Struts2+Spring+Freemarker兑现自定义标签

?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. ??
3. import?java.io.IOException;??
4. import?java.util.HashMap;??
5. import?java.util.Iterator;??
6. import?java.util.List;??
7. import?java.util.Map;??
8. import?java.util.Map.Entry;??
9. ??
10. import?javax.servlet.http.HttpSession;??
11. ??
12. import?org.apache.struts2.ServletActionContext;??
13. ??
14. import?com.newyulong.bcp.product.domain.TypeInfo;??
15. import?com.newyulong.bcp.product.service.ITypeService;??
16. import?com.newyulong.bcp.user.vo.Loginer;??
17. ??
18. import?freemarker.core.Environment;??
19. import?freemarker.template.TemplateDirectiveBody;??
20. import?freemarker.template.TemplateDirectiveModel;??
21. import?freemarker.template.TemplateException;??
22. import?freemarker.template.TemplateModel;??
23. import?freemarker.template.TemplateModelException;??
24. import?freemarker.template.TemplateNumberModel;??
25. ??
26. /**??
27. ??*?@desc:?产品类别自定义标签??
28. ?*/??
29. public?class?ProductTypeTemplateDirectiveModel?implements?TemplateDirectiveModel?{??
30. ????//产品分类服务?
31. ????private?ITypeService?typeService;??
32. ????//?展示产品类别数目??
33. ????private?static?final?String?PARAM_COUNT?=?"count";??
34. ???
35. ????//?默认??
36. ????private?static?final?int?DEAFAULT_COUNT?=?5;??
37. ????
38. ????public?void?execute(Environment?environment,?Map?map,??
39. ????????????TemplateModel[]?templateModels,?TemplateDirectiveBody?body)??
40. ????????????throws?TemplateException,?IOException?{??
41. ????????int?count?=?0,?hot?=?0;??
42. ????????boolean?countParamSet?=?false;??
43. ????????//?获取传递进来的参数??
44. ????????Iterator?it?=?map.entrySet().iterator();??
45. ????????while?(it.hasNext())?{??
46. ????????????Map.Entry?entry?=?(Entry)?it.next();??
47. ????????????String?paramName?=?entry.getKey().toString();??
48. ????????????TemplateModel?paramValue?=?(TemplateModel)?entry.getValue();??
49. ????????????if?(paramName.equals(PARAM_COUNT))?{??
50. ????????????????if?(!(paramValue?instanceof?TemplateNumberModel))?{??
51. ????????????????????throw?new?TemplateModelException("The?\""?+?PARAM_COUNT??
52. ????????????????????????????+?"\"?parameter?"?+?"must?be?a?number.");??
53. ????????????????}??
54. ????????????????count?=?((TemplateNumberModel)?paramValue).getAsNumber()??
55. ????????????????????????.intValue();??
56. ????????????????countParamSet?=?true;??
57. ????????????????if?(count?<?0)?{??
58. ????????????????????throw?new?TemplateModelException("The?\""?+?PARAM_COUNT??
59. ????????????????????????????+?"\"?parameter?"?+?"can't?be?negative.");??
60. ????????????????}??
61. ????????????}?else?{??
62. ????????????????throw?new?TemplateModelException("Unsupported?parameter:?"??
63. ????????????????????????+?paramName);??
64. ????????????}??
65. ??
66. ????????}??
67. ????????//?参数为空时候设置默认值??
68. ????????if?(!countParamSet)??
69. ????????????count?=?DEAFAULT_COUNT;??
70. ?????????
71. ????????Map<String,?Object>?maps?=?getTypeList(String.valueOf(count));??
72. ??
73. ????????if?(body?!=?null)?{??
74. ??
75. ????????????environment.setVariable("typelist",??
76. ????????????????????DEFAULT_WRAPPER.wrap(maps.get("typeList")));??
77. ????????????//?真正开始处理输出内容??
78. ????????????body.render(environment.getOut());??
79. ????????}?else?{??
80. ????????????throw?new?RuntimeException("missing?body");??
81. ????????}??
82. ????}??
83. ??
84. ????/**??
85. ?????*???
86. ?????*?@function?产品类别查询列表??
87. ?????*?@param?count??
88. ?????*?@param?hot??
89. ?????*?@return??
90. ?????*???
91. ?????*/??
92. ????public?Map<String,?Object>?getTypeList(String?count)?{??
93. ????????Map<String,?Object>?maps?=?new?HashMap<String,?Object>();??
94. ????????//?1.获取产品列表??
95. ????????List<TypeInfo>?list?=?typeService.getPreTypeList(count);??
96. ????????maps.put("typeList",?list);??
97. ????????return?maps;??
98. ??
99. ????}??
100. ????//?获得用户信息?
101. ????private?Loginer?getLoginer()?{??
102. ????????HttpSession?session?=?ServletActionContext.getRequest().getSession();??
103. ????????return?(Loginer)?session.getAttribute(Loginer.USER_IN_SESSION);??
104. ????}??
105. ??
106. ????public?void?setTypeService(ITypeService?typeService)?{??
107. ????????this.typeService?=?typeService;??
108. ????}??

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>??

?