DocumentBuilderFactory dbfac = DocumentBuilderFactory.newInstance();
     DocumentBuilder docBuilder;
     docBuilder = dbfac.newDocumentBuilder();
     Document doc = docBuilder.newDocument();

但是Java会自动创建这样的声明

<?xml version="1.0" encoding="UTF-8" standalone="no"?>

如何删除encoding =“UTF-8”standalone =“no”,这样就可以了

<?xml version="1.0"?>

谢谢！