使用 Java 从 REST 服务读取

Question

我试图弄清楚如何从需要身份验证的 REST 源中读取数据，但运气不佳。我使用 C# 可以正常工作，如下所示：

HttpWebRequest request = (HttpWebRequest) WebRequest.Create(filename);
request.Accept = "application/xml";
request.ContentType = "application/xml";
request.KeepAlive = true;

// this part is not used until after a request is refused, but we add it anyways
CredentialCache myCache = new CredentialCache();
myCache.Add(new Uri(filename), "Basic", new NetworkCredential(username, password));
request.Credentials = myCache;

// this is how we put the uname/pw in the first request
string cre = String.Format("{0}:{1}", username, password);
byte[] bytes = Encoding.ASCII.GetBytes(cre);
string base64 = Convert.ToBase64String(bytes);
request.Headers.Add("Authorization", "Basic " + base64);

HttpWebResponse response = (HttpWebResponse) request.GetResponse();
return response.GetResponseStream();

但对于 Java，以下内容不起作用：

URL url = new URL(dsInfo.getFilename());
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setRequestProperty("Accept", "application/xml");
conn.setRequestProperty("Content-Type", "application/xml");
BASE64Encoder encoder = new BASE64Encoder();
String encodedCredential = encoder.encode( (dsInfo.getUsername() + ":" + dsInfo.getPassword()).getBytes() );
conn.setRequestProperty("Authorization", "BASIC " + encodedCredential);

conn.connect();

InputStream responseBodyStream = conn.getInputStream();

流正在返回：

Error downloading template

Packet: test_packet
Template: NorthwindXml

Error reading authentication header.

我错了什么？

谢谢-戴夫

Answer 1

在用户名/密码的编码中：

Java 使用 UTF-8 编码，并且 getBytes() 返回与本地主机编码（可能是或不是 ASCII）相对应的字节。 String 的 javadoc 为您提供更多详细信息。

在 C# 和 Java 中打印此类编码字符串的值并检查它们是否匹配。

Answer 2

答案来自 Codo 在评论中 - Basic 而不是 BASIC。