如何重定向形成控制器和JSP獲得價值

Question

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

這裏forgotUser是地圖的關鍵，我在一個控制器的方法，它重定向到message.jsp設置，現在，我怎麼使用這個地圖信息.jap顯示該地圖的值。我使用JSTL庫

CONTROLER方法爲：

@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,"romijain3186@gmail.com",Utility.mailResetSubject, url); 
        return "redirect:/message.jsp"; 


       } 

      } 

Answer 1

你需要你的控制器的方法（如上所示）來指定「視圖」本身（而不是使用重定向，因爲它目前如此） 。所以返回值應該是一個字符串，對應於message.jsp的視圖名稱。然後，您可以將該地圖添加到模型中，並且它將在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 
} 

然後在你的JSP訪問通過JSTL地圖：$ {} userMap.forgotUser