Spring Boot 集成 FreeMarker 詳解案例(十五)

1、Springboot 那些事

SpringBoot 很方便的集成 FreeMarker ,DAO 數據庫操做層依舊用的是 Mybatis,本文將會一步一步到來如何集成 FreeMarker 以及配置的詳解:
Springboot 那些事:
系類文章:

2、運行 springboot-freemarker 工程

git clone 下載工程 springboot-learning-example ,項目地址見 GitHubhttps://github.com/JeffLi1993/springboot-learning-example。下面開始運行工程步驟(Quick Start):
1.數據庫準備

a.建立數據庫 springbootdb:html

1
CREATE DATABASE springbootdb;
b.建立表 city :(由於我喜歡徒步)
1
2
3
4
5
6
7
8
DROP TABLE IF EXISTS  `city`;
CREATE TABLE `city` (
   ` id ` int(10) unsigned NOT NULL AUTO_INCREMENT COMMENT '城市編號' ,
   `province_id` int(10) unsigned  NOT NULL COMMENT '省份編號' ,
   `city_name` varchar(25) DEFAULT NULL COMMENT '城市名稱' ,
   `description` varchar(25) DEFAULT NULL COMMENT '描述' ,
   PRIMARY KEY (` id `)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

c.插入數據java

1
INSERT city VALUES (1 ,1, '溫嶺市' , 'BYSocket 的家在溫嶺。' );
2. 項目結構介紹
項目結構以下圖所示:
org.spring.springboot.controller - Controller 層
org.spring.springboot.dao - 數據操做層 DAO
org.spring.springboot.domain - 實體類
org.spring.springboot.service - 業務邏輯層
Application - 應用啓動類
resources/application.properties - 應用配置文件,應用啓動會自動讀取配置
resources/web - *.ftl文件,是 FreeMarker 文件配置路徑。在 application.properties 配置
resources/mapper - DAO Maper XML 文件
3.改數據庫配置
打開 application.properties 文件, 修改相應的數據源配置,好比數據源地址、帳號、密碼等。(若是不是用 MySQL,pom 自行添加鏈接驅動依賴,而後修改驅動名配置。)
4.編譯工程
在項目根目錄 springboot-learning-example,運行 maven 指令:
mvn clean install
5.運行工程
右鍵運行 springboot-freemarker 工程 Application 應用啓動類的 main 函數,而後在瀏覽器訪問:
獲取 ID 編號爲 1 的城市信息頁面:
1
localhost:8080 /api/city/1
獲取城市列表頁面:
1
localhost:8080 /api/city
6.補充
運行環境:JDK 7 或 8,Maven 3.0+
技術棧:SpringBoot、Mybatis、FreeMarker

3、 springboot-freemarker 工程配置詳解

1.pom.xml 依賴

pom.xml 代碼以下:mysql

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
53
54
55
56
57
58
59
60
61
62
63
64
<? 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 >springboot</ groupId >
    < artifactId >springboot-freemarker</ artifactId >
    < version >0.0.1-SNAPSHOT</ version >
    < name >springboot-freemarker :: Spring Boot 集成 FreeMarker 案例</ name >
 
    <!-- Spring Boot 啓動父依賴 -->
    < parent >
        < groupId >org.springframework.boot</ groupId >
        < artifactId >spring-boot-starter-parent</ artifactId >
        < version >1.5.1.RELEASE</ version >
    </ parent >
 
    < properties >
        < mybatis-spring-boot >1.2.0</ mybatis-spring-boot >
        < mysql-connector >5.1.39</ mysql-connector >
    </ properties >
 
    < dependencies >
        <!-- Spring Boot Freemarker 依賴 -->
        < dependency >
            < groupId >org.springframework.boot</ groupId >
            < artifactId >spring-boot-starter-freemarker</ artifactId >
        </ dependency >
 
        <!-- Spring Boot Web 依賴 -->
        < dependency >
            < groupId >org.springframework.boot</ groupId >
            < artifactId >spring-boot-starter-web</ artifactId >
        </ dependency >
 
        <!-- Spring Boot Test 依賴 -->
        < dependency >
            < groupId >org.springframework.boot</ groupId >
            < artifactId >spring-boot-starter-test</ artifactId >
            < scope >test</ scope >
        </ dependency >
 
