Question

它没有点击如何使用Ektorp连接到托管的Cloudant数据库。我通过新的m2eclipse Maven集成在Eclipse中使用Ektorp 1.1（非常好）。我很难找到除了javadocs之外的好的CouchDB / Cloudant / Ektorp文档。

我正在尝试从他们的main page获取示例Ektorp API示例：

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

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

db.createDatabaseIfNotExists();

我用什么构建httpClient并不重要，我总是得到下面的UnknownHostException错误。我已经为主机试过这些网址：https / http://cloudant.com/db/_session和https / http：// [用户名] .cloudant.com

端口号怎么样？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。此外，Ektorp 1.1.1 includes SSL-related bug fixes到1.1.0。所以这是我最后的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();

另外，请务必在pom.xml中更新ektorp的依赖项以查找版本“1.1.1”。如果感兴趣的话，我有一篇博文，内容涵盖了这个练习here。

Answer 2

您也可以使用该URL连接Ektorp：

JSONObject serviceAttr = val.getJSONObject(0);
                        JSONObject credentials = serviceAttr.getJSONObject("credentials");
                        httpClient = new StdHttpClient.Builder()
                        .url(credentials.getString("url"))
                        .build();

这是一种简单的连接方式。我找到了使用Ektorp 1.4.2进行连接的教程： http://www.ibm.com/developerworks/java/library/j-hangman-app/index.html

Answer 3

我对Ektorp不太熟悉，但你肯定需要在那里获取你的用户名/密码。我建议使用以下代码创建HttpClient：

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

我已将端口更改为443（Cloudant侦听的HTTPS的默认设置），并且我添加了用户名和密码。我没有看到任何方式让Ektorp知道您想要使用HTTPS，但幸运的是，这将在内部处理。

尝试通过Ektorp连接到Cloudant DB的UnknownHostException

3 个答案: