在eclipse中执行main方法的时候，默认的XML解析类是com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl，这个是没问题的。
默认的XML解析类是org.apache.xerces.jaxp.DocumentBuilderFactoryImpl，所以报了如上的错误。
解决方法1，
在XML解析之前，强制性的指定：
System.setProperty("javax.xml.parsers.DocumentBuilderFactory", "com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl");
解决方法2
当然DocumentBuilderFactoryImpl 在xercesImpl.jar
但导入此包又会产生其他问题，
建议由j2ee1.4换成 Java EE 5就没有问题了
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,谢谢斑竹,解决了我的问题!
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