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How Spring Boot integrates Thymeleaf

王林

May 16, 2023 am 09:22 AM

springbootthymeleaf

Thymeleaf

Basic introduction

Spring Boot officially recommends using Thymeleaf as its template engine. SpringBoot provides a series of default configurations for Thymeleaf and provides a view resolver for Thymeleaf. Once Thymeleaf's dependencies are imported into the project, the corresponding automatic configuration (ThymeleafAutoConfiguration) will automatically take effect, so Thymeleaf can be perfectly integrated with Spring Boot. Thymeleaf template engine can be perfectly combined with html tags to facilitate back-end rendering of data. Thymeleaf supports static effects and dynamic effects. When there is no dynamic data, static effects will be displayedThe template engine is produced to separate the user interface from business data (content). It can generate specific Format document, the template engine used for the website will generate a standard HTML documentIt is to use the template file and data to generate an HTML code through the template engine **Common template engines are: jsp, freemarker, velocity, thymeleafThymeleaf default The writing location is under the directory templates Thymeleaf official website: https://www.thymeleaf.org/

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>

The default view path of Thymeleaf is: / resources/templates, in this directory Create html below and introduce thymeleaf

<html lang="en" xmlns:th="http://www.thymleaf.org">

xmlns:th="http://www.thymleaf.org">

Basic Syntax

${domain Attribute name}: Get the domain attribute value in the request domain and display
${session.Domain attribute name}: Get the domain attribute value in the session domain and display

< p th:text="${name}">aaa</p>

If the data is obtained If so, it will be rendered into a dynamic picture, otherwise it will be rendered into a static picture (only the words student management system will be displayed)

How Spring Boot integrates Thymeleaf

th:text text Replacement

<span th:text="${user.name}">Tom</span>

th:if and th:unless text replacement

Use th:if and th:unless attributes for conditional judgment, th:unlessth:unless is just the opposite, only expressions The content will be displayed only if the conditions are not met

<h3 id="成年">=18}">成年</h3>
<h3 id="未成年">=18}">未成年</h3>

th:each foreach loop


<html lang="en" xmlns:th="http://www.thymleaf.org">

    
    Title
    


    学生管理系统
    
        
            
                序号
                姓名
                年龄
                性别
                班级
                生日
                操作
            
        
        
            
                1
                aa
                22
                男
                计科1班
                2022-2-3
                
                    删除

序号	姓名	年龄	性别	班级	生日	操作
1	aa	22	男	计科1班	2022-2-3	删除

How Spring Boot integrates Thymeleaf

th:href and @{} link expression

<!--http://localhost:8080/stu/10 -->
<a th:href="${&#39;/stus/&#39;+ stu.id}" rel="external nofollow" >编辑学生1</a>

<!--http://localhost:8080/stu?id=10 -->
<a th:href="@{/stus(id=${stu.id})}" rel="external nofollow" >编辑学生2</a>

<!--http://localhost:8080/stu?id=10&name=abc -->
<a th:href="@{/stus(id=${stu.id},name=${stu.name})}" rel="external nofollow" >编辑学生3</a>

th:switch and th:case

<div th:switch="${stu.role}">
  <h3 id="班长">班长</h3>
  <h3 id="团支书">团支书</h3>
  <h3 id="学委">学委</h3>
  <h3 id="其他">其他</h3>
  
</div>

thymeleaf defaults to the status of the variable name Stat

If the status variable is not set explicitly, thymeleaf will default to the status of a variable name Stat

<tr th:each="stu: ${stus}">
  <td th:text="${stuStat.index}"></td>
  <td th:text="${ stu.name}"></td>
  <td th:text="${ stu.age}"></td>    
</tr>

th:object can define object attributes
*{}can be used in conjunction with th:object to extract the attributes in the object
#dates.format() can be used to format date format

