SpringBoot第02天_使用Thymeleaf模板引擎回傳一個前後端整併模式的畫面_啟用靜態資源

啟用靜態資源
比方像是圖片、文件等等
這些主要會固定放置於static目錄下
可以自行去命名多一層目錄來分門別類



那也可以放一個html
這邊假設多創建一個test.html直接放於static目錄下

當運行時記得確認你上方挑選到的是
對應專案Application名稱

這邊要對應主程式類別運行喔





由此可見static這個目錄就相當於網站站台根目錄
針對靜態資源訪問情況

也可編寫img tag 連結靜態資源
而相對路徑也就一樣概念喔






如果要透過MVC框架來去做相應訪問

首先需要在pom.xml中添加spring-boot-starter-thymeleaf
或是一開始專案創建時候你就有挑選好



等專案產生成功後POM.xml中即可看到有自動添加此相依套件
pom.xml

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.7.13</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo2_themeleaf</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo2_themeleaf</name>
    <description>demo2_themeleaf</description>
    <properties>
        <java.version>11</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>



新增 TestThemeleafController.java 程式檔

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
package com.example.demo2_themeleaf;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;

@Controller
public class TestThemeleafController {
    @GetMapping("/home")
    public String test(){
        return "index";
    }

}

在resource目錄下的templates目錄中新增一個html檔案
Thymeleaf模板引擎會去找符合index字眼的html檔案來返回給client

index.html

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <h1>這是index首頁</h1>
</body>
</html>



Thymeleaf模板引擎常見語法
1.變數輸出
2.條件判斷
3.迴圈跌代遍歷
4.域物件
5.超連結語法



1.變數輸出
從後端傳值到前端html渲染



TestThemeleafController.java

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
package com.example.demo2_themeleaf;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;

@Controller
public class TestThemeleafController {
    @GetMapping("/home")
    public String test(Model model){
        model.addAttribute("message", "你好,thymeleaf");
        return "index";
    }

}


index.html

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <h1>這是index首頁</h1>
    <span th:text="${message}"></span>
</body>
</html>


2.條件判斷(th:if   跟  th:switch)

TestThemeleafController.java 新增demo2方法

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
package com.example.demo2_themeleaf;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class TestThemeleafController {
    @GetMapping("/home")
    public String test(Model model){
        model.addAttribute("message", "你好,thymeleaf");
        return "index";
    }

    @RequestMapping("/demo2")
    public String demo2(Model model) {
        model.addAttribute("gender", "女");
        model.addAttribute("grade", 3);
        return "demo2";
    }


}

demo2.html

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>demo2</title>
</head>
<body>
<h3>條件判斷</h3>
<div th:if="${gender} == '男'">
  是男性朋友
</div>
<div th:if="${gender} == '女'">
  是女性朋友
</div>
<br/>
<div th:switch="${grade}">
  <span th:case="1">這是1 的情况</span>
  <span th:case="2">這是2 的情况</span>
  <span th:case="3">這是3 的情况</span>
</div>
</body>
</html>

3.迴圈跌代遍歷

可以創建一個model目錄放置一個User  class


User.java

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
package model;

public class User {
    private Integer id;
    private String name;
    private Integer age;
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Integer getAge() {
        return age;
    }
    public void setAge(Integer age) {
        this.age = age;
    }
    public User() {
        super();
    }
    public User(Integer id, String name, Integer age) {
        super();
        this.id = id;
        this.name = name;
        this.age = age;
    }
}



TestThemeleafController.java 新增demo3方法

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
package com.example.demo2_themeleaf;

import model.User;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.ArrayList;
import java.util.List;

@Controller
public class TestThemeleafController {
    @GetMapping("/home")
    public String test(Model model){
        model.addAttribute("message", "你好,thymeleaf");
        return "index";
    }

    @RequestMapping("/demo2")
    public String demo2(Model model) {
        model.addAttribute("gender", "女");
        model.addAttribute("grade", 3);
        return "demo2";
    }

    @RequestMapping("/demo3")
    public String demo3(Model model){
        List<User> list = new ArrayList<User>();
        list.add(new User(1,"Eric",20));
        list.add(new User(2,"Jack",22));
        list.add(new User(3,"Rose",24));
        model.addAttribute("listModel",list);
        return "demo3";
    }

}

demo3.html

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
  <h3>列表資料陳列</h3>
  <table border="1">
    <tr>
      <td>編號</td>
      <td>姓名</td>
      <td>年齡</td>
    </tr>
    <tr th:each="user : ${listModel}">
      <td th:text="${user.id}"></td>
      <td th:text="${user.name}"></td>
      <td th:text="${user.age}"></td>
    </tr>
  </table>
</body>
</html>

4.域物件(request , session , application)

TestThemeleafController.java 新增demo4方法

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
package com.example.demo2_themeleaf;

import model.User;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpServletRequest;
import java.util.ArrayList;
import java.util.List;

@Controller
public class TestThemeleafController {
    @GetMapping("/home")
    public String test(Model model){
        model.addAttribute("message", "你好,thymeleaf");
        return "index";
    }

    @RequestMapping("/demo2")
    public String demo2(Model model) {
        model.addAttribute("gender", "女");
        model.addAttribute("grade", 3);
        return "demo2";
    }

    @RequestMapping("/demo3")
    public String demo3(Model model){
        List<User> list = new ArrayList<User>();
        list.add(new User(1,"Eric",20));
        list.add(new User(2,"Jack",22));
        list.add(new User(3,"Rose",24));
        model.addAttribute("listModel",list);
        return "demo3";
    }

    @RequestMapping("/demo4")
    public String demo4(HttpServletRequest request, Model model){
        //request
        request.setAttribute("request","request's data");

        //session
        request.getSession().setAttribute("session","session's data");

        //application
        request.getSession().getServletContext().setAttribute("application","application's data");
        return "demo4";
    }


}





demo4.html

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
  <h3>request,session,application資料獲取</h3>
  request:<span th:text="${#httpServletRequest.getAttribute('request')}"></span><br/>
  session:<span th:text="${session.session}"></span><br/>
  application:<span th:text="${application.application}"></span><br/>

</body>
</html>

5.超連結語法
編輯demo4.html
添加以下的連結區塊

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
  <h3>request,session,application資料獲取</h3>
  request:<span th:text="${#httpServletRequest.getAttribute('request')}"></span><br/>
  session:<span th:text="${session.session}"></span><br/>
  application:<span th:text="${application.application}"></span><br/>
  <h3>超連結</h3>
  <a th:href="@{~/demo2}">跳轉到demo2採用themeleaf</a><br/>
  <a th:href="@{~/demo2(id=1)}">跳轉到demo2採用themeleaf,帶單一參數版本</a><br/>
  <a th:href="@{~/demo2(id=1,name='Tom')}">跳轉到demo2採用themeleaf,帶多參數版本</a><br/>
</body>
</html>










留言

這個網誌中的熱門文章

何謂淨重(Net Weight)、皮重(Tare Weight)與毛重(Gross Weight)

Architecture(架構) 和 Framework(框架) 有何不同?_軟體設計前的事前規劃的藍圖概念

(2021年度)駕訓學科筆試準備題庫歸納分析_法規是非題