XML工具类 - XmlUtils.java

XML工具类，提供序列化XML、反序列化XML、获取指定节点的值的方法。

源码如下：(点击下载 - XmlUtils.java、dom4j-1.6.1.jar、xstream-1.4.7.jar )

 import org.dom4j.Document;
 import org.dom4j.DocumentException;
 import org.dom4j.DocumentHelper;
 import org.dom4j.Element;
 import com.thoughtworks.xstream.XStream;

 /**
  * XML工具类
  *
  */
 public class XmlUtils {

     private final static String XML_DECLARATION = "<?xml version=\"1.0\" encoding=\"utf-8\"?>";

     private XmlUtils() {
     }

     /**
      * 序列化XML
      *
      * @param obj
      * @param clazz
      * @return
      */
     public static <T> String toXML(Object obj) {
         XStream stream = getXStream();
         stream.processAnnotations(obj.getClass());
         return new StringBuffer(XML_DECLARATION).append(stream.toXML(obj)).toString();
     }

     /**
      * 反序列化XML
      *
      * @param xmlStr
      * @param clazz
      * @return
      */
     public static <T> T fromXML(String xmlStr, Class<T> clazz) {
         XStream stream = getXStream();
         stream.processAnnotations(clazz);
         Object obj = stream.fromXML(xmlStr);
         try {
             return clazz.cast(obj);
         } catch (ClassCastException e) {
             return null;
         }
     }

     /**
      * 获取指定节点的值
      *
      * @param xpath
      * @param params
      * @return
      */
     public static String getNodeValue(String xpath, String dataStr) {
         try {
             // 将字符串转为xml
             Document document = DocumentHelper.parseText(dataStr);
             // 查找节点
             Element element = (Element) document.selectSingleNode(xpath);
             if (element != null) {
                 return element.getStringValue();
             }
         } catch (DocumentException e) {
             e.printStackTrace();
         }
         return "";
     }

     /**
      * 获取Xstream实例
      *
      * @return
      */
     public static XStream getXStream() {
         return new XStream();
     }
 }