package com.test.util;

import javax.servlet.http.HttpSession;

/**
 * 操作錯誤信息的類
 * 
 * @author pwf
 * @version 1.0
 */
public class ErrorManager {

	private static final String ERRORMSG = "errorMsg";

	public ErrorManager() {
	}

	// 設置當前的錯誤信息
	public static void addErrorMessage(HttpSession session, String errorMessage) {
		session.setAttribute(ERRORMSG, errorMessage);
	}

	// 取出設置的錯誤信息
	public static String getErrorMessage(HttpSession session) {
		try {
			String errorMsg = (String) session.getAttribute(ERRORMSG);
			if (errorMsg == null) {
				errorMsg = "";
			}
			return errorMsg;
		} catch (Exception ex) {
			ex.printStackTrace();
			return "";
		} finally {
			session.setAttribute(ERRORMSG, null);
		}
	}

}