在springmvc中通过过滤器获取request和response

搭建页面我就不详细的说了，只是简单的把要配置文件说一下

• 主要配置beans.xml文件和 spring-servlet.xml文件

beans.xml

 <bean id="timeBasedAccessInterceptor" class="zttc.itat.web.TestInterceptor">    
 </bean>    

 <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping">    
    <property name="interceptors">    
         <list>    
            <ref bean="timeBasedAccessInterceptor"/>    
        </list>    
   </property>    
</bean>

spring-servlet.xml

 **注意：配置中一定要去掉<mvc:annotation-driven />,去掉其默认配置，否则会实例化两个，自己写的那个TestInterceptor就不会拦截成功，获取的request和response为空**

DefaultAnnotationHandlerMapping ，所以用下面这个就好了。
    <context:component-scan base-package="zttc.itat.web"/>
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

• TestInterceptor页面代码，这里是继承HandlerInterceptorAdapter，然后在里面preHandle要处理的代码，我这里是是把request和response的值保存起来

package zttc.itat.web;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
import zttc.itat.model.RequestResponseContext;
public class TestInterceptor extends HandlerInterceptorAdapter {
    @Override
    public boolean preHandle(HttpServletRequest request,
            HttpServletResponse response, Object handler) throws Exception {
        // TODO Auto-generated method stub
        RequestResponseContext.setResponse(response);
        RequestResponseContext.setRequest(request);
        return super.preHandle(request, response, handler);
    }
}

• 这里是RequestResponseContext.java里的代码，主要是为了线程安全写的来保存response和request

 package zttc.itat.model;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class RequestResponseContext {
        private static ThreadLocal<HttpServletRequest> request_threadLocal = new ThreadLocal<HttpServletRequest>();
        private static ThreadLocal<HttpServletResponse> reponse_threadLocal = new ThreadLocal<HttpServletResponse>();

        public static void setRequest(HttpServletRequest request) {
            request_threadLocal.set(request);
        }
        public static HttpServletRequest getRequest() {
            return request_threadLocal.get();
        }
        public static void removeRequest() {
            request_threadLocal.remove();
        }
        public static void setResponse(HttpServletResponse response)                  {
            reponse_threadLocal.set(response);
        }
        public static HttpServletResponse getResponse() {
            return reponse_threadLocal.get();
        }
        public static void removeResponse() {
            reponse_threadLocal.remove();
        }
}

• 在其它页面就可以直接RequestResponseContext.getResponse()这样获取response了