package com.bdqn.utils;

import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;


public class CommonInterceptor implements HandlerInterceptor {
    private List<String> excludedUrls;
    public List<String> getExcludedUrls() {
        return excludedUrls;
    }
    public void setExcludedUrls(List<String> excludedUrls) {
        this.excludedUrls = excludedUrls;
    }
    /**
     *
     * @Description:
     * 在業務處理器處理請求之前被呼叫 如果返回false
     * 從當前的攔截器往回執行所有攔截器的afterCompletion(),
     * 再退出攔截器鏈, 如果返回true 執行下一個攔截器,
     * 直到所有的攔截器都執行完畢 再執行被攔截的Controller
     * 然後進入攔截器鏈,
     * 從最後一個攔截器往回執行所有的postHandle()
     * 接著再從最後一個攔截器往回執行所有的afterCompletion()
     *
     * @param  request
     *
     * @param  response
     *
     * @return: boolean
     *
     * @author: SongJia
     *
     * @date: 2016-6-27 下午4:17:51
     *
     */
    public boolean preHandle(HttpServletRequest request,
                             HttpServletResponse response, Object handler) throws Exception {
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
        response.setHeader("Access-Control-Max-Age", "3600");
        response.setHeader("Access-Control-Allow-Headers", "x-requested-with");
        return true;
    }

    // 在業務處理器處理請求執行完成後,生成檢視之前執行的動作
    public void postHandle(HttpServletRequest request,
                           HttpServletResponse response, Object handler,
                           ModelAndView modelAndView) throws Exception {

    }

    /**
     *
     * @Description:
     * 在DispatcherServlet完全處理完請求後被呼叫
     * 當有攔截器丟擲異常時,
     * 會從當前攔截器往回執行所有的攔截器的afterCompletion()
     *
     * @param request
     *
     * @param response
     *
     * @param handler
     *
     * @param ex
     *
     * @author: SongJia
     *
     * @date: 2016-6-27 下午4:27:51
     *
     */
    public void afterCompletion(HttpServletRequest request,
                                HttpServletResponse response, Object handler, Exception ex)
            throws Exception {


    }

}
 

<mvc:interceptors>
		<mvc:interceptor>
			<mvc:mapping path="/**" />
			<bean class="com.bdqn.utils.CommonInterceptor">
				<property name="excludedUrls">
					<list>
						<value>/</value>
					</list>
				</property>
			</bean>
		</mvc:interceptor>
	</mvc:interceptors>