22、springboot集成freemarker

springboot 中自带的页面渲染工具为thymeleaf ，freemarker这种模板引擎用的也比较多。

一、在spring中springMVC代表着view层组件

二、为什么使用freemarker：简单容易学、逻辑分明

三、freemarker优点：不依赖servlet、网络或者web环境

1、新建maven项目，对应的pom.xml文件如下

<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>spring-cloud</groupId>

<artifactId>sc-freemarker</artifactId>

<version>0.0.1-SNAPSHOT</version>

<packaging>jar</packaging>

 

<name>sc-freemarker</name>

<url>http://maven.apache.org</url>

 

<parent>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-parent</artifactId>

<version>2.0.4.RELEASE</version>

</parent>

 

<dependencyManagement>

<dependencies>

<dependency>

<groupId>org.springframework.cloud</groupId>

<artifactId>spring-cloud-dependencies</artifactId>

<version>Finchley.RELEASE</version>

<type>pom</type>

<scope>import</scope>

</dependency>

 

</dependencies>

</dependencyManagement>

 

<dependencies>

<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-web</artifactId>

</dependency>

 

<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-freemarker</artifactId>

</dependency>

</dependencies>

</project>

2、新建配置文件application.yml

server:

  port: 8081

  

 

spring:

  application:

    name: sc-freemarker

  freemarker:

    allow-request-override: false

    cache: true

    check-template-location: true

    charset: UTF-8

    content-type: text/html

    expose-request-attributes: false

    expose-session-attributes: false

    suffix: .ftl

    templateEncoding: UTF-8

    templateLoaderPath: classpath:/templates/

expose-spring-macro-helpers: false

备注：freemarker有哪些配置项可以参考类

org.springframework.boot.autoconfigure.freemarker.FreeMarkerProperties

3、新建一个controller

package sc.freemarker.controller;

 

import java.util.ArrayList;

import java.util.List;

 

import org.springframework.stereotype.Controller;

import org.springframework.ui.Model;

import org.springframework.web.bind.annotation.RequestMapping;

 

import sc.freemarker.model.User;

 

@Controller

public class FreemarkerController {

 

@RequestMapping("/getUser")

public String getUser(Integer id, Model model){

User u = new User();

u.setId(1);

u.setAge(13);

u.setSex(1);

u.setUserName("黄金");

User l = new User();

l.setId(1);

l.setAge(23);

l.setSex(0);

l.setUserName("白银");

List<User> friends = new ArrayList<User>();

friends.add(l);

u.setFriends(friends);

model.addAttribute("user",u);

return "getUser";

}

 

}

备注：注意最外层的控制层注解只能用@Controller

4、新建模板文件getUser.ftl

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml"

xmlns:th="http://www.thymeleaf.org"

xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity3">

<head>

<title>Hello World!</title>

</head>

<body>

<center>

<p>welcome ${user.userName} to freemarker!</p>

<p>

           年龄： ${user.age}</br>

性别：

<#if user.sex==0> 女 <#elseif user.sex==1> 男 <#else> 保密

</#if>

</p>

<h4>我的好友：</h4>

<#list user.friends as f> 姓名：${f.userName} , 年龄${f.age} <br>

</#list>

</center>

</body>

</html>

5、其他项目文件如下图

6、运行FreemarkerApplication.java类，启动项目；并检查启动信息，确认freemarker配置是否生效

7、访问页面http://127.0.0.1:8081/getUser