digester解析xml_org.xml.sax.SAXParseException; lineNumber: 2193; columnNumber: 41; 引用了实体 "nbsp", 但未声明它

四月 14, 2014 2:00:45 下午 org.apache.commons.digester.Digester fatalError
严重: Parse Fatal Error at line 2193173 column 41: 引用了实体 "nbsp", 但未声明它。
org.xml.sax.SAXParseException; lineNumber: 2193173; columnNumber: 41; 引用了实体 "nbsp", 但未声明它。
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEntityReference(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
at org.apache.commons.digester.Digester.parse(Digester.java:1567)
at ParseXML.parse(ParseXML.java:50)
at ParseXML.main(ParseXML.java:69)

org.xml.sax.SAXParseException; lineNumber: 2193173; columnNumber: 41; 引用了实体 "nbsp", 但未声明它。
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
at org.apache.commons.digester.Digester.parse(Digester.java:1567)
at ParseXML.parse(ParseXML.java:50)

at ParseXML.main(ParseXML.java:69)

错误原因：xml文档中有" "这个值，解析的时候碰到"&"会认为nbsp是转义字符，而又没有在头部定义转义字符。

解决方法1:在xml文档中将所有"&"替换成"&"，
另外"<" = "&lt;" ">" = "&gt;" "'" = "&apos;" """ = "&quot;"
解决方法2:在根元素之前声明实体如下：
<!DOCTYPE 根元素标签名 [
<!ENTITY nbsp " ">
<!ENTITY copy "©">
<!ENTITY reg "®">
<!ENTITY trade "™">
<!ENTITY mdash "—">
<!ENTITY ldquo "“">
<!ENTITY rdquo "”"> 
<!ENTITY pound "£">
<!ENTITY yen "¥">
<!ENTITY euro "€">
]>
在根元素下面的元素中碰到对应的实体会转变成对应的字符，如此处"&nbsp;"变成" "（空格）