[Freemarker]自定义时间戳函数

<bean id="freemarkerConfig"
        class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer">
        <property name="templateLoaderPath" value="/WEB-INF/ftl/" />
        <property name="defaultEncoding" value="UTF-8" />
        <property name="freemarkerSettings">
            <props>
                <prop key="template_update_delay">0</prop>
                <prop key="locale">zh_CN</prop>
                <prop key="default_encoding">UTF-8</prop>
            </props>
        </property>
        <!-- 全局变量部分 -->
        <property name="freemarkerVariables">
            <map>
                <entry key="urlTimestamp" value-ref="urlTimestampMethod" />
            </map>
        </property>
    </bean>
    <bean id="urlTimestampMethod" class="com.xxx.UrlTimestampMethodModel" />

//必须实现freemarker.template.TemplateDirectiveModel
@Component
public class UrlTimestampMethodModel implements TemplateDirectiveModel {

    @Override
    public void execute(Environment env, Map params, TemplateModel[] loopVars, TemplateDirectiveBody body)
            throws TemplateException, IOException {
        // 当前时间毫秒数 + 四位随机
        String strTimestamp = "";
        try {
            strTimestamp = String.valueOf(System.currentTimeMillis()) + getRandom(1000, 9999);
        } catch (Exception ex) {
        }
        env.getOut().write(strTimestamp);
    }

    private int getRandom(int min, int max) {
        Random random = new Random();
        return Integer.parseInt(String.valueOf(random.nextInt(max) % (max - min + 1) + min));
    }
}

<a href="http://abc.com?t=<@urlTimestamp />">123</a>