spring mvc3中的addFlashAttribute步骤
spring mvc3中的addFlashAttribute方法记得在spring mvc2中,当保存POJO到数据库后,要返回成功页面,如果这
spring mvc3中的addFlashAttribute方法
记得在spring mvc2中,当保存POJO到数据库后,要返回成功页面,如果这个时候要带点信息, 则要这样: Java代码:
//第三个参数(UserModel user)默认为绑定对象 @RequestMapping(value = "/user/save", method = RequestMethod.POST) public ModelAndView saveUser(HttpServletRequest request, HttpServletResponse response,UserModel user) throws Exception { ModelAndView mv = new ModelAndView("/user/save/result");//默认为forward模式 // ModelAndView mv = new ModelAndView("redirect:/user/save/result");//redirect模式 mv.addObject("message","保存用户成功!"); return mv; }
而在spring mvc 3.1后,可以这样
Java代码: @RequestMapping(value = "/user/save", method = RequestMethod.POST) public ModelAndView saveUser(UserModel user, RedirectAttributes redirectAttributes) throws Exception { redirectAttributes.addFlashAttribute("message", "保存用户成功!");//使用addFlashAttribute,参数不会出现在url地址栏中 return "redirect:/user/save/result"; }
来个稍微完整点的例子,首先是一个表单,在其中填入一些信息:
Java代码: <form:form id="myform" action="saveUserDetails.action" method="POST" commandName="user"> <form:input type="text" name="firstName" path="firstName"/> <form:input type="text" name="lastName" path="lastName"/> <form:input type="text" name="email" path="email"/> <input type="submit" value="submit"> </form:form>
则在controller中,可以这样:
Java代码: @RequestMapping(value="/saveUserDetails.action", method=RequestMethod.POST) public String greetingsAction(@Validated User user,RedirectAttributes redirectAttributes){ someUserdetailsService.save(user); redirectAttributes.addFlashAttribute("firstName", user.getFirstName()); redirectAttributes.addFlashAttribute("lastName", user.getLastName()) return "redirect:success.html"; } success.html: <div> <h1>Hello ${firstName} ${lastName}. Your details stored in our database.</h1> </div><br>
但如果F5的时候,会发现参数丢失,因为flash scope其实只支持redirect的,所以可以判断下:
Java代码: @RequestMapping(value="/success.html", method=RequestMethod.GET) public String successView(HttpServletRequest request){ Map<String,?> map = RequestContextUtils.getInputFlashMap(request); if (map!=null) return "success"; else return "redirect:someOtherView"; //給出其他提示信息 原文地址:http://www.software8.co/wzjs/java/2943.html