項目目錄結構：

com     +- xx         +- application.java         |         +- controller         |   +- SimpleController .java         |         +- entity             +- User.java
1. Eclipse創建一個簡單的Maven工程：
com +- example     +- myPRoject         +- Application.java         |         +- domain         |   +- Customer.java         |   +- CustomerRepository.java         |         +- service         |   +- CustomerService.java         |         +- web             +- CustomerController.java
2.修改pop.xml
把下面代碼添加進去
    <parent>	<groupId>org.springframework.boot</groupId>	<artifactId>spring-boot-starter-parent</artifactId>	<version>1.5.1.RELEASE</version>    </parent>    <dependencies>	<dependency>	   <groupId>org.springframework.boot</groupId>	   <artifactId>spring-boot-starter-web</artifactId>	</dependency>    </dependencies>3.實體類
package com.xx.entity;public class User {	private int id;	private String name;	public User() {	}	public User(int id, String name) {		this.id = id;		this.name = name;	}	public int getId() {		return id;	}	public void setId(int id) {		this.id = id;	}	public String getName() {		return name;	}	public void setName(String name) {		this.name = name;	}}4.Controller類
package com.xx.controller;import org.springframework.web.bind.annotation.*;import com.xx.entity.User;@RestControllerpublic class SimpleController {	@RequestMapping("/hello")	String hello() {		return "Hello World!";	}	@RequestMapping("/user/{id}")	User user(@PathVariable("id") int id) {		User user = new User(id, "yourName");		return user;	}}5.Application類
package com.xx;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.EnableAutoConfiguration;import org.springframework.context.annotation.ComponentScan;import org.springframework.context.annotation.Configuration;@Configuration@ComponentScan@EnableAutoConfigurationpublic class Application {	public static void main(String[] args) throws Exception {        SpringApplication.run(Application.class);    }}
6.Spring Boot建議將我們main方法所在的主要的配置類配置在根包名下。
在這個工程里“main方法所在的主要的配置類”為Application類。（見頂部目錄圖）