JavaDay15-陈明泽

最新推荐文章于 2018-08-19 22:02:40 发布

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本文介绍了使用Dom4j库对XML文档进行增删改操作的方法。包括如何添加子节点、删除指定节点以及修改节点值等实用技巧。

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

<?xml version="1.0" encoding="utf-8"?>
<data>
    <fdin>
        <basic_info>
            <available_bal>5875.40</available_bal>
            <cur_in_amt>1.00</cur_in_amt>
            <invoice_type_value>0</invoice_type_value>
            <invoice_type_name>不开</invoice_type_name>
            <prp_amt>1.00</prp_amt>
        </basic_info>
        <invoice_attachs>
            <attach_file seq_no="1">
                <invoice_id>14650</invoice_id>
                <invoice_no>11112</invoice_no>
                <invoice_amt>3.00</invoice_amt>
                <invoice_rate_value>2</invoice_rate_value>
            </attach_file>
            <attach_file seq_no="2">
                <invoice_id>14700</invoice_id>
                <invoice_no>222222</invoice_no>
                <invoice_amt>3.00</invoice_amt>
                <invoice_rate_value>1</invoice_rate_value>
            </attach_file>
        </invoice_attachs>
    </fdin>
</data>

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
}

4、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<Node> 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();