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How to integrate freemarker in springboot

王林forward: 2023-05-17 18:07:06757browse

Dependency

<parent>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-parent</artifactId>
  <version>2.1.6.RELEASE</version>
</parent>

<dependencies>
  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-freemarker</artifactId>
  </dependency>
  <dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
  </dependency>
  <dependency>
    <groupId>com.squareup.okhttp3</groupId>
    <artifactId>okhttp</artifactId>
    <version>3.9.1</version>
  </dependency>
  <dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.6</version>
  </dependency>

  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
  </dependency>
  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
  </dependency>
</dependencies>

application.yml

application parameter path

server:
 port: 8001
spring:
 application:
  name: test-freemarker
 freemarker:
  cache: false
  settings:
   template_update_delay: 0
  template-loader-path: classpath:/templates/

Startup class

@SpringBootApplication
public class FreemarkerApplication {
  public static void main(String[] args) {
    SpringApplication.run(FreemarkerApplication.class, args);
  }
  @Bean
  public RestTemplate restTemplate(){
    return new RestTemplate(new OkHttp3ClientHttpRequestFactory());
  }
}

Template file

<!DOCTYPE html>
<!-- resources/templates/test2.ftl -->
<html>
<head lang="en">
  <meta charset="UTF-8"/>
  <title></title>
</head>
<body>
  <table>
    <tr>
      <td>序号</td>
      <td>姓名</td>
      <td>年龄</td>
      <td>金钱</td>
      <td>出生日期</td>
    </tr>
    <#if students??>
      <#list students as stu>
        <tr>
          <td>${stu_index}</td>
          <td <#if (stu.name == &#39;刘备&#39;)></#if> >${stu.name}</td>
          <td <#if (stu.age < 20)></#if>>${stu.age}</td>
          <td>${stu.money}</td>
          <td>${stu.birthday?date},${stu.birthday?time},${stu.birthday?string("yyyy年MM月dd日")}</td>
        </tr>
      </#list>
    </#if>
  </table>
姓名：${stuMap['stu1'].name}
年龄: ${stuMap.stu1.age}
<#list stuMap?keys as k>
  姓名: ${stuMap[k].name}
  年龄: ${stuMap[k].age}
</#list>
${stuMap???c}//判断是否存在，和使用 ?c 输出字符串
${students???c}
${(mozq.bank.address)!'中国建设银行'}//默认值方式处理空值

${students?size}//集合大小
<#assign text="{&#39;bank&#39;:&#39;中国农业银行&#39;, &#39;address&#39;:&#39;北大街&#39;}">
<#assign data=text?eval>
开户行: ${data.bank} 地址: ${data.address}
${123456123?c}//不显示逗号分隔
${123456123}//默认显示逗号分隔
</body>
</html>

<!DOCTYPE html>
<!-- resources/templates/index_banner.ftl -->
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title>Title</title>
  </head>
  <body>
    <div class="banner-roll">
      <#if model??>
        <#list model as item>
          <div class="item" ></div>
          </#list>
        </#if>
    </div>
    </div>
  <script type="text/javascript">
    //...
  </script>
  </body>
</html>

Controller

package com.mozq.springboot.freemarker.controller;

import com.mozq.springboot.freemarker.model.Student;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.client.RestTemplate;

import java.util.*;

@Controller //注意不要使用 @RestController
@RequestMapping("/freemarker")
public class FreeMarkerController {

  @Autowired
  private RestTemplate restTemplate;

  @RequestMapping("/banner")
  public String banner(Map<String,Object> map){
    String dataUrl = "http://localhost:31001/cms/config/getmodel/5a791725dd573c3574ee333f";
    ResponseEntity<Map> entity = restTemplate.getForEntity(dataUrl, Map.class);
    Map body = entity.getBody();
    map.putAll((Map<? extends String, ?>) body);
    //    restTemplate.getForEntity("")
    return "index_banner";
  }

  @RequestMapping("/test2")
  public String test2(Map<String,Object> map){
    Student stu1 = new Student();
    stu1.setName("刘备");
    stu1.setAge(18);
    stu1.setBirthday(new Date());
    stu1.setMoney(22225.8F);

    Student stu2 = new Student();
    stu2.setName("孙权");
    stu2.setAge(20);
    stu2.setBirthday(new Date());
    stu2.setMoney(24525.8F);
    stu2.setBestFriend(stu1);

    List<Student> students = new ArrayList<>();
    students.add(stu1);
    students.add(stu2);
    //模板使用的数据
    map.put("students", students);

    HashMap<String, Student> stuMap = new HashMap<>();
    stuMap.put("stu1", stu1);
    stuMap.put("stu2", stu2);
    map.put("stuMap", stuMap);
    //返回模板的位置，基于 resources/templates
    return "test2";
  }
}

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