public void setGoodsname(String goodsname) {
        this.goodsname = goodsname;
    }

    public double getGoodsprice() {
        return goodsprice;
    }

    public void setGoodsprice(double goodsprice) {
        this.goodsprice = goodsprice;
    }
}

3.編寫首頁 index.jsp頁面 和 showGoods.jsp頁面

index.jsp頁面

<%--
  Created by IntelliJ IDEA.
  User: DHL
  Date: 2020/4/15
  Time: 18:58
  To change this template use File | Settings | File Templates.
--%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  <title>My JSP 'index.jsp' starting page</title>
</head>
<body>
<form action="my/converter" method="post" id="自定義">
  輸入商品信息格式:(格式為: apple,10.58,200) </br>
  <input name="goods"><br>
  <input type="submit" value="提交">

  <br>
  <br>
</form>

</body>
</html>

showGoods.jsp頁面

<%--
  Created by IntelliJ IDEA.
  User: DHL
  Date: 2020/4/28
  Time: 20:31
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>展示</title>
</head>
<body>
您已經成功創建商品信息.
</body>
</html>

4.結果集: