java - 如何解析从客户端收到的xml结果

Question

以下代码向 Web 服务发送请求并接收结果。它成功发送请求并在控制台上显示结果，问题是我无法将 xml 解析为对象。

代码

    Request req = new Request();
    req.setLanguage(lang);

    webser webs = new webser();
    webs.setRequest(req);

        JAXBContext context = JAXBContext.newInstance(webser.class);
        Marshaller m = context.createMarshaller();
        m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);

        URL url = new URL("http://example.com");
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setDoOutput(true);
        connection.setInstanceFollowRedirects(false);
        connection.setRequestMethod("POST");
        connection.setRequestProperty("Content-Type", "application/xml");

        OutputStream os = connection.getOutputStream();
        m.marshal(webs, os);

        WebResponse result = (WebResponse) JAXB.unmarshal(connection.getInputStream(), WebResponse.class);
        System.err.println(">>>>>>" + result.getResponse().getInfogetPersons().get(0).getId()); 
                                                      //does not return anything

        //**** populating the object manually ****
        String edd = ">";
        person p1 = new Person();
        p1.setId(1);
        Person p2 = new Person();
        p2.setId(2);

        Info info = new linfo();
        info.getPersons().add(p1);
        info.gePersons().add(p2);

        Response r = new Response();
        r.setinfo(info);

        WebResponse result2 = new WebResponse();
        result2.setResponse(r);

        JAXB.marshal(result2, edd);
        System.err.println("Result:" + edd);   << does not return anything

        connection.disconnect();

    } catch (IOException e) {
        return e.getMessage(); 
    } catch (JAXBException e) {
        return e.getMessage();
    }

WebResponse.java

@XmlRootElement
public class WebResponse {

    @XmlElement(name = "Response")
    private Response response = null;

    public Response getResponse() {
        return response;
    }

    public void setResponse(Response response) {
        this.response = response;
    }  
}

Response.java

@XmlRootElement
public class Response {
   @XmlRootElement (name = "Info")
   private Info info;
   ...
}

Info.java

   @XmlRootElement
   public class Info {
      @XmlRootElement ( name = "Person")
      private List<Person> person;
      ....
   }

Person.java

   @XmlRootElement
   public class Person{

      private int Id;

      @XmlElement (name = "Id")
      public int getId() {
        return Id;
      }

      public void setId(int Id) {
        this.Id = Id;
      }
   }

服务器的实际响应

<?xml version="1.0" encoding="UTF-8"?>
<WebResponse>
      <Response target="test">
           <Info>
               <Person>
                   <Id>83094</Id>
                   <Age>34</Age>
                   <FGs>
                       <HF>0</HF>
                       <HI>1</HI>
                   </FGs>
                   <Rt>
                          <Rid parentid="412404">201735813</Rid>
                          <Rname>Special</Rname>
                          <Ca>2</Ca>
                          <link>www.google.com/test</link>
                  </Rt>
                  <Rt>
                          <Rid parentid="777777">787878</Rid>
                          <Rname>Standard</Rname>
                          <Ca>7</Ca>
                          <link>www.yahoo.com/blank</link>
                  </Rt>
             </Person>
             <Person>
               ....
              </Person>
              ......
         </Info>
         .....

Answer 1

您无法直接解码到 List<Response> 。您将需要解码具有 List<Response> 类型的映射属性的类。相反。

更新#1

此外，您要解码的类需要与您要解码的 XML 级别相对应。按照您的代码现在的情况，您需要解码到表示 Web 响应的类。如果您想解码文档中的子部分，您可以开始使用 StAX 解析 XML，然后前进 XMLStreamReader到适当的位置并解码它。

• http://blog.bdoughan.com/2012/08/handle-middle-of-xml-document-with-jaxb.html

更新#2

由于您有点困难，下面是您可以使用的模型。

Java 模型

网络响应

如果您要注释字段(实例变量)，那么您应该指定 @XmlAccessorType(XmlAccessType.FIELD)在您的类(class)上(请参阅:http://blog.bdoughan.com/2011/06/using-jaxbs-xmlaccessortype-to.html)。

import javax.xml.bind.annotation.*;

@XmlRootElement(name="WebResponse")
@XmlAccessorType(XmlAccessType.FIELD)
public class WebResponse {

    @XmlElement(name = "Response")
    private Response response = null;

}

回应

您可以消除 Info使用 @XmlElementWrapper 进行类用于表示分组元素的注释(请参阅: http://blog.bdoughan.com/2010/09/jaxb-collection-properties.html )。

import java.util.List;
import javax.xml.bind.annotation.*;

@XmlAccessorType(XmlAccessType.FIELD)
public class Response {

    @XmlElementWrapper(name = "Info")
    @XmlElement(name = "Person")
    private List<Person> person;

    @XmlAttribute
    private String target;

}

人

您只需使用 @XmlRootElement在您想要编码的顶级类(class)上。

import javax.xml.bind.annotation.*;

@XmlAccessorType(XmlAccessType.FIELD)
public class Person {

    @XmlElement(name = "Id")
    private int id;

}

演示代码

演示

import java.io.File;
import javax.xml.bind.*;

public class Demo {

    public static void main(String[] args) throws Exception {
        JAXBContext jc = JAXBContext.newInstance(WebResponse.class);

        Unmarshaller unmarshaller = jc.createUnmarshaller();
        File xml = new File("src/forum21797000/input.xml");
        WebResponse wr = (WebResponse) unmarshaller.unmarshal(xml);

        Marshaller marshaller = jc.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.marshal(wr, System.out);
    }

}

输入.xml/输出

<?xml version="1.0" encoding="UTF-8"?>
<WebResponse>
    <Response target="test">
        <Info>
            <Person>
                <Id>83094</Id>
            </Person>
            <Person>
                <Id>0</Id>
            </Person>
        </Info>
    </Response>
</WebResponse>