[Reading notes] One, Spring boot project setup and configuration files

Reading notes: [The subversive developer of Java EE Development Spring Boot combat] Author: Wang Yunfei

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One, First contact

Spring Boot Project Hello World build

The 1.pom.xml configuration is as follows:

<Projectxmlns= "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 http://maven.apache.org/xsd/maven-4.0.0.xsd">    <modelversion>4.0.0</modelversion>    <groupId>Com.springboot</groupId>    <Artifactid>Springboot_test1_1</Artifactid>    <version>0.0.1-snapshot</version>    <Packaging>Jar</Packaging>    <name>Springboot_test1_1</name>    <URL>http://maven.apache.org</URL>    <Parent>        <groupId>Org.springframework.boot</groupId>        <Artifactid>Spring-boot-starter-parent</Artifactid>        <version>1.5.2.RELEASE</version>        <RelativePath/>    </Parent>    <Properties>        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>    </Properties>    <Dependencies>        <Dependency>            <groupId>Org.springframework.boot</groupId>            <Artifactid>Spring-boot-starter-web</Artifactid>        </Dependency>    </Dependencies>    <Build>        <Plugins>            <plugin>                <groupId>Org.springframework.boot</groupId>                <Artifactid>Spring-boot-maven-plugin</Artifactid>            </plugin>        </Plugins>    </Build></Project>

Pom.xml

The 2.main entry class is as follows:

 Packagecom.springboot.springboot_test1_1;Importorg.springframework.boot.SpringApplication;Importorg.springframework.boot.autoconfigure.SpringBootApplication;Importorg.springframework.web.bind.annotation.RequestMapping;ImportOrg.springframework.web.bind.annotation.RestController; @RestController//@SpringBootApplication is the core annotation of the Spring boot project//It is a combination of annotations, the main combination of @configuration, @EnableAutoConfiguration, @ComponentScan//If you do not use @springbootapplication, use @configuration directly, @EnableAutoConfiguration, @ComponentScan can also//TIPS1://@EnableAutoConfiguration: Let spring boot automatically configure the current project based on the jar package dependencies in the Classpath//TIPS2://Spring Boot automatically scans the peers of the @springbootapplication annotation class and the bean in the sub-package, so that the @springbootapplication annotation class is typically placed in the top-level directory@SpringBootApplication Public classApp {//Main method as the starting entry     Public Static voidMain (string[] args) {Springapplication.run (App.class, args); } @RequestMapping ("/")     PublicString Index () {return"Hello Spring boot!"; }}

App.java

3. Run main class, browser access: http://localhost:8080/

Output:

Hello Spring boot!

It worked.

Second, the Properties configuration file

1. Using the Application.properties configuration file

Spring Boot can use the application.properties configuration file, such as using application.properties to modify the port number and access path for Tomcat:

Application.properties:

server.port=9090server.context-path=/helloboot

Browser access: http://localhost:9090/helloboot/

Success.

2. Use the properties in the Application.properties configuration file

Application.properties:

App.name=spring Boot test App

App.java:

 Packagecom.springboot.springboot_test1_1;ImportOrg.springframework.beans.factory.annotation.Value;Importorg.springframework.boot.SpringApplication;Importorg.springframework.boot.autoconfigure.SpringBootApplication;Importorg.springframework.web.bind.annotation.RequestMapping;ImportOrg.springframework.web.bind.annotation.RestController; @RestController//@SpringBootApplication is the core annotation of the Spring boot project//It is a combination of annotations, the main combination of @configuration, @EnableAutoConfiguration, @ComponentScan//If you do not use @springbootapplication, use @configuration directly, @EnableAutoConfiguration, @ComponentScan can also//TIPS1://@EnableAutoConfiguration: Let spring boot automatically configure the current project based on the jar package dependencies in the Classpath//TIPS2://Spring//Boot automatically scans the peers of the @springbootapplication annotation class and the bean in the sub-package, so that the @springbootapplication annotation class is typically placed in the top-level directory@SpringBootApplication Public classApp {//Main method as the starting entry     Public Static voidMain (string[] args) {Springapplication.run (App.class, args); } @Value ("${app.name}")    PrivateString AppName; @RequestMapping ("/")     PublicString Index () {return"Hello Spring boot! AppName: "+AppName; }}

App.java

3. Type-safe configuration (based on properties)

Application.properties:

Author.name=cainiao87author.age=

App.java:

 Packagecom.springboot.springboot_test1_1;Importorg.springframework.beans.factory.annotation.Autowired;ImportOrg.springframework.beans.factory.annotation.Value;Importorg.springframework.boot.SpringApplication;Importorg.springframework.boot.autoconfigure.SpringBootApplication;Importorg.springframework.web.bind.annotation.RequestMapping;ImportOrg.springframework.web.bind.annotation.RestController; @RestController//@SpringBootApplication is the core annotation of the Spring boot project//It is a combination of annotations, the main combination of @configuration, @EnableAutoConfiguration, @ComponentScan//If you do not use @springbootapplication, use @configuration directly, @EnableAutoConfiguration, @ComponentScan can also//TIPS1://@EnableAutoConfiguration: Let spring boot automatically configure the current project based on the jar package dependencies in the Classpath//TIPS2://Spring//Boot automatically scans the peers of the @springbootapplication annotation class and the bean in the sub-package, so that the @springbootapplication annotation class is typically placed in the top-level directory@SpringBootApplication Public classApp {//Main method as the starting entry     Public Static voidMain (string[] args) {Springapplication.run (App.class, args); } @Value ("${app.name}")    PrivateString AppName; @AutowiredPrivateauthorsettings setting; @RequestMapping ("/")     PublicString Index () {return"Hello Spring boot! AppName: "+AppName; } @RequestMapping ("/author")     PublicString author () {return"I ' m:" + setting.getname () + ", Age:" +Setting.getage (); }}

App.java

Three, XML configuration file

Spring Boot does not recommend the use of an XML configuration file, and in some cases it must be required:

Using annotations: @ImportResource ("Classpath:xxx-config.xml")

Directory structure:

Four, profile configuration

Modify the Application.properties file, remove the Server.port property, and add the properties:

Spring.profiles.active=dev

2 new. Properties Configuration file:

Application-dev.properties:

server.port=8080

Application-prod.properties:

Server.port=80

This allows you to switch between the test and production environment configuration files by setting up Spring.profiles.active=dev or prod.

[Reading notes] One, Spring boot project setup and configuration files