搭建一个
1、FreeMarker取值
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <meta charset="UTF-8"> 5 <title>Insert title here</title> 6 </head> 7 <body> 8 <h1>逻辑</h1> 9 <div> 10 1、取基本值 11 <ul> 12 <li>整型：${intValue }</li> 13 <li>字符串：${stringValue }</li> 14 <li>double型：${doubleValue }</li> 15 <li>布尔型：${booleanValue }</li> 16 <li>时间：${dateValue?string('yyyy-MM-dd') }</li> 17 <li>null值：${nullValue}</li> 18 </ul> 19 2、运算 20 <ul> 21 <li>加法：${intValue + 100}</li> 22 </ul> 23 3、集合 24 <ul> 25 List集合 26 <#list list as item> 27 <li>${item}</li> 28 </#list> 29 Map集合 30 <#list map?keys as key> 31 <li>${key}:${map[key]}</li> 32 </#list> 33 </ul> 34 </div> 35 </body> 36 </html>
2、逻辑语法
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <meta charset="UTF-8"> 5 <title>Insert title here</title> 6 </head> 7 <body> 8 <h1>逻辑语法</h1> 9 <div> 10 1、if 11 <ul> 12 <#assign var=99/> 13 <#if var == 99 > 14 <li>var=${var }</li> 15 16 </#if> 17 18 <#assign var1=199/> 19 <#if var1 == 99 > 20 <li>var1=${var1 }</li> 21 <#else> 22 <li>var1=99</li> 23 </#if> 24 25 <#assign var2 = 299/> 26 <#if var2 < 99 > 27 <li>var2 < 99</li> 28 <elseif var2 == 99 > 29 <li>var2 = 299</li> 30 <#else > 31 <li>var2 > 99</li> 32 </#if> 33 </ul> 34 2、switch 35 <ul> 36 <#assign var=3/> 37 <#switch var > 38 <#case 1> 39 <li>1</li> 40 <#case 2> 41 <li>2</li> 42 <#break> 43 <#case 3> 44 <li>3</li> 45 <#case 4> 46 <li>4</li> 47 <#break> 48 <#default> 49 <li>default</li> 50 </#switch> 51 </ul> 52 53 </div> 54 </body> 55 </html>
3、字符串处理
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <meta charset="UTF-8"> 5 <title>Insert title here</title> 6 </head> 7 <body> 8 <h1>字符串</h1> 9 <h2>字符串常用内置函数</h2> 10 <div> 11 <ul> 12 <#assign a='hello'/> 13 <#assign b='world'/> 14 <br />"+" 加号连接 15 <li>a + b = ${a + b }</li> 16 <br />substring 截取 17 <li>(a + b)?substring(5,8) = ${(a + b)?substring(5,8) }</li> 18 <br />length 长度 19 <li>(a + b)?length = ${(a + b)?length }</li> 20 <br />upper_case 大写 21 <li>(a + b)?upper_case = ${(a + b)?upper_case }</li> 22 <br />lower_case 小写 23 <li>(a + b)?lower_case = ${(a + b)?lower_case }</li> 24 <br />index_of 位置 25 <li>(a + b)?index_of('w') = ${(a + b)?index_of('w') }</li> 26 <br />replace 替换 27 <li>(a + b)?replace('w', 'W' ) = ${(a + b)?replace('w', 'W') }</li> 28 <br />contains 包含 29 <li>(a + b)?contains('w') = ${(a + b)?contains('w') }</li> 30 </ul> 31 </div> 32 </body> 33 </html>
4、自定义函数
a、编写自定义函数方法类
1 package com.test.freemarker.method; 2 3 import java.math.BigDecimal; 4 import java.util.Collection; 5 import java.util.Collections; 6 import java.util.Comparator; 7 import java.util.List; 8 9 import freemarker.template.SimpleSequence; 10 import freemarker.template.TemplateMethodModelEx; 11 import freemarker.template.TemplateModelException; 12 13 public class SortMethod implements TemplateMethodModelEx{ 14 15 @Override 16 public Object exec(List arguments) throws TemplateModelException { 17 18 // 获取第一个请求参数 19 // 参数先转freemarker数据类型 20 SimpleSequence arg0 = (SimpleSequence) arguments.get(0); 21 List<BigDecimal> list = arg0.toList(); 22 23 Collections.sort(list, new Comparator<BigDecimal>() { 24 25 @Override 26 public int compare(BigDecimal o1, BigDecimal o2) { 27 return o1.compareTo(o2); 28 } 29 }); 30 31 return list; 32 } 33 34 }
b、在model中添加方法
1 @RequestMapping("/customMethod") 2 public ModelAndView customMethod() { 3 ModelAndView modelAndView = new ModelAndView("customMethod"); 4 modelAndView.addObject("sort_int", new SortMethod()); 5 return modelAndView; 6 }
