code: public static Document getDocument(File file) {
  		SAXReader reader = new SAXReader();
  		Document document = null;
  		try {
  			document = reader.read(file);
  		} catch (DocumentException e) {
  			throw new RuntimeException(e);
  		}
  		return document;
  	}
docs: 获取XML文件的Document文档对象
  
  @param file
  指定文件
  @return 返回一个Document对象