攔截器配置

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1 <mvc:interceptors> 2 <mvc:interceptor> 3 <mvc:mapping path="/luxury/**" /> 4 <bean class="com.web.intercepter.ReqContextInterceptor" /> 5 </mvc:interceptor> 6 <!-- <mvc:interceptor> 7 <mvc:mapping path="/laundry/**" /> 8 <bean class="com.web.intercepter.ReqContextInterceptor" /> 9 </mvc:interceptor> --> 10 </mvc:interceptors>

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攔截器代碼

1 /** 2 * 攔截器--記錄當(dāng)前請(qǐng)求的request/reponse 3 * 4 * @author zhujunchao 5 */ 6 public class ReqContextInterceptor extends HandlerInterceptorAdapter { 7 8 @Override 9 public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { 10 // 統(tǒng)一處理邏輯 11 RequestResponseContext.setRequestAndResponse(request,response); 12 return true; 13 } 14 15 @Override 16 public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, 17 ModelAndView modelAndView) throws Exception { 18 //不處理 19 } 20 21 @Override 22 public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) 23 throws Exception { 24 } 25 }

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RequestResponseContext代碼

1 /** 2 * 存放當(dāng)前請(qǐng)求的request、response 3 */ 4 public class RequestResponseContext { 5 private static ThreadLocal<HttpServletRequest> request_threadLocal = new ThreadLocal<HttpServletRequest>(); 6 7 private static ThreadLocal<HttpServletResponse> reponse_threadLocal = new ThreadLocal<HttpServletResponse>(); 8 9 private RequestResponseContext() {} 10 11 public static void setRequestAndResponse(HttpServletRequest request,HttpServletResponse response) { 12 request_threadLocal.set(request); 13 reponse_threadLocal.set(response); 14 } 15 16 public static void clearRequestAndResponse() { 17 request_threadLocal.remove(); 18 reponse_threadLocal.remove(); 19 } 20 21 public static HttpServletRequest getRequest() { 22 return request_threadLocal.get(); 23 } 24 25 public static HttpServletResponse getResponse() { 26 return reponse_threadLocal.get(); 27 } 28 }

頁(yè)面1：/luxury/index?serviceCode=8002

1 @RequestMapping(value = "/luxury/index") 2 public String goodsList(IndexRequestVo reqVo) { 3 RequestResponseContext.getResponse().addCookie("serviceCode", String.valueOf(serviceCode)); 4 return "/luxury/index"; 5 }

頁(yè)面2：/laundry/index?serviceCode=8001

1 @RequestMapping(value = "/laundry/index") 2 public String goodsList(IndexRequestVo reqVo) { 3 RequestResponseContext.getResponse().addCookie("serviceCode", String.valueOf(serviceCode)); 4 return "/laundry/index"; 5 }

因?yàn)闆](méi)有對(duì)：/laundry 進(jìn)行攔截，出現(xiàn)了

　　請(qǐng)求1：/laundry/index?serviceCode=8001...

　　請(qǐng)求2：訪問(wèn)/luxury/index?serviceCode=8002 ?查看cookie的serviceCode值為8001（應(yīng)該為8002）

原因：

1.請(qǐng)求1：? ReqContextInterceptor 沒(méi)有對(duì) /laundry/* 進(jìn)行攔截，即沒(méi)有在RequestResponseContext（ThreadLocal）中 存放當(dāng)前請(qǐng)求的request、response

2.請(qǐng)求1：? 在調(diào)用RequestResponseContext.getResponse() 實(shí)際上獲取的是由/luxury/*請(qǐng)求放入的response-->因?yàn)樘幚碚?qǐng)求使用的是線程池里獲取的線程

　　　　　　這時(shí) response實(shí)際上是/luxury/*請(qǐng)求的response

3.請(qǐng)求1：調(diào)用response.addCookie,寫(xiě)值 serviceCode=8001

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流程：

1.　　/luxury/index?serviceCode=8002?? 請(qǐng)求，將response放入ThreadLocal中，寫(xiě)入cookie（serviceCode=8002）======>請(qǐng)求結(jié)束

2.　　/laundry/index?serviceCode=8001 請(qǐng)求，因?yàn)闆](méi)有寫(xiě)ThreadLocal 且同（1） 用的是同一個(gè)現(xiàn)成? 從ThreadLocal中獲取到（1）中的response

　　　　寫(xiě)入cookie（serviceCode=8001）======>請(qǐng)求結(jié)束

猜測(cè)兩種情況：

1》請(qǐng)求（2）寫(xiě)請(qǐng)求（1） 的response 導(dǎo)致請(qǐng)求(1)看到的cookie值改變

2》請(qǐng)求（3）請(qǐng)求（1） 重新刷新頁(yè)面 -->（新的response，新的線程），因?yàn)檎?qǐng)求（2）的response和請(qǐng)求（3）的response 指向同一個(gè)用戶、頁(yè)面，請(qǐng)求（2）的response后執(zhí)行addCookie(serviceCode=8001)，導(dǎo)致請(qǐng)求（1）或（3）最終看的的是cookie(serviceCode=8001)

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具體需要研究response 和socket io流? 這塊還不熟。。。。。。

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轉(zhuǎn)載于:https://www.cnblogs.com/zjc-cnblogs/p/7302635.html

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