【FreeMarker】FreeMarker使用（三）

　　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 &lt; 99 > 
27                  <li>var2 &lt; 99</li>
28              <elseif var2 == 99 >
29                  <li>var2 = 299</li>
30              <#else >
31                  <li>var2 &gt; 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>