 <form th:object="${stu}">
        编号:<input type="text" name="id" th:value="*{id}"><br>
        姓名:<input type="text" name="name" th:value="*{name}"><br>
        年龄:<input type="text" name="age" th:value="*{age}"><br>
        性别:<input type="radio" name="gender" value="true" th:checked="*{gender}">男<br>
        性别:<input type="radio" name="gender" value="true" th:checked="*{not gender}">女<br>
        生日:<input type="text" name="birth" th:value="*{#dates.format(birth,&#39;yyyy-MM-dd&#39;)}"><br>
        <input type="submit" value="编辑">
    </form>

Integrate Thymeleaf

Basic configuration

When creating a project, remember Check Thymeleaf in the template engine

How Spring Boot integrates Thymeleaf

Delete the MySQL driver scope in pom.xml
Then we use the druid connection pool here, so we need Import related dependencies in the pom file

 <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.2.11</version>
        </dependency>

Then we need to make relevant configurations in the global configuration file application.properties

# 指定Mybatis的Mapper接口的xml映射文件的路径
mybatis.mapper-locations=classpath:mapper/*xml
# MySQL数据库驱动
#这个驱动也可以省略，可以根据使用的MySQL自动加载相应的驱动
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
# 数据源名称
spring.datasource.name=com.alibaba.druid.pool.DruidDataSource
# 数据库连接地址
spring.datasource.url=jdbc:mysql://localhost:3306/school?serverTimezone=UTC&zeroDateTimeBehavior=convertToNull
# 数据库用户名和密码
spring.datasource.username=root
spring.datasource.password=a87684009.
# 设置日志级别
logging.level.com.zyh.springboot=debug
# 开启mybatis驼峰命名规则自动转换功能
mybatis.configuration.map-underscore-to-camel-case=true

Database preparation Prepare the database tables corresponding to Entity classes, and three-tier structure

How Spring Boot integrates Thymeleaf

How Spring Boot integrates Thymeleaf ##

@Data
public class Stu {
    private Integer id;
    private String name;
    private Integer age;
    private Boolean gender;
    private Integer cid;
    @DateTimeFormat(pattern = "yyyy-MM-dd")
    private Date birth;
}

Three-tier architecture

Mapper

@Mapper
public interface StuMapper {
    /**
     * 查询所有学生信息
     * @return
     * @throws Exception
     */
    @Select("select * from stu")
     List<Stu> queryAllStu() throws Exception;
}

Service

public interface StuService  {
    /**
     * 查询所有学生信息
     * @return
     */
    List<Stu> queryAllStu() throws Exception;
}

Service implementation class

@Service
public class StuServiceImpl implements StuService {
    @Autowired
    private StuMapper stuMapper;
    @Override
    public List<Stu> queryAllStu() throws Exception {
         return stuMapper.queryAllStu();
    }
}

thymeleaf


<html lang="en" xmlns:th="http://www.thymleaf.org">
  
    
    Title
  
  
    学生管理系统
    aaaa

Controller

@Controller
@RequestMapping("/stu")
public class StuController {
    @Autowired
    private StuService stuService;
    /**
    * 显示学生管理系统的画面
    * @return
    */
    @RequestMapping("/stusUi")
    public String stusUi(){
        return "stus";
    }
}

How Spring Boot integrates Thymeleaf

How Spring Boot integrates Thymeleaf ##Then let’s prepare the page first

<!DOCTYPE html>
<html lang="en"  xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .tb-stus{
            width: 900px;
            margin: 0 auto;
            border: black 1px solid;
            border-collapse: collapse;
        }
        .tb-stus th,td{
            padding: 10px;
            text-align: center;
            border:1px solid black;
        }
    </style>
</head>
<body>
<h3 id="学生管理系统">学生管理系统</h3>
<table class="tb-stus">
    <thead>
    <tr>
        <th>序号</th>
        <th>姓名</th>
        <th>年龄</th>
        <th>性别</th>
        <th>班级</th>
        <th>生日</th>
        <th>操作</th>
    </tr>
    </thead>
    <tbody>
    <tr th:each="stu,status: ${stuList}">
        <td th:text="${status.index+1}">1</td>
        <td th:text="${stu.name}">aa</td>
        <td th:text="${stu.age}">22</td>
<!--        gender的属性值为1表示性别为男-->
        <td th:if="${stu.gender}">男</td>
        <td th:unless="${stu.gender}">女</td>
        <td th:text="${stu.cid}">计科1班</td>
       <td th:text="${#dates.format(stu.birth,&#39;yyyy-MM-dd&#39;)}">2022-2-3</td>
        <td>
            <!--http://localhost:8080/stu/delete?id=10-->
            <a th:href="@{/stu/delete(id=${stu.id})}" rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >删除</a>
        </td>
    </tr>
    </tbody>
</table>
</body>
</html>

