java - 如何让RESTful java客户端在Openstack上发送GET/POST请求？

Question

我想发出 POST 请求以从 Openstack 获取 token 。我可以通过输入 url 使用 Mozilla 上的插件来执行此操作:“http://********/v2.0/tokens”和数据为

{
    "auth": {
        "tenantName": "admin",
        "passwordCredentials": {
            "username": "xxxxxx",
            "password": "xxxxxx"
        }
    }
}

如何用JAVA程序做同样的事情？到目前为止我已经尝试过以下代码，但没有成功。

package rest.openstack;

    import java.io.BufferedReader;
    import java.io.IOException;
    import java.io.InputStreamReader;
    import java.net.HttpURLConnection;
    import java.net.MalformedURLException;
    import java.net.URL;

    public class NetClientGet {

        // http://localhost:8080/RESTfulExample/json/product/get
        public static void main(String[] args) {

          try {

            URL url = new URL("http://***.**.**.**:5000/v2.0/tenants/");  //url for openstack
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");
            conn.setRequestProperty("Accept", "application/json");

            if (conn.getResponseCode() != 200) {
                throw new RuntimeException("Failed : HTTP error code : "
                        + conn.getResponseCode());
            }

            BufferedReader br = new BufferedReader(new InputStreamReader(
                (conn.getInputStream())));

            String output;
            System.out.println("Output from Server .... \n");
            while ((output = br.readLine()) != null) {
                System.out.println(output);
            }

            conn.disconnect();

          } catch (MalformedURLException e) {

            e.printStackTrace();

          } catch (IOException e) {

            e.printStackTrace();

          }

        }

    }

Answer 1

我更喜欢 Jersey API 进行 REST 调用；

下面是获取POST实体中指定用户的token；

String postEntity = "yourJson";
JerseyClient jerseyClient = JerseyClientBuilder.createClient();
JerseyWebTarget jerseyTarget = jerseyClient.target("http://***.**.**.**:****/v2.0/tokens");
JerseyInvocation.Builder jerseyInvocation = jerseyTarget.request("application/json");
jerseyInvocation.header("Context-type", "application/json");
Response response = jerseyInvocation.post(Entity.entity(postEntity, MediaType.APPLICATION_JSON), Response.class);

然后您可以使用一些解析器(例如 com.google.gson.JsonParser)来解析您的实体。

JsonParser jsonParser = new JsonParser();
String responseEntity = jsonParser.parse(response.readEntity(String.class));

之后，对于每个请求，您需要将 X-Auth-Token 应用于 REST header ，以便对服务进行身份验证。

jerseyInvocation.header("X-Auth-Token",token);