22、springboot集成freemarker

2024-03-15 11:50:53

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

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