FreeMarker知识点（初学用）

青旅半醒 2023-10-01 17:14 8阅读 0赞

**目录**

FreeMarker

1.主要内容

2.FreeMarker概述

2.1FreeMarker概念

2.2FreeMarker特性

2.3FreeMarker环境搭建

3.FreeMarker的数据类型

3.1布尔类型

3.2.日期类型

3.3.数值类型

3.4.字符串类型

3.5.sequence类型

3.6hash类型

4.FreeMarker常见指令

4.1.assign自定义变量指令

4.2.if, else, elseif

4.3.list指令

4.4.macro自定义指令

4.5.nested占位指令

4.6.import导入指令

4.7.include包含指令

5.FreeMarker页面静态化

5.1.定义模板

5.2加载模板

6.FreeMarker运算符

## FreeMarker ##

[什么是 FreeMarker? - FreeMarker 中文官方参考手册][FreeMarker_ - FreeMarker]

### 1.主要内容 ###

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16][]

### 2.FreeMarker概述 ###

#### 2.1FreeMarker概念 ####

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 1][]

#### 2.2FreeMarker特性 ####

2.2.1.通用目标

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 2][]

2.2.2.强大的模板语言

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 3][]

2.2.3.通用的数据模型

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 4][]

2.2.4.为Web准备

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 5][]

2.2.5.智能的国际化和本地化

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_17_color_FFFFFF_t_70_g_se_x_16][]

2.2.6.强大的XML处理能力

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 6][]

--------------------

#### 2.3FreeMarker环境搭建 ####

2.3.1.新建环境项目

pom.xml文件

<?xml version="1.0" encoding="UTF-8"?>
    
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
      <modelVersion>4.0.0</modelVersion>
    
      <groupId>org.example</groupId>
      <artifactId>ferrmarker</artifactId>
      <version>1.0-SNAPSHOT</version>
      <packaging>war</packaging>
    
      <name>ferrmarker Maven Webapp</name>
      
      <url>http://www.example.com</url>
    
      <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
      </properties>
    
      <dependencies>
        
        <dependency>
          <groupId>org.freemarker</groupId>
          <artifactId>freemarker</artifactId>
          <version>2.3.23</version>
        </dependency>
        
        <dependency>
          <groupId>javax.servlet</groupId>
          <artifactId>javax.servlet-api</artifactId>
          <version>3.0.1</version>
        </dependency>
    
      </dependencies>
    
      <build>
        <finalName>ferrmarker</finalName>
        
        <plugins>
          
          <plugin>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-maven-plugin</artifactId>
            <version>9.2.1.v20140609</version>
          </plugin>
        </plugins>
    
      </build>
    </project>

web.xml文件

<!DOCTYPE web-app PUBLIC
     "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
     "http://java.sun.com/dtd/web-app_2_3.dtd" >
    
    <web-app>
    
      <display-name>Archetype Created Web Application</display-name>
      <servlet>
        <servlet-name>freemarker</servlet-name>
        <servlet-class>freemarker.ext.servlet.FreemarkerServlet</servlet-class>
        <init-param>
    
          <param-name>TemplatePath</param-name>
          <param-value>/</param-value>
        </init-param>
        <init-param>
          
          <param-name>default_encoding</param-name>
          <param-value>UTF-8</param-value>
        </init-param>
      </servlet>
    
      <servlet-mapping>
        <servlet-name>freemarker</servlet-name>
        <url-pattern>*.ftl</url-pattern>
      </servlet-mapping>
    
    
    </web-app>

参考网站:

