Java使用JAXBContext从XML中提取值

我在尝试将XML中的值提取到Java中时遇到了一些问题。以下是我的xml格式：

<?xml version="1.0" encoding="UTF-8" ?>
<TRB_TRX xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<HEADER ReqNotf="N" TransactionCode="L9_BLACKLIST_SET" PublisherApplID="CL" PublisherApplThreadID="1" EntityId="58241962" RoutingId="2626289" EntityType="ACCOUNT" IssueDate="2019-06-18T23:59:59" EffectiveDate="2019-06-18T23:59:59"/>
    <DATA>
        <BlacklistCodeSet>
            <TransactionHeaderInfoExt>
                <ApplicationId>CL</ApplicationId>
                <RequestDate>2019-06-18T23:59:59</RequestDate>
            </TransactionHeaderInfoExt>
            <ClEntityIdInfoExt>
                <EntityId>58241962</EntityId>
                <EntityType>ACCOUNT</EntityType>
            </ClEntityIdInfoExt>
            <GeneralCollectionEntityInfoExt>
                <BlacklistCode>D</BlacklistCode>
            </GeneralCollectionEntityInfoExt>
        </BlacklistCodeSet>
    </DATA>
    </TRB_TRX>

我尝试提取值的部分：

File file = new File("src/main/resources/xml/blacklistcode.xml");
JAXBContext jaxbContext = JAXBContext.newInstance(BlackListCode.class);

Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
BlackListCode blacklistcode = (BlackListCode) jaxbUnmarshaller.unmarshal(file);

log.debug("ACCOUNT NO IS " + blacklistcode.getEntityId());
log.debug("BLACK LIST CODE IS " + blacklistcode.getBlackListCode());

我得到的错误是：

javax.xml.bind.UnmarshalException: unexpected element (uri:"", local:"TRB_TRX"). Expected elements are <{}BlacklistCodeSet>
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.handleEvent(UnmarshallingContext.java:726)
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportError(Loader.java:247)
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportError(Loader.java:242)
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportUnexpectedChildElement(Loader.java:109)
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext$DefaultRootLoader.childElement(UnmarshallingContext.java:1131)
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext._startElement(UnmarshallingContext.java:556)
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.startElement(UnmarshallingContext.java:538)
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.SAXConnector.startElement(SAXConnector.java:153)
    at oracle.xml.parser.v2.NonValidatingParser.parseElement(NonValidatingParser.java:1588)
    at oracle.xml.parser.v2.NonValidatingParser.parseRootElement(NonValidatingParser.java:448)
    at oracle.xml.parser.v2.NonValidatingParser.parseDocument(NonValidatingParser.java:394)
    at oracle.xml.parser.v2.XMLParser.parse(XMLParser.java:236)
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:243)
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:214)
    at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:157)
    at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:162)
    at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:171)
    at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:189)

    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:749)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:688)
    at singtel.ecom.eai.config.sqlprocessor.processor.EaiAccountTempSqlProcessor$$EnhancerBySpringCGLIB$$f20399b4.process(<generated>)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.camel.support.ObjectHelper.invokeMethodSafe(ObjectHelper.java:201)
    at org.apache.camel.component.bean.MethodInfo.invoke(MethodInfo.java:423)
    at org.apache.camel.component.bean.MethodInfo$1.doProceed(MethodInfo.java:244)
    at org.apache.camel.component.bean.MethodInfo$1.proceed(MethodInfo.java:215)
    at org.apache.camel.component.bean.AbstractBeanProcessor.process(AbstractBeanProcessor.java:148)
    at org.apache.camel.component.bean.BeanProcessor.process(BeanProcessor.java:55)
    at org.apache.camel.processor.errorhandler.RedeliveryErrorHandler$RedeliveryState.run(RedeliveryErrorHandler.java:476)
    at org.apache.camel.impl.engine.DefaultReactiveExecutor$Worker.schedule(DefaultReactiveExecutor.java:185)
    at org.apache.camel.impl.engine.DefaultReactiveExecutor.scheduleMain(DefaultReactiveExecutor.java:59)
    at org.apache.camel.processor.Pipeline.process(Pipeline.java:87)
    at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:228)
    at org.apache.camel.component.timer.TimerConsumer.sendTimerExchange(TimerConsumer.java:193)
    at org.apache.camel.component.timer.TimerConsumer$1.run(TimerConsumer.java:75)
    at java.util.TimerThread.mainLoop(Timer.java:555)
    at java.util.TimerThread.run(Timer.java:505)

