springboot系列3-helloworld实现

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1.导入springboot相关的依赖

打开pom.xml文件，添加如下内容

	<!-- Inherit defaults from Spring Boot -->
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.6.RELEASE</version>
	</parent>

	<!-- Add typical dependencies for a web application -->
	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
	</dependencies>

2.编写一个主程序，启动SpringBoot应用

package com.air;

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

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

3.编写相关的Controller、Service

@Controller
public class HelloController {

    @ResponseBody
    @RequestMapping("/hello")
    public String hello() {
        return "Hello world!";
    }
}

4.测试

运行main方法：

	2018-10-24 21:44:01.858  INFO 17944 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
	2018-10-24 21:44:01.861  INFO 17944 --- [           main] com.air.HelloWorldMainApplication        : Started HelloWorldMainApplication in 1.659 seconds (JVM running for 3.059)

看到tomcat已经启动

浏览器中输入下面的地址测试：

http://localhost:8080/hello

浏览器会输出Hello world!

至此，helloworld 工程已经成功完成