[https://blog.csdn.net/xysszwx/article/details/109864549?ops\_request\_misc=%257B%2522request%255Fid%2522%253A%2522164344498516780271585367%2522%252C%2522scm%2522%253A%252220140713.130102334.pc%255Fall.%2522%257D&request\_id=164344498516780271585367&biz\_id=0&utm\_medium=distribute.pc\_search\_result.none-task-blog-2~all~first\_rank\_ecpm\_v1~rank\_v31\_ecpm-8-109864549.pc\_search\_insert\_ulrmf&utm\_term=freemarker%E7%9A%84%E5%9D%90%E6%A0%87%E4%BE%9D%E8%B5%96&spm=1018.2226.3001.4187][https_blog.csdn.net_xysszwx_article_details_109864549_ops_request_misc_257B_2522request_255Fid_2522_253A_2522164344498516780271585367_2522_252C_2522scm_2522_253A_252220140713.130102334.pc_255Fall._2522_257D_request_id_164344498516780271585367_biz_id_0_utm_medium_distribute.pc_search_result.none-task-blog-2_all_first_rank_ecpm_v1_rank_v31_ecpm-8-109864549.pc_search_insert_ulrmf_utm_term_freemarker_E7_9A_84_E5_9D_90_E6_A0_87_E4_BE_9D_E8_B5_96_spm_1018.2226.3001.4187]

运行成功

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_16_color_FFFFFF_t_70_g_se_x_16][]

跟着教程一步一步来就好了

[【优极限】JavaWeb-FreeMarker\_超详细视频教程（由浅入深细致讲解，FreeMarker纯干货课程）,FreeMarker美女程序员授课完整版\_哔哩哔哩\_bilibili][JavaWeb-FreeMarker_FreeMarker_FreeMarker_bilibili]

然后就是第一遍做没做出来，第二遍就好了呀

第一遍的问题

问题(1)

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 7][]

工作名和组名那里要改正

问题（2）

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 8][]

jetty:run -Djetty.port=9090

run后面是个空格然后才是-

--------------------

### 3.FreeMarker的数据类型 ###

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 9][]

#### 3.1布尔类型 ####

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 10][]

package com.xxxx.servlet;
    
    import javax.servlet.ServletException;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.io.IOException;
    
    /**
     * @author yanchaochao
     * @date 2022/1/29 19:40
     */
    @WebServlet("/f02")
    public class FreeMarker02 extends HttpServlet {
        @Override
        protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
            //设置数据
            /*布尔类型*/
            req.setAttribute("flag",true);
            req.getRequestDispatcher("template/f02.ftl").forward(req,resp);
        }

f02.ftl文件

<h4>FreeMarker 数据类型</h4>
    
    <#--
        FreeMarker 数据类型
        布尔书数据类型
            不能在FreeMarker直接输出，如果要输出需要转换成字符串
            方式一:？c
            方式二:？string或？string(‘为true显示的内容’，为false时显示的内容)
    -->
    <h5>布尔类型</h5>
    
    ${flag?c}<br>
    ${flag?string}<br>
    ${flag?string('yes','no')}<br>
    ${flag?string('俺喜欢','她不中')}<br>

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_16_color_FFFFFF_t_70_g_se_x_16 1][]

<#--
        FreeMarker 数据类型
        布尔书数据类型
            不能在FreeMarker直接输出，如果要输出需要转换成字符串
            方式一:？c
            方式二:？string或？string(‘为true显示的内容’，为false时显示的内容)
    -->

--------------------

#### 3.2.日期类型 ####

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 11][]

<#--
        FreeMarker 数据类型
        日期类型
            不能在FreeMarker日期类型中直接输出，如果要输出需要转换成日期型或字符串
            1.年月日:    ？date
            2.时分秒:    ？time
            3.年月日时分秒:    ？datetime
            4.自定义格式:    ？string(”自定义")
                            y年    M月    d日
                            H时    m分    s秒
    
    -->

eg:FreeMarker.java文件

package com.xxxx.servlet;
    
    import javax.servlet.ServletException;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.io.IOException;
    import java.util.Date;
    
    /**
     * @author yanchaochao
     * @date 2022/1/29 19:40
     */
    @WebServlet("/f02")
    public class FreeMarker02 extends HttpServlet {
        @Override
        protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
            //设置数据
            /*日期类型*/
            req.setAttribute("createDate",new Date());
    
