1. 攔截器的配置說明

   <mvc:interceptors>   
        <bean class="interceptor.HttpServletResponseInterceptor" />
    </mvc:interceptors>

1. 攔截器的實現

public class HttpServletResponseInterceptor extends HandlerInterceptorAdapter{

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws
 
 Exception {
        RequestResponseContext.setResponse(response);
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        RequestResponseContext.removeResponse();
    }
}
 

1. 這裡儲存的Httpresponse物件必須是多執行緒的，使用threadlocal解決這個問題，其實我們的tomact容器中也是這麼處理的，這裡不僅可以使用攔截器，其實原生的過濾器也是可以這麼處理的。我們在使用的時候就可以直接的使用啦！

public class RequestResponseContext {

    private static ThreadLocal<HttpServletRequest> REQUEST_CHREADLOCAL = new ThreadLocal<HttpServletRequest>();

    private static
 
 ThreadLocal<HttpServletResponse> REPONSE_THREADLOCAL = new ThreadLocal<HttpServletResponse>();

    public static void setRequest(HttpServletRequest request) {
        REQUEST_CHREADLOCAL.set(request);
    }

    public static HttpServletRequest getRequest() {
        return REQUEST_CHREADLOCAL.get();
    }

    public static void removeRequest() {
        REQUEST_CHREADLOCAL.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();
    }
}