URIBuilder and list query params

Question

I'm using apache URIBuilder to build a query string for a GET method of a Rest service.

@RequestMapping(value="/remote") 
    public Return getTest(Ordine ordine) throws Exception{
        ...
    }

This is the input object:

public class Ordine{    
    private List<String> codici;
    //..get...set..
}

I cannot understand how to set this string list as query params.

I tried to set param twice:

URIBuilder builder = new URIBuilder()
                .setHost("localhost")
                .setPort(8080)
                .setScheme("http")
                .setPath("/remote")
                .setParameter("codici", codicilist.get(0))
                .setParameter("codici", codicilist.get(1));

But the first param it will be overwrite from the second. Then I tried to append [] in the param name:

URIBuilder builder = new URIBuilder()
                .setHost("localhost")
                .setPort(8080)
                .setScheme("http")
                .setPath("/remote")
                .setParameter("codici[]", codicilist.get(0))
                .setParameter("codici[]", codicilist.get(1));

But it is simply sent with name "codici[]" and the first param is overwritten. Then I tried a comma separated values:

URIBuilder builder = new URIBuilder()
                .setHost("localhost")
                .setPort(8080)
                .setScheme("http")
                .setPath("/remote")
                .setParameter("codici", String.join(",",codicilist));

But if fails... how can I set a list of param?

Answer 1

You can use addParameters method.

URIBuilder builder = new URIBuilder()
            .setHost("localhost")
            .setPort(8080)
            .setScheme("http")
            .setPath("/remote").addParameters(buildParamList())

Then get all codici parameter values with a helper method which will build a list of NameValuePair pairs.

private List<NameValuePair> buildParamList() {
    List<NameValuePair> output = new ArrayList<>();
    for (String string : codici) {
        output.add(new BasicNameValuePair("codici", string));
    }
    return output;
}

So you'll get an output similar to http://localhost:8080/remote?codici=codici1&codici=codici2&codici=codici3 given that codici list contains codici1, codici2, codici3