项目地址：https://github.com/snjl/springboot.myproject.git

Spring Boot框架本身并没有对工程结构有特别的要求，但是按照最佳实践的工程结构可以帮助我们减少可能会遇见的坑，尤其是Spring包扫描机制的存在，如果您使用最佳实践的工程结构，可以免去不少特殊的配置工作。

典型示例

root package结构：com.example.myproject
应用主类Application.java置于root package下，通常我们会在应用主类中做一些框架配置扫描等配置，我们放在root package下可以帮助程序减少手工配置来加载到我们希望被Spring加载的内容
实体（Entity）与数据访问层（Repository）置于com.example.myproject.domain包下
逻辑层（Service）置于com.example.myproject.service包下

Web层（web）置于com.example.myproject.web包下

com
  +- example
    +- myproject
      +- Application.java
      |
      +- domain
      |  +- Customer.java
      |  +- CustomerRepository.java
      |
      +- service
      |  +- CustomerService.java
      |
      +- web
      |  +- CustomerController.java
      |

创建：

项目结构：

工程构建

在上述基础，构建项目：

Customer.java
package com.example.myproject.domain;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

@Component
public class Customer {
    @Value("${com.example.myproject.customer.id}")
    private String id;
    @Value("${com.example.myproject.customer.name}")
    private String name;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

CustomerService.java
package com.example.myproject.service;

import com.example.myproject.domain.Customer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CustomerService {
    @Autowired
    private Customer customer;

    public void printCustomer() {
        System.out.println(customer.getName());
    }

    public Customer getCustomer(){
        return customer;
    }
}

CustomerController.java
package com.example.myproject.web;

import com.example.myproject.domain.Customer;
import com.example.myproject.service.CustomerService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;

/**
 * @author 34924
 */
@Controller
public class CustomerController {
    @Autowired
    CustomerService customerService;

    @RequestMapping("/customer")
    public String customer(ModelMap map) {
        Customer customer = customerService.getCustomer();
        map.addAttribute("customer", customer);
        return "index";
    }

}

index.html
<!DOCTYPE html>
<html xmlns:th="http://www.w3.org/1999/xhtml">
<head lang="en">
    <meta charset="UTF-8" />
    <title></title>
</head>
<body>
<h1 th:text="${customer.id}">Hello World</h1>
<h2 th:text="${customer.name}">name</h2>
</body>
</html>

application.properties

com.example.myproject.customer.id = 001
com.example.myproject.customer.name = jl

运行项目，访问localhost:8080/customer

也可以test：

MyprojectApplicationTests.java

package com.example.myproject;

import com.example.myproject.service.CustomerService;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@SpringBootTest
public class MyprojectApplicationTests {

    @Autowired
    private CustomerService customerService;

    @Test
    public void contextLoads() {
    }


    @Test
    public void testCustomer() {
        customerService.printCustomer();
        System.out.println(customerService.getCustomer());
    }
}

输出：

1 2	jl Customer{id='001', name='jl'}