Thymeleaf系列一 Spring boot 集成Thymeleaf

谁践踏了优雅 2021-09-12 06:34 383阅读 0赞

## 1. 概念 ##

### 1.1 静态资源 ###

web的静态资源有 js、css、图片等  
Spring Boot默认提供静态资源目录位置：

*  classpath:/META-INF/resources/
 *  classpath:/resources/
 *  classpath:/static/
 *  classpath:/public/

定义在org.springframework.boot.autoconfigure.web.ResourceProperties类中：

@ConfigurationProperties(prefix = "spring.resources", ignoreUnknownFields = false)
    public class ResourceProperties implements ResourceLoaderAware { 
    
        private static final String[] SERVLET_RESOURCE_LOCATIONS = { "/" };
    
        private static final String[] CLASSPATH_RESOURCE_LOCATIONS = {
            "classpath:/META-INF/resources/", "classpath:/resources/",
            "classpath:/static/", "classpath:/public/" };
    
        private static final String[] RESOURCE_LOCATIONS;
    
        static {
            RESOURCE_LOCATIONS = new String[CLASSPATH_RESOURCE_LOCATIONS.length
                + SERVLET_RESOURCE_LOCATIONS.length];
            System.arraycopy(SERVLET_RESOURCE_LOCATIONS, 0, RESOURCE_LOCATIONS, 0,
                SERVLET_RESOURCE_LOCATIONS.length);
            System.arraycopy(CLASSPATH_RESOURCE_LOCATIONS, 0, RESOURCE_LOCATIONS,
                SERVLET_RESOURCE_LOCATIONS.length, CLASSPATH_RESOURCE_LOCATIONS.length);
        }
    
        /** * Locations of static resources. Defaults to classpath:[/META-INF/resources/, * /resources/, /static/, /public/] plus context:/ (the root of the servlet context). */
    private String[] staticLocations = RESOURCE_LOCATIONS;

### 1.2 模板引擎 ###

Thymeleaf是Spring Boot提供的默认配置的模板引擎之一。模板默认的模板配置路径为：src/main/resources/templates。

这个路径配置在org.springframework.boot.autoconfigure.thymeleaf.ThymeleafProperties 类中：

@ConfigurationProperties(prefix = "spring.thymeleaf")
    public class ThymeleafProperties { 
    
        private static final Charset DEFAULT_ENCODING = Charset.forName("UTF-8");
    
        private static final MimeType DEFAULT_CONTENT_TYPE = MimeType.valueOf("text/html");
    
        public static final String DEFAULT_PREFIX = "classpath:/templates/";
    
        public static final String DEFAULT_SUFFIX = ".html";
        /** * Prefix that gets prepended to view names when building a URL. */
        private String prefix = DEFAULT_PREFIX;

## 2. 第一个demo ##

*  POM.XML  
    配置依赖包

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

*  配置图片  
    测试图片的位置：src/main/resources/static/images/leaf.jpg
 *  首页模板页面  
    位置：src/main/resources/templates/simple/index.html
    
        <!DOCTYPE html>
            <html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org">
            <head lang="en">
                <meta charset="UTF-8" />
                <title></title>
            </head>
            <body>
            
            <img alt="test" th:src="@{images/leaf.jpg}" />
            <h1 th:text="${host}">Hello World</h1>
        </body>
 *  Java的Control类  
    输入/simple路径后台，转到index.html

@RequestMapping("/simple")
        public String simpleIndex(ModelMap map) {
            // 加入一个属性，用来在模板中读取
            map.addAttribute("host", "http://blog.csdn.net/hry2015/article/");
            // return模板文件的名称，对应src/main/resources/templates/index.html
            return "simple/index";  
        }

*  application.properties 关于thymeleaf配置

# Enable template caching. 开发时，设置此值为false
        spring.thymeleaf.cache=false 
        # Check that the templates location exists.
        spring.thymeleaf.check-template-location=true 
        # Content-Type value.
        spring.thymeleaf.content-type=text/html 
        # Enable MVC Thymeleaf view resolution.
        spring.thymeleaf.enabled=true 
        # Template encoding.
        spring.thymeleaf.encoding=UTF-8 
        # Comma-separated list of view names that should be excluded from resolution.
        spring.thymeleaf.excluded-view-names= 
        # Template mode to be applied to templates. See also StandardTemplateModeHandlers.
        spring.thymeleaf.mode=HTML5 
        # Prefix that gets prepended to view names when building a URL. 添加前缀到视图URL的前缀
        spring.thymeleaf.prefix=classpath:/templates/ 
        # Suffix that gets appended to view names when building a URL. 添加后缀到视图URL的后缀
        spring.thymeleaf.suffix=.html
        # Order of the template resolver in the chain. 
        # spring.thymeleaf.template-resolver-order=
        # Comma-separated list of view names that can be resolved.
        # spring.thymeleaf.view-names=

*  启动程序  
    输入[http://127.0.0.1:8080/simple][http_127.0.0.1_8080_simple]，转到到index.html

## 3. 代码 ##

[github][]

[http_127.0.0.1_8080_simple]: http://127.0.0.1:8080/simple
[github]: https://github.com/hryou0922/spring_boot/tree/master/thymeleaf/src/main/java/com/hry/spring/ctl