How do you map multiple query parameters to the fields of a bean on Jersey GET request?

Question

A service class has a @GET operation that accepts multiple parameters. These parameters are passed in as query parameters to the @GET service call.

Answer 1

You can create a custom Provider.

@Provider
@Component
public class RequestParameterBeanProvider implements MessageBodyReader
{
    // save the uri
    @Context
    private UriInfo uriInfo;

    // the list of bean classes that need to be marshalled from
    // request parameters
    private List paramBeanClassList;

    // list of enum fields of the parameter beans
    private Map enumFieldMap = new HashMap();

    @Override
    public boolean isReadable(Class type, Type genericType, Annotation[] annotations, MediaType mediaType)
    {
        return paramBeanClassList.contains(type);
    }

    @Override
    public Object readFrom(Class type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap httpHeaders, InputStream entityStream) throws IOException, WebApplicationException
    {
        MultivaluedMap params = uriInfo.getQueryParameters();

        Object newRequestParamBean;
        try
        {
            // Create the parameter bean
            newRequestParamBean = type.newInstance();

            // Populate the parameter bean properties
            for (Entry> param : params.entrySet())
            {
                String key = param.getKey();
                Object value = param.getValue().iterator().next();

                // set the property
                BeanUtils.setProperty(newRequestParamBean, key, value);
            }
        }
        catch (Exception e)
        {
            throw new WebApplicationException(e, 500);
        }

        return newRequestParamBean;
    }

    public void setParamBeanClassList(List paramBeanClassList)
    {
        this.paramBeanClassList = paramBeanClassList;

    }