Spring MVC Controller redirect using URL parameters instead of in response

Question

I am trying to implement RESTful urls in my Spring MVC application  All is well except for handling form submissions  I need to redirect either back to the original form or to a  success  page     Controller  RequestMapping   form   public class MyController         RequestMapping method   RequestMethod GET      public String setupForm                do my stuff         return  myform               RequestMapping method   RequestMethod POST      public String processForm ModelMap model                           process form data          model addAttribute  notification    Successfully did it             return  redirect  form             However as I read in the Spring documentation  if you redirect any parameters will be put into the url  And that doesn t work for me  What would be the most graceful way around this

User · Answer

You can have processForm   return a View object instead  and have it return the concrete type RedirectView which has a parameter for setExposeModelAttributes     When you return a view name prefixed with  redirect    Spring MVC transforms this to a RedirectView object anyway  it just does so with setExposeModelAttributes to true  which I think is an odd value to default to

User · Answer

If you don t want the success message in the URL  then one option is to put it in the session  in the processForm method  and then check for it  and remove it  in the setupForm method   Edited to add  if this is a pain to do manually  then you could write a subclass of RedirectView that adds a  message  attribute and wraps the process of inserting it into the session   Not sure  though  if there s an easy way to wrap getting the message back out of the session     Honestly  I don t think there s an easy answer -- the nature of an HTTP redirect is that state isn t carried over  if you want to maintain state anyway  you re stuck with the various usual ways to maintain state in web applications  the session  a cookie  a querystring

User · Answer

This problem is caused  as others have stated  by model attributes being persisted into the query string - this is usually undesirable and is at risk of creating security holes as well as ridiculous query strings   My usual solution is to never use Strings for redirects in Spring MVC  instead use a RedirectView which can be configured not to expose model attributes  see  http   static springsource org spring docs 3 1 x javadoc-api org springframework web servlet view RedirectView html   RedirectView String url  boolean contextRelative  boolean http10Compatible  boolean exposeModelAttributes    So I tend to have a util method which does a  safe redirect  like   public static RedirectView safeRedirect String url        RedirectView rv   new RedirectView url       rv setExposeModelAttributes false       return rv      The other option is to use bean configuration XML    lt bean id  myBean  class  org springframework web servlet view RedirectView  gt      lt property name  exposeModelAttributes  value  false    gt      lt property name  url  value   myRedirect   gt   lt  bean gt    Again  you could abstract this into its own class to avoid repetition  e g  SafeRedirectView      A note about  clearing the model  - this is not the same as  not exposing the model  in all circumstances   One site I worked on had a lot of filters which added things to the model  this meant that clearing the model before redirecting would not prevent a long query string   I would also suggest that  not exposing model attributes  is a more semantic approach than  clearing the model before redirecting

User · Answer

RequestMapping path   apps add   method RequestMethod POST  public String addApps String appUrl  Model model  final RedirectAttributes redirectAttrs        if   validate appUrl            redirectAttrs addFlashAttribute  error    Validation failed              return  redirect  apps add       RequestMapping path   apps add   method RequestMethod GET  public String addAppss Model model        String error   model asMap   get  error

User · Answer

I had the same problem  solved it like this   return new ModelAndView  redirect  user list success true      And then my controller method look like this   public ModelMap list  RequestParam required false  boolean success        ModelMap mm   new ModelMap        mm put SEARCH MODEL KEY  campaignService listAllCampaigns         if success          mm put  successMessageKey    campaign form msg success        return mm      Works perfectly unless you want to send simple data  not collections let s say  Then you d have to use session I guess

User · Answer

http   jira springframework org browse SPR-6464 provided me with what I needed to get things working until Spring MVC offers the functionality  potentially in the 3 0 2 release   Although I simply implemented the classes they have temporarily and added the filter to my web application context  Works great

User · Answer

Hey you can just do one simple thing instead of using model to send parameter use HttpServletRequest object and do this  HttpServletRequest request  request setAttribute  param    value     now your parametrs will not be shown in your url header hope it works

[java] Spring MVC Controller redirect using URL parameters instead of in response

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