freemarker 自定义标签

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踩 最近项目中要将前台的好多首页静态化，当然首选freemarker，可前台首页算下来有好十几个，这样一个一个在页面用freemarker标签不累死人。在网上找了好多资料，发现freemarker可以像jsp那样自定义标签。嘿嘿 这样就简单了将要显示的内容给他输出出来，页面控制他的样式，这不就省了不少事 

标签： FreeMarker 自定义标签 代码片段(4)
[代码] 实现自己的自定义 freemarker标签
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01 package com.f139.frame.freemarker.directive; 

02   

03 import java.io.IOException; 

04 import java.io.Writer; 

05 import java.util.Map; 

06   

07 import org.nutz.dao.Dao; 

08   

09 import com.f139.frame.pojo.factory.Label; 

10   

11 import freemarker.core.Environment; 

12 import freemarker.template.TemplateDirectiveBody; 

13 import freemarker.template.TemplateDirectiveModel; 

14 import freemarker.template.TemplateException; 

15 import freemarker.template.TemplateModel; 

16   

17 public class LabelDirective implements TemplateDirectiveModel { 

18   

19     private Dao dao; 

20   

21     public LabelDirective(Dao dao) { 

22         this.dao = dao; 

23     } 

24   

25     @Override

26     @SuppressWarnings("unchecked") 

27     public void execute(Environment env, Map params, TemplateModel[] loopVars, TemplateDirectiveBody body) throws TemplateException, IOException { 

28           

29         for (TemplateModel templateModel : loopVars) { 

30             templateModel.toString(); 

31         } 

32           

33         // 真正开始处理输出内容 

34         Writer out = env.getOut(); 

35   

36         if (body != null) { 

37             out.write(getContent(params)); 

38             body.render(out); 

39         } 

40     } 

41   

42     private String getContent(Map<?,?> params) { 

43         Integer id = Integer.parseInt(params.get("id").toString()); 

44         if (null != id) { 

45             Label label = this.dao.fetch(Label.class, id); 

46             return label.getLabelContent(); 

47         } 

48         return null; 

49     } 

50 }
[代码] 将自定义freemarker 标签添加到ExtendServlet
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01 package com.f139.frame.servlet; 

02   

03 import org.nutz.dao.Dao; 

04 import org.nutz.dao.impl.NutDao; 

05 import org.nutz.ioc.Ioc; 

06 import org.nutz.ioc.impl.NutIoc; 

07 import org.nutz.ioc.loader.json.JsonLoader; 

08   

09 import com.f139.frame.tag.RepeatDirective; 

10   

11 import freemarker.ext.jsp.TaglibFactory; 

12 import freemarker.ext.servlet.FreemarkerServlet; 

13 import freemarker.template.Configuration; 

14 import freemarker.template.TemplateModel; 

15 import freemarker.template.TemplateModelException; 

16   

17   

18 public class ExtendServlet extends FreemarkerServlet { 

19   

20     /** 

21      *  

22      */

23     private static final long serialVersionUID = 1L; 

24   

25     private Dao dao; 

26   

27     public ExtendServlet() { 

28         Ioc ioc = new NutIoc(new JsonLoader("com/f139/frame/ioc")); 

29         this.dao = ioc.get(NutDao.class, "dao"); 

30     } 

31   

32     @Override

33     protected Configuration createConfiguration() { 

34         //添加自定义标签 

35         Configuration cfg = super.createConfiguration(); 

36         cfg.setSharedVariable("label", new LabelDirective(dao)); 

37         return cfg; 

38     } 

39   

40 } 

41   

42 ExtendServlet继承FreemarkerServlet
[代码] 在web.xml添加相应配置
view sourceprint?01 <servlet> 

02         <servlet-name>freemarker</servlet-name> 

03         <servlet-class>com.f139.frame.servlet.ExtendServlet</servlet-class> 

04         <init-param> 

05             <param-name>TemplatePath</param-name> 

06             <param-value>/</param-value> 

07         </init-param> 

08         <init-param> 

09             <param-name>NoCache</param-name> 

10             <param-value>true</param-value> 

11         </init-param> 

12         <init-param> 

13             <param-name>ContentType</param-name> 

14             <param-value>text/html;charset=UTF-8</param-value> 

15         </init-param> 

16         <init-param> 

17             <param-name>template_update_delay</param-name> 

18             <param-value>0</param-value> 

19         </init-param> 

20         <init-param> 

21             <param-name>default_encoding</param-name> 

22             <param-value>UTF-8</param-value> 

23         </init-param> 

24         <init-param> 

25             <param-name>number_format</param-name> 

26             <param-value>0.##########</param-value> 

27         </init-param> 

28         <load-on-startup>1</load-on-startup> 

29     </servlet>
[代码] 使用自己的标签
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1 <@label id=21> 

2   

3 </@label>