POST using jersey

Client client = ClientBuilder.newClient();
WebTarget target = client.target("target").path("path_text");;
              //path is optional

Form form = new Form();
form.param("action", "login");
form.param("lgname", "login_id");
form.param("lgpassword", "lgin_pass");
form.param("format", "json");

Response response = target.request().post(Entity.form(form));