Spring3 MVC 拦截器

<!-- 拦截器 -->      <mvc:interceptors>          <mvc:interceptor>              <mvc:mapping path="/*.do" />              <bean class="com.log.report.interceptor.AccessStatisticsIntceptor" />          </mvc:interceptor>      </mvc:interceptors>

定义一个全局的拦截器：
定义在servlet-config.xml文件中。

以下是一个拦截器，它用来记录访问的ip和流量。

拦截器需要实现HandlerInterceptor接口，同时实现相应的方法。在PreHandler方法中，返回值如果是false，就会拦截住请求。

 

 

import java.text.SimpleDateFormat;import java.util.Date;import java.util.HashMap;import java.util.Map;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;public class AccessStatisticsIntceptor implements HandlerInterceptor {public static long access_num = 0;public static Map<String,Long> IPMap = new HashMap<String,Long>();public static Map<String,Long> urlMap = new HashMap<String,Long>();@Overridepublic void afterCompletion(HttpServletRequest arg0,HttpServletResponse arg1, Object arg2, Exception arg3)throws Exception {// TODO Auto-generated method stub}@Overridepublic void postHandle(HttpServletRequest arg0, HttpServletResponse arg1,Object arg2, ModelAndView arg3) throws Exception {// TODO Auto-generated method stub}@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response,Object obj) throws Exception {access_num += 1;SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");Date now = new Date();String ip = request.getHeader("x-forwarded-for");        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {            ip = request.getHeader("Proxy-Client-IP");        }        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {            ip = request.getHeader("WL-Proxy-Client-IP");        }        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {            ip = request.getRemoteAddr();        }           String url = request.getRequestURI() != null ? request.getRequestURI().toString() : null;    url= sdf.format(now) + "-" + url;    if(url != null && urlMap.containsKey(url)) {    urlMap.put(url, urlMap.get(url) + 1 );    } else if(url != null) {    urlMap.put(url, 1l);    }        String key = sdf.format(now) + "-" + ip;        if(IPMap.containsKey(key)) {    IPMap.put(key, IPMap.get(key) + 1 );    } else {    IPMap.put(key, 1l);    }return true;}}