Android dom parses xml method

First create an xml file yourself: DomTest.xml

<?xml version="1.0" encoding="utf-8"?>  
<classes>  
    <group name="一年级" num="10">  
        <person name="小明" age="7">  
            <chinese>  
                语文80  
            </chinese>  
            <english>  
                英语89  
            </english>  
        </person>  
        <person name="小强" age="8">  
            <chinese>  
                语文90  
            </chinese>  
            <english>  
                英语99  
            </english>  
        </person>  
    </group>  
    <group name="二年级" num="20">  
        <person name="小文" age="8">  
            <chinese>  
                语文85  
            </chinese>  
            <english>  
                英语95  
            </english>  
        </person>  
        <person name="小中" age="9">  
            <chinese>  
                语文80  
            </chinese>  
            <english>  
                英语90  
            </english>  
        </person>  
    </group>  
</classes>

The parsed result is shown as follows:

Let’s analyze the source code:

/**  
 * 用dom方式 解析xml 文件  
 * @param fileName  
 */  
    private String domXmlParse(String fileName) {  
        String str="";  
        // xml文档创建工厂  
        DocumentBuilderFactory docFactory = DocumentBuilderFactory  
                .newInstance();  
        // xml文档创建实例  
        DocumentBuilder docBuilder;  
        // xml文档  
        Document doc = null;  
        InputStream inStream = null;  
        try {  
            docBuilder = docFactory.newDocumentBuilder();  
            // 从assets文件夹下获取文件 转换成输入流  
            inStream = this.getResources().getAssets().open(fileName);  
            doc = docBuilder.parse(inStream);  
            // 获取xml跟元素  
            Element rootEle = doc.getDocumentElement();  
            // 二级父元素的list列表  
            NodeList groupNode = rootEle.getElementsByTagName("group");  
            // NodeList childNode = rootEle.getElementsByTagName("person");  
            // 遍历Classe下所有的group  
            for (int i = 0; i < groupNode.getLength(); i++) {  
  
                Element groupEle = (Element) groupNode.item(i);  
                String groupName = groupEle.getAttribute("name");  
                String num = groupEle.getAttribute("num");  
                str =str+"name ="+groupName+" num = "+num+"\n";  
                  
                Log.e("xml", "name = " + groupName + "  num = " + num);  
  
//              NodeList personNode = groupNode.item(i).getChildNodes();  
                NodeList personNode = groupEle.getElementsByTagName("person");  
                // 遍历group下的所有person  
                for (int j = 0; j < personNode.getLength(); j++) {  
                    Element personEle = (Element) personNode.item(j);  
                    String name = personEle.getAttribute("name");  
                    String age = personEle.getAttribute("age");  
                    str =str+"personName ="+name+" personAge = "+age+"\n";  
                      
                    Log.e("xml", "name = " + name + "   age = " + age);  
  
                    Element chineseEle = (Element) personEle  
                            .getElementsByTagName("chinese").item(0);  
                    Element englistEle = (Element) personEle  
                            .getElementsByTagName("english").item(0);  
                    String chinese = chineseEle.getFirstChild().getNodeValue();  
                    String english = englistEle.getFirstChild().getNodeValue();  
                    str =str+"chinese = "+chinese+" english = "+english+"\n";  
                      
                    Log.e("xml", "chinese = " + chinese + "   english = "  
                            + english);  
                }  
            }  
  
        } catch (ParserConfigurationException e1) {  
            e1.printStackTrace();  
        } catch (IOException e) {  
            e.printStackTrace();  
        } catch (SAXException e) {  
            e.printStackTrace();  
        }  
        return str;  
    }

Defines a set of interfaces for the parsed version of an XML document. The parser reads in the entire document and builds a memory-resident tree structure that code can then manipulate using the DOM interface. Advantages: The entire document tree is in memory, easy to operate; supports multiple functions such as deletion, modification, and rearrangement; Disadvantages: Transferring the entire document into memory (including useless nodes) wastes time and space; Usage occasions: Once parsed Documents also need to access this data multiple times; hardware resources are sufficient (memory, CPU).

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