1. Create a new project springboot
You can see here https://blog.csdn.net/qq_43560721/article/details/104653470
2. Start writing simple helloWord
Create a new controller
package com.example.officialwebsite.controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class TestController{
@RequestMapping("/hello")
public String hello(){
return "hello word spring boot!";
}
}
Note startup class to add scanning package
package com.example.officialwebsite;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
@SpringBootApplication
@ComponentScan("com.example.officialwebsite.*")
public class OfficialwebsiteApplication {
public static void main(String[] args) {
SpringApplication.run(OfficialwebsiteApplication.class, args);
System.out.println("哈哈*=*");
}
}
3. Run Project
Enter the browser: HTTP: // localhost: 8888 / the Hello
+ = @Controller @ResponseBody @RestController
@RequestMapping: Request for Comments for address mapping process, can be used for class or method. Can also be written GetMapping, PostMapping, PutMapping, DeleteMapping, PatchMapping
@SpringBootApplication = (default property) @Configuration + @EnableAutoConfiguration + @ComponentScan.
@Configuration annotation identifies the class type may be used as a source Spring IoC container bean definition. @Bean annotation tells Spring, with a @Bean annotation method returns an object that should be registered as a bean in the Spring application context.
@EnableAutoConfiguration: can automatically configure context spring, trying to guess what you want and configure the bean class, usually automatically configured automatically based on your class path and your bean definitions.
@ComponentScan: automatically scans all designated under the package marked with @Component class and registered as bean, of course, including sub under @Component notes @ Service, @ Repository, @ Controller.
