有下面这样一段XML,我想取出B6010000000003值,用DOM4J应该怎么取?
<env:Envelope xmlns:env="http://schemas.xmlsoap.org/soap/envelope/">
<env:Header>
</env:Header>
<env:Body>
<orac:PublishedInsertF58M002ResponseElement xmlns:orac="http://www.doc.J5805015/">
<java:E1MessageList xmlns:java="java:doc.base"/>
<java:CustomerNumber xmlns:java="java:doc.valueobject">
B6010000000003
</java:CustomerNumber>
</orac:PublishedInsertF58M002ResponseElement>
</env:Body>
</env:Envelope>