목표
Service 및 DAO 객체 구현 방법에 대해서 배워 봅시다.
Service 및 DAO 객체 구현 방법
전체적인 흐름
웹 어플리케이션 준비
한글 처리
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<!-- The definition of the Root Spring Container shared by all Servlets and Filters -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring/root-context.xml</param-value>
</context-param>
<!-- Creates the Spring Container shared by all Servlets and Filters -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- Processes application requests -->
<servlet>
<servlet-name>appServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring/appServlet/servlet-context.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>appServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!-- 한글처리를 위한 filter -->
<filter>
<filter-name>encodingFilter</filter-name>
<filter-class>
org.springframework.web.filter.CharacterEncodingFilter
</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
위에서 filter 태그가 바로 한글처리를 위한 것입니다.
서비스 구현
@Service, @Repository, @Component 어노테이션을 달고 있으면 Controller 클래스에서
@Autowired, @Resource 어노테이션으로 자동주입을 할 수 있습니다.
서비스 클래스에 사용하기 가장 좋은, 추천하는 어노테이션은
@Service
다음 그림을 보면 알 수 있듯이 Controller에서는 자동주입을 가진 Service 객체를 가지고 있고
Service에서는 자동주입을 가진 Dao 객체를 가지고 있습니다.
- Service Class
//@Service
//@Service("memService")
//@Component
//@Component("memService")
//@Repository
@Repository("memService")
public class MemberService implements IMemberService {
@Autowired
MemberDao dao;
}
- Controller Class
@Controller
public class MemberController {
// MemberService service = new MemberService();
// @Autowired
@Resource(name="memService")
MemberService service;
}
DAO 구현
@Repository, @Component 어노테이션을 달고 있으면 Controller 클래스에서
@Autowired, @Resource 어노테이션으로 자동주입을 할 수 있습니다.
DAO 클래스에 사용하기 가장 좋은, 추천하는 어노테이션은
@Repository
- DAO Class
// @Component
@Repository
public class MemberDao implements IMemberDao {
private HashMap<String, Member> dbMap;
public MemberDao() {
dbMap = new HashMap<String, Member>();
}
}
- Service Class
@Repository("memService")
public class MemberService implements IMemberService {
@Autowired
MemberDao dao;
}
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