javax.xml.bind.UnmarshaleException:意外元素（uri:，local:“TRB_TRX”）。预期的要素是
位于com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.handleEvent（UnmarshallingContext.java:726）
位于com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportError（Loader.java:247）
位于com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportError（Loader.java:242）
位于com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportUnexpectedChildElement（Loader.java:109）
位于com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext$DefaultRootLoader.childElement（UnmarshallingContext.java:1131）
位于com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.\u startElement（UnmarshallingContext.java:556）
位于com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.startElement（UnmarshallingContext.java:538）
位于com.sun.xml.internal.bind.v2.runtime.unmarshaller.SAXConnector.startElement（SAXConnector.java:153）
位于oracle.xml.parser.v2.NonValidatingParser.parseElement（NonValidatingParser.java:1588）
位于oracle.xml.parser.v2.NonValidatingParser.parseRootElement（NonValidatingParser.java:448）
位于oracle.xml.parser.v2.NonValidatingParser.parseDocument（NonValidatingParser.java:394）
位于oracle.xml.parser.v2.XMLParser.parse（XMLParser.java:236）
位于com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0（UnmarshallerImpl.java:243）
位于com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal（UnmarshallerImpl.java:214）
位于javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal（AbstractUnmarshallerImpl.java:157）
位于javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal（AbstractUnmarshallerImpl.java:162）
位于javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal（AbstractUnmarshallerImpl.java:171）
位于javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal（AbstractUnmarshallerImpl.java:189）
位于org.springframework.cglib.proxy.MethodProxy.invoke（MethodProxy.java:218）
位于org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint（CglibAopProxy.java:749）
在org.springframework.aop.framework.ReflectiveMethodInvocation.procedue（ReflectiveMethodInvocation.java:163）上
位于org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke（PersistenceExceptionTranslationInterceptor.java:139）
位于org.springframework.aop.framework.ReflectiveMethodInvocation.procedue（ReflectiveMethodInvocation.java:186）
位于org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept（CglibAopProxy.java:688）
位于singtel.ecom.eai.config.sqlprocessor.processor.EaiAccountTempSqlProcessor$$EnhancerBySpringCGLIB$$f20399b4.process（）
在sun.reflect.NativeMethodAccessorImpl.invoke0（本机方法）处
位于sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:62）
在sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）中
位于java.lang.reflect.Method.invoke（Method.java:498）
位于org.apache.camel.support.ObjectHelper.invokeMethodSafe（ObjectHelper.java:201）
位于org.apache.camel.component.bean.MethodInfo.invoke（MethodInfo.java:423）
位于org.apache.camel.component.bean.MethodInfo$1.doProceed（MethodInfo.java:244）
在org.apache.camel.component.bean.MethodInfo$1.procedure（MethodInfo.java:215）上
位于org.apache.camel.component.bean.AbstractBeanProcessor.process（AbstractBeanProcessor.java:148）
位于org.apache.camel.component.bean.BeanProcessor.process（BeanProcessor.java:55）
位于org.apache.camel.processor.errorhandler.RedeliveryRorHandler$RedeliveryState.run（RedeliveryRorHandler.java:476）
位于org.apache.camel.impl.engine.DefaultReactiveExecutor$Worker.schedule（DefaultReactiveExecutor.java:185）
位于org.apache.camel.impl.engine.DefaultReactiveExecutor.scheduleMain（DefaultReactiveExecutor.java:59）
位于org.apache.camel.processor.Pipeline.process（Pipeline.java:87）
位于org.apache.camel.processor.CamelInternalProcessor.process（CamelInternalProcessor.java:228）
位于org.apache.camel.component.timer.TimerConsumer.sendTimerExchange（TimerConsumer.java:193）
位于org.apache.camel.component.timer.TimerConsumer$1.run（TimerConsumer.java:75）
位于java.util.TimerThread.mainLoop（Timer.java:555）
在java.util.TimerThread.run（Timer.java:505）

