2019独角兽企业重金招聘Python工程师标准>>>

spring mvc +freemarker的项目中，我们想要在html页面上利用自定义标签，来方便完成我们的一些功能，除了在页面上定义标签外，我们还可以利用程序来定义。
首先要写一个类UpperDirective.Java来实现TemplateDirectiveModel接口，
代码如下：
[java] view plain copy
public class UpperDirective implements TemplateDirectiveModel  {  @Override  public void execute(Environment env, Map map, TemplateModel[] templateModels,  TemplateDirectiveBody body) throws TemplateException, IOException {  if(!map.isEmpty()){  throw new TemplateModelException("this directive doesn't allow parameters");  }  if(templateModels.length!=0){  throw new TemplateModelException("this directive doesn't allow variables");  }  if(body!=null){  body.render(new UpperCaseFilterWriter(env.getOut()));  }else{  throw new RuntimeException("missing body");  }  }  }
class UpperCaseFilterWriter extends Writer{  private final Writer out;  public UpperCaseFilterWriter(Writer out) {  this.out=out;  }  @Override  public void write(char[] cbuf, int off, int len) throws IOException {  char[] transformedCbuf = new char[len];  for(int i=0;i<len;i++){  transformedCbuf[i]=Character.toUpperCase(cbuf[i+off]);  }  out.write(transformedCbuf);  }  @Override  public void flush() throws IOException {  out.flush();  }  @Override  public void close() throws IOException {  out.close();  }  }
然后在配置文件中进行配置：
[html] view plain copy
<bean id="freemarkerConfig"   class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer">  <property name="templateLoaderPath">  <value>/ftl/</value>  </property>  <property name="freemarkerSettings">  <props>  <prop key="locale">zh_CN</prop>  <prop key="defaultEncoding">UTF-8</prop>  <prop key="date_format">yyyy-MM-dd</prop>  <prop key="time_format">HH:mm:ss</prop>  <prop key="datetime_format">yyyy-MM-dd HH:mm:ss</prop>  <prop key="number_format">0.################</prop>  </props>  </property>  <property name="freemarkerVariables">  <map>  <entry key="upper" value-ref="upperDirective"></entry>  </map>  </property>    </bean>  <bean id="upperDirective" class="com.nbsh.cms.util.UpperDirective"></bean>   在页面上输出的标签：<@upper>hh</@upper>  就能输出大写的：HH了。

http://blog.csdn.net/uk8692/article/details/38176263