Spring3.0新特性（三）

3、常见三种配置方式：XML、Annotation、JavaConfig（ spring3.0新增）
JavaConfig配置：

@Configuration
public class AppConfig {
	@Bean
	public UserDAO userDAO() {
		return new UserDAOImpl();
	}
	
	//xml
	//<bean id = "userDAO" class="userDAO()"
}

下面有service、dao层的配置：

@Configuration
public class AppConfig {
	@Bean
	public UserDAO userDAO() {
		return new UserDAOImpl();
	}
	
	@Bean
	public UserService userService() {
		UserServiceImpl service = new UserServiceImpl();
		service.setUserDAO(userDAO());
		return service;
	}
}

更详细javaConfig见spring文档