java - UnknownHostException 尝试通过 Ektorp 连接到 Cloudant DB

Question

这不是点击应该如何使用 Ektorp 连接到托管的 Cloudant 数据库.我通过新的 m2eclipse 在 Eclipse 中使用 Ektorp 1.1 Maven 集成(非常棒)。除了 javadocs，我正在努力寻找好的 CouchDB/Cloudant/Ektorp 文档。

我正在尝试从他们的 main page 中获取示例 Ektorp API 示例工作:

HttpClient httpClient = new StdHttpClient.Builder()
                                    .host("localhost")
                                    .port(5984)
                                    .build();

CouchDbInstance dbInstance = new StdCouchDbInstance(httpClient);
CouchDbConnector db = new StdCouchDbConnector("mydatabase", dbInstance);

db.createDatabaseIfNotExists();

无论我使用什么来构建 httpClient，我总是会收到下面的 UnknownHostException 错误。我已经为主机尝试了这些 URL:https/http://cloudant.com/db/_session 和 https/http://[username].cloudant.com

端口号呢？用户名和密码是否应包含在 StdHttpClient.Builder() 中？

这是完整的错误 - 它在 createDatabaseIfNotExists() 调用中失败，但我不确定 CouchDbConnector 变量是否正确。

Exception in thread "main" org.ektorp.DbAccessException: java.net.UnknownHostException: https://cloudant.com/db/_session
    at org.ektorp.util.Exceptions.propagate(Exceptions.java:19)
    at org.ektorp.http.StdHttpClient.executeRequest(StdHttpClient.java:104)
    at org.ektorp.http.StdHttpClient.get(StdHttpClient.java:42)
    at org.ektorp.http.RestTemplate.get(RestTemplate.java:21)
    at org.ektorp.impl.StdCouchDbInstance.getAllDatabases(StdCouchDbInstance.java:61)
    at org.ektorp.impl.StdCouchDbConnector.createDatabaseIfNotExists(StdCouchDbConnector.java:256)
    at com.codegouge.examples.App.main(App.java:30)
Caused by: java.net.UnknownHostException: https://cloudant.com/db/_session
    at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
    at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:850)
    at java.net.InetAddress.getAddressFromNameService(InetAddress.java:1201)
    at java.net.InetAddress.getAllByName0(InetAddress.java:1154)
    at java.net.InetAddress.getAllByName(InetAddress.java:1084)
    at java.net.InetAddress.getAllByName(InetAddress.java:1020)
    at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:126)
    at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:149)
    at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:108)
    at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:415)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:641)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:576)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:554)
    at org.ektorp.http.StdHttpClient.executeRequest(StdHttpClient.java:96)

Answer 1

所以我做错了几件事。使用 SSL requires additional parameters .另外，Ektorp 1.1.1 includes SSL-related bug fixes到 1.1.0。所以这是我最终的 HttpClient 构造函数:

HttpClient httpClient = new StdHttpClient.Builder()
        .host("[username].cloudant.com")
        .port(443)
        .username("[username]")
        .password("[password]")
        .enableSSL(true)
        .relaxedSSLSettings(true)
        .build();

此外，请务必更新 pom.xml 中 ektorp 的依赖项以查找版本“1.1.1”。我有一篇涵盖此练习的博客文章 here如果有兴趣。