1.1 使用IntelliJ IDEA搭建Spring-Boot的"Hello World"项目

Development Software : IntelliJ IDEA 2017
Development environment : JAVA 1.8

Step 1 : Create a conventional Maven project.

Step 2 : Setting configuration file ( pom.xml )

     <?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">   

 <modelVersion>4.0.0</modelVersion>

<groupId>springboot</groupId>

<artifactId>springboot</artifactId>

<version>1.0-SNAPSHOT</version>

<parent>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-parent</artifactId>

<version>1.5.2.RELEASE</version>      

<relativePath/> <!-- lookup parent from repository -->    

</parent> 

<properties>        

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>        

<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>        

<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-thymeleaf</artifactId>        

</dependency>        

<dependency>            

<groupId>org.springframework.boot</groupId>            

<artifactId>spring-boot-starter-data-mongodb</artifactId>        

</dependency>    

</dependencies>    

<build>        

<plugins>            

<plugin>                

<groupId>org.springframework.boot</groupId>                

<artifactId>spring-boot-maven-plugin</artifactId>            

</plugin>        

</plugins>    

</build> 

 </project>

Step 3 : Import configuration file("pom.xml") required JAR packets

1 : Right-click project.

2 : Select "Maven" option.

3 : Click "Reimport" button.

Post Scriptum ： you should execute this operation after changing the configuration file.

Step 4 : Creaet start-up file(Class file)

Post Scriptum ： 

1、Class file should cite (org.springframework.boot.SpringApplication、org.springframework.stereotype.Controller

、org.springframework.boot.autoconfigure.SpringBootApplication)

2、Class file should add annotation

(@Controller  、@SpringBootApplication)

Step 5 : Edit function code

@RequestMapping(value = "index")
@ResponseBody
String index(){

return "hello world";

}

Post Scriptum ： 

1、@RequestMapping(value = "index") is function access path

(access this function local path is http://localhost:8080/index).

2、@ResponseBody is use to get request data.

Step 6 : Run project

1 : Right-click class file.

2 : click "Run xxxxxxxx(class name)" button.

If there is no error in the project , console will display☟

access local path

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If there have any errors(both of English and Code) . please comment me , i'm glad to correct those.