c、也模板中使用方法
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <meta charset="UTF-8"> 5 <title>Insert title here</title> 6 </head> 7 <body> 8 <h1>自定义函数</h1> 9 <h2>字符串常用内置函数</h2> 10 <div> 11 <#assign myList=[2,3,4,5,1,8,9,7] /> 12 <br />未排序 13 <ul> 14 <#list myList as item > 15 <li>${item }</li> 16 </#list> 17 </ul> 18 <br />排序(sort_int) 19 <ul> 20 <#list sort_int(myList) as item > 21 <li>${item }</li> 22 </#list> 23 </ul> 24 </div> 25 </body> 26 </html>
5、指令、自定义指令
a、编辑自定义指令类
1 package com.test.freemarker.service; 2 3 import java.io.IOException; 4 import java.util.ArrayList; 5 import java.util.List; 6 import java.util.Map; 7 8 import org.springframework.stereotype.Service; 9 10 import freemarker.core.Environment; 11 import freemarker.template.SimpleSequence; 12 import freemarker.template.TemplateBooleanModel; 13 import freemarker.template.TemplateDirectiveBody; 14 import freemarker.template.TemplateDirectiveModel; 15 import freemarker.template.TemplateException; 16 import freemarker.template.TemplateModel; 17 import freemarker.template.TemplateScalarModel; 18 19 @Service 20 public class RoleDirectiveModel implements TemplateDirectiveModel{ 21 22 /** 23 * env：环境变量 24 * params：指令参数（存储所需的值，随便是什么Key-Value） 25 * loopVars：循环变量 26 * body：指令内容 27 * 除params外，其他的都能是null 28 */ 29 @Override 30 public void execute(Environment env, Map params, TemplateModel[] loopVars, TemplateDirectiveBody body) 31 throws TemplateException, IOException { 32 System.out.println("================="); 33 34 TemplateScalarModel user = (TemplateScalarModel) params.get("user"); 35 TemplateScalarModel role = (TemplateScalarModel) params.get("role"); 36 37 if("123456".equals(user.getAsString()) && "admin".equals(role.getAsString())) { 38 loopVars[0] = TemplateBooleanModel.TRUE; 39 } 40 41 List<String> otherRights = new ArrayList<String>(); 42 otherRights.add("add"); 43 otherRights.add("update"); 44 otherRights.add("delete"); 45 loopVars[1] = new SimpleSequence(otherRights); 46 47 // 输出 48 body.render(env.getOut()); 49 } 50 51 }
b、注册自定义指令
1 <bean id="freemarkerConfig" 2 class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer"> 3 <property name="templateLoaderPath" value="" /> 4 <property name="freemarkerSettings"> 5 <props> 6 <!-- 设置标签类型 两种：[] 和 <> , []这种标记解析要快些 --> 7 <prop key="tag_syntax">auto_detect</prop> 8 <!-- 检查模板更新时间间隔，默认5s --> 9 <prop key="template_update_delay">1</prop> 10 <prop key="default_encoding">UTF-8</prop> 11 <prop key="url_escaping_charset">UTF-8</prop> 12 <prop key="locale">zh-CN</prop> 13 <!-- 时间格式化 --> 14 <prop key="datetime_format">yyyy-MM-dd HH:mm:ss</prop> 15 <prop key="date_format">yyyy-MM-dd</prop> 16 <prop key="time_format">HH:mm:ss</prop> 17 <prop key="number_format">0.##########</prop> 18 <!-- 去掉多余的空格 --> 19 <prop key="whitespace_stripping">true</prop> 20 <prop key="classic_compatible">true</prop> 21 <prop key="template_exception_handler">ignore</prop> 22 </props> 23 </property> 24 25 <!-- freemarker变量 --> 26 <property name="freemarkerVariables"> 27 <map> 28 <entry key="role" value-ref="roleDirectiveModel"></entry> 29 </map> 30 </property> 31 </bean>
c、在模板中使用自定义指令
