Android对复杂xml的增删改查操作

最新推荐文章于 2021-05-27 01:05:00 发布

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最新推荐文章于 2021-05-27 01:05:00 发布

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文章标签： android xml

本文链接：https://blog.youkuaiyun.com/u013508716/article/details/106103763

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Android对复杂xml的增删改查操作

采用dom方式对以下XML文件的节点进行增删改查。

<?xml version="1.0" encoding="utf-8"?>
<params> 
  <version>1.0</version>  
  <playlist> 
    <day> 
      <d20170610 time="2017-06-01 12:34:56">aa</d20170610> 
    </day> 
  </playlist>  
  <medialist> 
    <day> 
      <d20170610 time="2017-06-01 12:34:56">bb</d20170610>  
      <d20170704 time="2017-06-01 12:34:56">cc</d20170704> 
    </day> 
  </medialist>
</params>

1 加载XML文件：

    public static Document load(String filename) {
   
        Document document = null;
        try {
   
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            File file = new File(filename);
            document = builder.parse(file);
            document.normalize();
        } catch (SAXParseException saxe) {
   
            saxe.printStackTrace();
        } catch (Exception ex) {
   
            ex.printStackTrace();
        }
        return document;
    }

2 添加元素：

其中PlayBean是数据源，str判断是playlist，还是medialist 。

public void addElement(String filename, PlayBean playBean, String str) {
   
        Element root = document.getDocumentElement();
        NodeList stuNodeList = root.getElementsByTagName(str);
        for (int i = 0; i < stuNodeList.getLength(); i++) {
   
            Element stuElement = (Element) stuNodeList.item(i);
            NodeList stuInforList = stuElement.getChildNodes();
            for (int j = 0; j < stuInforList.getLength(); j++) {
   
                Node stuInforNode = stuInforList.item(j);
                if (stuInforNode.getNodeName().equals("day")) {
   
                    NodeList dayN = stuInforNode.getChildNodes();
                    String qTime = playBean.getQueryDate();
                    if (!qTime.startsWith("d")) {
   
                        qTime = "d" + qTime;
                    }
                    Element key = document.createElement(qTime);
                    Text nameText = document.createTextNode(playBean.getListname()

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