    
    
    
    
    
    
            //请求转发到指定的模板页面--------template/f02.ftl
            req.getRequestDispatcher("template/f02.ftl").forward(req,resp);
        }
    }

f02.ftl文件

<h4>FreeMarker--数据类型</h4>
    
    <h5>布尔类型</h5>
    ${flag?c}<br>
    ${flag?string}<br>
    ${flag?string('yes','no')}<br>
    ${flag?string('俺喜欢','她不中')}<br>
    <#--、-->
    <#---->
    <#--
        FreeMarker 数据类型
        日期类型
            不能在FreeMarker日期类型中直接输出，如果要输出需要转换成日期型或字符串
            1.年月日:    ？date
            2.时分秒:    ？time
            3.年月日时分秒:    ？datetime
            4.自定义格式:    ？string(”自定义")
                            y年    M月    d日
                            H时    m分    s秒
    
    -->
    <h5>日期类型</h5>
    ${createDate?date}<br>
    ${createDate?time}<br>
    ${createDate?datetime}<br>
    ${createDate?string("yyy/MM/dd HH:mm:ss")}<br>
    
    <#--根据自己的需求格式输出结果-->

--------------------

#### 3.3.数值类型 ####

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 12][]

eg:FreeMarker.java文件

/*数值类型*/
            req.setAttribute("age",18);
            req.setAttribute("num",10000);
            req.setAttribute("avg",5.5467);

f02.ftl文件

<h5>数值类型</h5>
    ${age}<br>
    ${num}<br>
    ${avg}<br>
    <#--将数值转化成字符串类型-->
    ${age?c}<br>
    <#--将数值转化成货币类型-->
    ${num?string.currency}<br>
    <#--将数值转化为百分比类型的字符串-->
    ${num?string.percent}<br>
    <#--将浮点型的数值转化成指定小数输出-->
    ${avg?string["0.##"]}

#### 3.4.字符串类型 ####

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 13][]

eg:FreeMarker.java文件

/*字符串类型*/
            req.setAttribute("msg","hello");
            req.setAttribute("msg2","freemarker");

f02.ftl文件

<h5>字符串类型</h5>
    ${msg}
    ${msg2}
    <#--1.截取字符串-->
    ${msg?substring(0,2)}<br>
    <#--2.首字母小写-->
    ${msg?uncap_first}<br>
    <#--3.首字母大写-->
    ${msg?cap_first}<br>
    <#--4.字母转小写输出-->
    ${msg?lower_case}<br>
    <#--5.字母转大写输出-->
    ${msg?upper_case}<br>
    <#--6.获取字符串的长度-->
    ${msg?length}<br>
    <#--7.是否以指定字符开头-->
    ${msg?starts_with("a")?string}<br>
    <#--8.是否以指定字符结尾-->
    ${msg?ends_with("o")?string}<br>
    <#--9.获取指定字符的索引-->
    ${msg?index_of("m")}<br>
    <#--10.去除字符串前后的空格-->
    ${msg?trim}<br>
    <#--11.替换字符串-->
    ${msg?replace("he","we")}<br>
    <h5>字符串类型</h5>
    ${msg}
    ${msg2}
    <#--1.截取字符串-->
    ${msg?substring(0,2)}<br>
    <#--2.首字母小写-->
    ${msg?uncap_first}<br>
    <#--3.首字母大写-->
    ${msg?cap_first}<br>
    <#--4.字母转小写输出-->
    ${msg?lower_case}<br>
    <#--5.字母转大写输出-->
    ${msg?upper_case}<br>
    <#--6.获取字符串的长度-->
    ${msg?length}<br>
    <#--7.是否以指定字符开头-->
    ${msg?starts_with("a")?string}<br>
    <#--8.是否以指定字符结尾-->
    ${msg?ends_with("o")?string}<br>
    <#--9.获取指定字符的索引-->
    ${msg?index_of("m")}<br>
    <#--10.去除字符串前后的空格-->
    ${msg?trim}<br>
    <#--11.替换字符串-->
    ${msg?replace("he","we")}<br>

