Spring Boot is a new framework provided by the Pivotal team, which is designed to simplify the initial construction and development process of new spring applications. The framework uses a specific way to configure, so that developers no longer need to define a templated configuration. In this way, Spring Boot is committed to becoming a leader in the booming area of rapid application development
- Independent Spring applications can be created, and executable JARs and WARs can be created based on their Maven or Gradle plug-ins;
- Embedded Servlet containers such as Tomcat or Jetty;
- Provide automatically configured "starter" project object model (POMS) to simplify Maven configuration;
- Configure the Spring container as automatically as possible;
- Provide ready features such as metrics, health checks, and external configurations;
- Absolutely no code generation, no XML configuration required.
Environment and tools: JDK 1.8, Maven 3.0 +, IntelliJIDEA2018 (it is recommended to use idea to build and learn springboot, and idea is very friendly to audit and generate springboot)
Step 1: idea – file – new file – project; then select Next
Next: select project information; select next
Next: add support, select web, and click Next
Next: select the project name, click finish to complete the build, and wait for maven to add the required dependency package
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.15.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.springboot</groupId> <artifactId>demo</artifactId> <version>0.0.1-SNAPSHOT</version> <name>demo</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
The start class of springboot, from which the project starts without tomcat configuration
Create a new controller
stay DemoApplication.class The new package or class will take effect
Use * * @ restcontroller in HellowController** ,@RestController=@Controller+@ResponseBody
Is returned in json format
Then start the project:
And the default port of tomcat embedded in springboot is 8080:
The replacement port needs to be application.properties Configure; and springboot supports the yml file format
application.properties : (the properties file is written in the form of '.' points.)
application.yml : (the YML file is written in the format of ':' colon)
Default port: 8080
Change port: 8888
Start successfully! The springboot demo is complete. Springboot perfectly solves the requirements of various configuration files of spring before; it can be completed step by step. Chicken and vegetable peck at each other. Don't spray.
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