java - 如何使用 xsd:any 元素将 xml 作为字符串返回

Question

我需要复制由 Oracle 生成并部署在 Oracle 上的旧 Web 服务。新服务将用 Java 编写并部署在 Tomcat 上。原始服务的所有功能必须完全相同，这意味着我无法更改 wsdl 或响应对象的格式。

我正在使用 cxf 和 wsdl2java 来生成存根的类和服务。我的问题是原始 wsdl 使用了“any”元素，并且响应中有不寻常的 xml 代码填充到该元素中。我似乎无法重现与原始服务相同的响应。

wsdl 中的请求和响应类型定义：

        <complexType name="getNewServiceXML">
            <sequence>
                <element name="pNum" nillable="true" type="decimal" />
            </sequence>
        </complexType>
        <complexType name="getNewServiceXMLResponse">
            <sequence>
                <element name="result" nillable="true">
                    <complexType>
                        <sequence>
                            <any />
                        </sequence>
                    </complexType>
                </element>
            </sequence>
        </complexType>

CXF 生成 GetNewServiceXMLResponse 类，在该类中是 Result 类。在结果中可以找到任何字段。

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "getNewServiceXMLResponse", propOrder = {
    "result"
})
public class GetNewServiceXMLResponse {

    @XmlElement(required = true, nillable = true)
    protected GetNewServiceXMLResponse.Result result;

...

    @XmlAccessorType(XmlAccessType.FIELD)
    @XmlType(name = "", propOrder = {
        "any"
    })
    public static class Result {

        @XmlAnyElement(lax = true)
        protected Object any;
...

这是预期的响应格式：

<?xml version="1.0" encoding="UTF-8"?>
<env:Envelope xmlns:env="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ns0="http://dev.mycompany.com/NewService.wsdl/types/">
  <env:Body>
    <ns0:getNewServiceXMLResponseElement>
        <ns0:result>
            <result>
                <ROWSET>
                    <ROW num="0">
                        <FIELD1>3649648</FIELD1>
                        <FIELD2>WEEK</FIELD2>
                        <FIELD3>TTN476273</FIELD3>
                    </ROW>
                    <ROW num="1">
                        <FIELD1>3649650</FIELD1>
                        <FIELD2>WEEK</FIELD2>
                        <FIELD3>TTN476273</FIELD3>
                    </ROW>
                    <ROW num="2">
                        <FIELD1>540969</FIELD1>
                        <FIELD2>DAY</FIELD2>
                        <FIELD3>null</FIELD3>
                    </ROW>
                </ROWSET>
            </result>
        </ns0:result>
    </ns0:getNewServiceXMLResponseElement>
</env:Body>

我被 ROW num="X" 标签挂断了。我以前在 SOAP 服务中没有看到过这种情况。因此，我尝试手动创建 ROWSET xml 并将其放入字符串中。然后将字符串通过 any 元素传回。为了让它工作，我将它包装在一个 JAXBElement 中，以便它可以成功解组。

List<Object> dataRecords = manager.getDataRecords(request.getPNum());
GetNewServiceXMLResponse response = new GetNewServiceXMLResponse();
String str = manager.convertDataToString(dataRecords);
JAXBElement<String> obj = new JAXBElement<String>(new QName("result"), String.class, str);
result.setAny(obj);
response.setResult(result);

现在这种方法的问题是字符串被编码（因为它是一个字符串......），你最终得到的是< blah blah >etc 而不是漂亮的 xml。

<getNewServiceXMLResponseElement xmlns="http://dev.mycompany.com/NewService.wsdl/types/">
  <result>
    <result xmlns:ns2="http://dev.mycompany.com/NewService.wsdl/types/" xmlns="">&lt;ROWSET&gt;..snip..&lt;/ROWSET&gt;</result>
  </result>
</getNewServiceXMLResponseElement>

所以接下来我尝试创建一个文档（如其他帖子所建议）

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document document = builder.parse(new InputSource(new StringReader(str)));
JAXBElement<Document> obj = new JAXBElement<Document>(new QName("result"),Document.class,document);

