1. Directory structure

1.src/main/java: store Java code

2.src/main/resources

resources: (Spring Boot default) to store resource files
static: (Spring Boot default) to store static files, such as css, js, image, (access http://localhost:8080/js/main.js)
public: (Spring Boot default) to store public files
templates: (user-defined, you can name it arbitrarily, but the recognized file name is used here) to store static pages, such as jsp, html
config: (user-defined, you can name it anything you want, but the recognized file name is used here) to store configuration files, such as application.properties

2. Loading sequence of the same file, static resource file

Spring Boot from the default one by one META/resources > resources > static > publicto find whether there exist appropriate resources, if there is a direct return.

For example: Let's create a new js file in these folders, and see which file it will load?
Insert picture description here
Enter the following address in the address bar: http://localhost:8080/test.js, here we did not build the test.js file under the resources folder, so we will load the files under the static folder

Three, templates folder

Files in the templates folder need to be forwarded to be accessible

Because templates is not the Spring Boot default folder, we cannot access the files in this folder

1. To access, you need to introduce dependencies

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

2. Write a controller

@Controller
public class jumpController {
    
    
    @RequestMapping("/index")
    public String index() {
    
    
        return "index";
    }
}

3.Thymeleaf configuration file (configured in application.properties)

#####Thymeleaf配置文件
spring.thymeleaf.cache=false
spring.thymeleaf.mode=HTML
#编码
spring.thymeleaf.encoding=UTF-8
spring.thymeleaf.check-template=true
#类型
spring.thymeleaf.servlet.content-type=text/html
#前缀
spring.thymeleaf.prefix=classpath:/templates/
#后缀
spring.thymeleaf.suffix=.html

At this time, localhost:8080/indexyou can access index.html under templates

Four, define the loading order yourself or add your own new folder

Edit application.properties

spring.resources.static-locations = classpath:/META-INF/resources/,classpath:/resources/,classpath:/static/,classpath:/public/

Official website description:
https://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-developing-web-applications.html#boot-features-spring-mvc-static-content

Spring Boot | Spring Boot directory file structure detailed