Struts2+Spring+Freemarker兑现自定义标签

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

1. import?static?freemarker.template.ObjectWrapper.DEFAULT_WRAPPER;????
2. import?java.io.IOException;??import?java.util.HashMap;??
3. import?java.util.Iterator;??import?java.util.List;??
4. import?java.util.Map;??import?java.util.Map.Entry;??
5. ??import?javax.servlet.http.HttpSession;??
6. ??import?org.apache.struts2.ServletActionContext;??
7. ??import?com.newyulong.bcp.product.domain.TypeInfo;??
8. import?com.newyulong.bcp.product.service.ITypeService;??import?com.newyulong.bcp.user.vo.Loginer;??
9. ??import?freemarker.core.Environment;??
10. import?freemarker.template.TemplateDirectiveBody;??import?freemarker.template.TemplateDirectiveModel;??
11. import?freemarker.template.TemplateException;??import?freemarker.template.TemplateModel;??
12. import?freemarker.template.TemplateModelException;??import?freemarker.template.TemplateNumberModel;??
13. ??/**??
14. ??*?@desc:?产品类别自定义标签??
15. ?*/??public?class?ProductTypeTemplateDirectiveModel?implements?TemplateDirectiveModel?{??
16. ????//产品分类服务?????private?ITypeService?typeService;??
17. ????//?展示产品类别数目??????private?static?final?String?PARAM_COUNT?=?"count";??
18. ???
19. ????//?默认??????private?static?final?int?DEAFAULT_COUNT?=?5;??
20. ????????public?void?execute(Environment?environment,?Map?map,??
21. ????????????TemplateModel[]?templateModels,?TemplateDirectiveBody?body)??????????????throws?TemplateException,?IOException?{??
22. ????????int?count?=?0,?hot?=?0;??????????boolean?countParamSet?=?false;??
23. ????????//?获取传递进来的参数??????????Iterator?it?=?map.entrySet().iterator();??
24. ????????while?(it.hasNext())?{??????????????Map.Entry?entry?=?(Entry)?it.next();??
25. ????????????String?paramName?=?entry.getKey().toString();??????????????TemplateModel?paramValue?=?(TemplateModel)?entry.getValue();??
26. ????????????if?(paramName.equals(PARAM_COUNT))?{??????????????????if?(!(paramValue?instanceof?TemplateNumberModel))?{??
27. ????????????????????throw?new?TemplateModelException("The?""?+?PARAM_COUNT??????????????????????????????+?""?parameter?"?+?"must?be?a?number.");??
28. ????????????????}??????????????????count?=?((TemplateNumberModel)?paramValue).getAsNumber()??
29. ????????????????????????.intValue();??????????????????countParamSet?=?true;??
30. ????????????????if?(count?<?0)?{??????????????????????throw?new?TemplateModelException("The?""?+?PARAM_COUNT??
31. ????????????????????????????+?""?parameter?"?+?"can't?be?negative.");??????????????????}??
32. ????????????}?else?{??????????????????throw?new?TemplateModelException("Unsupported?parameter:?"??
33. ????????????????????????+?paramName);??????????????}??
34. ??????????}??
35. ????????//?参数为空时候设置默认值??????????if?(!countParamSet)??
36. ????????????count?=?DEAFAULT_COUNT;???????????????????Map<String,?Object>?maps?=?getTypeList(String.valueOf(count));??
37. ??????????if?(body?!=?null)?{??
38. ??????????????environment.setVariable("typelist",??
39. ????????????????????DEFAULT_WRAPPER.wrap(maps.get("typeList")));??????????????//?真正开始处理输出内容??
40. ????????????body.render(environment.getOut());??????????}?else?{??
41. ????????????throw?new?RuntimeException("missing?body");??????????}??
42. ????}????
43. ????/**???????*???
44. ?????*?@function?产品类别查询列表???????*?@param?count??
45. ?????*?@param?hot???????*?@return??
46. ?????*????????*/??
47. ????public?Map<String,?Object>?getTypeList(String?count)?{??????????Map<String,?Object>?maps?=?new?HashMap<String,?Object>();??
48. ????????//?1.获取产品列表??????????List<TypeInfo>?list?=?typeService.getPreTypeList(count);??
49. ????????maps.put("typeList",?list);??????????return?maps;??
50. ??????}??
51. ????//?获得用户信息?????private?Loginer?getLoginer()?{??
52. ????????HttpSession?session?=?ServletActionContext.getRequest().getSession();??????????return?(Loginer)?session.getAttribute(Loginer.USER_IN_SESSION);??
53. ????}????
54. ????public?void?setTypeService(ITypeService?typeService)?{??????????this.typeService?=?typeService;??
55. ????}??

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>??

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