Jersey client How to add a list as query parameter

Question

I m creating a Jersey client for a GET service that has a List as query parameter  According to the documentation  it s possible to have a List as a query parameter  this information is also at  QueryParam javadoc   check it out   In general the Java type of the method parameter may   Be a primitive type  Have a constructor that accepts a single String argument  Have a static method named valueOf or fromString that accepts a single String argument  see  for example  Integer valueOf String  and java util UUID fromString String    or Be List  Set or SortedSet  where T satisfies 2 or 3 above  The resulting collection is read-only   Sometimes parameters may contain more than one value for the same name  If this is the case then types in 4  may be used to obtain all values   However  I can t figure out how to add a List query parameter using Jersey client  I understand alternative solutions are   Use POST instead of GET  Transform the List into a JSON string and pass it to the service   The first one is not good  because the proper HTTP verb for the service is GET  It is a data retrieval operation  The second will be my option if you can t help me out     I m also developing the service  so I may change it as needed  Thanks  Update Client code  using json  Client client   Client create     WebResource webResource   client resource uri toString      SearchWrapper sw   new SearchWrapper termo  pagina  ordenacao  hits  SEARCH VIEW  navegadores    MultivaluedMap lt String  String gt  params   new MultivaluedMapImpl    params add  quot user quot   user toUpperCase      params add  quot searchWrapperAsJSON quot    new Gson    toJson sw     ClientResponse clientResponse   webResource  path  quot  listar quot                                                queryParams params                                               header HttpHeaders AUTHORIZATION  AuthenticationHelper getBasicAuthHeader                                                 get ClientResponse class    SearchResultWrapper busca   clientResponse getEntity new GenericType lt SearchResultWrapper gt

User · Answer

i agree with you about alternative solutions which you mentioned above

1. Use POST instead of GET;
2. Transform the List into a JSON string and pass it to the service.

and its true that you can't add List to MultiValuedMap because of its impl class MultivaluedMapImpl have capability to accept String Key and String Value. which is shown in following figure

enter image description here

still you want to do that things than try following code.

Controller Class

package net.yogesh.test;

import java.util.List;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;

import com.google.gson.Gson;

@Path("test")
public class TestController {
       @Path("testMethod")
       @GET
       @Produces("application/text")
       public String save(
               @QueryParam("list") List<String> list) {

           return  new Gson().toJson(list) ;
       }
}

Client Class

package net.yogesh.test;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import javax.ws.rs.core.MultivaluedMap;

import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.WebResource;
import com.sun.jersey.api.client.config.ClientConfig;
import com.sun.jersey.api.client.config.DefaultClientConfig;
import com.sun.jersey.core.util.MultivaluedMapImpl;

public class Client {
    public static void main(String[] args) {
        String op = doGet("http://localhost:8080/JerseyTest/rest/test/testMethod");
        System.out.println(op);
    }

    private static String doGet(String url){
        List<String> list = new ArrayList<String>();
        list = Arrays.asList(new String[]{"string1,string2,string3"});

        MultivaluedMap<String, String> params = new MultivaluedMapImpl();
        String lst = (list.toString()).substring(1, list.toString().length()-1);
        params.add("list", lst);

        ClientConfig config = new DefaultClientConfig();
        com.sun.jersey.api.client.Client client = com.sun.jersey.api.client.Client.create(config);
        WebResource resource = client.resource(url);

        ClientResponse response = resource.queryParams(params).type("application/x-www-form-urlencoded").get(ClientResponse.class);
        String en = response.getEntity(String.class);
        return en;
    }
}

hope this'll help you.

User · Answer

GET does support List of Strings  Setup   Java   1 7  Jersey version   1 9  Resource    Path   v1 test     Subresource      receive List of Strings  GET  Path   receiveListOfStrings   public Response receiveListOfStrings  QueryParam  list   final List lt String gt  list       log info  receieved list of size   list size         return Response ok   build        Jersey testcase   Test public void testReceiveListOfStrings   throws Exception       WebResource webResource   resource        ClientResponse responseMsg   webResource path   v1 test receiveListOfStrings                queryParam  list    one                queryParam  list    two                queryParam  list    three                get ClientResponse class       Assert assertEquals 200  responseMsg getStatus

User · Answer

If you are sending anything other than simple strings I would recommend using a POST with an appropriate request body  or passing the entire list as an appropriately encoded JSON string  However  with simple strings you just need to append each value to the request URL appropriately and Jersey will deserialize it for you  So given the following example endpoint    Path   service echo   public class MyServiceImpl       public MyServiceImpl             super                GET      Path   withlist        Produces MediaType TEXT PLAIN      public Response echoInputList  QueryParam  list   final List lt String gt  inputList            return Response ok inputList  build              Your client would send a request corresponding to      GET http   example com services echo list Hello amp list Stay amp list Goodbye   Which would result in inputList being deserialized to contain the values  Hello    Stay  and  Goodbye

User · Answer

One could use the queryParam method  passing it parameter name and an array of values      public WebTarget queryParam String name  Object    values    Example  jersey-client 2 23 2       WebTarget target   ClientBuilder newClient   target URI create  quot http   localhost quot         target path  quot path quot                queryParam  quot param name quot   Arrays asList  quot paramVal1 quot    quot paramVal2 quot   toArray                 request   get     This will issue request to following URL      http   localhost path param name paramVal1 amp param name paramVal2

User · Answer

GET Request with JSON Query Param  package com rest jersey jerseyclient  import com sun jersey api client Client  import com sun jersey api client ClientResponse  import com sun jersey api client WebResource   public class JerseyClientGET        public static void main String   args            try                               String BASE URI  http   vaquarkhan net 8080 khanWeb                              Client client   Client create                    WebResource webResource   client resource BASE URI                ClientResponse response   webResource accept  application json   get ClientResponse class                  if  response getStatus      200                   throw new RuntimeException  Failed   HTTP error code                       response getStatus                                  String output   webResource path   msg sms   queryParam  search      name     vaquar     surname     khan     ext     2020     age     34       get String class                 String output   response getEntity String class                System out println  Output from Server       n                System out println output                                       catch  Exception e                 e printStackTrace                                    Post Request    package com rest jersey jerseyclient   import com rest jersey dto KhanDTOInput  import com sun jersey api client Client  import com sun jersey api client ClientResponse  import com sun jersey api client WebResource  import com sun jersey api client config ClientConfig  import com sun jersey api client config DefaultClientConfig  import com sun jersey api json JSONConfiguration   public class JerseyClientPOST        public static void main String   args            try                KhanDTOInput khanDTOInput   new KhanDTOInput  vaquar    khan    20    E   null   2222    8308511500                                       ClientConfig clientConfig   new DefaultClientConfig                 clientConfig getFeatures   put  JSONConfiguration FEATURE POJO MAPPING  Boolean TRUE                Client client   Client create clientConfig                      final HTTPBasicAuthFilter authFilter   new HTTPBasicAuthFilter username  password                     client addFilter authFilter                     client addFilter new LoggingFilter                                 WebResource webResource   client                      resource  http   vaquarkhan net 12221 khanWeb messages sms api v1 userapi                   ClientResponse response   webResource accept  application json                    type  application json   put ClientResponse class  khanDTOInput                 if  response getStatus      200                    throw new RuntimeException  Failed   HTTP error code      response getStatus                                String output   response getEntity String class                System out println  Server response       n                System out println output              catch  Exception e                 e printStackTrace

[java] Jersey client: How to add a list as query parameter

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