一、思想
-
创建一个taotao-item-web工程,展示商品的详情。
-
点击商品的图片，打开商品详情页面
- 商品基本信息
- 延迟加载商品详情。延迟一秒加载使用ajax
- 商品的规格参数。按需加载，当用户点击商品规格参数tab页，加载ajax。
二、商品详情的实现
需求分析:
在查询出的商品列表页面中,点击查看某一个商品,根据商品的sku查询出该商品的详细信息,
添加缓存.
三、商品详情页面展示
1. 需求分析
需要在taotao-search-web中调用taotao-item-web工程的Controller，查询商品详情。
- 商品的基本信息
- 商品的描述
- 商品的规格
当用户请求商品详情页面时，只需要把商品基本信息展示出来，为了快速响应用户。商品的描述可以延迟加载，延迟一秒钟加载。商品的规格参数按需加载，当用户点击商品规格参数的标签页此时加载。
2. 代码的编写（查询商品）
2.1 dao层
2.2 service层
2.3 ServiceImpl
3. 创建taotao-item-web工程
4. 配置文件
将taotao-portal里面的复制过来，修改
4.1 创建web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>taotao-item-web</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring/applicationContext-*.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<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>
</filter>
<filter-mapping>
<filter-name>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<servlet>
<servlet-name>taotao-item-web</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring/springmvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>taotao-item-web</servlet-name>
<url-pattern>*.html</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>taotao-item-web</servlet-name>
<url-pattern>*.action</url-pattern>
</servlet-mapping>
</web-app>4.2 修改springmvc.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:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd">
<!-- 配置注解驱动 -->
<mvc:annotation-driven />
<!-- 视图解析器 -->
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" />
</bean>
<!-- 配置包扫描器，扫描@Controller注解的类 -->
<context:component-scan base-package="com.taotao.item.controller"/>
<!-- 配置静态资源 -->
<mvc:resources location="/WEB-INF/css/" mapping="/css/**"/>
<mvc:resources location="/WEB-INF/js/" mapping="/js/**"/>
<!-- 引用dubbo服务 -->
<dubbo:application name="taotao-item"/>
<dubbo:registry protocol="zookeeper" address="172.18.34.94:2181"/>
<!-- 发布dubbo服务 -->
<dubbo:reference interface="com.taotao.service.ItemService" id="itemService"" timeout = "300000" />
</beans> 
4.3 pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.taotao</groupId>
<artifactId>taotao-parent</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<groupId>com.taotao</groupId>
<artifactId>taotao-item-web</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<dependencies>
<dependency>
<groupId>com.taotao</groupId>
<artifactId>taotao-common</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>com.taotao</groupId>
<artifactId>taotao-manager-interface</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>com.taotao</groupId>
<artifactId>taotao-manager-pojo</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
<!-- Spring -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jms</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
</dependency>
<!-- JSP相关 -->
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jsp-api</artifactId>
<scope>provided</scope>
</dependency>
<!-- dubbo相关 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>dubbo</artifactId>
<exclusions>
<exclusion>
<artifactId>spring</artifactId>
<groupId>org.springframework</groupId>
</exclusion>
<exclusion>
<artifactId>netty</artifactId>
<groupId>org.jboss.netty</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
</dependency>
<dependency>
<groupId>com.github.sgroschupf</groupId>
<artifactId>zkclient</artifactId>
</dependency>
<!-- httpclient -->
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
</dependency>
<!-- 单元测试 -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<!-- 配置插件 -->
<plugins>
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<configuration>
<port>8086</port>
<path>/</path>
</configuration>
</plugin>
</plugins>
</build>
</project>4.4 Controller
4.5 测试：发现如下图错误
原因：这是因为item.jsp页面上显示的是images[0],而我们实体类TbItem.java中的是image
4.6 bug修复
直接取image这个标签截取字符串,修改pojo类,只要是image这个,返回一个数组,
第一种方案:解决方案:修改 taotao-manager-pojo类的的TbItem这个pojo类.把里面的image,返回改为数组类型.问题:别的项目也用到这个TbItem这个类,你给改了,你的项目好使了,别人的项目就不好使.
第二种方案: 自己写个pojo类, 继承TbItem,把里面的getImage这个属性改一下,在我的jsp页面中就可以用了.
4.7 创建ItemPojo.java类继承TbItem.java
package com.taotao.item.pojo;
import com.taotao.pojo.TbItem;
public class ItemPojo extends TbItem{
//把返回的数据放入到当前方法的成员变量中
public ItemPojo(TbItem tbItem){
this.setId(tbItem.getId());
this.setImage(tbItem.getImage());
this.setCid(tbItem.getCid());
this.setCreated(tbItem.getCreated());
this.setBarcode(tbItem.getBarcode());
this.setNum(tbItem.getNum());
this.setPrice(tbItem.getPrice());
this.setSellPoint(tbItem.getSellPoint());
this.setStatus(tbItem.getStatus());
this.setTitle(tbItem.getTitle());
this.setUpdated(tbItem.getUpdated());
}
//这个get方法为了迎合页面上的images
public String[] getImages(){
String image = getImage();
if (image !=null) {
String[] imagesArr = image.split(",");
return imagesArr;
}
return null;
}
}
4.8 修改Controller
package com.taotao.item.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import com.taotao.item.pojo.ItemPojo;
import com.taotao.pojo.TbItem;
import com.taotao.service.ItemService;
@Controller
public class ItemController {
@Autowired
private ItemService itemService;
/**
* 此处的参数来源是taotao-search-web下面的search.jsp页面
* @param model
* @param itemId
* @return
*/
@RequestMapping("/item/{itemId}")
public String getItem(Model model, @PathVariable long itemId){
TbItem item = itemService.getItemById(itemId);
ItemPojo itemPojo = new ItemPojo(item);
model.addAttribute("item", itemPojo);
return "item";
}
}
4.9 页面测试
