泽西岛REST-Client WebTarget -无法找到内容类型的MessageBodyReader

Question

是关于一个护理人员的请求。我的应用程序的用户应该能够为请求选择参数。然后，我将从响应中读取xml并使用JAXB解析它。我成功地做到了这一点：

String uri = "https://cmi.zb.uzh.ch/primo/api/oaipmh?verb=ListRecords&metadataPrefix=oai_primo&set=PRIMO&from=2020-01-22T12:39:59Z&until=2020-02-28T11:40:00Z";
            URL url = new URL(uri);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("GET");
            connection.setRequestProperty("Accept", "application/xml");

            JAXBContext jaxbContext = JAXBContext.newInstance(ObjectFactory.class);
            InputStream xml = connection.getInputStream();

            Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
            oai = (OAIPMHtype) jaxbUnmarshaller.unmarshal(xml);

但是我想动态地创建请求。有一个JSF页面，用户可以在其中输入参数。我想到了泽西客户端，因为我可以轻松地用字段替换queryParam中的String。但我不能把泽西的客户和我的解法器联系起来。

我的想法是将响应转换为输入流，并将其提供给解组器。

这是我试过的。

主要方法

public static void main(String[] args) {
        ClientConfig config = new ClientConfig();
        Client client = ClientBuilder.newClient(config);
            WebTarget target = client.target("https://cmi.zb.uzh.ch/primo/api/oaipmh");
             target.queryParam("verb", "ListRecords")
                    .queryParam("metadataPrefix", "oai-primo")
                    .queryParam("set", "PRIMO")
                    .queryParam("from", "2020-01-22T12:39:59Z")
                    .queryParam("until", "2020-02-28T11:40:00Z" );

            InputStream stream = target.request()
                    .accept(MediaType.TEXT_XML)
                    .get(InputStream.class);

    }
}

错误消息

Exception in thread "main" javax.ws.rs.client.ResponseProcessingException: javax.ws.rs.ProcessingException: RESTEASY003145: Unable to find a MessageBodyReader of content-type text/xml;charset=utf-8 and type class java.io.InputStream
    at org.jboss.resteasy.client.jaxrs.internal.ClientInvocation.extractResult(ClientInvocation.java:163)
    at org.jboss.resteasy.client.jaxrs.internal.ClientInvocation.invoke(ClientInvocation.java:467)
    at org.jboss.resteasy.client.jaxrs.internal.ClientInvocationBuilder.get(ClientInvocationBuilder.java:197)
    at ch.hbu.sacker.oaipmh.VogellaExample.main(VogellaExample.java:45)
Caused by: javax.ws.rs.ProcessingException: RESTEASY003145: Unable to find a MessageBodyReader of content-type text/xml;charset=utf-8 and type class java.io.InputStream
    at org.jboss.resteasy.core.interception.ClientReaderInterceptorContext.throwReaderNotFound(ClientReaderInterceptorContext.java:37)
    at org.jboss.resteasy.core.interception.AbstractReaderInterceptorContext.getReader(AbstractReaderInterceptorContext.java:80)
    at org.jboss.resteasy.core.interception.AbstractReaderInterceptorContext.proceed(AbstractReaderInterceptorContext.java:53)
    at org.jboss.resteasy.client.jaxrs.internal.ClientResponse.readFrom(ClientResponse.java:211)
    at org.jboss.resteasy.specimpl.BuiltResponse.readEntity(BuiltResponse.java:88)
    at org.jboss.resteasy.specimpl.AbstractBuiltResponse.readEntity(AbstractBuiltResponse.java:256)
    at org.jboss.resteasy.client.jaxrs.internal.ClientInvocation.extractResult(ClientInvocation.java:127)
    ... 3 more

有人知道为什么会这样吗？

Answer 1

问题是上面代码的WebTarget --请求只调用了这个https://cmi.zb.uzh.ch/primo/api/oaipmh?verb=ListRecords --这确实会导致一个错误！

<OAI-PMH>
<responseDate>2021-02-07T10:06:28Z</responseDate>
<request verb="ListRecords">https://cmi.zb.uzh.ch/primo/api/oaipmh</request>
<error code="badArgument">Unknown arguments: </error>
</OAI-PMH>

正如这里所解释的，泽西岛rest客户端不添加查询参数我不得不覆盖目标。

    WebTarget target = client.target("https://cmi.zb.uzh.ch/primo/api/oaipmh?verb=ListRecords");

        target = target.queryParam("metadataPrefix", "oai_primo")
                .queryParam("set", "PRIMO")
                .queryParam("from", "2020-01-22T12:39:59Z")
                .queryParam("until", "2020-02-28T11:40:00Z" );

Answer 2

您正确地尝试使用3d派对Http客户端，而不是使用HttpURLConnection类。您可以做的是尝试其他可用的HTTP客户端。最受欢迎的是Apache Http客户端或好的Http客户端。然而，我也可能建议我自己的开放源码MgntUtils库使用Http客户端。它可能不像其他库那么广泛，但是非常简单，可以多次将请求发送到同一个URL。如果您想使用我的库，您的代码将如下所示

HttpClient client = new HttpClient();
client.setConnectionUrl("https://cmi.zb.uzh.ch/primo/api/oaipmh?verb=ListRecords&metadataPrefix=oai_primo&set=PRIMO&from=2020-01-22T12:39:59Z&until=2020-02-28T11:40:00Z");
client.setRequestProperty("Accept", "application/xml");
String xmlStr = client.sendHttpRequest(HttpMethod.GET);

下面是一个用于HttpClient类的Javadoc。这个库可以在Maven伪像或Github上获得(使用源代码和Javadoc)。