如何重定向形成控制器和JSP获得价值

Question

http://localhost:8080/LACASServer/message.jsp?forgotUser=Mail+has+been+sent+to+your+mail+address 

这里forgotUser是地图的关键，我在一个控制器的方法，它重定向到message.jsp设置，现在，我怎么使用这个地图信息.jap显示该地图的值。我使用JSTL库

CONTROLER方法为：

@RequestMapping(value = "/forgotPWD",params="username", method = RequestMethod.POST) 
      public String forgotPassword(@RequestParam(value = "username", required = false) String username,Map<String, Object> map) { 
       System.out.println("forgotPasswordUser"+username); 
       ResetPasswordLog resetPasswordLog; 
       User forgotPasswordUser = usersService.findUser(username); 
       map.put("forgotUser","Mail has been sent to your mail address"); 
       if(forgotPasswordUser==null){ 
        return "redirect:/login.jsp?login_error=1"; 
       } 
       else 
       { 



        Integer uid=forgotPasswordUser.getId(); 
        resetPasswordLog= usersService.setTempHash(uid); 
        String TEMPHASH= resetPasswordLog.getTempHash(); 
        String url=Utility.serverURL+"forgot/index?uid="+uid+"&token="+TEMPHASH; 
        System.out.println(url); 
        System.out.println(Utility.mailResetSubject); 
        mailSender.sendMail(Utility.mailFrom,"[email protected]",Utility.mailResetSubject, url); 
        return "redirect:/message.jsp"; 


       } 

      } 

Answer 1

你需要你的控制器的方法（如上所示）来指定“视图”本身（而不是使用重定向，因为它目前如此） 。所以返回值应该是一个字符串，对应于message.jsp的视图名称。然后，您可以将该地图添加到模型中，并且它将在JSP中可用。例如。

@RequestMapping(value = "/forgotPWD",params="username", method = RequestMethod.POST) 
public String forgotPassword(@RequestParam(value = "username", required = false) String username, 
     Map<String, Object> map, Model model) { 
    [snip] 
    map.put("forgotUser","Mail has been sent to your mail address"); 
    model.addAttribute("userMap", map); 
    [snip] 
    return "message.jsp"; // or just "message" depending on Spring settings 
} 

然后在你的JSP访问通过JSTL地图：$ {} userMap.forgotUser