freemarker自定义标签

/**
 * 自定义freemarker方法或函数，在此注入
 * 
 * @author haojiabin
 * @version $Revision: 1.0 $, $Date: 2010-5-12 下午02:37:39 $
 */
public class ExtendedFreemarkerManager extends FreemarkerManager {

    @Override
    protected Configuration createConfiguration(ServletContext servletContext)
            throws TemplateException {
        Configuration configuration = super.createConfiguration(servletContext);
        configuration.setSharedVariable("enums", BeansWrapper
                .getDefaultInstance().getEnumModels()); // 枚举类处理
        configuration.setSharedVariable("statics", BeansWrapper
                .getDefaultInstance().getStaticModels()); // 枚举类处理

        configuration.setSharedVariable("datetime", new DatetimeMethod()); 
        return configuration;
    }
}

public class DatetimeMethod implements TemplateMethodModel {

    private static final String DEFAULT_PATTERN = "yyyy-MM-dd HH:mm:ss";

    @SuppressWarnings("unchecked")
    public Object exec(List args) throws TemplateModelException {
        Date date = new Date();
        String pattern = args.get(0).toString();
       try {
            return new SimpleDateFormat(pattern).format(date);
        } catch (RuntimeException e) {
            return new SimpleDateFormat(DEFAULT_PATTERN).format(date);
        }
    }
}

配置strut.xml
<constant name="struts.freemarker.manager.classname" value="net.zdsoft.havewin.common.util.ExtendedFreemarkerManager" />