Dom4j节点的增、删、改

1、我们要进行操作的xml文件，这个xml文件是表中的一个xml字段




5875.40
1.00
0
不开
1.00



14650
11112
3.00
2


14700
222222
3.00
1





2、给指定的节点，添加子节点，在这里我们需要给invoice_attachs节点增加一个attach_file的子节点。

String xmlData = fdPlanH.getPlanXml();//获取fdPlanH表中的xml字段
BaseXmlDocument xmlDoc = new BaseXmlDocument(xmlData);
Node invoice_attachs = xmlDoc.getNode("/data/fdin/invoice_attachs");
if(invoice_attachs!=null){
   /**给invoice_attachs添加子节点**/
   Element attach_file = ((Element) invoice_attachs).addElement("attach_file");
   attach_file.addAttribute("seq_no","3");//给节点增加属性
   Element invoice_id = attach_file.addElement("invoice_id");
   invoice_id.setText("14701");
   Element invoice_no = attach_file.addElement("invoice_no");
   invoice_no.setText("333333");
   Element invoice_amt = attach_file.addElement("invoice_amt");
   invoice_amt.setText("4.00");
   Element invoice_rate_value = attach_file.addElement("invoice_rate_value");
   invoice_rate_value.setText("3");
}

//最后把改好的xmlData赋值给原来的xmlData,就完成了xml的增加节点了
 xmlData=xmlDoc.getXmlDocument().asXML();

3、删除节点：删除seq_no属性为2的attach_file节点

String xmlData = fdPlanH.getPlanXml();//获取fdPlanH表中的xml字段
BaseXmlDocument xmlDoc = new BaseXmlDocument(xmlData);
Node invoice_attachs = xmlDoc.getNode("/data/fdin/invoice_attachs");
if(invoice_attachs!=null){
   String attr="2";
   Node attach_file=invoice_attachs.
   selectSingleNode("attach_file[@seq_no='"+attr+"']");   
   ((Element) attach_file).getParent().remove(attach_file);//删除步骤
}

3、修改节点的值

String xmlData = fdPlanH.getPlanXml();//获取fdPlanH表中的xml字段
BaseXmlDocument xmlDoc = new BaseXmlDocument(xmlData);
Node invoice_attachs = xmlDoc.getNode("/data/fdin/invoice_attachs");
if(invoice_attachs!=null){
   List attachFileList = invoice_attachs.selectNodes("attach_file");
   for (Node invoice : attachFileList) {
        Node invoiceIdNode = invoice.selectSingleNode("invoice_id");
        Node invoiceAmtNode = invoice.selectSingleNode("invoice_amt");
        Node invoiceNoNode = invoice.selectSingleNode("invoice_no");
        /**节点的值 更新**/
        Node invoiceRateNode = invoice.selectSingleNode("invoice_rate_value");
        invoiceIdNode.setText("");
        invoiceAmtNode.setText(ObjectUtils.toString(new BigDecimal("2.00")));
        invoiceNoNode.setText("");
        invoiceRateNode.setText("");

    /**节点的属性值更新**/
    Attribute seq_no = ((Element) invoice).attribute("seq_no");
    seq_no.setValue(fdInInvoice.getSeqNo().toString());
   }
}

//最后把改好的xmlData赋值给原来的xmlData,就完成了xml的修改节点了
 xmlData=xmlDoc.getXmlDocument().asXML();