解析 xml 空格错误

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在解析xml时要注意一个问题那就是 “<?xml version="1.0" encoding="UTF-8"?> ” 之前不能有空格，如果出现空格就会报如下异常，所以在写xml文件时要注意不能在开始有空格！

org.dom4j.DocumentException: Error on line 1 of document  : The processing instruction target matching "[xX][mM][lL]" is not allowed. Nested exception: The processing instruction target matching "[xX][mM][lL]" is not allowed.at org.dom4j.io.SAXReader.read(SAXReader.java:482)at org.dom4j.io.SAXReader.read(SAXReader.java:365)at com.soufun.last.ad.utils.MySAXReader.FileReader(MySAXReader.java:71)at com.soufun.last.ad.utils.MySAXReader.main(MySAXReader.java:81)Nested exception: org.xml.sax.SAXParseException: The processing instruction target matching "[xX][mM][lL]" is not allowed.at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:195)at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(ErrorHandlerWrapper.java:174)at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:388)at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(XMLScanner.java:1427)at com.sun.org.apache.xerces.internal.impl.XMLScanner.scanPIData(XMLScanner.java:714)at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanPIData(XMLDocumentFragmentScannerImpl.java:1020)at com.sun.org.apache.xerces.internal.impl.XMLScanner.scanPI(XMLScanner.java:682)at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:953)at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:647)at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:140)at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:511)at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:808)at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:119)at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205)at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522)at org.dom4j.io.SAXReader.read(SAXReader.java:465)at org.dom4j.io.SAXReader.read(SAXReader.java:365)

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