How can I use springboot everyday without knowing its principle of automatic assembly?

itread01 2021-01-22 13:59:55
use springboot everyday knowing principle


### Introduction a reader is interviewing recently , I was asked such a question in the interview “ Look, you used it in your project `springboot`, You say `springboot` How to realize the automatic configuration of ?” This should be a `springboot` It's the most common interview question . Now let's dissect this problem together `springBoot` The principle of automatic configuration .### SpringMvc and SpringBoot First of all, let's review the original construction of a `springmvc` Of `hello-word` Of `web` Project (`xml` Configured ) Are we going to `pom` Import all kinds of dependencies , Then there may be version conflicts among the dependencies, which need to be excluded . When you go through all kinds of hardships to solve the dependence , And then you need to write `web.xml、springmvc.xml` Configuration files, etc . We just want to write ` One hello-word` It's just a project , It's true that a lot of time is spent on configuring files and `jar` The dependency of the package . Greatly affected the efficiency of our development , And increased `web` The difficulty of development . To simplify this complex configuration 、 And the conflicting dependencies of each version ,`springBoot` It came into being . We are now passing through `idea` Build a `springboot` The project can be solved in minutes , You don't have to care about the various configurations ( Basically achieve zero configuration ). Let you really realize out of the box .`SpringBoot` Help you save a lot of time to accompany your girlfriend , No, how can a programmer have a girlfriend ?(** If not, it's OK new One of them **) Its emergence not only allows you to spend more time on your business logic development , And it also greatly reduces `web` The threshold of development . therefore `SpringBoot` It's better to understand people's clothes , Wrong. Wrong is understanding , Know where the pain points for developers are .![ Insert picture description here ](https://img-blog.csdnimg.cn/20200723225955205.png)### SpringBoot Automatic configuration loading `Springboot` Even though it's easy to use , But as a user , We are still curious about how it can help us realize out of the box use .`Spring Boot` There is a global configuration file :`application.properties or application.yml`. All kinds of arguments can be configured in this global file. For example, if you want to change a port `server.port` Or want to adjust the level of the log, all can be configured . For more configurable properties, please refer to the official website .https://docs.spring.io/spring-boot/docs/2.3.0.RELEASE/reference/htmlsingle/#common-application-properties![](https://img-blog.csdnimg.cn/20200720224048800.png) So many attributes , How do these properties work in a project ?`SpringBoot` There is no configuration in the project , To configure ”(`application.properties or application.yml` With the exception of ), Both However, there is no breakthrough in configuration , Then we can only find the entry from the startup class . The startup class is just a bare one `main` Method , Class has only one annotation `SpringBootApplication` The note is `Spring Boot` Necessary notes for the project . Then the auto configuration principle must be closely related to this annotation ! Let's take a look at this annotation .**@SpringBootApplication Notes **```java@Target(ElementType.TYPE)@Retention(RetentionPolicy.RUNTIME)@Documented@Inherited@SpringBootConfiguration@EnableAutoConfiguration@ComponentScan(excludeFilters = { @Filter(type = FilterType.CUSTOM, classes = TypeExcludeFilter.class), @Filter(type = FilterType.CUSTOM, classes = AutoConfigurationExcludeFilter.class) })public @interface SpringBootApplication {``` There's nothing to say about the top four notes , Basically, if you have implemented a custom annotation , We all know what it means .- `@SpringBootConfiguration` Inherited from `@Configuration`, The two functions are the same , Mark that the current class is a configuration class .- `@ComponentScan` Used on a class or interface to specify a scan path , Follow Xml
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