【FreeMarker】FreeMarker使用（三）
2024-09-24 07:53:58
搭建一个
1、FreeMarker取值
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>逻辑</h1>
<div>
1、取基本值
<ul>
<li>整型：${intValue }</li>
<li>字符串：${stringValue }</li>
<li>double型：${doubleValue }</li>
<li>布尔型：${booleanValue }</li>
<li>时间：${dateValue?string('yyyy-MM-dd') }</li>
<li>null值：${nullValue}</li>
</ul>
2、运算
<ul>
<li>加法：${intValue + 100}</li>
</ul>
3、集合
<ul>
List集合
<#list list as item>
<li>${item}</li>
</#list>
Map集合
<#list map?keys as key>
<li>${key}:${map[key]}</li>
</#list>
</ul>
</div>
</body>
</html>
2、逻辑语法
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>逻辑语法</h1>
<div>
1、if
<ul>
<#assign var=99/>
<#if var == 99 >
<li>var=${var }</li> </#if> <#assign var1=199/>
<#if var1 == 99 >
<li>var1=${var1 }</li>
<#else>
<li>var1=99</li>
</#if> <#assign var2 = 299/>
<#if var2 < 99 >
<li>var2 < 99</li>
<elseif var2 == 99 >
<li>var2 = 299</li>
<#else >
<li>var2 > 99</li>
</#if>
</ul>
2、switch
<ul>
<#assign var=3/>
<#switch var >
<#case >
<li>1</li>
<#case >
<li>2</li>
<#break>
<#case >
<li>3</li>
<#case >
<li>4</li>
<#break>
<#default>
<li>default</li>
</#switch>
</ul> </div>
</body>
</html>
3、字符串处理
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>字符串</h1>
<h2>字符串常用内置函数</h2>
<div>
<ul>
<#assign a='hello'/>
<#assign b='world'/>
<br />"+" 加号连接
<li>a + b = ${a + b }</li>
<br />substring 截取
<li>(a + b)?substring(5,8) = ${(a + b)?substring(5,8) }</li>
<br />length 长度
<li>(a + b)?length = ${(a + b)?length }</li>
<br />upper_case 大写
<li>(a + b)?upper_case = ${(a + b)?upper_case }</li>
<br />lower_case 小写
<li>(a + b)?lower_case = ${(a + b)?lower_case }</li>
<br />index_of 位置
<li>(a + b)?index_of('w') = ${(a + b)?index_of('w') }</li>
<br />replace 替换
<li>(a + b)?replace('w', 'W' ) = ${(a + b)?replace('w', 'W') }</li>
<br />contains 包含
<li>(a + b)?contains('w') = ${(a + b)?contains('w') }</li>
</ul>
</div>
</body>
</html>
4、自定义函数
a、编写自定义函数方法类
package com.test.freemarker.method; import java.math.BigDecimal;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.List; import freemarker.template.SimpleSequence;
import freemarker.template.TemplateMethodModelEx;
import freemarker.template.TemplateModelException; public class SortMethod implements TemplateMethodModelEx{ @Override
public Object exec(List arguments) throws TemplateModelException { // 获取第一个请求参数
// 参数先转freemarker数据类型
SimpleSequence arg0 = (SimpleSequence) arguments.get(0);
List<BigDecimal> list = arg0.toList(); Collections.sort(list, new Comparator<BigDecimal>() { @Override
public int compare(BigDecimal o1, BigDecimal o2) {
return o1.compareTo(o2);
}
}); return list;
} }
b、在model中添加方法
@RequestMapping("/customMethod")
public ModelAndView customMethod() {
ModelAndView modelAndView = new ModelAndView("customMethod");
modelAndView.addObject("sort_int", new SortMethod());
return modelAndView;
}
c、也模板中使用方法
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>自定义函数</h1>
<h2>字符串常用内置函数</h2>
<div>
<#assign myList=[2,3,4,5,1,8,9,7] />
<br />未排序
<ul>
<#list myList as item >
<li>${item }</li>
</#list>
</ul>
<br />排序(sort_int)
<ul>
<#list sort_int(myList) as item >
<li>${item }</li>
</#list>
</ul>
</div>
</body>
</html>
5、指令、自定义指令
a、编辑自定义指令类
package com.test.freemarker.service; import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map; import org.springframework.stereotype.Service; import freemarker.core.Environment;
import freemarker.template.SimpleSequence;
import freemarker.template.TemplateBooleanModel;
import freemarker.template.TemplateDirectiveBody;
import freemarker.template.TemplateDirectiveModel;
import freemarker.template.TemplateException;
import freemarker.template.TemplateModel;
import freemarker.template.TemplateScalarModel; @Service
public class RoleDirectiveModel implements TemplateDirectiveModel{ /**
* env：环境变量
* params：指令参数（存储所需的值，随便是什么Key-Value）
* loopVars：循环变量
* body：指令内容
* 除params外，其他的都能是null
*/
@Override
public void execute(Environment env, Map params, TemplateModel[] loopVars, TemplateDirectiveBody body)
throws TemplateException, IOException {
System.out.println("================="); TemplateScalarModel user = (TemplateScalarModel) params.get("user");
TemplateScalarModel role = (TemplateScalarModel) params.get("role"); if("123456".equals(user.getAsString()) && "admin".equals(role.getAsString())) {
