Access all @RequestHeader key value as Map in our Spring controller

Question

I am trying to find way through which, I can populate all Key values from @RequestHeader annotation to a Map. I tried to Google it but all I can find is a way to map each key value to one parameter.

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class HelloController {

    @RequestMapping(value = "/hello.htm")
    public String hello(@RequestHeader(value="User-Agent") String userAgent)

        //..
    }
}

But I want to achieve something like this.

@RequestHeader Map headerParam;

So that I can traverse the Map and use all header values as required.

Salado

Have you actually tried it with a map... (and have read the original documentation ). – Particiaparticipant

@M.Deinum, thanks for pointing out, I missed that somehow, Documentation seems clear. – Salado

Answer 1

You can achieve it as follow-

@RequestMapping(value = "/hello.htm")
public String hello(@RequestHeader HttpHeaders httpHeaders){
    Map<String,String> headerMap=httpHeaders.toSingleValueMap();
    //TODO httpHeaders will have many methods
}

I hope it will help you. Thanks.

Victual

Do you know what kind of map does Spring create? a hash or TreeMap? – Filth

Answer 2

If you use spring boot below mapping would work

@RequestHeader Map<String, String> headers

@PostMapping(value = "/customer", produces = { "application/json" })
ResponseEntity<String> findName(@RequestHeader Map<String, String> headers) {

}

Mcclendon

Do you know what kind of map does Spring create? a hash or TreeMap? – Filth

Answer 3

You can simply use below code.

@RequestMapping(value = "/hello.htm")
public String hello(@RequestHeader Map<String,String> headersMap){
    // Use the parameter **headersMap.get(<Key>)** to access the values
}

Pringle