问题的根源是：
The cause of this is a file that is not UTF-8 is being parsed as UTF-8. It is likely that the parser is encountering a byte value in the range
FE-FF. These values are invalid in the UTF-8 encoding.
说简单点，当你解析别人的xml格式出现这个错误可能就是别人在生成xml时没有保存为utf-8的字符编码格式。
在中文版的window下java的默认的编码为GBK，也就是所虽然我们标识了要将xml保存为utf-8格式但实际上文件是以GBK格式来保存的，所以这也就是为什么能够我们使用GBK、GB2312编码来生成xml文件能正确的被解析，而以UTF-8格式生成的文件不能被xml解析器所解析的原因。
xml解析时遇到的编码异常：
org.dom4j.DocumentException: Invalid byte 1 of 1-byte UTF-8 sequence. Nested exception: Invalid byte 1 of 1-byte UTF-8 sequence. at org.dom4j.io.SAXReader.read(SAXReader.java:484) at org.dom4j.io.SAXReader.read(SAXReader.java:321) at com.dataoperate.PaseXml.pXml(PaseXml.java:28) at com.dataoperate.JdbcOp.insertDb(JdbcOp.java:30) at com.dataoperate.JdbcOp.main(JdbcOp.java:89) Nested exception: com.sun.org.apache.xerces.internal.impl.io.MalformedByteSequenceException: Invalid byte 1 of 1-byte UTF-8 sequence. at com.sun.org.apache.xerces.internal.impl.io.UTF8Reader.invalidByte(UTF8Reader.java:684) at com.sun.org.apache.xerces.internal.impl.io.UTF8Reader.read(UTF8Reader.java:554) at com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.load(XMLEntityScanner.java:1742) at com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.peekChar(XMLEntityScanner.java:487) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2687) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648) at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:140) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:511) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:808) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737) at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:119) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205) at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522) at org.dom4j.io.SAXReader.read(SAXReader.java:465) at org.dom4j.io.SAXReader.read(SAXReader.java:321) at com.dataoperate.PaseXml.pXml(PaseXml.java:28) at com.dataoperate.JdbcOp.insertDb(JdbcOp.java:30) at com.dataoperate.JdbcOp.main(JdbcOp.java:89) Nested exception: com.sun.org.apache.xerces.internal.impl.io.MalformedByteSequenceException: Invalid byte 1 of 1-byte UTF-8 sequence. at com.sun.org.apache.xerces.internal.impl.io.UTF8Reader.invalidByte(UTF8Reader.java:684) at com.sun.org.apache.xerces.internal.impl.io.UTF8Reader.read(UTF8Reader.java:554) at com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.load(XMLEntityScanner.java:1742) at com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.peekChar(XMLEntityScanner.java:487) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2687) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648) at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:140) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:511) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:808) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737) at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:119) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205) at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522) at org.dom4j.io.SAXReader.read(SAXReader.java:465) at org.dom4j.io.SAXReader.read(SAXReader.java:321) at com.dataoperate.PaseXml.pXml(PaseXml.java:28) at com.dataoperate.JdbcOp.insertDb(JdbcOp.java:30) at com.dataoperate.JdbcOp.main(JdbcOp.java:89)
1、最简单就是把<?xml version="1.0" encoding="UTF-8"?>改成<?xml version="1.0" encoding="gbk"?>（规避方案）
2、或者把xml打开另存的时候把字符集改为UTF-8后保存（推荐）
3、在代码解析的时候先把xml重新写一遍
SAXReader reader = new SAXReader();
org.dom4j.Document document = reader.read("D:\ha.xml");
OutputFormat of = new OutputFormat();
of.setEncoding("UTF-8"); //改变编码方式
XMLWriter writer = new XMLWriter(new FileWriter "d:\dom4j.xml"), of); 4、直接dom4j读取的时候用io来读，修改字符编码
FileInputStream in = new FileInputStream(new File(fileName)); Reader read = new InputStreamReader(in,"gbk"); Document document = reader.read(read);