Thymeleaf页面静态化技术

Teymeleaf的使用

案例一:springboot搭建Thymeleaf
1、导入依赖
2、新建html页面模板
3、新建前端控制层Controller
4、新建启动类

1、导入依赖

<?xml version="1.0" encoding="UTF-8"?>
<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>com.chawaner</groupId>
<artifactId>springboot-thymeleaf</artifactId>
<version>1.0-SNAPSHOT</version>
<description>Thymeleaf案例操作</description> <parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.4.RELEASE</version>
</parent> <dependencies>
<!--web起步依赖-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--thymeleaf配置-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
</dependencies>
</project>

2、新建模板:demo1.html

<!DOCTYPE html>
<!--引入Thymeleaf标签-->
<html xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>Thymeleaf模板引擎</title>
</head>
<body>
<!--
需要在指定的Thymeleaf的标签内,使用Thymeleaf语法
th:text="" 输出文本内容
-->
<div th:text="${message}"></div>
</body>
</html>

3、新建前端控制器:TestController

/**
* @Author TeaBowl
* @Date 2020/12/15 17:03
* @Version 1.0
* Thymeleaf模板引擎
*/
@Controller
@RequestMapping(value = "/test")
public class TestController { @GetMapping(value = "/hello")
public String hello(Model model){
model.addAttribute("message","hello Thymeleaf!");
return "demo1";
}
}

4、新建启动类:ThymeleafApplication

/**
* @Author TeaBowl
* @Date 2020/12/15 17:22
* @Version 1.0
*/
@SpringBootApplication
public class ThymeleafApplication { public static void main(String[] args) {
SpringApplication.run(ThymeleafApplication.class,args);
} }

5、测试

a.运行启动类ThymeleafApplication
b.打开浏览器:localhost:8080/test/hello
浏览器页面显示:hello Thymeleaf!
c.测试运行成功!

6、如何证明模板已经生效?

在浏览器显示页面上右键查看源码,

标签内部显示的是数据,而非模板语法
<!DOCTYPE html>
<!--引入Thymeleaf标签-->
<html>
<head>
<meta charset="UTF-8">
<title>Thymeleaf模板引擎</title>
</head>
<body>
<!--
需要在指定的Thymeleaf的标签内,使用Thymeleaf语法
th:text="" 输出文本内容
-->
<div>hello Thymeleaf!</div>
</body>
</html>

7、关闭缓存

创建application.yml

spring:
thymeleaf:
cache: false #模板缓存

8、thymeleaf基本语法

  1. 输出文本内容
<div th:text="${message}"></div>
  1. th:action 指定表单提交的路径
<div>
<form id="login-form" th:action="@{/test/hello}">
<button>提交</button>
</form>
</div>
  1. th:each循环标签

首先,创建一个User类

/**
* @Author TeaBowl
* @Date 2020/12/16 15:55
* @Version 1.0
*/
@Data //省略setter&getter
@NoArgsConstructor //无参构造
@AllArgsConstructor //全参构造
public class User {
private Integer id;
private String name;
private String address;
}

然后,在前端控制器TestController中创建List集合,添加数据并存入到Model;

/**
* @Author TeaBowl
* @Date 2020/12/15 17:03
* @Version 1.0
* Thymeleaf模板引擎
*/
@Controller
@RequestMapping(value = "/test")
public class TestController { @GetMapping(value = "/hello")
public String hello(Model model){
model.addAttribute("message","hello Thymeleaf!"); //创建一个List<User>,并将List<User>存入到Model中,到页面使用Thymeleaf标签显示
List<User> users = new ArrayList<>();
users.add(new User(1,"张三","深圳"));
users.add(new User(2,"李四","北京"));
users.add(new User(3,"王五","武汉"));
model.addAttribute("users",users); return "demo1";
}
}

