资源

入门文档
https://spring.io/guides
https://spring.io/quickstart

API 文档
https://docs.spring.io/spring/docs/current/

视频教程 @网易云课堂 https://study.163.com/course/courseMain.htm?courseId=1004475015
视频教程 @尚硅谷 https://www.bilibili.com/video/BV1Et411Y7tQ

一些博客教程
Spring系列教程 https://github.com/wuyouzhuguli/SpringAll
一步到位springboot https://blog.csdn.net/chaitoudaren/article/details/105624082
老实人spring源码解析 https://blog.csdn.net/chaitoudaren/article/details/104833634

关于官方文档
这里是一些小项目类型的入门教程

这里是各个部分详细的教程和文档

试玩

https://spring.io/guides/gs/rest-service/

For all Spring applications, you should start with the Spring Initializr.
The Initializr offers a fast way to pull in all the dependencies you need for an application and does a lot of the setup for you.

If you use Gradle, you can run the application by using ./gradlew bootRun
Alternatively, you can build the JAR file by using ./gradlew build and then run the JAR file, as follows:

java -jar build/libs/gs-rest-service-0.1.0.jar

If you use Maven, you can run the application by using ./mvnw spring-boot:run
Alternatively, you can build the JAR file with ./mvnw clean package and then run the JAR file, as follows:

java -jar target/gs-rest-service-0.1.0.jar

springboot的项目往往以xxxx-starter命名，springboot之所以受欢迎便是因为其约定大于配置的思想，默认的帮我们做了很多事情
引入一个spring-boot-starter-web，实际上springboot就帮我们引入了spring-web、mvc、tomcat等等包

SpringBoot 有许多默认配置, 可以在 /src/main/java/resources/application.properties 中添加自定义配置
或者可以用 yml 格式, 文件改成 application.yml
springboot默认读取的是application.yml，我们需要在application.yml中指定当前生效的配置文件

spring:
  profiles:
    active: dev

springboot会按照约定寻找application-*.yml文件
springboot的配置文件可以在以下 5 处，按照优先级从高到低的顺序为:

启动命令时指定目录，也就是java -jar xxx强制指定的
当前项目同级目录下/config中，也就是../config/application.yml
当前项目同级目录，也就是../application.yml
项目内config包中，也就是src/main/resources/config/application.yml
项目内，也就是src/main/resources/application.yml

概念

https://www.w3cschool.cn/wkspring/dcu91icn.html

The @RestController and @RequestMapping annotations are Spring MVC annotations (they are not specific to Spring Boot). See the MVC section in the Spring Reference Documentation for more details.

IOC

将对象的创建交给Spring框架处理
两种方式

配置文件
注解

XML
dom4j
工厂模式
反射

<bean id="userService" class="com.example.UserService" />

# Spring 内容帮创建对象的大致的过程
String className = "xxx"; // dom4j 从 xml 中解析处理
Class aClass = Class.formName(className);
UserService service = aClass.newInstance();

在测试中使用

Annotation

@Component

@Component is a Spring bean and a Singleton.
If the class belongs to the service layer you may want to annotate it with @Service instead
But have in mind that in order for these annotations to be detected, you need to place this line in applicationContext.xml:

<context:component-scan base-package="com.yourcompany" />

However, you can override this behavior using the @Scope annotation. For example: @Scope(ConfigurableBeanFactory.SCOPE_PROTOTYPE)

@Controller

@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Controller
@ResponseBody
public @interface RestController {
    @AliasFor(
        annotation = Controller.class
    )
    String value() default "";
}