Spring Bean을 Servlet Filter에서 사용

Spring Bean을 Injection하여 Servlet Filter를 활용한 사용자 접근 통계 예제.
 
1. Service Class
Filter Class에 Injection할 Service Bean.

public class LogServiceImpl implements LogService {

@Autowired

private LogDao logDao;

public void insertLog(LogBean log) {

logDao.insertLog(log);

}

[...]

}

2. Filter Class 
component-scan으로 자동 등록된 Bean은 Injection이 안되는 것 같음? 아래 Spring Bean 설정에서 Bean을 선언 하여 사용.

public class AccessLogFilter implements Filter {

@Autowired

private LogService logService;

public void init(FilterConfig filterConfig) throws ServletException {

}

public void doFilter(ServletRequest sReq, ServletResponse sRes, FilterChain chain) throws IOException, ServletException {

[...]

chain.doFilter(sReq, sRes);

logService.insertLog(log);

}

public void destroy() {

}

}

3. Spring Bean 설정

<!-- Service Bean -->
<bean id="logService" class="com.rurony.format.access.service.LogServiceImpl" />
 <!-- Filter Bean -->

<bean id="accessLogFilter" class="com.rurony.format.filter.AccessLogFilter" />

4. web.xml 설정
스프링에서 제공하는 DelegatingFilterProxy를 사용하여 설정, 위 Spring Bean 설정에서 선언된 Filter Bean의 id와 filter-name을 같게 설정.

<filter>

<filter-name>accessLogFilter</filter-name>

<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>

</filter>

  

<filter-mapping>

<filter-name>accessLogFilter</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>