application参数设置与使用
web.xml中
<context-param> <param-name>1</param-name> <param-value>用户名或密码为空, 请重试!</param-value> </context-param> <context-param> <param-name>2</param-name> <param-value>用户名不存在或密码错误!</param-value> </context-param>
java中
if(tempUser == null) { // request.getSession().setAttribute("ERROR_CODE", "2");//用户名不存在或密码错误! mav = new ModelAndView("redirect:/"); mav.addObject("errorcode", "2"); return mav; }
jsp中
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String errorcode = request.getParameter("errorcode"); String str = ""; if(errorcode !=null) str = application.getInitParameter(errorcode); %> <h3 class="form-title">登录您的账号</h3> <%if (errorcode !=null) {%> <div class="alert alert-danger display-hide"> <button class="close" data-close="alert"></button> <span> <%=str%> </span> </div> <%} %>