您已在代码中标记为RootElement。但是XML文件包含上面的内容。在解组过程中，API在进入BlacklistCodeSet之前首先遇到TRB_TRX。 试试这个： 1.移除标签并检查。 2.将TRB_TRX作为根元素并进行检查。

---

第二种选择更有意义。但是，它需要额外的逻辑来处理TRB_TRX标记，因为您的BlacklistCode类不包含解析该标记的元素。

如何循环获取BlacklistCodeSet节点？我相信此链接提供了您正在寻找的解决方案。请查收。在不同的网站上有很多例子。只需谷歌“使用循环解组”之类的东西。

javax.xml.bind.UnmarshalException: unexpected element (uri:"", local:"TRB_TRX"). Expected elements are <{}BlacklistCodeSet>
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.handleEvent(UnmarshallingContext.java:726)
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportError(Loader.java:247)
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportError(Loader.java:242)
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.Loader.reportUnexpectedChildElement(Loader.java:109)
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext$DefaultRootLoader.childElement(UnmarshallingContext.java:1131)
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext._startElement(UnmarshallingContext.java:556)
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.startElement(UnmarshallingContext.java:538)
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.SAXConnector.startElement(SAXConnector.java:153)
    at oracle.xml.parser.v2.NonValidatingParser.parseElement(NonValidatingParser.java:1588)
    at oracle.xml.parser.v2.NonValidatingParser.parseRootElement(NonValidatingParser.java:448)
    at oracle.xml.parser.v2.NonValidatingParser.parseDocument(NonValidatingParser.java:394)
    at oracle.xml.parser.v2.XMLParser.parse(XMLParser.java:236)
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:243)
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:214)
    at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:157)
    at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:162)
    at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:171)
    at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:189)

    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:749)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:688)
    at singtel.ecom.eai.config.sqlprocessor.processor.EaiAccountTempSqlProcessor$$EnhancerBySpringCGLIB$$f20399b4.process(<generated>)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.camel.support.ObjectHelper.invokeMethodSafe(ObjectHelper.java:201)
    at org.apache.camel.component.bean.MethodInfo.invoke(MethodInfo.java:423)
    at org.apache.camel.component.bean.MethodInfo$1.doProceed(MethodInfo.java:244)
    at org.apache.camel.component.bean.MethodInfo$1.proceed(MethodInfo.java:215)
    at org.apache.camel.component.bean.AbstractBeanProcessor.process(AbstractBeanProcessor.java:148)
    at org.apache.camel.component.bean.BeanProcessor.process(BeanProcessor.java:55)
    at org.apache.camel.processor.errorhandler.RedeliveryErrorHandler$RedeliveryState.run(RedeliveryErrorHandler.java:476)
    at org.apache.camel.impl.engine.DefaultReactiveExecutor$Worker.schedule(DefaultReactiveExecutor.java:185)
    at org.apache.camel.impl.engine.DefaultReactiveExecutor.scheduleMain(DefaultReactiveExecutor.java:59)
    at org.apache.camel.processor.Pipeline.process(Pipeline.java:87)
    at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:228)
    at org.apache.camel.component.timer.TimerConsumer.sendTimerExchange(TimerConsumer.java:193)
    at org.apache.camel.component.timer.TimerConsumer$1.run(TimerConsumer.java:75)
    at java.util.TimerThread.mainLoop(Timer.java:555)
    at java.util.TimerThread.run(Timer.java:505)