1 package com.day01.springboot.demo.model;
 2
 3 /**
 4  * Created by Administrator on 2017/12/19.
 5  */
 6 public class User {
 7     private Integer id;
 8     private String userName;
 9     private String password;
10
11     public Integer getId() {
12         return id;
13     }
14
15     public void setId(Integer id) {
16         this.id = id;
17     }
18
19     public String getUserName() {
20         return userName;
21     }
22
23     public void setUserName(String userName) {
24         this.userName = userName;
25     }
26
27     public String getPassword() {
28         return password;
29     }
30
31     public void setPassword(String password) {
32         this.password = password;
33     }
34 }

 1 package com.day01.springboot.demo.dao;
 2
 3 import com.day01.springboot.demo.model.User;
 4
 5 import java.util.ArrayList;
 6 import java.util.List;
 7
 8 /**
 9  * Created by Administrator on 2017/12/19.
10  */
11 public class UserDao {
12     public List<User> queryUserList(){
13         List<User> result = new ArrayList<User>();
14         // 模拟数据库的查询
15         for (int i = 0; i < 10; i++) {
16             User user = new User();
17             user.setId(i);
18             user.setUserName("知识帝-"+i);
19             user.setPassword("admin-"+i);
20             result.add(user);
21         }
22         return result;
23     }
24 }

 1 package com.day01.springboot.demo.service;
 2
 3 import com.day01.springboot.demo.dao.UserDao;
 4 import com.day01.springboot.demo.model.User;
 5 import org.springframework.beans.factory.annotation.Autowired;
 6 import org.springframework.stereotype.Service;
 7
 8 import java.util.List;
 9
10 /**
11  * Created by Administrator on 2017/12/19.
12  */
13 @Service
14 public class UserService {
15     @Autowired // 注入Spring容器中的bean对象
16     private UserDao userDAO;
17
18     public List<User> queryUserList() {
19         // 调用userDao中的方法进行查询
20         return userDAO.queryUserList();
21     }
22 }

 1 package com.day01.springboot.demo;
 2
 3 import com.day01.springboot.demo.dao.UserDao;
 4 import org.springframework.context.annotation.Bean;
 5 import org.springframework.context.annotation.ComponentScan;
 6 import org.springframework.context.annotation.Configuration;
 7
 8 /**
 9  * Created by Administrator on 2017/12/19.
10  */
11 @Configuration //通过该注解来表明该类是一个Spring的配置，相当于一个xml文件
12 @ComponentScan(basePackages = "com.day01.springboot.demo") //配置扫描包
13 public class SpringConfig {
14
15     @Bean // 通过该注解来表明是一个Bean对象，相当于xml中的<bean>
16     public UserDao getUserDAO(){
17         return new UserDao(); // 直接new对象做演示
18     }
19 }

 1 package com.day01.springboot.demo;
 2
 3 import com.day01.springboot.demo.model.User;
 4 import com.day01.springboot.demo.service.UserService;
 5 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 6
 7 import java.util.List;
 8
 9 /**
10  * Created by Administrator on 2017/12/19.
11  */
12 public class Main {
13     public static void main(String[] args) {
14         // 通过Java配置来实例化Spring容器
15         AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(SpringConfig.class);
16         // 在Spring容器中获取Bean对象
17         UserService userService = context.getBean(UserService.class);
18         // 调用对象中的方法
19         List<User> list = userService.queryUserList();
20         for (User user : list) {
21             System.out.println(user.getId()+" , "+user.getUserName() + ", " + user.getPassword() );
22         }
23         // 销毁该容器
24         context.destroy();
25     }
26 }