java - java中SAX解析器的问题

Question

当使用 SOAP 请求调用 Web 服务时，会出现以下解析错误。 我检查了请求的序言，它没有空格或破折号。即使它会导致以下错误

org.xml.sax.SAXParseException: Content is not allowed in prolog.
    at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Un
  known Source)
    at org.apache.xerces.util.ErrorHandlerWrapper.fatalError(Unknown Source)

    at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
    at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
    at org.apache.xerces.impl.XMLScanner.reportFatalError(Unknown Source)
    at org.apache.xerces.impl.XMLDocumentScannerImpl$PrologDispatcher.dispat
ch(Unknown Source)
    at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Un
known Source)
    at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
    at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
    at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
    at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
    at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Sour
ce)
    at org.apache.xerces.jaxp.SAXParserImpl.parse(Unknown Source)
    at javax.xml.parsers.SAXParser.parse(SAXParser.java:198)
    at requestModel.SimpleCheckMail.checkMail(SimpleCheckMail.java:162)
    at model.InboxDataBean.prepareList(InboxDataBean.java:97)
    at model.InboxDataBean.getemailList(InboxDataBean.java:207)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at javax.el.BeanELResolver.getValue(BeanELResolver.java:87)
    at com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELR
esolver.java:176)
    at com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELRe
solver.java:203)
    at org.apache.el.parser.AstValue.getValue(AstValue.java:169)
    at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:1
89)
    at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpress
ion.java:109)
    at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.
 java:194)
    at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.
java:182)
    at javax.faces.component.UIData.getValue(UIData.java:731)
    at javax.faces.component.UIData.getDataModel(UIData.java:1798)
    at javax.faces.component.UIData.setRowIndexWithoutRowStatePreserved(UIDa
ta.java:484)
    at javax.faces.component.UIData.setRowIndex(UIData.java:473)
    at com.sun.faces.renderkit.html_basic.TableRenderer.encodeBegin(TableRen
 derer.java:81)
    at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.jav
 a:820)
    at javax.faces.component.UIData.encodeBegin(UIData.java:1118)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1754)
    at javax.faces.render.Renderer.encodeChildren(Renderer.java:168)
    at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.
java:845)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1756)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1759)
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView
(FaceletViewHandlingStrategy.java:401)
    at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewH
andler.java:131)
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePha
se.java:121)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:410)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:224)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:169)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(Authentica
torBase.java:472)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:168)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
 ava:98)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:
 927)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav
a:407)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp
 11Processor.java:987)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(
AbstractProtocol.java:579)
    at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoin
t.java:1805)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExec
utor.java:885)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor
.java:907)
    at java.lang.Thread.run(Thread.java:619)

请让我知道这个错误是什么问题......提前感谢

<小时/>

是的....你们都是对的....但是我得到的是它是一个 SOAP 请求，并且我已经仔细地看到了该请求，没有坏字符......但是问题是，当我通过soap请求调用Web服务时，它给出null作为响应，所以我收到错误...... 一旦Web服务正常工作......现在就可以正常工作......谢谢大家

Answer 1

说明xml中<?xml ...之前有东西仔细看一下。还要检查是否存在不可见字符(您可以在任何十六进制编辑器中执行此操作)。有时 Windows 记事本会在文件开头添加他的标记。