e3mall项目：前台商品详情展示（动态生成）

其他 2018-07-07 17:42:00 阅读次数: 0

e3mall项目：前台商品详情展示

准备工作：新建子工程 e3-item-web，并将静态资源导入，包结构如下：


一、，相关配置文件以及代码（e3-item-web）

（1）pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<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">
    <parent>
        <artifactId>e3-parent</artifactId>
        <groupId>cn.e3mall</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>e3-item-web</artifactId>
    <packaging>war</packaging>

    <name>e3-item-web</name>
    <dependencies>
        <dependency>
            <groupId>cn.e3mall</groupId>
            <artifactId>e3-manager-interface</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>cn.e3mall</groupId>
            <artifactId>e3-manager-dao</artifactId>
            <version>1.0-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>
    </dependencies>

    <build>
        <plugins>
            <!-- 配置Tomcat插件 -->
            <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <version>2.2</version>
                <configuration>
                    <port>8086</port>
                    <path>/</path>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

（2）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:dubbo="http://code.alibabatech.com/schema/dubbo"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       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">

    <!--读取resource配置文件-->
    <context:property-placeholder location="classpath:other/*.properties"/>

    <!--开启注解支持-->
    <context:component-scan base-package="cn.e3mall.item.controller" />

    <!--配置SpringMVC注解支持-->
    <mvc:annotation-driven />

    <!--配置SpringMVC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>

    <!-- 引用dubbo服务 -->
    <dubbo:application name="e3-search-web"/>
    <dubbo:registry protocol="zookeeper" address="192.168.25.130:2181"/>
    <dubbo:reference interface="cn.e3mall.service.ItemService" id="itemService" />



</beans>

（3）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"
         version="2.5">
  <display-name>e3-item-web</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
  </welcome-file-list>

  <!--配置SpringMVC前段控制器-->
  <servlet>
    <servlet-name>e3-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>e3-item-web</servlet-name>
    <!--伪静态化-->
    <url-pattern>*.html</url-pattern>
  </servlet-mapping>

  <!--POST提交乱码解决-->
  <filter>
    <filter-name>encoding</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>encoding</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>

（4）ItemInfoController

package cn.e3mall.item.controller;

import cn.e3mall.common.entity.E3Result;
import cn.e3mall.entity.TbItem;
import cn.e3mall.entity.TbItemDesc;
import cn.e3mall.item.entity.Item;
import cn.e3mall.service.ItemService;
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;

/**
 * 商品详情展示 web层
 * Author: xushuai
 * Date: 2018/5/27
 * Time: 13:16
 * Description:
 */
@Controller
public class ItemInfoController {

    @Autowired
    private ItemService itemService;

    @RequestMapping("/item/{itemId}")
    public String loadItemInfo(@PathVariable Long itemId, Model model){
        //调用服务查询商品信息
        E3Result e3Result1 = itemService.load(itemId);
        TbItem item = (TbItem) e3Result1.getData();
        //查询商品描述
        E3Result e3Result2 = itemService.findDescByItemid(itemId);
        TbItemDesc desc = (TbItemDesc) e3Result2.getData();

        //保存数据到页面
        model.addAttribute("item",new Item(item));
        model.addAttribute("itemDesc",desc);

        return "item";
    }
}

（5）还需要封装一个 实体类，继承自TbItem（页面需要）

package cn.e3mall.item.entity;


import cn.e3mall.entity.TbItem;


public class Item extends TbItem {
	
	public Item(TbItem tbItem) {
		this.setId(tbItem.getId());
		this.setTitle(tbItem.getTitle());
		this.setSellPoint(tbItem.getSellPoint());
		this.setPrice(tbItem.getPrice());
		this.setNum(tbItem.getNum());
		this.setBarcode(tbItem.getBarcode());
		this.setImage(tbItem.getImage());
		this.setCid(tbItem.getCid());
		this.setStatus(tbItem.getStatus());
		this.setCreated(tbItem.getCreated());
		this.setUpdated(tbItem.getUpdated());
	}

	public String[] getImages() {
		String image2 = this.getImage();
		if (image2 != null && !"".equals(image2)) {
			String[] strings = image2.split(",");
			return strings;
		}
		return null;
	}
}

