1. [代码]实现自己的自定义 freemarker标签 跳至 [1] [2] [3] [4] [全屏预览]
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package
com.f139.frame.freemarker.directive;
import
java.io.IOException;
import
java.io.Writer;
import
java.util.Map;
import
org.nutz.dao.Dao;
import
com.f139.frame.pojo.factory.Label;
import
freemarker.core.Environment;
import
freemarker.template.TemplateDirectiveBody;
import
freemarker.template.TemplateDirectiveModel;
import
freemarker.template.TemplateException;
import
freemarker.template.TemplateModel;
public
class
LabelDirective
implements
TemplateDirectiveModel {
private
Dao dao;
public
LabelDirective(Dao dao) {
this
.dao = dao;
}
@Override
@SuppressWarnings
(
"unchecked"
)
public
void
execute(Environment env, Map params, TemplateModel[] loopVars, TemplateDirectiveBody body)
throws
TemplateException, IOException {
for
(TemplateModel templateModel : loopVars) {
templateModel.toString();
}
// 真正开始处理输出内容
Writer out = env.getOut();
if
(body !=
null
) {
out.write(getContent(params));
body.render(out);
}
}
private
String getContent(Map<?,?> params) {
Integer id = Integer.parseInt(params.get(
"id"
).toString());
if
(
null
!= id) {
Label label =
this
.dao.fetch(Label.
class
, id);
return
label.getLabelContent();
}
return
null
;
}
}
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2. [代码]将自定义freemarker 标签添加到ExtendServlet
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package
com.f139.frame.servlet;
import
org.nutz.dao.Dao;
import
org.nutz.dao.impl.NutDao;
import
org.nutz.ioc.Ioc;
import
org.nutz.ioc.impl.NutIoc;
import
org.nutz.ioc.loader.json.JsonLoader;
import
com.f139.frame.tag.RepeatDirective;
import
freemarker.ext.jsp.TaglibFactory;
import
freemarker.ext.servlet.FreemarkerServlet;
import
freemarker.template.Configuration;
import
freemarker.template.TemplateModel;
import
freemarker.template.TemplateModelException;
public
class
ExtendServlet
extends
FreemarkerServlet {
/**
*
*/
private
static
final
long
serialVersionUID = 1L;
private
Dao dao;
public
ExtendServlet() {
Ioc ioc =
new
NutIoc(
new
JsonLoader(
"com/f139/frame/ioc"
));
this
.dao = ioc.get(NutDao.
class
,
"dao"
);
}
@Override
protected
Configuration createConfiguration() {
//添加自定义标签
Configuration cfg =
super
.createConfiguration();
cfg.setSharedVariable(
"label"
,
new
LabelDirective(dao));
return
cfg;
}
}
ExtendServlet继承FreemarkerServlet
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3. [代码]在web.xml添加相应配置
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<servlet>
<servlet-name>freemarker</servlet-name>
<servlet-
class
>com.f139.frame.servlet.ExtendServlet</servlet-
class
>
<init-param>
<param-name>TemplatePath</param-name>
<param-value>/</param-value>
</init-param>
<init-param>
<param-name>NoCache</param-name>
<param-value>
true
</param-value>
</init-param>
<init-param>
<param-name>ContentType</param-name>
<param-value>text/html;charset=UTF-
8
</param-value>
</init-param>
<init-param>
<param-name>template_update_delay</param-name>
<param-value>
0
</param-value>
</init-param>
<init-param>
<param-name>default_encoding</param-name>
<param-value>UTF-
8
</param-value>
</init-param>
<init-param>
<param-name>number_format</param-name>
<param-value>
0
.##########</param-value>
</init-param>
<load-on-startup>
1
</load-on-startup>
</servlet>
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4. [代码]使用自己的标签
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<
@label
id=
21
>
</
@label
>
http://www.oschina.net/code/snippet_114990_4438
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