最后,从前端页面取数据

<div>
th:each循环标签
<table>
<tr>
<td>编号</td>
<td>ID</td>
<td>NAME</td>
<td>ADDRESS</td>
</tr>
<!--
循环
user,userSta:${users}
user接收users对象
userSta当前循环对象的状态
-->
<tr th:each="user,userSta:${users}">
<td th:text="${userSta.count}"></td>
<td th:text="${user.id}"></td>
<td th:text="${user.name}"></td>
<td th:text="${user.address}"></td>
</tr>
</table>
</div>

9、Map输出

首先,在TestController中定义一个Map对象

/**
* @Author TeaBowl
* @Date 2020/12/15 17:03
* @Version 1.0
* Thymeleaf模板引擎
*/
@Controller
@RequestMapping(value = "/test")
public class TestController { @GetMapping(value = "/hello")
public String hello(Model model){
model.addAttribute("message","hello Thymeleaf!"); //创建一个List<User>,并将List<User>存入到Model中,到页面使用Thymeleaf标签显示
List<User> users = new ArrayList<>();
users.add(new User(1,"张三","深圳"));
users.add(new User(2,"李四","北京"));
users.add(new User(3,"王五","武汉"));
model.addAttribute("users",users); //Map定义,存入Model
Map<String,Object> dataMap = new HashMap<String,Object>();
dataMap.put("No","123");
dataMap.put("address","深圳");
model.addAttribute("dataMap",dataMap); return "demo1";
}
}

然后,从前端页面取数据

<div>
读取Map的两种方式<br>
1、知道Map的Key,直接根据Key获取数据<br>
3、不知道Map的Key,使用循环的方式获取Key,然后获取数<br>
<h3>方式一</h3>
<div>
获取Key=No的值:<span th:text="${dataMap.No}"></span><br>
获取Key=Address的值:<span th:text="${dataMap.Address}"></span>
</div>
<h3>方式二</h3>
<div th:each="m:${dataMap}">
<span th:text="${m.key}"></span>:<span th:text="${m.value}"></span>
</div>
</div>

10、Data日期输出

首先,在后台创建日期

/**
* @Author TeaBowl
* @Date 2020/12/15 17:03
* @Version 1.0
* Thymeleaf模板引擎
*/
@Controller
@RequestMapping(value = "/test")
public class TestController { @GetMapping(value = "/hello")
public String hello(Model model){
model.addAttribute("message","hello Thymeleaf!"); //创建一个List<User>,并将List<User>存入到Model中,到页面使用Thymeleaf标签显示
List<User> users = new ArrayList<>();
users.add(new User(1,"张三","深圳"));
users.add(new User(2,"李四","北京"));
users.add(new User(3,"王五","武汉"));
model.addAttribute("users",users); //Map定义,存入Model
Map<String,Object> dataMap = new HashMap<String,Object>();
dataMap.put("No","123");
dataMap.put("Address","深圳");
model.addAttribute("dataMap",dataMap); //创建日期,存入Model
model.addAttribute("Now",new Date()); return "demo1";
}
}

然后,从前端页面取数据

<div>
Data数据获取
format参数:对象,输出格式
<div>
<span th:text="${#dates.format(now,'yyyy-MM-dd HH:mm:ss')}"></span>
</div>
</div>

11、if条件

首先,在后台写数据,存入Model

//if条件,存入Model
model.addAttribute("age",22);

然后,在前端页面写条件判断

<div>
if条件判断,unless表示条件不成立时
<div>
<span th:if="${age>=18}">成年人</span>
<span th:unless="${age<18}">成年人</span>
</div>
</div>

12、th:fragment 定义一个模块

新建一个模块:footer.html

<!DOCTYPE html>
<html lang="en">
<!--引入Thymeleaf标签-->
<html xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>当作一个模块</title>
</head>
<body>
<!--定义一个模块,命名为copy-->
<div id="C" th:fragment="copy">
关于我们<br>
</div>
</body>
</html>

然后,把定义好的模块引入到前端页面

<div>
引入模块footer<br>
th:include="footer::copy"引入footer页面里的copy
<div>
<div id="A" th:include="footer::copy"></div>
</div>
</div>
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