Private Boolean dupliate (Document doc_dup, Element father, Element son) throws Exception { Boolean is done = false; String son_name = son.getNodeName (); Element sub ITEM = doc_dup.createElement (son_name); //复制节点的属性 If (son.hasAttributes ()){ NamedNodeMap attributes = son.getAttributes (); For (int i=0; i < attributes.getLength () ; i ++){ String attribute_name = attributes. Item (i). GetNodeName (); String attribute_value = attributes. Item (i). GetNodeValue (); SubITEM.setAttribute (attribute_name, attribute_value); } } Father.appendChild (sub ITEM); //复制节点的值 Text value son = (Text) son.getFirstChild (); String nodevalue_root = ""; If (value_son! = null && value_son.getLength () > 0) nodevalue_root = (String) value_son.getNodeValue (); Text valuenode_root = null; If ((nodevalue_root! = null)&&(nodevalue_root.length () > 0)) valuenode_root = doc_dup.createTextNode (nodevalue_root); If (valuenode_root! = null && valuenode_root.getLength () > 0) subITEM.appendChild (valuenode_root); //复制子结点 Novelist sub_messageItems = son.getChildNodes (); int sub_item_number = sub_messageItems.getLength(); if (sub_item_number < 2){ //如果没有子节点,则返回 Is done = true; } Else { For (int j = 1; j < sub_item_number; j=j+2) { //如果有子节点,则递归调用本方法 Element sub_messageItem = (Element) sub_messageItems.item (j); Is done = dupliate (doc_dup, subITEM, sub_messageItem); } } Return is done; } 方法writeTo()有两个参数(分别是目标XML文档的Document和文件名),将所得目标XML文档写入文件。
Private Boolean write To (Document doc, String fileName) throws Exception { Boolean isOver = false; DOM Source doms = new DOM Source (doc); File f = new File (fileName); Stream Result sr = new Stream Result (f); Try { Transformer Factory tf=TransformerFactory.newInstance (); Transformer t=tf.newTransformer (); Properties properties = t.getOutputProperties (); Properties.setProperty (OutputKeys.ENCODING,"GB2312"); T.setOutputProperties (properties); T.transform (doms, sr); IsOver = true; } Catch (TransformerConfigurationException tce) { Tce.printStackTrace (); } Catch (Transformer Exception te) { Te.printStackTrace (); } Return isOver; } 最后使用测试函数进行测试。对于两个已经存在的XML文件(比如,存在文件D:/a.xml和D:/b.xml,要将b.xml合并到a.xml中),可以测试如下:
Public static void main (String [] args) throws Exception { Boolean is done = is Merging ("D:/a.xml","D:/b.xml"); If (is Done) System.out.println ("XML files have been merged."); Else System.out.println ("XML files have NOT been merged."); } 总结