JAXB格式化beanToXml

        context = JAXBContext.newInstance(Bean.class
);

        //下面代码演示将对象转变为xml

        Marshaller mar = context.createMarshaller();

        writer = new
 StringWriter();

        mar.marshal(bean, writer);

        //下面代码演示将上面生成的xml转换为对象

        reader = new
 StringReader(writer.toString());

        Unmarshaller unmar = context.createUnmarshaller();

        bean = (Bean)unmar.unmarshal(reader);