freemarker标签，指令，自定义标签
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2022-06-08 23:47:56
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freemarker配置详见
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";
}
}