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 14][]

字符串空值情况处理

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 15][]

#### 3.5.sequence类型 ####

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 16][]

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 17][]

1.数组

eg:FreeMarker.java文件

//数组
            String[] stars = new String[]{"周杰伦","林俊杰","五月天","陈奕迅"};
            req.setAttribute("stars",stars);

f02.ftl文件

<#--数组操作-->
    <#list stars as stars>
        ${stars}<br>
    </#list>
    获取序列长度:${stars?size}<br>
    获取第一个元素:${stars?first}<br>
    获取最后一个元素:${stars?last}<br>
    <hr>

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 18][]

2.list

eg:FreeMarker.java文件

//List操作
            List<String> citys = Arrays.asList("北京","上海","杭州","深圳");
            req.setAttribute("cityList",citys);

f02.ftl文件

<#--list操作-->
    <#list cityList as city>
        ${city} -
    </#list>
    
    
    <hr>
    <#--排序-->
    <#--倒序输出-->
    <#list cityList?reverse as city>
        ${city} -
    </#list>
    <hr>
    <#--升序输出-->
    <#list cityList?sort as city>
        ${city} -
    </#list>
    <hr>
    <#--降序输出-->
    <#list cityList?sort?reverse  as city>
        ${city} -
    </#list>
    <hr>
    <hr>
    <#list userList as user>
        编号：${user.userId} 
        姓名：${user.uname} 
        编号：${user.uage} 
        <br>
    </#list>
    <hr>

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 19][]

3.JavaBean的排序

eg:FreeMarker.java文件

//JavaBean集合
            List<User> userList = new ArrayList<>();
            userList.add(new User(1,"张三",22));
            userList.add(new User(2,"李四",18));
            userList.add(new User(3,"王五",20));
            req.setAttribute("userList",userList);

User文件

package com.xxxx.servlet.entity;
    
    /**
     * @author yanchaochao
     * @date 2022/1/30 1:43
     */
    public class User {
        private Integer userId;
        private String uname;
        private Integer uage;
    
        public User() {
        }
    
        public User(Integer userId, String uname, Integer uage) {
            this.userId = userId;
            this.uname = uname;
            this.uage = uage;
        }
    
        public Integer getUserId() {
            return userId;
        }
    
        public void setUserId(Integer userId) {
            this.userId = userId;
        }
    
        public String getUname() {
            return uname;
        }
    
        public void setUname(String uname) {
            this.uname = uname;
        }
    
        public Integer getUage() {
            return uage;
        }
    
        public void setUage(Integer uage) {
            this.uage = uage;
        }
    }

f02.ftl文件

<#--JavaBean的排序-->
    <#list userList?sort_by("uage") as user>
        编号：${user.userId} 
        姓名：${user.uname} 
        编号：${user.uage} 
        <br>
    </#list>

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 20][]

#### 3.6hash类型 ####

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 21][]

eg:FreeMarker.java文件

//Map操作
            Map<String,String> cityMap = new HashMap<>();
            cityMap.put("sh","上海");
            cityMap.put("bj","北京");
            cityMap.put("sz","深圳");
            req.setAttribute("cityMap",cityMap);

f02.ftl文件

<#--Hash-->
    <#list cityMap? keys as key>
        ${key}   - ${cityMap[key]}
    </#list>
    <br>
    <#list cityMap? values as value>
        ${value}
    </#list>
    <br>

### 4.FreeMarker常见指令 ###

#### 4.1.assign自定义变量指令 ####

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 22][]

<#assign name1=value1 name2=value2 ... nameN=valueN>
    或
    <#assign same as above... in namespacehash>
    或
    <#assign name>
      capture this
    </#assign>
    或
    <#assign name in namespacehash>
      capture this
    </#assign>