How Spring Boot integrates Thymeleaf When we click delete, the backend must delete the corresponding data from the database based on the id passed by the frontend. Here we will first complete it according to the familiar method when we learned it before. Later, we will talk about the front-end and back-end separation development in detail

Delete operation

Controller (the previous method is not pasted here Come out, otherwise there will be too much code)

@Controller
@RequestMapping("/stu")
public class StuController {
    @Autowired
    private StuService stuService;
   
    /**根据id删除数据
     * http://localhost:8080/stu/delete?id=10
     * @return
     */
    @RequestMapping("/delete")
    public String deleteById(@RequestParam("id") Integer id){
        try {
            stuService.deleteByid(id);
        } catch (Exception e) {
            e.printStackTrace();
        }
        System.out.println(id);
        return "redirect:/stu/stusUi";
    }


  }

Service

public interface StuService  {
    /**
     * 查询所有学生信息
     * @return
     */
    List<Stu> queryAllStu() throws Exception;

    void deleteByid(Integer id);
}

Service implementation class

@Service
public class StuServiceImpl implements StuService {
    @Autowired
    private StuMapper stuMapper;
    @Override
    public List<Stu> queryAllStu() throws Exception {
         return stuMapper.queryAllStu();
    }

    /**
     * 根据id删除数据
     * @param id
     */
    @Override
    public void deleteByid(Integer id) throws Exception {
        stuMapper.deleteById(id);
    }
}

Mapper

@Mapper
public interface StuMapper {
    /**
     * 查询所有学生信息
     * @return
     * @throws Exception
     */
    @Select("select * from stu")
     List<Stu> queryAllStu() throws Exception;
    @Delete("delete from stu where id=#{id}")
    void deleteById( Integer id);
}

Delete the data numbered 8

How Spring Boot integrates Thymeleaf

编辑操作

页面stus.html

<!DOCTYPE html>
<html lang="en"  xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .tb-stus{
            width: 900px;
            margin: 0 auto;
            border: black 1px solid;
            border-collapse: collapse;
        }
        .tb-stus th,td{
            padding: 10px;
            text-align: center;
            border:1px solid black;
        }
    </style>
</head>
<body>
<h3 id="学生管理系统">学生管理系统</h3>
<table class="tb-stus">
    <thead>
    <tr>
        <th>序号</th>
        <th>姓名</th>
        <th>年龄</th>
        <th>性别</th>
        <th>班级</th>
        <th>生日</th>
        <th>操作</th>
    </tr>
    </thead>
    <tbody>
    <tr th:each="stu,status: ${stuList}">
        <td th:text="${stu.id}">1</td>
        <td th:text="${stu.name}">aa</td>
        <td th:text="${stu.age}">22</td>
<!--        gender的属性值为1表示性别为男-->
        <td th:if="${stu.gender}">男</td>
        <td th:unless="${stu.gender}">女</td>
        <td th:text="${stu.cid}">计科1班</td>
         <td th:text="${#dates.format(stu.birth,&#39;yyyy-MM-dd&#39;)}">2022-2-3</td>
        <td>
<!--            localhost:8080/stu/delete/8-->
<!--            <a th:href="${&#39;/stu/delete/&#39;+stu.id}" rel="external nofollow"  rel="external nofollow" >删除</a>-->
            <!--http://localhost:8080/stu/delete?id=10-->
            <a th:href="@{/stu/delete(id=${stu.id})}" rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >删除</a>
            <a th:href="@{/stu/edit(id=${stu.id})}" rel="external nofollow"  rel="external nofollow" >编辑</a>
        </td>
    </tr>
    </tbody>
</table>

