[Spring] 게시판 만들기(11) - 인터셉터(Interceptor) 설정

 인터셉터를 지원하는 추상클래스 HandlerInterceptorAdaptor는 preHandler(), postHandle(), afterCompletion() 3가지 메서드를 지원하며, preHandler()과 postHandle()는 전처리기와 후처리기에 역할을 수행하며, preHandler()은 컨트롤러가 호출되기 전에 실행되고, postHandle()은 컨트롤러가 실행되고 난 후에 호출됩니다. 

 컨트롤러 실행 전이나 후에 공통적인 작업을 처리할 수 있는 HandlerInterceptorAdaptor를 상속받아 인터셉터를 설정하는 작업을 진행하도록 하겠습니다. 

 

1. HandlerInterceptorAdapter를 상속받아 구현할 자바 파일을 생성

1_1. src/main/java 폴더 com.spring.board 패키지에 common 폴더를 생성한 후 LoggerInterceptor.java 파일을 추가하세요.

package com.spring.board.common;
 
import java.util.Enumeration;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
 
public class LoggerInterceptor extends HandlerInterceptorAdapter {
 
    protected final Logger logger = LoggerFactory.getLogger(LoggerInterceptor.class);
 
    @SuppressWarnings("rawtypes")
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        logger.debug("==================== LoggerInterceptor START ====================");
        logger.debug(" URI [{}]," + request.getRequestURI());
 
        Enumeration paramNames = request.getParameterNames();
        while (paramNames.hasMoreElements()) {
            String key = (String) paramNames.nextElement();
            String value = request.getParameter(key);
            logger.debug(" RequestParameter Data ==>  " + key + " : " + value + "");
        }
 
        return super.preHandle(request, response, handler);
    }
 
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView)
            throws Exception {
 
        logger.debug("==================== LoggerInterceptor END ====================");
    }
}
 

 

 

 

2. servlet-context.xml 설정 추가

<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/mvc"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:beans="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">
 
    <!-- DispatcherServlet Context: defines this servlet's request-processing infrastructure -->
    
    <!-- Enables the Spring MVC @Controller programming model -->
    <annotation-driven />
 
    <!-- Handles HTTP GET requests for /resources/** by efficiently serving up static resources in the ${webappRoot}/resources directory -->
    <resources mapping="/resources/**" location="/resources/" />
 
    <!-- Resolves views selected for rendering by @Controllers to .jsp resources in the /WEB-INF/views directory -->
    <beans:bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <beans:property name="prefix" value="/WEB-INF/views/" />
        <beans:property name="suffix" value=".jsp" />
    </beans:bean>
    
    <context:component-scan base-package="com.spring.board" />
    
    <mvc:interceptors>
        <mvc:interceptor>
            <mvc:mapping path="/**"/>
            <beans:bean id="loggerInterceptor" class="com.spring.board.common.LoggerInterceptor"></beans:bean>
        </mvc:interceptor>
    </mvc:interceptors>
    
</beans:beans>

 

 

3. 인터셉터(Interceptor) 설정 확인
3_1. localhost:9090/board/sample/getSample 호출 시에 preHandle(), postHandle() 메서드가 호출되는지 확인하세요. 

 

소스 코드는 Github Repository - https://github.com/tychejin1218/board_v1 (branch : section11) 를 참조하세요.
Github에서 프로젝트 가져오기 - https://tychejin.tistory.com/33