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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

22、springboot集成freemarker