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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