'Spring RestTemplate GET request remove empty query params

I want to make REST call using spring RestTemplate, the URL contains some optional query params. The URL looks something like

url = example.com/param1={param1}&param2={param2}

I pass params as map to restTemplate using exchange method

restTemplate.exchange(url, method, payLoad, String.class, params)

The final URL is example.com/param1=somevalue&param2= since param2 was not present in params map.

I want to remove param2 from the request, that is, the final URL should contain only param1 and URL should look like example.com/param1=somevalue

javaspring


Solution 1:[1]

You can make a class that delegates calls to UriComponentsBuilder. With a method like:

public UriBuilder queryParam(String name, String value) {

    if (!StringUtils.isEmpty(value)){
        internalBuilder.queryParam(name, value);
    }else {
        //or dont do anything
        internalBuilder.replaceQueryParam(name);
    }

    return this;
}

Solution 2:[2]

You can use the method UriComponentsBuilder.replaceQueryParam()

UriComponentsBuilder builder = UriComponentsBuilder.fromHttpUrl("example.com")
              .replaceQueryParam("param1", null)
              .replaceQueryParam("param2", "Hello");

This will output example.com?param2=Hello and ignore the param1's value

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Rodrigo Dias
Solution 2 lilalinux

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