Spring Boot static resources html - spring

Question

I created a spring starter project, but i can't access the static resource
Path
Application
package com.example.demo;
import org.glassfish.jersey.server.ResourceConfig;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
#SpringBootApplication
public class Application10_4 extends ResourceConfig{
public Application10_4(){
register(new BookService10_4());
}
public static void main(String[] args){
SpringApplication.run(Application10_4.class, args);
}
}
Dependencies in pom.xml
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jersey</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>
test
when I use the self-generated application I can access static resources
package com.example.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
#SpringBootApplication
public class Demo1Application {
public static void main(String[] args) {
SpringApplication.run(Demo1Application.class, args);
}
}

Answer 1

What is it register(new BookService10_4()); ?
Spring Boot will automatically add static web resources located within any of the following directories:
/META-INF/resources/
/resources/
/static/
/public/
So you can create a public/ directory under resources/ directory and put your static contents there. And they will be reached by: http://localhost:3000/koo.htm. (assuming the server.port is 3000)
You can customize these directories using spring.resources.static-locations in the application.properties.
You can continue read in https://spring.io/blog/2013/12/19/serving-static-web-content-with-spring-boot