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

编程问答 2022-05-28

问题描述

这是一个参数化的请求。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。 我像这样成功地做到了：

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);

但我想动态创建请求。有一个 JSF 页面，用户可以在其中输入参数。 我想到了 Jersey-Client，因为我可以轻松地用字段替换 queryParam 中的字符串。但我无法将 Jersey 客户端链接到我的 Unmarshaller。

我的想法是将响应转换为输入流并将其提供给 Unmarshaller。

这是我尝试过的。

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);

    }
}

错误信息

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？

解决方法

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javajavarest-clientunmarshalling