二、在服务提供端，应用缓存（e3-manager-service工程的ItemServiceImpl）

（1）添加redis依赖（e3-manager-service的pom文件中新增）

        <!--redis客户端-->
        <dependency>
            <groupId>redis.clients</groupId>
            <artifactId>jedis</artifactId>
        </dependency>

（2）相关代码。（其中包括，查询缓存、添加缓存以及同步缓存）

针对三个功能，我封装成了三个方法

    /**
     * 将数据添加到缓存中
     * @auther: xushuai
     * @date: 2018/5/27 14:28
     */
    private void saveCache(String key,Object data) {
        try {
            //将查询到数据添加到缓存
            jedisClient.set(key, JsonUtils.objectToJson(data));
            //设置缓存过期时间
            jedisClient.expire(key,timeout);
        }catch (Exception e){
            e.printStackTrace();
        }
    }

    /**
     * 查询缓存
     * 如果查询到，返回查询到的结果
     * @auther: xushuai
     * @date: 2018/5/27 14:20
     */
    private E3Result searchCache(String key, Class clazz){
        try {
            //根据key值查询
            String s = jedisClient.get(key);
            //校验查询结果是否不为空
            if(StringUtils.isNotBlank(s)){
                return E3Result.ok(JsonUtils.jsonToPojo(s,clazz));
            }
        }catch (Exception e){
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 同步缓存（删除对应key的缓存即可）
     * @auther: xushuai
     * @date: 2018/5/27 14:54
     */
    private void syncCache(Long itemId) {
        try {
            //生成对应的key
            String key = prefix + ":" + itemId + ":";
            //BASE_KEY
            String baseKey = key + "BASE";
            //DESC_KEY
            String descKey = key + "DESC";

            //删除这两个key值对应的缓存,即设置过期时间为0
            jedisClient.expire(baseKey,0);
            jedisClient.expire(descKey,0);
        }catch (Exception e){
            e.printStackTrace();
        }
    }

在需要的地方记性调用：




注意：在项目中注入相关类和数据，如下：



（3）resource.properties新增配置

## redis单机版连接信息
redis.host=192.168.25.130
redis.port=6379

## redis中的key前缀
redis.prefix=ITEM_INFO

## redis 商品缓存过期时间 (单位：秒)
redis.time=3600

（4）新建配置文件：applicationContext-redis.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
       xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
	http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd
	http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd
	http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.2.xsd">


    <!--配置单机版redis-->
    <bean id="jedisPool" class="redis.clients.jedis.JedisPool">
        <constructor-arg name="host" value="${redis.host}"/>
        <constructor-arg name="port" value="${redis.port}"/>
    </bean>
    <bean id="jedisClientPool" class="cn.e3mall.common.redis.JedisClientPool">
        <property name="jedisPool" ref="jedisPool" />
    </bean>

    <!--配置集群版redis-->
<!--
    <bean id="jedisCluster" class="redis.clients.jedis.JedisCluster">
        <constructor-arg name="nodes">
            <set>
                <bean class="redis.clients.jedis.HostAndPort">
                    <constructor-arg name="host" value="${redis.host1}"/>
                    <constructor-arg name="port" value="${redis.port1}"/>
                </bean>
                <bean class="redis.clients.jedis.HostAndPort">
                    <constructor-arg name="host" value="${redis.host2}"/>
                    <constructor-arg name="port" value="${redis.port2}"/>
                </bean>
                <bean class="redis.clients.jedis.HostAndPort">
                    <constructor-arg name="host" value="${redis.host3}"/>
                    <constructor-arg name="port" value="${redis.port3}"/>
                </bean>
            </set>
        </constructor-arg>
    </bean>
    <bean id="jedisClientCluster" class="cn.e3mall.common.redis.JedisClientCluster">
        <property name="jedisCluster" ref="jedisCluster"/>
    </bean>
-->

</beans>


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