这给我一个错误：

WARNING: Interceptor has thrown exception, unwinding now
org.apache.cxf.interceptor.Fault: Marshalling Error: org.w3c.dom.Document is not known to this context
    at org.apache.cxf.jaxb.JAXBEncoderDecoder.marshall(JAXBEncoderDecoder.java:159)
    at org.apache.cxf.jaxb.io.DataWriterImpl.write(DataWriterImpl.java:169)
    at org.apache.cxf.interceptor.AbstractOutDatabindingInterceptor.writeParts(AbstractOutDatabindingInterceptor.java:105)
    at org.apache.cxf.interceptor.BareOutInterceptor.handleMessage(BareOutInterceptor.java:68)
    at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:236)
    at org.apache.cxf.interceptor.OutgoingChainInterceptor.handleMessage(OutgoingChainInterceptor.java:74)
    at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:236)
    at org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:104)
    at org.apache.cxf.transport.servlet.ServletDestination.invoke(ServletDestination.java:99)
    at org.apache.cxf.transport.servlet.ServletController.invokeDestination(ServletController.java:452)
    at org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:196)
    at org.apache.cxf.transport.servlet.AbstractCXFServlet.invoke(AbstractCXFServlet.java:220)
    at org.apache.cxf.transport.servlet.AbstractCXFServlet.doPost(AbstractCXFServlet.java:153)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
    at org.apache.cxf.transport.servlet.AbstractCXFServlet.service(AbstractCXFServlet.java:211)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
    at com.googlecode.psiprobe.Tomcat70AgentValve.invoke(Tomcat70AgentValve.java:38)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
    at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:200)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:662)
Caused by: javax.xml.bind.MarshalException
 - with linked exception:
[javax.xml.bind.JAXBException: org.w3c.dom.Document is not known to this context]
    at com.sun.xml.bind.v2.runtime.MarshallerImpl.write(MarshallerImpl.java:318)
    at com.sun.xml.bind.v2.runtime.MarshallerImpl.marshal(MarshallerImpl.java:244)
    at javax.xml.bind.helpers.AbstractMarshallerImpl.marshal(AbstractMarshallerImpl.java:75)
    at org.apache.cxf.jaxb.JAXBEncoderDecoder.writeObject(JAXBEncoderDecoder.java:444)
    at org.apache.cxf.jaxb.JAXBEncoderDecoder.marshall(JAXBEncoderDecoder.java:138)
    ... 31 more
Caused by: javax.xml.bind.JAXBException: org.w3c.dom.Document is not known to this context
    at com.sun.xml.bind.v2.runtime.XMLSerializer.reportError(XMLSerializer.java:246)
    at com.sun.xml.bind.v2.runtime.XMLSerializer.reportError(XMLSerializer.java:261)
    at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl$1.serializeBody(ElementBeanInfoImpl.java:144)
    at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl$1.serializeBody(ElementBeanInfoImpl.java:189)
    at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl.serializeBody(ElementBeanInfoImpl.java:315)
    at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl.serializeRoot(ElementBeanInfoImpl.java:322)
    at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl.serializeRoot(ElementBeanInfoImpl.java:72)
    at com.sun.xml.bind.v2.runtime.property.SingleReferenceNodeProperty.serializeBody(SingleReferenceNodeProperty.java:111)
    at com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.serializeBody(ClassBeanInfoImpl.java:332)
    at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsXsiType(XMLSerializer.java:699)
    at com.sun.xml.bind.v2.runtime.property.SingleElementNodeProperty.serializeBody(SingleElementNodeProperty.java:152)
    at com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.serializeBody(ClassBeanInfoImpl.java:332)
    at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsXsiType(XMLSerializer.java:699)
    at com.sun.xml.bind.v2.runtime.property.SingleElementNodeProperty.serializeBody(SingleElementNodeProperty.java:152)
    at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl$1.serializeBody(ElementBeanInfoImpl.java:157)
    at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl$1.serializeBody(ElementBeanInfoImpl.java:189)
    at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl.serializeBody(ElementBeanInfoImpl.java:315)
    at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl.serializeRoot(ElementBeanInfoImpl.java:322)
    at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl.serializeRoot(ElementBeanInfoImpl.java:72)
    at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsRoot(XMLSerializer.java:494)
    at com.sun.xml.bind.v2.runtime.MarshallerImpl.write(MarshallerImpl.java:315)
    ... 35 more
Caused by: javax.xml.bind.JAXBException: org.w3c.dom.Document is not known to this context
    at com.sun.xml.bind.v2.runtime.JAXBContextImpl.getBeanInfo(JAXBContextImpl.java:621)
    at com.sun.xml.bind.v2.runtime.ElementBeanInfoImpl$1.serializeBody(ElementBeanInfoImpl.java:141)
    ... 53 more

怎么办？我是否走错了路，试图将 XML 作为其他内容（如字符串）发送？有没有办法更好地复制 ROW num="X" 行为？如果无法更改 wsdl（以及因此的基础对象），我还没有找到答案。

附加信息：Tomcat 7、Java 1.6

score 1 · Accepted Answer

以防万一其他人遇到与我类似的问题，这是我想出的解决方案。它不漂亮，但它有效。

我创建了一个基本的 Spring MVC Web 应用程序，其请求映射看起来与原始服务的端点完全一样。在控制器类中，解析输入，从数据库中获取结果记录，然后从数据中手动构造 xml 字符串：

@RequestMapping(value = "/getNewService", method = RequestMethod.POST)
public ModelAndView getNewServicePost() {
    StringWriter writer = new StringWriter();
    try {
        IOUtils.copy(request.getInputStream(), writer, "UTF-8");
    } catch (Exception e) {
        e.printStackTrace();
    }
    String theString = writer.toString();
    int pNum = XMLUtil.extractNum(theString);
    List<Object> results = XMLDaoLayer.getResults(pNum);
    String message = XMLUtil.convertListToResponse(results);
    return new ModelAndView("response","message",message);
}

response.jsp 页面如下所示：

<%@ page contentType="text/xml" %>${message}

SoapUI 可以毫无问题地点击“端点”并显示结果，它基本上不知道有什么区别。

显然，这不是最佳实践示例。由于多年来服务的界面没有任何变化，并且在整个过程被完全替换之前不会有任何变化，因此设计实际 Web 服务的所有好处/优势/等并不那么重要。我们只是想让它工作，它确实如此。

java - 如何使用 xsd:any 元素将 xml 作为字符串返回

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