1. What is Spring Boot
2. Advantages and disadvantages of Spring Boot
3. Quick Start
3.1. Set the parent of spring boot
<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.2.RELEASE</version> </parent>
Note: The Spring boot project must set the parent to the spring boot parent , which contains a large number of default configurations, which greatly simplifies our development.
3.2. Import the web support of spring boot
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency>
3.3. Add Spring boot plugin
<plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin>
3.4. Writing the first Spring Boot application
@Controller
@SpringBootApplication
@Configuration
public class HelloApplication {
@RequestMapping("hello")
@ResponseBody
public String hello(){
return "hello world！";
}
public static void main(String[] args) {
SpringApplication.run(HelloApplication.class, args);
}
}
Code description:
1. @SpringBootApplication : The core annotation of the Spring Boot project, the main purpose is to enable automatic configuration. ;
2. @Configuration : This is a configuration class that configures Spring ;
3. @Controller : Indicates that this is a SpringMVC Controller ;
4. main method: start an application in the main method , that is: the entry of this application;
3.5. Start the application
In a Spring Boot project, there are two ways to start, one is to run Java Application directly, and the other is to run through Spring Boot 's Maven plugin.
The first:
Start effect:
If you see the following information, the startup is successful:
INFO 6188 --- [ main] c.i.springboot.demo.HelloApplication : Started HelloApplication in 3.281 seconds (JVM running for 3.601)
3.6. Testing
Open a browser and enter the address:
Effect:
