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JAXBContext jc = JAXBContext.newInstance("edu.xiyou.xml");
Unmarshaller u = jc.createUnmarshaller();
FileInputStream f = new FileInputStream("f:/eclipse/workspace/Web/data.xml");
JAXBElement J = (JAXBElement) u.unmarshal(f);
User usrs = (User)j.getValue();
User usrs = (User) u.unmarshal(f);
User usrs = (User) u.unmarshal(f);
的话
JAXBContext jc = JAXBContext.newInstance("edu.xiyou.xml");
Unmarshaller u = jc.createUnmarshaller();
FileInputStream f = new FileInputStream("f:/eclipse/workspace/Web/data.xml");
User usrs = (User) u.unmarshal(f);