freemark自定义标签

最新推荐文章于 2021-08-12 18:50:13 发布

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本文介绍了一个使用Freemarker模板引擎实现的UserDirective指令，用于根据用户ID获取并展示用户数据。通过配置参数和指令使用，实现动态数据的灵活展示。

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public class UserDirective implements TemplateDirectiveModel {



    public static final String ID = "id";


    @Autowired
    protected AdminUserService adminUserService;


    @Override
    public void execute(Environment env, Map params, TemplateModel[] loopVars, TemplateDirectiveBody body) throws TemplateException, IOException {
        if (loopVars.length < 1) {
            throw new TemplateModelException("Loop variable is required.");
        }
        if (body == null) {
            throw new RuntimeException("missing body");
        }
        Long id  = Freemarkers.getLong(params,ID);
        AdminUser adminUser = null;
        if(id != null){
            adminUser = adminUserService.findUniqueBy("id",id);
        }

        loopVars[0] = env.getObjectWrapper().wrap(adminUser);
        body.render(env.getOut());

    }
}

<bean id="User" class="com.sr.fore.manage.web.core.directive.UserDirective"/>

<property name="freemarkerSettings">
            <props>

                <prop key="tag_syntax">square_bracket</prop>
                <prop key="template_update_delay">2</prop>
                <prop key="defaultEncoding">UTF-8</prop>
                <prop key="url_escaping_charset">UTF-8</prop>
                <prop key="localized_lookup">false</prop>
                <prop key="locale">zh_CN</prop>
                <prop key="boolean_format">true,false</prop>
                <prop key="datetime_format">yyyy-MM-dd HH:mm:ss</prop>
                <prop key="date_format">yyyy-MM-dd</prop>
                <prop key="time_format">HH:mm:ss</prop>
                <prop key="number_format">0.###</prop>
                <prop key="whitespace_stripping">true</prop>
                <prop key="auto_import">/spring.ftl as s</prop>
            </props>
        </property>

FreeMarkerConfigurationFactory  
setFreemarkerVariables(Map<String, Object> variables)

[#escape x as (x)!?html]
<!DOCTYPE html>
<html>
<head>
    <title></title>
</head>
<body>

[@User id = "1";user]
<table>
    <thead>
    ${user.userName}
    </thead>
</table>
[/@User]
</body>
</html>
[/#escape]

freemarkerVariables 是一个map对象，键对应标签名称，值对应xxxDirective