<?xml version='1.0' encoding='utf-8'?>
</Server>
  </Service>
    </Engine>
      </Host>
        <!--配置一个路径，用"/images"代表docBase路径-->
        <Context path="/images" docBase="D:/upload/images" debug="0" reloadable="false"></Context>  
      </Host>
    </Engine>
  </Service>
</Server>

        //XML文件路径
        String xmlPath ="D:/MyProgramFiles/apache-tomcat-7.0.42/conf/server.xml";
        // 1.得到解析器
        SAXReader saxReader = new SAXReader();
        // 2指定解析哪个xml文件
        Document document = saxReader.read(new File(xmlPath));

        //通过XPath方式获取名字为Content且含有属性path='/images'的元素
        Element ele = (Element) document.selectSingleNode("//Context[@path='/images']");
        //获取该元素的属性名叫docBase的属性值
        String docBase = ele.attributeValue("docBase");