Spring Boot's Hello World

• Learn by using the spring Boot "1.5.11.RELEASE" Official document and record a bit of growth.

2. About Spring Boot
   For spring, you can easily create stand-alone, production-level Spring applications, run directly with Java-jar, and provide a command-line tool for the spring Boot CLI to perform "Spring Scripts".
   Spring Boot Environment Dependent: Java 7 above, spring Framework 4.3.15.RELEASE above, Maven (3.2+), Gradle 2 (2.9 or later) and 3.
   
   
3. Installing Maven | Gradle, and configure the Spring boot Hello World project
   Spring boot provides a sample Pom.xml | Build.gradle, generally the spring boot project needs to inherit Groupid:org.springframework.boot.
   

   1 <?XML version= "1.0" encoding= "UTF-8"?>2 <Projectxmlns= "http://maven.apache.org/POM/4.0.0"Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"3 xsi:schemalocation= "http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">4     <modelversion>4.0.0</modelversion>5 6     <groupId>Com.example</groupId>7     <Artifactid>MyProject</Artifactid>8     <version>0.0.1-snapshot</version>9 Ten     <!--Inherit defaults from Spring Boot - One     <Parent> A         <groupId>Org.springframework.boot</groupId> -         <Artifactid>Spring-boot-starter-parent</Artifactid> -         <version>1.5.11.RELEASE</version> the     </Parent> -  -     <!--Add Typical dependencies for a Web application - -     <Dependencies> +         <Dependency> -             <groupId>Org.springframework.boot</groupId> +             <Artifactid>Spring-boot-starter-web</Artifactid> A         </Dependency> at     </Dependencies> -  -     <!--Package as an executable jar - -     <Build> -         <Plugins> -             <plugin> in                 <groupId>Org.springframework.boot</groupId> -                 <Artifactid>Spring-boot-maven-plugin</Artifactid> to             </plugin> +         </Plugins> -     </Build> the  * </Project>

   1 Plugins {2 ID ' org.springframework.boot ' version ' 1.5.11.RELEASE '3 id ' java '4 }5 6 7 Jar {8 baseName = ' MyProject '9 Version = ' 0.0.1-snapshot 'Ten } One  A Repositories { - Jcenter () - } the  - Dependencies { - compile ("Org.springframework.boot:spring-boot-starter-web") - testcompile ("Org.springframework.boot:spring-boot-starter-test") +}

5. Spring Boot CLI command line [HTTPS docs.spring.io/spring-boot/docs/1.5.11.release/reference/htmlsingle/# GETTING-STARTED-INSTALLING-THE-CLI]
   Spring Boot CLI supports execution of spring Script (. Groovy)
   

   @RestControllerclass Thiswillactuallyrun {    @RequestMapping ("/")    String Home () {        " Hello world! "     }}

   App.groovy

   Execute spring Run App.groovy to run App.groovy

6. Build the first spring Boot
   The first step: Create Pom.xml, can be configured according to the sample Pom.xml above, and then execute: MVN package to build the project environment, you can also import into the IDE to build the project environment;
   The second step: execution: mvn dependency:tree update dependency, you can also use the IDE to update dependent operations;
   Step three: Write the main class, Src/main/java/example.java
   

   1 Importorg.springframework.boot.*;2 ImportOrg.springframework.boot.autoconfigure.*;3 ImportOrg.springframework.stereotype.*;4 Importorg.springframework.web.bind.annotation.*;5 6 @RestController7 @EnableAutoConfiguration8  Public classExample {9 Ten@RequestMapping ("/") One String Home () { A         return"Hello world!"; -     } -  the      Public Static voidMain (string[] args)throwsException { -Springapplication.run (Example.class, args); -     } -  +}

   Fourth step: Debug Execution: MVN spring-boot:run run demo, open localhost:8080 can be accessed.

   Fifth step: Build the jar to configure build, then execute: MVN package, then execute: Java-jar Target/myproject-0.0.1-snapshot.jar can also be run.
   

   1 <Build>2     <Plugins>3         <plugin>4             <groupId>Org.springframework.boot</groupId>5             <Artifactid>Spring-boot-maven-plugin</Artifactid>6         </plugin>7     </Plugins>8 </Build>

Spring Boot's Hello World