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>