spring boot Hello World

package com.example.myFirstproject;

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);
  }
}

package com.example.myFirstproject;

import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@EnableAutoConfiguration
public class Example {

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

  @RequestMapping("/hello/{myName}")
  String index(@PathVariable String myName) {
    return "Hello " + myName + "!!!";
  }
}

<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.example</groupId>
  <artifactId>myFirstproject</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>myFirstproject</name>
  <url>http://maven.apache.org</url>

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

  <parent>  
        <groupId>org.springframework.boot</groupId>  
        <artifactId>spring-boot-starter-parent</artifactId>  
        <!-- <version>1.4.0.BUILD-SNAPSHOT</version>   -->
        <version>1.5.9.RELEASE</version>  
        <relativePath/> <!-- lookup parent from repository -->  
  </parent>  
    
    
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <scope>test</scope>
    </dependency>
    
     <dependency>  
            <groupId>org.springframework.boot</groupId>  
            <artifactId>spring-boot-starter-web</artifactId>  
     </dependency>  
        
  </dependencies>
  
   <!-- Package as an executable jar -->  
    <build>  
        <plugins>  
        <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
        </configuration>
      </plugin>
            <plugin>  
                <groupId>org.springframework.boot</groupId>  
                <artifactId>spring-boot-maven-plugin</artifactId>  
            </plugin>  
        </plugins>  
    </build>  
  
    <!-- Add Spring repositories -->  
    <!-- (you don't need this if you are using a .RELEASE version) -->  
   <!--  <repositories>  
        <repository>  
            <id>spring-snapshots</id>  
            <url>http://repo.spring.io/snapshot</url>  
            <snapshots><enabled>true</enabled></snapshots>  
        </repository>  
        <repository>  
            <id>spring-milestones</id>  
            <url>http://repo.spring.io/milestone</url>  
        </repository>  
    </repositories>  
    <pluginRepositories>  
        <pluginRepository>  
            <id>spring-snapshots</id>  
            <url>http://repo.spring.io/snapshot</url>  
        </pluginRepository>  
        <pluginRepository>  
            <id>spring-milestones</id>  
            <url>http://repo.spring.io/milestone</url>  
        </pluginRepository>  
    </pluginRepositories>   -->
</project>

运行Application打开网址

http://localhost:8080/

http://localhost:8080/hello/123