第一个 spring-boot 程序

本例使用 maven 作为项目管理工具

新建 pom.xml 文件，添加 spring-boot-starter-web 依赖：

 <dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-web</artifactId>
     <version>1.5.9.RELEASE</version>
 </dependency>

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>com.wangke</groupId>
     <artifactId>spring-boot-helloworld</artifactId>
     <version>1.0</version>

     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
         <version>1.5.9.RELEASE</version>
     </parent>

     <dependencies>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
     </dependencies>

     <properties>
         <java.version>1.8</java.version>
     </properties>

     <build>
         <plugins>
             <plugin>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
             </plugin>
         </plugins>
     </build>

 </project>

pom.xml

创建一个控制器

 package com.wangke.helloworld;

 import org.springframework.web.bind.annotation.RestController;
 import org.springframework.web.bind.annotation.RequestMapping;

 @RestController
 public class HelloController {

   @RequestMapping("/")
   public String index() {
     return "Hello World!";
   }
 }

创建 Application 类

 package com.wangke.helloworld;

 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;

 @SpringBootApplication
 public class Application {

   public static void main(String[] args) {
     SpringApplication.run(Application.class, args);
   }
 }

项目结构

运行程序

mvn clean package && java -jar target/spring-boot-helloworld-1.0.jar

或者

mvn spring-boot:run