我正在尝试发送POSTHTTP POST请求，以便使用其API（创建新的“订阅者”）将联系人信息发送到邮件交换服务器。我正在使用Java和java.util.HttpURLConnection。
当我尝试签名连接时，我得到一个空引用异常。如果我在添加setRequestProperty标头之前尝试对连接进行签名，我将从服务器获得无效签名响应。
使用具有相同通用程序的GET请求 - 这意味着，据我所知，我的签名方法（和键值等）是正常的。
我正在尝试使用的服务有一些可用的“SDK”，用.NET编写。我没有尝试使用它，但我相信它可以工作（他们宣布如此）。
我试图复制他们的程序。您可以在下面找到我的代码，按照他们的代码：
private static HttpURLConnection createAndSendOAuthPostRequestWithParams () throws MalformedURLException, IOException, Exception {
String url = "http://apisdomain/v1.0/lists/354467/subscribers";
// Here I set up the values given by the provider (API's admin) which I removed from the example
String clientKey = "";
String clientSecret = "";
String userKey = "";
String userSecret = "";
String postData = "NAME=TestSubscriber&EMAIL=test@gmail.com
byte[] postBody = postData.getBytes("UTF-8");
URL apiUrl = new URL(url);
HttpURLConnection connection = (HttpURLConnection) apiUrl.openConnection();
connection.setRequestMethod("POST");
connection.setRequestProperty("content-length", String.valueOf(postBody.length));
connection.setRequestProperty("content-type", "application/x-www-form-urlencoded; charset=UTF-8");
//OAuth
OAuthConsumer consumer = new DefaultOAuthConsumer (clientKey, clientSecret);
//consumer.setAdditionalParameters(parameters);
consumer.setTokenWithSecret(userKey, userSecret);
HttpRequest httpReq = consumer.sign(connection); //Where the exception occurs
if (!postBody.toString().isEmpty()) {
connection.setDoOutput(true);
try (DataOutputStream outputStream = new DataOutputStream(connection.getOutputStream())) {
outputStream.write(postBody);
outputStream.flush();
}
}
return connection;
}
从他们的SDK：
using System.Text;
namespace ResponderSDK
{
using OAuth;
using System;
using System.Collections.Generic;
using System.Net;
using System.IO;
class ResponderOAuth
{
/* Contains the last HTTP status code returned. */
public HttpStatusCode http_code;
/* Contains the last API call. */
public string url;
/* Set up the API root URL. */
public string host = "http://api.responder.co.il/v1.0/";
/* Set timeout default. */
public int timeout = 3000;
/* Set connect timeout. */
public int connect_timeout = 30;
/* Verify SSL Cert. */
public bool ssl_verifypeer = false;
/* Response format. */
public string format = "json";
/* Contains the last HTTP headers returned. */
public string http_info;
/* Set the useragent. */
public string useragent = "ResponderOAuth v0.1-beta";
/*debug info*/
public string headers_string;
public string base_string;
public string post_string;
/* Signature */
private OAuthSignatureMethod_HMAC_SHA1 signature;
/* OAuthConsumer */
private OAuthConsumer consumer;
/* Token */
private OAuthToken token;
public ResponderOAuth(string consumer_key, string consumer_secret, string oauth_token = null, string oauth_token_secret = null)
{
this.signature = new OAuthSignatureMethod_HMAC_SHA1();
this.consumer = new OAuthConsumer(consumer_key, consumer_secret);
if (!String.IsNullOrEmpty(oauth_token) && !String.IsNullOrEmpty(oauth_token_secret))
{
this.token = new OAuthToken(oauth_token, oauth_token_secret);
}
else
{
this.token = null;
}
}
public string http_request(string url, string method = "GET", ParametersArray parameters = null)
{
method = method.ToUpper();
if (url.LastIndexOf("https://") != 0 && url.LastIndexOf("http://") != 0)
{
url = String.Format("{0}{1}", this.host, url);
}
if (method.Equals("GET"))
parameters = null;
OAuthRequest request = OAuthRequest.from_consumer_and_token(this.consumer, this.token, method, url, parameters);
request.sign_request(this.signature, this.consumer, this.token);
this.base_string = request.base_string;
if (method.Equals("GET"))
return this.http(request.to_url(), "GET", request.to_header(), null);
else
return this.http(request.get_normalized_http_url(), method, request.to_header(), request.to_postdata());
}
private string http(string url, string method, WebHeaderCollection headers, string data = null)
{
List<string> new_http_info = new List<string>();
ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(AcceptAllCertifications);
HttpWebRequest request = null;
if (!method.Equals("DELETE"))
request = (HttpWebRequest)WebRequest.Create(url);
else
{
if (!String.IsNullOrEmpty(data))
{
url = String.Format("{0}?{1}", url, data);
}
request = (HttpWebRequest)WebRequest.Create(url);
}
/* WebRequest settings */
((HttpWebRequest)request).ProtocolVersion = System.Net.HttpVersion.Version10;
((HttpWebRequest)request).UserAgent = this.useragent;
((HttpWebRequest)request).ContinueTimeout = this.connect_timeout;
((HttpWebRequest)request).Timeout = this.timeout;
((HttpWebRequest)request).Headers = headers;
((HttpWebRequest)request).UseDefaultCredentials = true;
((HttpWebRequest)request).PreAuthenticate = true;
((HttpWebRequest)request).Credentials = CredentialCache.DefaultCredentials;
this.headers_string = headers.ToString();
this.post_string = data;
byte[] dataByteArray = null;
if ((!String.IsNullOrEmpty(data) && method.Equals("POST")) || method.Equals("PUT"))
{
((HttpWebRequest)request).ContentType = "application/x-www-form-urlencoded";
System.Text.Encoding encoding = System.Text.Encoding.UTF8;
dataByteArray = encoding.GetBytes(data);
((HttpWebRequest)request).ContentLength = dataByteArray.Length;
((HttpWebRequest)request).Expect = "";
}
switch (method)
{
case "POST":
((HttpWebRequest)request).Method = "POST";
if (!String.IsNullOrEmpty(data))
{
Stream dataPost = request.GetRequestStream();
dataPost.Write(dataByteArray, 0, dataByteArray.Length);
dataPost.Close();
}
break;
case "PUT":
((HttpWebRequest)request).Method = "PUT";
if (!String.IsNullOrEmpty(data))
{
Stream dataPost = request.GetRequestStream();
dataPost.Write(dataByteArray, 0, dataByteArray.Length);
dataPost.Close();
}
break;
case "DELETE":
((HttpWebRequest)request).Method = "DELETE";
break;
}
WebResponse response = request.GetResponse();
this.http_code = ((HttpWebResponse)response).StatusCode;
// Get the stream containing content returned by the server.
Stream dataStream = response.GetResponseStream();
// Open the stream using a StreamReader for easy access.
StreamReader reader = new StreamReader(dataStream);
// Read the content.
return reader.ReadToEnd();
}
}
}
答案 0 :(得分：0)
如果输入的String格式为json，则可以将content-type更改为“application / json”，并在添加setRequestProperty标题后尝试登录。