How I can pass a Map parameter as a GET param in url to Spring REST controller ?
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See this question, and its answers: stackoverflow.com/questions/29387877/…Ralph– Ralph2015-11-07 10:01:25 +00:00Commented Nov 7, 2015 at 10:01
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Thanks, but I know how to catch it with a POST The question was about GETalexanoid– alexanoid2015-11-07 10:03:39 +00:00Commented Nov 7, 2015 at 10:03
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2 Answers
It’s possible to bind all request parameters in a Map just by adding a Map object after the annotation:
@RequestMapping("/demo")
public String example(@RequestParam Map<String, String> map){
String apple = map.get("APPLE");//apple
String banana = map.get("BANANA");//banana
return apple + banana;
}
Request
/demo?APPLE=apple&BANANA=banana
Source -- https://reversecoding.net/spring-mvc-requestparam-binding-request-parameters/
Comments
There are different ways (but a simple @RequestParam('myMap')Map<String,String> does not work - maybe not true anymore!)
The (IMHO) easiest solution is to use a command object then you could use [key] in the url to specifiy the map key:
@Controller
@RequestMapping("/demo")
public class DemoController {
public static class Command{
private Map<String, String> myMap;
public Map<String, String> getMyMap() {return myMap;}
public void setMyMap(Map<String, String> myMap) {this.myMap = myMap;}
@Override
public String toString() {
return "Command [myMap=" + myMap + "]";
}
}
@RequestMapping(method=RequestMethod.GET)
public ModelAndView helloWorld(Command command) {
System.out.println(command);
return null;
}
}
- Request: http://localhost:8080/demo?myMap[line1]=hello&myMap[line2]=world
- Output:
Command [myMap={line1=hello, line2=world}]
Tested with Spring Boot 1.2.7
3 Comments
alexanoid
Thanks Ralph! What do you think about an approach where we will pass
@PathVariable List<String> map and map will contain something like this: 12:34,833:73,90:25 In the controller logic we can split list elements by ":" and get key/value pairs..
Ralph
Why do you want to do this, when the "save" solution is so easy? I you want to map it by your own, then you should have a look at matix variables: docs.spring.io/spring/docs/current/spring-framework-reference/… and captaindebug.com/2013/04/…
alexanoid
because currently I have a following mapping
@RequestMapping(value = "/criteria/{criteriaIds} where criteriaIds is a @PathVariable List<Long> criteriaIds. Right now I need to add double weight to some of criteriaId in criteriaIds list.