</body>
</html>

页面 stu-edit.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
  <head>
    <meta charset="UTF-8">
    <title>编辑画面</title>
  </head>
  <body>
    <h3 id="编辑学生信息">编辑学生信息</h3>
    <form action="" method="post" th:object="${stu}">
      学号:<input type="text" name="id" th:value="*{id}"  ><br><br>
      姓名:<input type="text" name="name"  th:value="*{name}"><br><br>
      年龄:<input type="text" name="age"  th:value="*{age}"><br><br>
      性别:<input type="radio" name="gender"    th:checked="*{gender}"  >男
      <input type="radio" name="gender"   th:checked="*{!gender}" >女<br><br>
      班级:<input type="text" name="cid" th:value="*{cid}"><br><br>
      生日:<input type="text" name="birth" th:value="*{#dates.format(birth,&#39;yyyy-MM-dd&#39;)}"><br><br>
      <input type="submit" value="编辑">
    </form>
  </body>
</html>

Controller

/**
     * 根据id来修改数据
     * 我们首先得先根据id把数据查询出来，然后把数据展示出来
     * 用户再进行编辑，用户编辑完并且提交以后，跳转到学生管理系统画面，展示所有数据
     * @return
     */
    @RequestMapping("/edit")
    public String edit(@RequestParam("id") Integer id,Model model){
        System.out.println("id"+id);
        try {
            Stu stu=stuService.queryById(id);
            model.addAttribute("stu",stu);
        } catch (Exception e) {
            e.printStackTrace();
        }

        return "stu-edit";
    }

Service

public interface StuService  {
    /**
     * 查询所有学生信息
     * @return
     */
    List<Stu> queryAllStu() throws Exception;

    /**
     * 根据id来删除学生信息
     * @param id
     * @throws Exception
     */
    void deleteByid(Integer id) throws Exception;

    /**
     * 根据id来查询对应学生信息
     * @param id
     * @return
     * @throws Exception
     */
    Stu queryById(Integer id) throws Exception;
}

Service实现类

@Service
public class StuServiceImpl implements StuService {
    @Autowired
    private StuMapper stuMapper;
    @Override
    public List<Stu> queryAllStu() throws Exception {
         return stuMapper.queryAllStu();
    }

    /**
     * 根据id删除数据
     * @param id
     */
    @Override
    public void deleteByid(Integer id) throws Exception {
        stuMapper.deleteById(id);
    }

    @Override
    public Stu queryById(Integer id) throws Exception {
        return stuMapper.queryById(id);
    }
}

Mapper

@Mapper
public interface StuMapper {
    /**
    * 查询所有学生信息
    * @return
    * @throws Exception
    */
    @Select("select * from stu")
    List<Stu> queryAllStu() throws Exception;
    @Delete("delete from stu where id=#{id}")
    void deleteById( Integer id);
    @Select("select * from stu where id=#{id}")
    Stu queryById(Integer id) throws Exception;
}

How Spring Boot integrates Thymeleaf

比如在序号为4中，点击编辑

How Spring Boot integrates Thymeleaf

用户登录

登录页面：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <h3 id="用户登录">用户登录</h3>
    <form action="/login" method="post">
        账号:<input type="text" name="username"><br><br>
        密码:<input type="password" name="password"><br><br>
        <input type="submit" value="登录">
    </form>


</body>
</html>

因为需要判断用户是否存在，这是从数据库进行查询的，所以要准备对应的管理员表

# 创建管理员表
CREATE TABLE admin(
	id INT PRIMARY KEY AUTO_INCREMENT,
	username VARCHAR(20),
	`password` VARCHAR(20)
); 

INSERT INTO admin VALUES
	(DEFAULT,&#39;aaa&#39;,111),
	(DEFAULT,&#39;bbb&#39;,222),
	(DEFAULT,&#39;ccc&#39;,333);
# 查询测试
SELECT * FROM admin;

