第一个SpringBoot程序：Hello SpringBoot！

使用IDEA新建一个 Spring Initializr工程；
填写Group和Artifact；
选择Web依赖，Spring Boot默认选择最新版本(目前2.1.0)；
选择项目位置；
Finish；

主要项目文件说明

1. 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.senmentfault</groupId>
	<artifactId>spring-boot-lesson-1</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>spring-boot-lesson-1</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.1.0.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-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

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


</project>

2. SpringBootApplication启动类

package com.senmentfault.springbootlesson1;

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

@SpringBootApplication
public class SpringBootLesson1Application {

	public static void main(String[] args) {
		SpringApplication.run(SpringBootLesson1Application.class, args);
	}
}

3. application.yml配置文件

server:
  port: 80
  servlet:
    context-path: /test
person:
  name: Jun
  age: 31

4. HelloController.java

package com.senmentfault.springbootlesson1.controller;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import java.util.HashMap;
import java.util.Map;

/**
 * Created by Jun
 * 14:45 2018/11/5
 */
@RestController
public class HelloController {

    @Value("${person.name}")
    private String name;

    @Value("${person.age}")
    private Integer age;

    @RequestMapping(value="hello",method = RequestMethod.GET )
    public String sayHello() {
        return "Hello Spring Boot";
    }

    @RequestMapping(value="info",method = RequestMethod.GET )
    public String sayInfo(){
        String str ="姓名："+name+"\n;年龄："+age;
        return str;
    }

    @RequestMapping(value="mapinfo",method = RequestMethod.GET )
    public Map<String,Object> sayMapInfo(){
        String str ="姓名："+name+"\n;年龄："+age;
        Map<String,Object> map =new HashMap<>();
        map.put("name",name);
        map.put("age",age);
        return map;
    }
    }