使用freemarker的web项目经常需要用在Url后面加上时间戳来保证资源不被缓存，我们可以自定义方法实现时间戳。
配置
Spring中的freemarker配置信息
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| <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>
<property name="freemarkerVariables">
<map>
<entry key="urlTimestamp" value-ref="urlTimesTampDirective" />
</map>
</property>
</bean>
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实现代码
- 必须实现
freemarker.template.TemplateDirectiveModel
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| @Component("urlTimesTampDirective")
public class UrlTimesTampDirective extends BaseDirective {
@SuppressWarnings("rawtypes")
@Override
public void execute(Environment env, Map params, TemplateModel[] loopVars, TemplateDirectiveBody body)
throws TemplateException, IOException {
String strTimestamp = "";
try {
strTimestamp = String.valueOf(System.currentTimeMillis()) + getRandom(1000, 9999);
Writer out = env.getOut();
out.write(strTimestamp);
} catch (Exception ex) {
ex.printStackTrace();
}
}
private int getRandom(int min, int max) {
Random random = new Random();
return Integer.parseInt(String.valueOf(random.nextInt(max) % (max - min + 1) + min));
}
}
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使用
<a href="http://code.skyheng.com?t=<@urlTimestamp />">我的博客</a><script src="${ctx}/resources/base/common.js?t=<@urlTimestamp/>"></script>
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