获得HttpServletRequest 和HttpSession对象

package org.jeecgframework.core.util;import java.util.HashMap;import java.util.Map;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpSession;import org.springframework.web.context.request.RequestContextHolder;import org.springframework.web.context.request.ServletRequestAttributes;/*** @ClassName: ContextHolderUtils * @Description: TODO(上下文工具类) * @author  张代浩 * @date 2012-12-15 下午11:27:39 * */public class ContextHolderUtils {/** * SpringMvc下获取request *  * @return */public static HttpServletRequest getRequest() {HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();return request;}/** * SpringMvc下获取session *  * @return */public static HttpSession getSession() {HttpServletRequest request = getRequest();String tempSessionId = request.getParameter("sessionId");HttpSession session = request.getSession();String sessionId = session.getId();if(StringUtil.isNotEmpty(tempSessionId) && !tempSessionId.equals(sessionId)){sessionId = tempSessionId;if(sessionMap.containsKey(sessionId)){session = sessionMap.get(sessionId);}}if(!sessionMap.containsKey(sessionId)){sessionMap.put(sessionId, session);}return session;}private static final Map<String, HttpSession> sessionMap = new HashMap<String, HttpSession>();public static HttpSession getSession(String sessionId){HttpSession session = sessionMap.get(sessionId);return session == null ? getSession() : session;}public static void removeSession(String sessionId){if(sessionMap.containsKey(sessionId)){sessionMap.remove(sessionId);}}}