Spring mvc PathVariable

Question

Can you give me a brief explanation and a sample in using  PathVariable in spring mvc  Please include on how you type the url  I m struggling in getting the right url to show the jsp page  Thanks

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Annotation which indicates that a method parameter should be bound to a URI template variable  Supported for RequestMapping annotated handler methods    RequestMapping value     download  documentId    method   RequestMethod GET  public ModelAndView download  PathVariable int documentId        ModelAndView mav   new ModelAndView        Document document    documentService fileDownload documentId        mav addObject  downloadDocument   document       mav setViewName  download         return mav

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suppose you want to write a url to fetch some order  you can say  www mydomain com order 123   where 123 is orderId   So now the url you will use in spring mvc controller would look like   order  orderId    Now order id can be declared a path variable   RequestMapping value      order  orderId    method RequestMethod GET  public String getOrder  PathVariable String orderId     fetch order     if you use url www mydomain com order 123  then orderId variable will be populated by value 123 by spring  Also note that PathVariable differs from requestParam as pathVariable is part of URL  The same url using request param would look like  www mydomain com order orderId 123  API DOC  Spring Official Reference

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If you have url with path variables  example www myexampl com item 12 update where 12 is the id and create is the variable you want to use for specifying your execution for instance in using a single form to do an update and create  you do this in your controller       PostMapping value     item  id   method        public String getForm  PathVariable  id   String itemId              PathVariable  method   String methodCall   Model model         if methodCall equals  create                   logic              if methodCall equals  update                   logic                return  path to your form

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Have a look at the below code snippet     RequestMapping value   Add  type    public ModelAndView addForm  PathVariable String type        ModelAndView modelAndView   new ModelAndView        modelAndView setViewName  addContent        modelAndView addObject  typelist  contentPropertyDAO getType          modelAndView addObject  property  contentPropertyDAO get type 0         return modelAndView      Hope it helps in constructing your code

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Let us assume you hit a url as www example com test 111   Now you have to retrieve value 111  which is dynamic  to your controller method  At time you ll be using  PathVariable as follows     RequestMapping value      test  testvalue    method RequestMethod GET  public void test  PathVariable String testvalue     you can use test value here     SO the variable value is retrieved from the url

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PathVariable used to fetch the value from URL   for example  To get some question   www stackoverflow com questions 19803731   Here some question id is passed as a parameter in URL  Now to fetch this value in controller all you have to do is just to pass  PathVariable in the method parameter   RequestMapping value      questions  questionId    method RequestMethod GET      public String getQuestion  PathVariable String questionId         return question details

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have a look at the below code snippet    RequestMapping value    edit htm   method   RequestMethod GET       public ModelAndView edit  RequestParam  id   String id  throws Exception           ModelMap modelMap   new ModelMap            modelMap addAttribute  user   userinfoDao findById id            return new ModelAndView  edit   modelMap                 If you want the complete project to see how it works then download it from below link -  UserInfo Project on GitLab

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It is one of the annotation used to map handle dynamic URIs  You can even specify a regular expression for URI dynamic parameter to accept only specific type of input   For example  if the URL to retrieve a book using a unique number would be   URL http   localhost 8080 book 9783827319333   The number denoted at the last of the URL can be fetched using  PathVariable as shown    RequestMapping value   book  ISBN    method  RequestMethod GET   public String showBookDetails  PathVariable  ISBN   String id   Model model    model addAttribute  ISBN   id    return  bookDetails        In short it is just another was to extract data from HTTP requests in Spring

[spring-mvc] Spring mvc @PathVariable

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