Sping,Hibernate中跨请求传递消息

在项目中使用注解url进行访问事用到了redirect，结果发现其信息就丢失了，其解决方案如下：

package com.founder.bcimp.core.filter;import java.util.HashMap;import java.util.Map;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpSession;import org.springframework.context.support.DelegatingMessageSource;import org.springframework.web.servlet.support.RequestContextUtils;public final class FlashScope {static final String FLASH_SCOPE_ATTRIBUTE = FlashScope.class.getName();@SuppressWarnings("unchecked")public static Map<String, Object> getCurrent(HttpServletRequest request) {HttpSession session = request.getSession(); Map flash = (Map) session.getAttribute(FLASH_SCOPE_ATTRIBUTE);if (flash == null) {flash = new HashMap();session.setAttribute(FLASH_SCOPE_ATTRIBUTE, flash);}return flash;}private FlashScope() {}/** * Gets the international message *  * @param request HttpServletRequest * @param messageSource DelegatingMessageSource * @param key String * @return the international message * @author Jiang Haiying */private static String getLocalMessage(HttpServletRequest request, DelegatingMessageSource messageSource, String key) {String message = messageSource.getMessage(key, null, RequestContextUtils.getLocale(request));return message;}/** * Gets the international message *  * @param request HttpServletRequest * @param messageSource DelegatingMessageSource * @param key String * @author Jiang Haiying */public static void internationalMessage(HttpServletRequest request, DelegatingMessageSource messageSource, String message) {FlashScope.getCurrent(request).put("message", getLocalMessage(request, messageSource, message));}}package com.founder.bcimp.core.filter;import java.io.IOException;import java.util.Map;import javax.servlet.FilterChain;import javax.servlet.ServletException;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import org.springframework.web.filter.OncePerRequestFilter;public class FlashScopeFilter extends OncePerRequestFilter {@Override@SuppressWarnings("unchecked")protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)throws ServletException, IOException {HttpSession session = request.getSession(false);if (session != null) {Map<String, ?> flash = (Map<String, ?>) session.getAttribute(FlashScope.FLASH_SCOPE_ATTRIBUTE);if (flash != null) {for (Map.Entry<String, ?> entry : flash.entrySet()) {Object currentValue = request.getAttribute(entry.getKey());if (currentValue == null) {request.setAttribute(entry.getKey(), entry.getValue());}}session.removeAttribute(FlashScope.FLASH_SCOPE_ATTRIBUTE);}}filterChain.doFilter(request, response);}}

其使用案例如下：

@RequestMapping(value = "/register", method = RequestMethod.POST)public String register(CRSCompound compound, Integer compoundSaltId, Integer notebookId,Integer unitsId, Integer projectId, Integer submitterId, Integer saltCoeff,Integer appearanceId, HttpServletRequest request, ModelMap model){String forward = "redirect:/crs/compound/";String message = "bcimp.save.success.message";if (compound.getId() != null) {message = "bcimp.edit.success.message";}try {if(compoundService.registerCompound(compound) == null && compound.getId() == null) {message = "bcimp.save.failure.message";}if(compoundService.registerCompound(compound) == null && compound.getId() != null) {message = "bcimp.edit.failure.message";}} catch (LogicException e) {logger.error(e.getMessage(), e);}if (compound.getId() != null) {forward = forward + compound.getId();} else {//TODO//registration failed}FlashScope.internationalMessage(request, messageSource, message);return forward;}