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <meta charset="UTF-8"> 5 <title>Insert title here</title> 6 </head> 7 <body> 8 <h1>指令</h1> 9 <h2>List常用指令</h2> 10 <div> 11 <#assign myList=[2,3,4,5,1,8,9,7] /> 12 <br />排序指令sort 13 <ul> 14 <#list myList?sort as item > 15 <li>${item_index } - ${item }</li> 16 </#list> 17 </ul> 18 <br />导至输出reverse 19 <ul> 20 <#list myList?sort?reverse as item > 21 <li>${item_index } - ${item }</li> 22 </#list> 23 </ul> 24 <br />大小 25 <ul> 26 <li>myList?size - ${myList?size }</li> 27 <li>myList[3] - ${myList[3] }</li> 28 </ul> 29 </div> 30 <h2>自定义指令</h2> 31 32 <div> 33 <@role user='123456' role='admin' ; result1, result2 > 34 <br />例：用户123456 是否拥有admin角色，并返回admin权限 35 <ul> 36 <#if result1 > 37 <li>我的角色是: amdin</li> 38 </#if> 39 我拥有的权限是： 40 <#list result2 as item > 41 <li>${item }</li> 42 </#list> 43 </ul> 44 </@role> 45 </div> 46 </body> 47 </html>
6、FreeMarker内置函数
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <meta charset="UTF-8"> 5 <title>Insert title here</title> 6 </head> 7 <body> 8 <h1>内建函数</h1> 9 <h2>1、字符串内建函数</h2> 10 <div> 11 <#assign myList=[2,3,4,5,1,8,9,7] /> 12 <br />split 13 <ul> 14 <#list 'a|b|c|d'?split('|') as item > 15 <li>${item }</li> 16 </#list> 17 </ul> 18 <br />字符串转日期 19 <ul> 20 <#assign var1 = "01/03/2017"?date("MM/dd/yyyy") /> 21 <#assign var2 = "15:05:30"?time("HH:mm:ss") /> 22 <#assign var3 = "2019-07-22 03:05 PM"?datetime("yyyy-MM-dd HH:mm") /> 23 <li>${var1 }</li> 24 <li>${var2 }</li> 25 <li>${var3 }</li> 26 </ul> 27 </div> 28 <h2>2、数字内建函数</h2> 29 <div> 30 <#assign numVar1=3.1415926 /> 31 <br />3.1415926 32 <ul> 33 <li>${numVar1?string("0.##") }</li> 34 <li>${numVar1?round }</li> 35 </ul> 36 </div> 37 <h2>3、List内建函数</h2> 38 <div> 39 <#assign myList1=[2,3,4,5,1,8,6,9,7] /> 40 <br />chunk 41 <ul> 42 <li>${myList1?chunk(3)?size }</li> 43 <#list myList1?chunk(3)?last as item > 44 <li>${item }</li> 45 </#list> 46 </ul> 47 </div> 48 <h2>4、其他内建函数</h2> 49 <div> 50 <#assign sVar="hello" /> 51 <br />hello 52 <ul> 53 <li>${sVar?is_number?string('yes', 'no') }</li> 54 <li>${sVar?has_content?string('yes', 'no') }</li> 55 <li>${"1" + "2" ? eval }</li> 56 <li>${vDefault!"sss" }</li> 57 </ul> 58 </div> 59 60 </body> 61 </html>
7、macro宏指令
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <meta charset="UTF-8"> 5 <title>Insert title here</title> 6 </head> 7 <body> 8 <h1>模板中使用macro指令定义</h1> 9 <h2>1、macro:宏指令</h2> 10 <div> 11 <br />无参数的macro 12 <ul> 13 <#macro test> 14 <li>我是无参的macro</li> 15 </#macro> 16 <@test /> 17 </ul> 18 <br />有参数的macro 19 <ul> 20 <#macro test param1 param2> 21 <li>我是有参的macro param1 = ${param1}, param2 = ${param2}</li> 22 </#macro> 23 <@test param1="java" param2="python" /> 24 </ul> 25 <br />有默认值参数的macro 26 <ul> 27 <#macro test param1 param2="def"> 28 <li>我是有默认值参数的macro param1 = ${param1}, param2 = ${param2}</li> 29 </#macro> 30 <@test param1="java" /> 31 </ul> 32 <br />有多个参数的macro 33 <ul> 34 <#macro test param1 param2="def" paramExt... > 35 <li>有多个参数的macro param1 = ${param1}, param2 = ${param2}</li> 36 <li>${paramExt["param3"]} </li> 37 </#macro> 38 <@test param1="java" param2="python" param3="html"/> 39 </ul> 40 </div> 41 <h2>2、nested</h2> 42 <div> 43 <br />嵌套 44 45 <ul> 46 <#macro test param1="java"> 47 <li>${param1 }</li>我是无参的macro<br /> 48 <#nested param1, "我的nested 参数"> 49 </#macro> 50 <@test param1="java1"; loopVar1, loopVar2> 51 <font color="red">hello ${loopVar1}, ${loopVar2}</font> 52 </@test> 53 <@test param1="java2"; loopVar1, loopVar2> 54 hello ${loopVar1}, ${loopVar2} 55 </@test> 56 </ul> 57 </div> 58 <h2>2、函数</h2> 59 <div> 60 <br />函数调用 61 62 <ul> 63 <#function doAdd param1 param2> 64 <#return param1+param2 > 65 </#function> 66 <li>${doAdd(20, 30) }</li> 67 </ul> 68 </div> 69 70 </body> 71 </html>