        <!-- Spring Boot Mybatis 依賴 -->
        < dependency >
            < groupId >org.mybatis.spring.boot</ groupId >
            < artifactId >mybatis-spring-boot-starter</ artifactId >
            < version >${mybatis-spring-boot}</ version >
        </ dependency >
 
        <!-- MySQL 鏈接驅動依賴 -->
        < dependency >
            < groupId >mysql</ groupId >
            < artifactId >mysql-connector-java</ artifactId >
            < version >${mysql-connector}</ version >
        </ dependency >
 
        <!-- Junit -->
        < dependency >
            < groupId >junit</ groupId >
            < artifactId >junit</ artifactId >
            < version >4.12</ version >
        </ dependency >
    </ dependencies >
</ project >
在 pom.xml 依賴中增長 Spring Boot FreeMarker 依賴。
2.配置 FreeMarker

而後在 application.properties 中加入 FreeMarker 相關的配置:git

1
2
3
4
5
6
7
8
9
10
11
## Freemarker 配置
## 文件配置路徑
spring.freemarker.template-loader-path=classpath: /web/
spring.freemarker.cache= false
spring.freemarker.charset=UTF-8
spring.freemarker.check-template-location= true
spring.freemarker.content- type =text /html
spring.freemarker.expose-request-attributes= true
spring.freemarker.expose-session-attributes= true
spring.freemarker.request-context-attribute=request
spring.freemarker.suffix=.ftl
這是我這塊的配置,若是須要更多的 FreeMarker 配置,能夠查看下面的詳解:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
spring.freemarker.allow-request-override= false # Set whether HttpServletRequest attributes are allowed to override (hide) controller generated model attributes of the same name.
spring.freemarker.allow-session-override= false # Set whether HttpSession attributes are allowed to override (hide) controller generated model attributes of the same name.
spring.freemarker.cache= false # Enable template caching.
spring.freemarker.charset=UTF-8 # Template encoding.
spring.freemarker.check-template-location= true # Check that the templates location exists.
spring.freemarker.content- type =text /html # Content-Type value.
spring.freemarker.enabled= true # Enable MVC view resolution for this technology.
spring.freemarker.expose-request-attributes= false # Set whether all request attributes should be added to the model prior to merging with the template.
spring.freemarker.expose-session-attributes= false # Set whether all HttpSession attributes should be added to the model prior to merging with the template.
spring.freemarker.expose-spring-macro-helpers= true # Set whether to expose a RequestContext for use by Spring's macro library, under the name "springMacroRequestContext".
spring.freemarker.prefer- file -system-access= true # Prefer file system access for template loading. File system access enables hot detection of template changes.
spring.freemarker.prefix= # Prefix that gets prepended to view names when building a URL.
spring.freemarker.request-context-attribute= # Name of the RequestContext attribute for all views.
spring.freemarker.settings.*= # Well-known FreeMarker keys which will be passed to FreeMarker's Configuration.
spring.freemarker.suffix= # Suffix that gets appended to view names when building a URL.
spring.freemarker.template-loader-path=classpath: /templates/ # Comma-separated list of template paths.
spring.freemarker.view-names= # White list of view names that can be resolved.
3.展現層 Controller 詳解
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
/**
  * 城市 Controller 實現 Restful HTTP 服務
  * <p>
  * Created by bysocket on 07/02/2017.
  */
@Controller
public class CityController {
 
    @Autowired
    private CityService cityService;
 
    @RequestMapping (value = "/api/city/{id}" , method = RequestMethod.GET)
    public String findOneCity(Model model, @PathVariable ( "id" ) Long id) {
        model.addAttribute( "city" , cityService.findCityById(id));
        return "city" ;
    }
 
    @RequestMapping (value = "/api/city" , method = RequestMethod.GET)
    public String findAllCity(Model model) {
        List<City> cityList = cityService.findAllCity();
        model.addAttribute( "cityList" ,cityList);
        return "cityList" ;
    }
}
a.這裏不是走 HTTP + JSON 模式,使用了 @Controller 而不是先前的 @RestController
b.方法返回值是 String 類型,和 application.properties 配置的 Freemarker 文件配置路徑下的各個 *.ftl 文件名一致。這樣纔會準確地把數據渲染到 ftl 文件裏面進行展現。
c.用 Model 類,向 Model 加入數據,並指定在該數據在 Freemarker 取值指定的名稱。

4、小結

FreeMarker 是經常使用的模板引擎,不少開發 Web 的必選。
推薦閱讀《 Springboot 那些事
相關文章
相關標籤/搜索