First, what is SprigBoot, what's the use?
It is a micro-services: a project can be (micro service) constituted by a plurality of small service
role: Boot spring can quickly develop micro service module
. A simplified j2ee development
. B integration of the entire spring stack technology (integrated spring SpringMVC)
. C throughout j2ee integration technology (integrated mybatis redis)
Two, SpringBoot directory structure and the role:
Here I created a maven type of springboot
Directory Structure
Resources:
static: static resources (js css Image Audio Video)
Templates: template file (template engine freemarker, thymeleaf; default does not support JSP)
application.properties: Profile
Third, the service class notes role:
package org.skh.spring.HelloSpringBoot;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class HelloSpringBootApplication {
public static void main(String[] args) {
SpringApplication.run(HelloSpringBootApplication.class, args);
}
}
Once up and running it as a javaapplication, equivalent turned on the server, it can access your requestMapping and other static resources by the browser localhost + port. This class inside annotation @SpringBootApplication can be described as critical.
@SpringBootApplication also contains a number of comments, I say something which is particularly important for two reasons:
i：@SpringBootConfiguration：
He also included a note called the @Configuration, its role is to have the @Configuration annotated classes to join the Spring container, Spring is not here to explain what the container. Also declares that this class is a class configuration.
ii:@EnableAutoConfiguration:
1. We know that when we need to use SpringMvc annotated package is scanned, such as Controller, but we need to be hard-coded configuration, this role is to comment @SpringBootApplication bags annotations and where sub-scanning package is added. It belongs to our hand-code configuration.
2. reliance on third parties (jar) to configure:
With this comment after, spring boot at startup, will find the corresponding three-way dependence according to META-INF / spring.factories, and these depend on the introduction of the project
Summary:
When writing the project, the general will write their own code and configure the three parties rely on. But spring boot can be configured to automatically:
A: write your own code, spring boot configuration by automatically help us @SPringBootApplication in @SpringBootConfiguration;
b tripartite reliance by spring-boot-autoconfigure-2.0.3.RELEASE.jar in.
The META -INF / spring.factories declared, then turn use by @SpringBootApplication in @EnableAutoConfiguration.
tips: spring-boot-autoconfigure- 2.0.3.RELEASE.jar package contains system-dependent J2EE integration required.