Struts2+Spring+Freemarker实现自定义标签

 1、实现自定义FreemarkerManager

 

import freemarker.template.Configuration;
import freemarker.template.TemplateDirectiveModel;
import freemarker.template.TemplateException;
import org.apache.struts2.views.freemarker.FreemarkerManager;
import org.springframework.context.ApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;
import javax.servlet.ServletContext;
import java.util.Map;
/**
 * @desc: 增加自定义业务标签，此list中的string必须继承于TemplateDirectiveModel，并且配置在SPRING上下文中
 */
public class CustomFreemarkerManager extends FreemarkerManager {
    protected Configuration createConfiguration(ServletContext servletContext) throws TemplateException {
        Configuration cfg = super.createConfiguration(servletContext);
       ApplicationContext ctx = WebApplicationContextUtils.getRequiredWebApplicationContext(servletContext);
       Map<String,Object> beans=(Map<String,Object>)ctx.getBeansOfType(TemplateDirectiveModel.class);
        for (String key : beans.keySet()) {
            Object bean = beans.get(key);
            if (bean != null && bean instanceof TemplateDirectiveModel)
                cfg.setSharedVariable(key, bean);
        }
        return cfg;
    }
}

 2、在struts.properties中配置你的自定义管理类

struts.freemarker.manager.classname=com.kms.framework.core.view.support.KmsFreemarkerManager

 3、自定义TemplateDirectiveModel

import static freemarker.template.ObjectWrapper.DEFAULT_WRAPPER;

import java.io.IOException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;

import com.newyulong.bcp.product.domain.TypeInfo;
import com.newyulong.bcp.product.service.ITypeService;
import com.newyulong.bcp.user.vo.Loginer;

import freemarker.core.Environment;
import freemarker.template.TemplateDirectiveBody;
import freemarker.template.TemplateDirectiveModel;
import freemarker.template.TemplateException;
import freemarker.template.TemplateModel;
import freemarker.template.TemplateModelException;
import freemarker.template.TemplateNumberModel;

/**
  * @desc: 产品类别自定义标签
 */
public class ProductTypeTemplateDirectiveModel implements TemplateDirectiveModel {
    //产品分类服务
    private ITypeService typeService;
    // 展示产品类别数目
    private static final String PARAM_COUNT = "count";

    // 默认
    private static final int DEAFAULT_COUNT = 5;

    public void execute(Environment environment, Map map,
            TemplateModel[] templateModels, TemplateDirectiveBody body)
            throws TemplateException, IOException {
        int count = 0, hot = 0;
        boolean countParamSet = false;
        // 获取传递进来的参数
        Iterator it = map.entrySet().iterator();
        while (it.hasNext()) {
            Map.Entry entry = (Entry) it.next();
            String paramName = entry.getKey().toString();
            TemplateModel paramValue = (TemplateModel) entry.getValue();
            if (paramName.equals(PARAM_COUNT)) {
                if (!(paramValue instanceof TemplateNumberModel)) {
                    throw new TemplateModelException("The \"" + PARAM_COUNT
                            + "\" parameter " + "must be a number.");
                }
                count = ((TemplateNumberModel) paramValue).getAsNumber()
                        .intValue();
                countParamSet = true;
                if (count < 0) {
                    throw new TemplateModelException("The \"" + PARAM_COUNT
                            + "\" parameter " + "can't be negative.");
                }
            } else {
                throw new TemplateModelException("Unsupported parameter: "
                        + paramName);
            }

        }
        // 参数为空时候设置默认值
        if (!countParamSet)
            count = DEAFAULT_COUNT;

        Map<String, Object> maps = getTypeList(String.valueOf(count));

        if (body != null) {

            environment.setVariable("typelist",
                    DEFAULT_WRAPPER.wrap(maps.get("typeList")));
            // 真正开始处理输出内容
            body.render(environment.getOut());
        } else {
            throw new RuntimeException("missing body");
        }
    }

    /**
     *
     * @function 产品类别查询列表
     * @param count
     * @param hot
     * @return
     *
     */
    public Map<String, Object> getTypeList(String count) {
        Map<String, Object> maps = new HashMap<String, Object>();
        // 1.获取产品列表
        List<TypeInfo> list = typeService.getPreTypeList(count);
        maps.put("typeList", list);
        return maps;

    }
    // 获得用户信息
    private Loginer getLoginer() {
        HttpSession session = ServletActionContext.getRequest().getSession();
        return (Loginer) session.getAttribute(Loginer.USER_IN_SESSION);
    }

    public void setTypeService(ITypeService typeService) {
        this.typeService = typeService;
    }

4、在spring上下文中配置

<!--产品类别标签-->
<bean id="ptype" class="com.newyulong.bcp.web.tag.ProductTypeTemplateDirectiveModel"></bean>

 5、在页面中使用你的标签吧

<div class="gen">
<h2 class="gen_tit">产品分类</h2>
    <ul>
      <!--产品分类-->
      <@ptype>
                 <#list list as entity>
                     <li class="bto">?
                         <a href="${ctx}/web/productt.do?type=${entity.id}">
                             <#if entity.title?length gt 12 >
                                 ${entity.title[0..11]}...
                              <#else>
                                 ${entity.title}
                             </#if>
                         </a>
                     </li>
                 </#list>
         </@ptype>
    </ul>
</div>

 

评论

1 楼 dl374868471 2012-04-23  

最近在做个需要生成静态页的 项目 大虾方便的话 能否帮小弟指教一下QQ：374868471 多谢