Step1：把 B Action的信息储存到Session中去
/** * Store action messages and errors. */ protected void storeActionMessagesAndErrors() { Collection<String> actionMessages = this.getActionMessages(); if (CollectionUtils.isNotEmpty(actionMessages)) { this.setToSession(Constants.SESSION_ACTION_MESSAGES, actionMessages); } Collection<String> actionErrors = this.getActionErrors(); if (CollectionUtils.isNotEmpty(actionErrors)) { this.setToSession(Constants.SESSION_ACTION_ERRORS, this.getActionErrors()); } } /** * Set an object in the session. * * @param key * the object key * @param object * the object to set. */ protected void setToSession(String key, Object object) { ServletActionContext.getRequest().getSession() .setAttribute(key, object); }Step2:在从B Action重定向A Action的时候，在从Session中取出来
/** * Retrieve action messages. */ @SuppressWarnings("unchecked") protected void retrieveActionMessagesAndErrors() { Collection<String> actionErrorsRetrieved = (Collection<String>) this .getFromSession(Constants.SESSION_ACTION_ERRORS); Collection<String> actionMessagesRetrieved = (Collection<String>) this .getFromSession(Constants.SESSION_ACTION_MESSAGES); if (actionErrorsRetrieved != null) { Collection<String> actionErrors = this.getActionErrors(); actionErrors.addAll(actionErrorsRetrieved); this.setActionErrors(actionErrors); this.removeSession(Constants.SESSION_ACTION_ERRORS); } if (actionMessagesRetrieved != null) { Collection<String> actionMessages = this.getActionMessages(); actionMessages.addAll(actionMessagesRetrieved); this.setActionMessages(actionMessages); this.removeSession(Constants.SESSION_ACTION_MESSAGES); } } /** * * Get an object from Session. * * @param key * the object key. * @return the object. */ protected Object getFromSession(String key) { return ServletActionContext.getRequest().getSession().getAttribute(key); } /** * Removes the session. * * @param key * the key */ protected void removeSession(String key) { ServletActionContext.getRequest().getSession().removeAttribute(key); }