[原创]JEECMS 自定义标签调用广告版位下的所有广告(利用广告管理管理首页幻灯片)

JEECMS自带的只有[@cms_advertising]标签，并且官方没有给文档，用法:

[@cms_advertising id='3'] 
            <img src="${(tag_bean.attr.image_url)!?html}" width="${(tag_bean.attr.image_width)!?html}" height="${(tag_bean.attr.image_height)!?html}" /> 
 [/@cms_advertising]

这个是根据广告ID的来调用单独的一条广告，首页幻灯片一般都有多张，不能满足需求。

其实jeecms也有另一个js调用已经实现了的，但是不能生成到html中，用户体验不好。（com.jeecms.cms.action.front.AdvertisingAct类，<script src="/ad.jspx"  ……）

回到正题，自己增加一个标签，名字叫做：cms_advertising_space

步骤一：

jeecms-context.xml中增加一个bean：

	<!-- 新增按照广告牌取所有广告标签 -->

	<bean id="cms_advertising_space" class="com.jeecms.cms.action.directive.CmsAdvertisingSpaceDirective"/>

步骤二：

jeecms.properties添加cms_advertising_space标签

directive.cms_advertising_space=cms_advertising_space

　　

步骤三：

新增一个类：CmsAdvertisingSpaceDirective

package com.jeecms.cms.action.directive;

import static com.jeecms.common.web.freemarker.DirectiveUtils.OUT_BEAN;

import static freemarker.template.ObjectWrapper.DEFAULT_WRAPPER;

import java.io.IOException;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import org.springframework.beans.factory.annotation.Autowired;

import static com.jeecms.common.web.freemarker.DirectiveUtils.OUT_LIST;

import com.jeecms.cms.entity.assist.CmsAdvertising;

import com.jeecms.cms.entity.assist.CmsAdvertisingSpace;

import com.jeecms.cms.manager.assist.CmsAdvertisingMng;

import com.jeecms.cms.manager.assist.CmsAdvertisingSpaceMng;

import com.jeecms.common.web.freemarker.DirectiveUtils;

import freemarker.core.Environment;

import freemarker.template.TemplateDirectiveBody;

import freemarker.template.TemplateDirectiveModel;

import freemarker.template.TemplateException;

import freemarker.template.TemplateModel;

/**

 * 广告对象标签

 */

public class CmsAdvertisingSpaceDirective implements TemplateDirectiveModel {

    /**

     * 输入参数，广告ID。

     */

    public static final String PARAM_ID = "id";

    @SuppressWarnings("unchecked")

    public void execute(Environment env, Map params, TemplateModel[] loopVars,

            TemplateDirectiveBody body) throws TemplateException, IOException {

        Integer id = DirectiveUtils.getInt(PARAM_ID, params);

        List<CmsAdvertising> ads = null;

        CmsAdvertisingSpace adspace;

        if (id != null) {

            //ad = cmsAdvertisingMng.findById(id);

            ads= cmsAdvertisingMng.getList(id, true);

        }

        Map<String, TemplateModel> paramWrap = new HashMap<String, TemplateModel>(

                params);

        if (ads!=null){

            paramWrap.put(OUT_LIST, DEFAULT_WRAPPER.wrap(ads));

        }

        Map<String, TemplateModel> origMap = DirectiveUtils

                .addParamsToVariable(env, paramWrap);

        body.render(env.getOut());

        DirectiveUtils.removeParamsFromVariable(env, paramWrap, origMap);

    }

    @Autowired

    private CmsAdvertisingMng cmsAdvertisingMng;

    @Autowired

    private CmsAdvertisingSpaceMng cmsAdvertisingSpaceMng;

}

标签写法：

[@cms_advertising_space id='7']

[#list tag_list as c]

<img src="${(c.attr.image_url)!?html}" width="${(c.attr.image_width)!?html}" height="${(c.attr.image_height)!?html}" />

[/#list]

 [/@cms_advertising_space]

　　生成代码：

<img src="http://127.0.0.1:8080/r/cms/kingyon_zh/uploads/7-140611092P2415.jpg" width="" height="" />

<img src="http://127.0.0.1:8080/r/cms/kingyon_zh/uploads/3-140611092P2415.jpg" width="" height="" />