loopVars[0] = TemplateBooleanModel.TRUE;
} List<String> otherRights = new ArrayList<String>();
otherRights.add("add");
otherRights.add("update");
otherRights.add("delete");
loopVars[1] = new SimpleSequence(otherRights); // 输出
body.render(env.getOut());
} }
b、注册自定义指令
<bean id="freemarkerConfig"
class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer">
<property name="templateLoaderPath" value="" />
<property name="freemarkerSettings">
<props>
<!-- 设置标签类型 两种：[] 和 <> , []这种标记解析要快些 -->
<prop key="tag_syntax">auto_detect</prop>
<!-- 检查模板更新时间间隔，默认5s -->
<prop key="template_update_delay">1</prop>
<prop key="default_encoding">UTF-8</prop>
<prop key="url_escaping_charset">UTF-8</prop>
<prop key="locale">zh-CN</prop>
<!-- 时间格式化 -->
<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>
<!-- 去掉多余的空格 -->
<prop key="whitespace_stripping">true</prop>
<prop key="classic_compatible">true</prop>
<prop key="template_exception_handler">ignore</prop>
</props>
</property> <!-- freemarker变量 -->
<property name="freemarkerVariables">
<map>
<entry key="role" value-ref="roleDirectiveModel"></entry>
</map>
</property>
</bean>
c、在模板中使用自定义指令
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>指令</h1>
<h2>List常用指令</h2>
<div>
<#assign myList=[2,3,4,5,1,8,9,7] />
<br />排序指令sort
<ul>
<#list myList?sort as item >
<li>${item_index } - ${item }</li>
</#list>
</ul>
<br />导至输出reverse
<ul>
<#list myList?sort?reverse as item >
<li>${item_index } - ${item }</li>
</#list>
</ul>
<br />大小
<ul>
<li>myList?size - ${myList?size }</li>
<li>myList[3] - ${myList[3] }</li>
</ul>
</div>
<h2>自定义指令</h2> <div>
<@role user='123456' role='admin' ; result1, result2 >
<br />例：用户123456 是否拥有admin角色，并返回admin权限
<ul>
<#if result1 >
<li>我的角色是: amdin</li>
</#if>
我拥有的权限是：
<#list result2 as item >
<li>${item }</li>
</#list>
</ul>
</@role>
</div>
</body>
</html>
6、FreeMarker内置函数
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>内建函数</h1>
<h2>1、字符串内建函数</h2>
<div>
<#assign myList=[2,3,4,5,1,8,9,7] />
<br />split
<ul>
<#list 'a|b|c|d'?split('|') as item >
<li>${item }</li>
</#list>
</ul>
<br />字符串转日期
<ul>
<#assign var1 = "01/03/2017"?date("MM/dd/yyyy") />
<#assign var2 = "15:05:30"?time("HH:mm:ss") />
<#assign var3 = "2019-07-22 03:05 PM"?datetime("yyyy-MM-dd HH:mm") />
<li>${var1 }</li>
<li>${var2 }</li>
<li>${var3 }</li>
</ul>
</div>
<h2>2、数字内建函数</h2>
<div>
<#assign numVar1=3.1415926 />
<br />3.1415926
<ul>
<li>${numVar1?string("0.##") }</li>
<li>${numVar1?round }</li>
</ul>
</div>
<h2>3、List内建函数</h2>
<div>
<#assign myList1=[2,3,4,5,1,8,6,9,7] />
<br />chunk
<ul>
<li>${myList1?chunk(3)?size }</li>
<#list myList1?chunk(3)?last as item >
<li>${item }</li>
</#list>
</ul>
</div>
<h2>4、其他内建函数</h2>
<div>
<#assign sVar="hello" />
<br />hello
<ul>
<li>${sVar?is_number?string('yes', 'no') }</li>
<li>${sVar?has_content?string('yes', 'no') }</li>
<li>${"1" + "2" ? eval }</li>
<li>${vDefault!"sss" }</li>
</ul>
</div> </body>
</html>
7、macro宏指令
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>模板中使用macro指令定义</h1>
<h2>1、macro:宏指令</h2>
<div>
<br />无参数的macro
<ul>
<#macro test>
<li>我是无参的macro</li>
</#macro>
<@test />
</ul>
<br />有参数的macro
<ul>
<#macro test param1 param2>
<li>我是有参的macro param1 = ${param1}, param2 = ${param2}</li>
</#macro>
<@test param1="java" param2="python" />
</ul>
<br />有默认值参数的macro
<ul>
<#macro test param1 param2="def">
<li>我是有默认值参数的macro param1 = ${param1}, param2 = ${param2}</li>
</#macro>
<@test param1="java" />
</ul>
<br />有多个参数的macro
<ul>
<#macro test param1 param2="def" paramExt... >
<li>有多个参数的macro param1 = ${param1}, param2 = ${param2}</li>
<li>${paramExt["param3"]} </li>
</#macro>
<@test param1="java" param2="python" param3="html"/>
</ul>
</div>
<h2>2、nested</h2>
<div>
<br />嵌套 <ul>
<#macro test param1="java">
<li>${param1 }</li>我是无参的macro<br />
<#nested param1, "我的nested 参数">
</#macro>
<@test param1="java1"; loopVar1, loopVar2>
<font color="red">hello ${loopVar1}, ${loopVar2}</font>
</@test>
<@test param1="java2"; loopVar1, loopVar2>
hello ${loopVar1}, ${loopVar2}
</@test>
</ul>
</div>
<h2>2、函数</h2>
<div>
<br />函数调用 <ul>
<#function doAdd param1 param2>
<#return param1+param2 >
</#function>
<li>${doAdd(20, 30) }</li>
</ul>
</div> </body>
</html>
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