#### 4.2.if, else, elseif ####

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 23][]

eg:FreeMarker03.java文件

package com.xxxx.servlet;
    
    /**
     * @author yanchaochao
     * @date 2022/1/30 2:35
     */
    
    import com.xxxx.servlet.entity.User;
    import javax.net.ssl.ManagerFactoryParameters;
    import javax.servlet.ServletException;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.io.IOException;
    import java.util.*;
    
    @WebServlet("/f03")
    public class FreeMarker03 extends HttpServlet {
        @Override
        protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    
    
    
            //请求转发到指定的模板页面--------template/f03.ftl
            req.getRequestDispatcher("template/f03.ftl").forward(req,resp);
        }
    }

f02.ftl文件

<#--if, else, elseif-->
            <#assign score=60>
            <#if score lt 60>
                <h6>你个小渣渣</h6>
                <#elseif score == 80>
                    <h6>分不在高，及格就行</h6>
                <#elseif score gt 60 &&score lt 80 >
                    <h6>革命尚未成功，同志仍需努力</h6>
                <#else >
                <h6>哎呦不错哦！</h6>
            </#if>
        <#--判断数据是否存在-->
        <#assign list="">
        <#if list??>
            数据存在
            <#else >
            数据不存在
        </#if>

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 24][]

#### 4.3.list指令 ####

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 25][]

eg:FreeMarker03.java文件

f02.ftl文件

<#--list指令-->
        <hr>
        <#assign users = ["张三","李四","王五"]>
        <#list users as user>
        ${user} |
        </#list>
        <br>
        <#--判断数据不为空，再执行遍历(如果序列不存在，直接遍历会报错)-->
        <#if user2??>
            <#list users2 as user>
                ${user}
            </#list>
        </#if>
        <#assign users3=['a']>
        <#list users3 as user>
            ${user}
            <#else >
                用户数据不存在!
        </#list>

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_19_color_FFFFFF_t_70_g_se_x_16][]

#### 4.4.macro自定义指令 ####

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 26][]

<#--macro自定义指令-->
        <#macro address>
            这个就是自定义的指令
        </#macro>
            <#--使用自定义指令-->
            <@address></@address>
            <@address></@address>
            <@address></@address>
        <hr>
        <#--自定义有参数的指令-->
        <#macro queryUserByName uname>
        通过用户名查询用户对象-${uname}
        </#macro>
        <@queryUserByName uname="admin"></@queryUserByName>
        <hr>
        <#macro queryUserByName02 uname upwd phone>
            通过用户名查询用户对象-${uname}-${upwd}-${phone}
        </#macro>
        <@queryUserByName02 uname="张三" upwd= "123456" phone="666"></@queryUserByName02>
    
    <hr>
    <hr>
    <#--做一个九九乘法表-->
    <#macro cfb>
        <#list 1..9 as i>
            <#list 1..i as j>
                ${j} * ${i} = ${j*i}  
            </#list>
            <br>
        </#list>
    </#macro>
    <@cfb></@cfb>
    
    
        <#--升级九九乘法表-->
        <#macro cfb02 num>
            <#list 1..num as i>
                <#list 1..i as j>
                    ${j} * ${i} = ${j*i}  
                </#list>
                <br>
            </#list>
        </#macro>
        <@cfb02 num=5></@cfb02>

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 27][]

#### 4.5.nested占位指令 ####

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 28][]

<#--占位指令-->
    
    <#macro test>
        <#nested >
        <br>
        这是一段文本
        <#nested >
    </#macro>
    <@test>xxxxxxxxxx</@test>

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_12_color_FFFFFF_t_70_g_se_x_16][]

#### 4.6.import导入指令 ####

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 29][]

eg:FreeMarker04.java文件

package com.xxxx.servlet;
    /**
     * @author yanchaochao
     * @date 2022/1/30 11:24
     */
    import javax.servlet.ServletException;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.io.IOException;
    @WebServlet("/f04")
    public class FreeMarker04 extends HttpServlet {
        @Override
        protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    
    
