freemarker标签，指令，自定义标签

雨点打透心脏的1/2处 2022-05-31 14:08 255阅读 0赞

freemarker配置详见  
[http://blog.csdn.net/fengqingyuebai19/article/details/79378945][http_blog.csdn.net_fengqingyuebai19_article_details_79378945]  
简单的来说freemarker能改变html中的$\{value\}中的value，实现网页的动态变化。  
freemarker有以下几个定义：

1.ftl标签：就是已<\#>开头的那些命令 比如<\#if

2.directives 指令 ：比如例子中的table

3.自定义标签，新建一个global.ftl 模板， 定义myTag标签，name是入参，hello $\{name\} 是返回值。然后在application-context.xml中添加freemarkerSettings，配置模板的引用

global.ftl

<#macro myTag name >
    hello ${name}
    </#macro>

application-context.xml，global.ftl as g以后就用@g.myTag 进行标签的调用

<bean id="freemarkerConfig"
            class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer">
            <property name="templateLoaderPath" value="WEB-INF/" />
            <property name="defaultEncoding" value="UTF-8" />
            <property name="freemarkerSettings">
                <props>
                    <prop key="auto_import">/config/ftl/spring.ftl as
                        spring,/config/ftl/global.ftl as g</prop>
                </props>
            </property>
        </bean>

hello.html

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <title>hello</title>
    </head>
    <body>
    
    hello ${book!}
    
    <p>ftl标签:</p>
    <#if book== "234">yes, the book is 234</#if>
    <#if book!= "234">no, the book is not 234</#if>
    <p>指令:</p>
    <table border=1>
    <tr><th>书名<th>价格
    <tr><td>${book}<td>${price!0}
    </table>
    
    <p>自定义标签:</p>
    <@g.myTag name="Jone"/>
    
    </body>
    </html>

HelloWorldController

package com.my.demo.web;
    
    import javax.servlet.http.HttpServletRequest;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.Model;
    import org.springframework.web.bind.annotation.RequestMapping;
    
    @Controller
    public class HelloWorldController {
    
        @RequestMapping("hello")
        public String loginFunction(HttpServletRequest request, Model model){
            System.out.println("controller start");
            model.addAttribute("book","123");
            System.out.println("controller end");
            return "hello";
        }
    
    }

[http_blog.csdn.net_fengqingyuebai19_article_details_79378945]: http://blog.csdn.net/fengqingyuebai19/article/details/79378945