Freemarker官网

Template + data-model = output - Apache FreeMarker Manualhttps://freemarker.apache.org/docs/dgui_quickstart_basics.html

整体结构

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1、在pom文件中导入依赖

  <dependencies>
        <!--spring-boot-start启动器-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <!--web启动器-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--freemarker模板-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-freemarker</artifactId>
        </dependency>
        <!--lombok作用实体类-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>

    </dependencies>

父工程版本依赖

因为此处引用了父工程的版本依赖，附上

<properties>
        <java.version>1.8</java.version>
        <tomcat.version>8.5.28</tomcat.version>
        <!--<spring-boot.version>2.0.6.RELEASE</spring-boot.version>-->
        <springframework.version>5.0.5.RELEASE</springframework.version>
        <mybatis-spring-boot.version>1.3.1</mybatis-spring-boot.version>
        <mybatis.version>3.4.5</mybatis.version>
        <druid.version>1.1.6</druid.version>
        <commons-io.version>2.6</commons-io.version>
        <org.apache.commons.io.version>1.3.2</org.apache.commons.io.version>
        <commons-fileupload.version>1.3.3</commons-fileupload.version>
        <commons-codec.version>1.10</commons-codec.version>
        <commons-lang3.version>3.6</commons-lang3.version>
        <okhttp.version>3.9.1</okhttp.version>
        <feign-okhttp.version>8.18.0</feign-okhttp.version>
        <lombok.version>1.18.20</lombok.version>
        <springfox-swagger.version>2.7.0</springfox-swagger.version>
        <fastjson.version>1.2.30</fastjson.version>
        <fastdfs-client-java.version>1.27.0.0</fastdfs-client-java.version>
        <mysql-connector-java.version>8.0.11</mysql-connector-java.version>
        <elasticsearch.version>6.2.1</elasticsearch.version>
        <guava.version>24.0-jre</guava.version>
        <spring-cloud.version>Greenwich.SR2</spring-cloud.version>
        <!--<spring-cloud.version>Finchley.SR1</spring-cloud.version>-->
    </properties>
    <!--test-->
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>2.1.3.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!-- <dependency>
                 <groupId>org.springframework.cloud</groupId>
                 <artifactId>spring-cloud-dependencies</artifactId>
                 <version>Greenwich.RELEASE</version>
                 <type>pom</type>
                 <scope>import</scope>
             </dependency>-->
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>2.1.0.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>${mysql-connector-java.version}</version>
            </dependency>
            <dependency>
                <groupId>org.mybatis.spring.boot</groupId>
                <artifactId>mybatis-spring-boot-starter</artifactId>
                <version>${mybatis-spring-boot.version}</version>
            </dependency>
            <dependency>
                <groupId>com.github.pagehelper</groupId>
                <artifactId>pagehelper-spring-boot-starter</artifactId>
                <version>1.2.4</version>
            </dependency>
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>${druid.version}</version>
            </dependency>

            <dependency>
                <groupId>com.squareup.okhttp3</groupId>
                <artifactId>okhttp</artifactId>
                <version>${okhttp.version}</version>
            </dependency>
            <dependency>
                <groupId>com.netflix.feign</groupId>
                <artifactId>feign-okhttp</artifactId>
                <version>${feign-okhttp.version}</version>
            </dependency>
            <dependency>
                <groupId>commons-io</groupId>
                <artifactId>commons-io</artifactId>
                <version>${commons-io.version}</version>
            </dependency>
            <dependency>
                <groupId>org.apache.commons</groupId>
                <artifactId>commons-io</artifactId>
                <version>${org.apache.commons.io.version}</version>
            </dependency>
            <dependency>
                <groupId>commons-fileupload</groupId>
                <artifactId>commons-fileupload</artifactId>
                <version>${commons-fileupload.version}</version>
            </dependency>
            <dependency>
                <groupId>commons-codec</groupId>
                <artifactId>commons-codec</artifactId>
                <version>${commons-codec.version}</version>
            </dependency>
            <dependency>
                <groupId>org.apache.commons</groupId>
                <artifactId>commons-lang3</artifactId>
                <version>${commons-lang3.version}</version>
            </dependency>
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>${lombok.version}</version>
            </dependency>
            <dependency>
                <groupId>io.springfox</groupId>
                <artifactId>springfox-swagger2</artifactId>
                <version>${springfox-swagger.version}</version>
            </dependency>
            <dependency>
                <groupId>io.springfox</groupId>
                <artifactId>springfox-swagger-ui</artifactId>
                <version>${springfox-swagger.version}</version>
            </dependency>
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>fastjson</artifactId>
                <version>${fastjson.version}</version>
            </dependency>
            <dependency>
                <groupId>net.oschina.zcx7878</groupId>
                <artifactId>fastdfs-client-java</artifactId>
                <version>${fastdfs-client-java.version}</version>
            </dependency>

            <dependency>
                <groupId>org.elasticsearch.client</groupId>
                <artifactId>elasticsearch-rest-high-level-client</artifactId>
                <version>${elasticsearch.version}</version>
            </dependency>
            <!-- https://mvnrepository.com/artifact/org.elasticsearch/elasticsearch -->
            <dependency>
                <groupId>org.elasticsearch</groupId>
                <artifactId>elasticsearch</artifactId>
                <version>${elasticsearch.version}</version>
            </dependency>
            <dependency>
                <groupId>com.google.guava</groupId>
                <artifactId>guava</artifactId>
                <version>${guava.version}</version>
            </dependency>

        </dependencies>
    </dependencyManagement>

2、resources下的页面模板

在resources下新建templates文件夹

并添加页面user.ftl

注意：文件夹名称templates不可改变，页面后缀.ftl不可改变。(在补充解释)

<html>
<head>
    <title>Welcome!</title>
</head>
<body>
<h1>Welcome ${user}!</h1>
<p>Our latest product:
    <a href="${latestProduct.url}">${latestProduct.name}</a>!
</body>
</html>

3、application.yml配置

server:
  port: 8888
spring:
  application:
    name: test-freemarker
  freemarker:
    charset: UTF-8
    #suffix:
    cache: false
    settings:
      template_update_delay: 0 #检查模板更新延迟时间，设置为 0 表示立即检查，如果时间大于 0 会有缓存不方便进行模板测试

4、controller层——TestFreemarker 

import com.lxw.pojo.Product;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;

import java.util.Map;

@Controller
public class TestFreemarker {

    @GetMapping
    public String test(Map map){
        map.put("user","李白");
        Product product = new Product();
        product.setUrl("http://www.baidu.com");
        product.setName("百度");
        map.put("latestProduct",product);
        return "user";
    }

}

 5、pojo层——Product 类

package com.lxw.pojo;


import lombok.Data;

@Data
public class Product {
    private String url;
    private String name;

}

6、启动类——TestFreemarkerApplication 

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class TestFreemarkerApplication {
    public static void main(String[] args) {
        SpringApplication.run(TestFreemarkerApplication.class,args);
    }

}

启动测试!

最后在启动类中启动测试，访问网址：http://localhost:8888/

补充：

resources下的文件夹和页面名后缀为什么不能随意更改呢？

上依赖文件源码！

 

springboot采用约定大于配置的原则，默认属性都在这里设置，现在明白了吧！

那么如何自定义呢？

问的好！ 

答：在application.yml配置文件中给对应属性赋值就会覆盖默认属性，以达到自定义的效果。

例如：修改页面文件的后缀名.ftl为.html，只需要给该属性赋值就好了

先在就可以 以.html结尾了。