    
            //请求转发到指定的模板页面--------template/f03.ftl
            req.getRequestDispatcher("template/f04.ftl").forward(req,resp);
        }
    }

f04.ftl文件

<#--通过import指令引入命令空间-->
    <#--引用f03文件中的-->
    <#import "f03.ftl" as f3>
    <@f3.cfb></@f3.cfb>
    <hr>
    <#--设置一个通用文件调用-->
    <#import "commons.ftl" as cm>
    <@cm.cfb02 num =5></@cm.cfb02>

commons.ftl文件

<#macro cfb02 num>
        <#list 1..num as i>
            <#list 1..i as j>
                ${j} * ${i} = ${j*i}  
            </#list>
            <br>
        </#list>
    </#macro>
    <@cfb02 num=5></@cfb02>

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 30][]

#### 4.7.include包含指令 ####

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 31][]

f04.ftl文件

<#--包含指令-->
    <#--html文件-->
    <#include "tset.html">

tset.html文件

<!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>包含</title>
    </head>
    <body>
    Hello
    </body>
    </html>

--------------------

### 5.FreeMarker页面静态化 ###

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 32][]

#### 5.1.定义模板 ####

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 33][]

#### 5.2加载模板 ####

NewsServlet.java文件

import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.io.File;
    import java.io.FileWriter;
    import java.io.IOException;
    import java.util.HashMap;
    import java.util.Map;
    
    /**
     * @author yanchaochao
     * @date 2022/1/30 11:50
     */
    @WebServlet("/news")
    public class NewsServlet extends HttpServlet {
        @Override
        protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
            //实例化模板对象
            Configuration configuration = new Configuration();
            //设置加载模板的上下文 以及模板的加载路径(模板的存放路径)
            configuration.setServletContextForTemplateLoading(getServletContext(), "/template");
            //设置模板的编码格式
            configuration.setDefaultEncoding("UTF-8");
            //加载模板文件 获取模板对象
            Template template = configuration.getTemplate("news.ftl");
            //设置数据模型
            Map<String, Object> map = new HashMap<>();
            map.put("title", "国务院联防联控机制：坚决防止春节返乡政策“一刀切”");
            map.put("source", "光明网-《光明日报》");
            map.put("pubTime", "2022-01-30 03:41");
            map.put("content", "春节将至，一些群众返乡遇阻引发社会关注，国家卫健委新闻发言人米锋在1月29日国务院联防联控机制举行的发布会上表示，国务院联防联控机制综合组已进行核实，并及时反馈地方，要求立即整改，坚决防止返乡政策“简单化一刀切，让广大群众度过一个健康、欢乐、祥和的春节。");
            //获取项目的根目录
            String basePath = req.getServletContext().getRealPath("/");
            //设置html的存放路径
            File htmlFile = new File(basePath + "/html");
            //判断文件(目录)是否存在
            if (!htmlFile.exists()) {
                //如果文件目录不存在，则新建文件目录
                htmlFile.mkdir();
            }
            //得到生成的文件名(生成随机不重复的文件名)
            String fileName = System.currentTimeMillis() + ".html";
            //创建html文件
            File file = new File(htmlFile, fileName);
            //获取文件输出流
            FileWriter writer = new FileWriter(file);
            //生成html(将数据模型填充到模板中)
            try {
                template.process(map, writer);
            } catch (TemplateException e) {
                e.printStackTrace();
            } finally {
                //关闭资源
                writer.flush();
                writer.close();
            }
        }
    }

new.ftl

<!DOCTYPE html>
    <html>
    <head>
        <#--freemarker模板中设置编码格式，否则中文有可能乱码-->
        <meta http-equiv="content-type" content="text/html;charset=UTF-8">
    </head>
    <body>
    <#--新闻标题-->
    <h2 align="center">${title}</h2>
    <#--新闻来源和发布时间-->
    <p align="center">
        新闻来源:${source}  
        发布时间:${pubTime}
    </p>
    <#--新闻内容-->
    <p style="text-indent: 2em">
        ${content}
    </p>
    </body>
    </html>