准备对应的实体类

@Data
public class Admin {
    private String username;
    private String password;
}

Controller

@Controller
@SessionAttributes(names = {"admin"})
public class AdminController {
    @Autowired
    private AdminService adminService;

    /**
     * 显示登录页面
     * @return
     */
    @RequestMapping(value = "/loginUi")
    public String loginUi(){
        return "login";
    }
    @RequestMapping(value = "/login",method = RequestMethod.POST)
    public String login(String username, String password, Model model){
        try {
            Admin admin = adminService.login(username, password);
            //用户名存在说明登录成功
            if (admin!=null){
                //存放到session域中
                model.addAttribute("admin",admin);
                return "redirect:/stu/stusUi";
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "redirect:/loginUi";
    }

}

Service

public interface AdminService {
    Admin login(String username,String password) throws Exception;
}

Service对应的实现类

@Service
public class AdminServiceImpl implements AdminService {
    @Autowired
    private AdminMapper adminMapper;
    @Override
    public Admin login(String username, String password) throws Exception {
        return adminMapper.queryByUsernameAndPassword(username,password);
    }
}

Mapper

@Mapper
public interface AdminMapper {
    @Select("select * from admin where username=#{username} and password=#{password}")
    Admin queryByUsernameAndPassword(@Param("username") String username, @Param("password") String password);
}

How Spring Boot integrates Thymeleaf

<!DOCTYPE html>
<html lang="en"  xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .tb-stus{
            width: 900px;
            margin: 0 auto;
            border: black 1px solid;
            border-collapse: collapse;
        }
        .tb-stus th,td{
            padding: 10px;
            text-align: center;
            border:1px solid black;
        }
    </style>
</head>
<body>
    <h3 id="学生管理系统">学生管理系统</h3>
    <h3 id="用户名">用户名</h3>
    <a th:unless="${session.admin!=null}" href="/loginUi" rel="external nofollow" >登录</a>
    <a th:if="${session.admin!=null}" href="/logout" rel="external nofollow" >注销用户</a>
<table class="tb-stus">
    <thead>
    <tr>
        <th>序号</th>
        <th>姓名</th>
        <th>年龄</th>
        <th>性别</th>
        <th>班级</th>
        <th>生日</th>
        <th>操作</th>
    </tr>
    </thead>
    <tbody>
    <tr th:each="stu,status: ${stuList}">
        <td th:text="${stu.id}">1</td>
        <td th:text="${stu.name}">aa</td>
        <td th:text="${stu.age}">22</td>
<!--        gender的属性值为1表示性别为男-->
        <td th:if="${stu.gender}">男</td>
        <td th:unless="${stu.gender}">女</td>
        <td th:text="${stu.cid}">计科1班</td>
        <td th:text="${#dates.format(stu.birth,&#39;yyyy-MM-dd&#39;)}">2022-2-3</td>
        <td>
<!--            localhost:8080/stu/delete/8-->
<!--            <a th:href="${&#39;/stu/delete/&#39;+stu.id}" rel="external nofollow"  rel="external nofollow" >删除</a>-->
            <!--http://localhost:8080/stu/delete?id=10-->
            <a th:href="@{/stu/delete(id=${stu.id})}" rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >删除</a>
            <a th:href="@{/stu/edit(id=${stu.id})}" rel="external nofollow"  rel="external nofollow" >编辑</a>
        </td>
    </tr>
    </tbody>
</table>

</body>
</html>

How Spring Boot integrates Thymeleaf

用户注销

注销的话，我们把session域中的用户对象取消，然后这个时候就得重新登录，应该要跳转到登录画面

@RequestMapping("/logout")
    public String logout(HttpSession session){
        session.removeAttribute("admin");
        return "redirect:/loginUi";
    }

How Spring Boot integrates Thymeleaf

点击注销用户

How Spring Boot integrates Thymeleaf

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