org.xml.sax.SAXParseException: Premature end of file

2013-07-04 10:46:13 1.1k 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

感应电机无速度传感器FOC控制原理与Simulink仿真实践无速度传感器FOC控制是电机驱动领域的重要技术，通过算法重构实现仅依赖电气参数的闭环控制。其核心原理基于电机数学模型，利用Clark/Park变换和滑模观测器估算转子位置和转速。这种技术在工业伺服系统中具有显著价值，能有效降低系统成本并提高可靠性。典型应用场景包括纺织机械、风机驱动等需要精确转速控制的设备。本文以感应电机为例，详细解析了无感FOC的Simulink实现方法，特别关注滑模观测器设计和双闭环控制策略，为工程师提供可直接复用的参数调优经验。阅读详情

org.jdom.input.JDOMParseException: Error on line -1: Premature end of file.
at org.jdom.input.SAXBuilder.build(SAXBuilder.java:468)
at org.jdom.input.SAXBuilder.build(SAXBuilder.java:851)
at com.gsol.app.adaptor.importer.XmlParserPipe.transformMessageObjects(XmlParserPipe.java:93)
at com.gsol.enigma.adaptor.impl.BasePipe.processMessage(BasePipe.java:125)
at com.gsol.enigma.adaptor.impl.STPipelineController.processMessage(STPipelineController.java:43)
at com.gsol.enigma.adaptor.impl.SimpleController.processMessage(SimpleController.java:556)
at com.gsol.enigma.adaptor.hospital.HospitalPipe.processMessage(HospitalPipe.java:107)
at com.gsol.enigma.adaptor.impl.STPipelineController.processMessage(STPipelineController.java:43)
at com.gsol.enigma.adaptor.impl.SimpleController.processMessage(SimpleController.java:556)
at com.gsol.enigma.adaptor.impl.BaseSource.processMessage(BaseSource.java:277)
at com.gsol.enigma.adaptor.impl.BaseSource.sourceProcess(BaseSource.java:421)
at com.gsol.enigma.adaptor.impl.BaseSource.runPoll(BaseSource.java:320)
at com.gsol.enigma.adaptor.impl.BaseSource.run(BaseSource.java:238)
at com.gsol.enigma.adaptor.impl.SourceRunner.run(SourceRunner.java:95)
at java.lang.Thread.run(Thread.java:662)
Caused by: org.xml.sax.SAXParseException: Premature end of file.
at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Unknown 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.XMLVersionDetector.determineDocVersion(Unknown 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$JAXPSAXParser.parse(Unknown Source)
at org.jdom.input.SAXBuilder.build(SAXBuilder.java:453)
... 14 more
Caused by:
org.xml.sax.SAXParseException: Premature end of file.
at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
at org.apache.xerces.util.ErrorHandlerWrapper.fatalError(Unknown Source)
at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
at org.apache.xerces.impl.XMLVersionDetector.determineDocVersion(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
at org.jdom.input.SAXBuilder.build(SAXBuilder.java:453)
at org.jdom.input.SAXBuilder.build(SAXBuilder.java:851)
at com.gsol.app.adaptor.importer.XmlParserPipe.transformMessageObjects(XmlParserPipe.java:93)
at com.gsol.enigma.adaptor.impl.BasePipe.processMessage(BasePipe.java:125)
at com.gsol.enigma.adaptor.impl.STPipelineController.processMessage(STPipelineController.java:43)
at com.gsol.enigma.adaptor.impl.SimpleController.processMessage(SimpleController.java:556)
at com.gsol.enigma.adaptor.hospital.HospitalPipe.processMessage(HospitalPipe.java:107)

...全文

Ubuntu1804 关于ubuntu18.04下载软件仓库信息失败，请检查网络连接的解决方案今天电脑在更换软件源的时候遇到了这个问题。出现了如上图所示的错误信息。尝试了各家CSDN的博客之后，发现方法大同小异，均无法解决。方法大多都是要求更换软件源，如下所示：打开“Ubuntu软件中心”-->点击“编辑”-->点击“软件源”-->在Ubuntu软件界面，“下载自”默认是“中国的服务器”，改为“主服务器”试试 2.打开更新管理器-》设置-》选择站点-》... 阅读详情

aaqq552436

Java 51,407 成员 86,128 内容

+ 关注 + 加入社区

切换为时间正序

aaqq552436 2013-07-04

打赏
举报

xml文件确定不为空！

花谢尊前不敢香 2013-07-04

打赏
举报

reader为空值。看看你文件是否为空。

aaqq552436 2013-07-04

打赏
举报

上面是标红的那一行报错！感谢各位大侠

aaqq552436 2013-07-04

打赏
举报

protected InputStream getInputStream(MessageObject msgObj) throws Exception { InputStream inputstream = (InputStream) msgObj.get (MessageConstants.STREAM); if (inputstream == null) { Object sourceObj = msgObj.get (MessageConstants.SOURCE); Object fileObj = msgObj.get (MessageConstants.FILE); if (sourceObj instanceof ZipFile) { ZipFile source = (ZipFile) sourceObj; ZipEntry entry = source.getEntry(fileObj.toString()); // make sure the input stream is in the right encoding inputstream = source.getInputStream(entry); } else inputstream = new FileInputStream((File) fileObj); } return inputstream; }

aaqq552436 2013-07-04

打赏
举报

protected MessageObject[] transformMessageObjects (MessageObject[] msgObj) throws PipelineException { List retList = new ArrayList (); try { for (int i = 0; i < msgObj.length; i++) { MessageObject msg = msgObj[i]; InputStream inputstream = getInputStream(msg); if (inputstream != null) { InputStreamReader reader = new InputStreamReader(inputstream, encoding); Document doc = null; synchronized (documentBuilder) { doc = documentBuilder.build(reader); } if (doc != null) { msg.put(MessageConstants.DOCUMENT, doc); retList.add(msg); } } } } catch (Exception e) { logger.error ("[**" + getName() + "**error**] Unable to parse xml document", e); throw new PipelineException("[**" + getName() + "**error**] Failed to create src document " + e.getMessage(), PipelineException._HOSPITAL); } if (retList.isEmpty()) return null; return (MessageObject[])retList.toArray (new MessageObject[0]); }

org.xml.sax.SAXParseException: Premature end of file

相关推荐