先运行

[http://localhost:9090/news][http_localhost_9090_news]

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 34][]

然后会在webapp中生成1643517894900.html

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 35][]

再次访问

[http://localhost:9090/html/1643517894900.html][http_localhost_9090_html_1643517894900.html]

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 36][]

### 6.FreeMarker运算符 ###

6.1.算术运算符

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 37][]

6.2.逻辑运算符

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 38][]

6.3.比较运算符

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 39][]

6.4.控制运算符

![watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 40][]

--------------------

加我qq拿电子版2895548613

[FreeMarker_ - FreeMarker]: http://freemarker.foofun.cn/
[watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16]: https://img-blog.csdnimg.cn/67502209561742eeb0285b835255e3dc.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg==,size_20,color_FFFFFF,t_70,g_se,x_16
[watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 1]: https://img-blog.csdnimg.cn/581dd670257c4797aa5f5de8ae018eea.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg==,size_20,color_FFFFFF,t_70,g_se,x_16
[watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 2]: https://img-blog.csdnimg.cn/11fff07592354e9a8a44bb94ea4e6bc7.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg==,size_20,color_FFFFFF,t_70,g_se,x_16
[watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 3]: https://img-blog.csdnimg.cn/5159cdf8624a49c3aec1a6792fa57968.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg==,size_20,color_FFFFFF,t_70,g_se,x_16
[watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 4]: https://img-blog.csdnimg.cn/7eecf8f268134871afd56a1076fda8c4.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg==,size_20,color_FFFFFF,t_70,g_se,x_16
[watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 5]: https://img-blog.csdnimg.cn/6e9357285fac4b95b33ad0e952d6b1bb.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg==,size_20,color_FFFFFF,t_70,g_se,x_16
[watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_17_color_FFFFFF_t_70_g_se_x_16]: https://img-blog.csdnimg.cn/2823e1742444417bade9bccaabf56cdf.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg==,size_17,color_FFFFFF,t_70,g_se,x_16
[watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg_size_20_color_FFFFFF_t_70_g_se_x_16 6]: https://img-blog.csdnimg.cn/9445472e028d44d5ac541fe0d280dcb0.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA54ix5L2g55qE6Zi_55m9fg==,size_20,color_FFFFFF,t_70,g_se,x_16
[https_blog.csdn.net_xysszwx_article_details_109864549_ops_request_misc_257B_2522request_255Fid_2522_253A_2522164344498516780271585367_2522_252C_2522scm_2522_253A_252220140713.130102334.pc_255Fall._2522_257D_request_id_164344498516780271585367_biz_id_0_utm_medium_distribute.pc_search_result.none-task-blog-2_all_first_rank_ecpm_v1_rank_v31_ecpm-8-109864549.pc_search_insert_ulrmf_utm_term_freemarker_E7_9A_84_E5_9D_90_E6_A0_87_E4_BE_9D_E8_B5_96_spm_1018.2226.3001.4187]: https://blog.csdn.net/xysszwx/article/details/109864549?ops_request_misc=%7B%22request_id%22%3A%22164344498516780271585367%22%2C%22scm%22%3A%2220140713.130102334.pc_all.%22%7D&request_id=164344498516780271585367&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~all~first_rank_ecpm_v1~rank_v31_ecpm-8-109864549.pc_search_insert_ulrmf&utm_term=freemarker%E7%9A%84%E5%9D%90%E6%A0%87%E4%BE%9D%E8%B5%96&spm=1018.2226.3001.4187
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[JavaWeb-FreeMarker_FreeMarker_FreeMarker_bilibili]: https://www.bilibili.com/video/BV1jt4y1r7Lx?p=2
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[http_localhost_9090_news]: http://localhost:9090/news
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