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

我想发一个POST请求来从Openstack获取令牌。 我可以通过输入url：“http：//*******/v2.0/tokens”和数据使用Mozilla上的插件来实现

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

如何通过JAVA程序做到这一点？ 直到现在我已经尝试了以下代码，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用于REST调用;

下面是获取POST实体中指定用户的令牌;

 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com.google.gson.JsonParser等解析器解析您的实体。

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

在此之后，对于每个请求，您需要将X-Auth-Token应用于REST标头，以便对服务进行身份validation。

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