Jersey client: How to add a list as query parameter

Jersey client: How to add a list as query parameter

In Jersey, you can add a list as a query parameter by using the javax.ws.rs.core.MultivaluedMap interface to represent multiple query parameters with the same name. Each entry in the map corresponds to a query parameter key-value pair. You can create a MultivaluedMap and add the list of values to it, and then use it as a query parameter in your client request.

Here's an example of how to do it:

import javax.ws.rs.client.Client; import javax.ws.rs.client.ClientBuilder; import javax.ws.rs.client.WebTarget; import javax.ws.rs.core.MultivaluedHashMap; import javax.ws.rs.core.MultivaluedMap; import javax.ws.rs.core.Response; public class JerseyClientWithListQueryParam { public static void main(String[] args) { // Create a Jersey Client Client client = ClientBuilder.newClient(); // Create a target web resource WebTarget target = client.target("http://example.com/api/resource"); // Create a MultivaluedMap to represent the query parameters MultivaluedMap<String, String> queryParams = new MultivaluedHashMap<>(); // Add a list of values for the "paramName" query parameter queryParams.put("paramName", List.of("value1", "value2", "value3")); // Add more query parameters if needed // queryParams.put("otherParam", List.of("valueA", "valueB")); // Build the final request URL with the query parameters target = target.queryParams(queryParams); // Send the GET request Response response = target.request().get(); // Process the response as needed // ... // Close the Jersey Client client.close(); } }

In this example:

  1. We create a Jersey client using ClientBuilder.

  2. We create a WebTarget representing the resource you want to access.

  3. We create a MultivaluedMap<String, String> called queryParams to represent the query parameters. The key ("paramName" in this case) corresponds to the query parameter name, and the value is a list of values associated with that parameter.

  4. We add a list of values to the queryParams map using the put method. You can add more query parameters in a similar way.

  5. We use the target.queryParams(queryParams) method to build the final URL with the query parameters.

  6. We send the GET request to the target resource using target.request().get().

Make sure to replace "http://example.com/api/resource" with the actual URL of the resource you want to access and adjust the query parameter names and values accordingly.

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