Daily JAVA10 Questions about SpringBoot

This article mainly introduces 10 Spring Boot interview questions that are often encountered during the interview process. By reading this article, you will master the following 10 points

1. What is Spring Boot?

Spring Boot is a sub-project under the Spring open source organization. It is a one-stop solution for Spring components. It mainly simplifies the difficulty of using Spring, saves heavy configuration, and provides various startups. With the tool, developers can get started quickly.

2. Why use Spring Boot?

Spring Boot has many advantages, such as:

Simplified configuration for independent operation

Automatic configuration

No code generation and XML configuration

Application Monitoring

Easy to get started...

3. What are the core configuration files of Spring Boot? What's the difference?

The core configuration files of Spring Boot are the application and bootstrap configuration files.

The application configuration file is easy to understand and is mainly used for automated configuration of Spring Boot projects.

The bootstrap configuration file has the following application scenarios.

When using the Spring Cloud Config configuration center, you need to add the configuration attribute connected to the configuration center in the bootstrap

configuration file to load the configuration information of the external configuration center;

A small number of fixed attributes that cannot be overwritten;

A small number of encryption/decryption scenarios;

4. What are the formats of Spring Boot configuration files? What's the difference between them?

.properties and .yml, their difference is mainly in the writing format.

1).properties

2).yml

In addition, the .yml format does not support the @PropertySource annotation to import configuration.

5. Which is the core annotation of Spring Boot? What annotations does it mainly consist of?

The annotation on the startup class is @SpringBootApplication, which is also the core annotation of Spring Boot. The main combination includes the following three annotations:

@SpringBootConfiguration: combines the @Configuration annotation. Implement the functions of the configuration file.

@EnableAutoConfiguration: Turn on the automatic configuration function, you can also turn off an automatic configuration option, such as turning off the data source automatic configuration function: @SpringBootApplication(exclude

= { DataSourceAutoConfiguration.class }) .

@ComponentScan: Spring component scan.

6. What are the ways to enable Spring Boot features?

1) Inherit the spring-boot-starter-parent project

2) Import spring-boot-dependencies project dependencies

7, Spring Boot requires Does it run in standalone containers?

No need, there are built-in containers such as Tomcat/Jetty.

8. What are the ways to run Spring Boot?

1) Package with commands or put it in a container to run

2) Use Maven/Gradle plug-in to run

3) Directly execute the main method to run

9.What are the commonly used starters for springboot?

spring-boot-starter-web Embedding tomcat and web development requires servlet and jsp support

spring- boot-starter-data-jpa database support

spring-boot-starter-data-redis redis database support

spring-boot-starter-data-solr solr support

mybatis-spring-boot-starter Third-party mybatis integrated starter

10. What is the principle of Spring Boot automatic configuration?

Annotations @EnableAutoConfiguration, @Configuration, @ConditionalOnClass

is the core of automatic configuration. First of all, it must be a configuration file. Secondly, it must be automatically configured based on whether there is this class in the class path. configuration.

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