2020 New Java Interview Questions-Spring Boot/Spring Cloud (1)

1. What is spring boot?

(Recommended tutorial: java interview questions)

In the large family of Spring framework, many derivative frameworks have been produced, such as Spring, SpringMvc framework, etc. The core content of Spring lies in Inversion of Control (IOC) and Dependency Injection (DI). The so-called Inversion of Control is not a technology, but an idea. In terms of operation, it refers to creating in the spring configuration file. Dependency injection means that the spring container provides resources for an object of the application, such as reference objects, constant data, etc.

SpringBoot is a framework, a brand-new programming specification. Its emergence simplifies the use of the framework. The so-called simplification means simplifying the large number of cumbersome configuration files required in many Spring frameworks, so SpringBoot is A framework that serves frameworks whose service scope is simplified configuration files.

2. Why use spring boot?

• Spring Boot makes coding easy

• Spring Boot makes configuration easy

• Spring Boot makes deployment simple

• Spring Boot makes monitoring simple

• Spring’s shortcomings

3. What is the core configuration file of spring boot?

Spring Boot provides two commonly used configuration files:

• properties file

• yml file

4. What are the types of spring boot configuration files? What's the difference between them?

Spring Boot provides two commonly used configuration files, namely properties files and yml files. Compared with properties files, yml files are younger and have many pitfalls. YML uses spaces to determine the hierarchical relationship, making the configuration file structure clear, but it can also destroy the hierarchical relationship because of trivial spaces.

5. What are the ways to implement hot deployment in spring boot?

There are two ways to implement SpringBoot hot deployment:

1. Use spring loaded

to add the following code to the project:

<build>
        <plugins>
            <plugin>
                <!-- springBoot编译插件-->
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <dependencies>
                    <!-- spring热部署 -->
                    <!-- 该依赖在此处下载不下来，可以放置在build标签外部下载完成后再粘贴进plugin中 -->
                    <dependency>
                        <groupId>org.springframework</groupId>
                        <artifactId>springloaded</artifactId>
                        <version>1.2.6.RELEASE</version>
                    </dependency>
                </dependencies>
            </plugin>
        </plugins>
    </build>

Add After completion, you need to use the mvn command to run:

First find the Edit configurations in IDEA, and then perform the following operations: (Click the " " in the upper left corner, then select maven, the right panel will appear, enter in the red underlined area As shown in the picture, you can name the command (named here as MvnSpringBootRun))

Click save and it will appear in the IDEA project running section. Click the green arrow to run That's it

2. Use spring-boot-devtools

Add dependencies in the project's pom file:

 <!--热部署jar-->
 <dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-devtools</artifactId>
 </dependency>

Then: use shift ctrl alt "/" (shortcut key in IDEA) Select "Registry" and check compiler.automake.allow.when.app.running

The above is the detailed content of 2020 New Java Interview Questions-Spring Boot/Spring Cloud (1). For more information, please follow other related articles on the PHP Chinese website!