1. Create User entity class.
@Data
public class User {
private String username;
private String password;
private Integer age;
}
2. Create UserDao to simulate database interaction.
public class UserDao{
public List queryUserList() {
List result = new ArrayList();
//模拟数据库查询
for(int i = 1;i 3. Write UserService to implement User data operation business logic.
@service
public class UserService{
@Autowired//注入Spring容器中的bean对象
private UserDao userDao;
public List queryUserList() {
//调用userDao中的方法进行查询。
return this.userDao.queryUserList();
}
}
4. Write SpringConfig to instantiate the Spring container.
@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。
//配置扫描包。
@ComponentScan(basePackages = "cn.my.springboot.javaconfig")
public class SpringConfig {
@Bean//通过该注解来表明是一个Bean对象，相当于xml中的
public UserDao getUserDao() {
return new UserDao();//直接new对象作演示。
}
}
5. Write a test method to start the Spring container.
public class Test {
public static void main(String[] args) {
//通过java配置来实例化Spring容器。
AnnotationConfigApplicationContext context = new
AnnotationConfigApplicationContext(SpringConfig.class);
//在Spring容器中获取bean对象
UserService userService = context.getBean(UserService.class);
//调用对象中的方法
List list = userService.queryUserList();
for(User user : list) {
System.out.println(user.getUsername() + "|" user.getPassword() + "|" user.getAge());
//销毁该容器
context.destroy;
}
}
}
Test results:
You can use java code to perfectly replace the XML configuration file.
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