How do I retrieve query parameters in Spring Boot

Question

I am developing a project using Spring Boot  I ve a controller which accepts GET requests   Currently I m accepting requests to the following kind of URLs      http   localhost 8888 user data 002   but I want to accept requests using query parameters      http   localhost 8888 user data 002   Here s the code of my controller    RequestMapping value   data  itemid    method   RequestMethod GET  public  ResponseBody item getitem  PathVariable  itemid   String itemid           item i   itemDao findOne itemid                     String itemname   i getItemname        String price   i getPrice        return i

User · Accepted Answer

Use  RequestParam      RequestMapping value  user   method   RequestMethod GET  public  ResponseBody Item getItem  RequestParam  data   String itemid        Item i   itemDao findOne itemid                     String itemName   i getItemName        String price   i getPrice        return i

User · Answer

I was interested in this as well and came across some examples on the Spring Boot site          get with query string parameters e g   system resource id  rtze1cd2  amp person  sam smith      so below the first query parameter id is the variable and name is the variable    id is shown below as a RequestParam      GetMapping   system resource          this is for swagger docs      ApiOperation value    Get the resource identified by id and person       ResponseEntity lt   gt  getSomeResourceWithParameters  RequestParam String id   RequestParam  person   String name             InterestingResource resource   getMyInterestingResourc id  name           logger info  Request to get an id of   id   with a name of person    name            return new ResponseEntity lt Object gt  resource  HttpStatus OK           See here also

User · Answer

While the accepted answer by afraisse is absolutely correct in terms of using  RequestParam  I would further suggest to use an Optional lt   as you cannot always ensure the right parameter is used  Also  if you need an Integer or Long just use that data type to avoid casting types later on in the DAO    RequestMapping value   data   method   RequestMethod GET  public  ResponseBody Item getItem  RequestParam  itemid   Optional lt Integer gt  itemid         if  itemid isPresent              Item i   itemDao findOne itemid get                            return i         else

User · Answer

To accept both  PathVariable and  RequestParam in the same  user endpoint   GetMapping path     quot  user quot    quot  user  data  quot    public void user  PathVariable required false name  quot data quot   String data                    RequestParam required false  Map lt String String gt  qparams        qparams forEach  a b  - gt            System out println String format  quot  s - gt   s quot  a b                 if  data    null            System out println data            Testing with curl   curl  http   localhost 8080 user books  curl  http   localhost 8080 user book ofdreams amp name nietzsche

User · Answer

In Spring boot  2 1 6  you can use like below       GetMapping  quot  orders quot        ApiOperation value    quot retrieve orders quot   response   OrderResponse class  responseContainer    quot List quot       public List lt OrderResponse gt  getOrders               RequestParam value    quot creationDateTimeFrom quot   required   true  String creationDateTimeFrom               RequestParam value    quot creationDateTimeTo quot   required   true  String creationDateTimeTo               RequestParam value    quot location id quot   required   true  String location id                TODO             return response    ApiOperation is an annotation that comes from Swagger api  It is used for documenting the apis

[java] How do I retrieve query parameters in Spring Boot?

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