[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)

转载：https://www.cnblogs.com/jifeng/p/4117709.html

EECMS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="" />