@Data
public class User {
 private String username;
 private String password;
 private Integer age;
}

public class UserDao{
 public List<User> queryUserList() {
  List<User> result = new ArrayList<User>();
  //模擬數(shù)據(jù)庫(kù)查詢
  for(int i = 1;i < 10; i++) {
    User user = new User();
    user.setUsername("username_" + i);
    user.setPassword("password" + i);
    user.setAge(i);
    result.add(user);
  }
  return result;
 }
}

@service
public class UserService{
 @Autowired//注入Spring容器中的bean對(duì)象
 private UserDao userDao;
 public List<User> queryUserList() {
  //調(diào)用userDao中的方法進(jìn)行查詢。
  return this.userDao.queryUserList();
 } 
}

@Configuration//通過(guò)該注解來(lái)表明該類是一個(gè)spring的配置，相當(dāng)于一個(gè)xml文件。
//配置掃描包。
@ComponentScan(basePackages = "cn.my.springboot.javaconfig")
public class SpringConfig {
 @Bean//通過(guò)該注解來(lái)表明是一個(gè)Bean對(duì)象，相當(dāng)于xml中的<bean>
 public UserDao getUserDao() {
  return new UserDao();//直接new對(duì)象作演示。
 }
}

public class Test {
 public static void main(String[] args) {
  //通過(guò)java配置來(lái)實(shí)例化Spring容器。
  AnnotationConfigApplicationContext context = new 
  AnnotationConfigApplicationContext(SpringConfig.class); 

  //在Spring容器中獲取bean對(duì)象
  UserService userService = context.getBean(UserService.class);

  //調(diào)用對(duì)象中的方法
  List<User> list = userService.queryUserList();
  for(User user : list) {
   System.out.println(user.getUsername() + "|" user.getPassword() + "|" user.getAge());
  //銷毀該容器
  context.destroy;
  }
 }
}