POPTEST老李分享DOM解析XML之java

POPTEST老李分享DOM解析XML之java

 

Java提供了两种XML解析器：树型解释器DOM（Document Object Model，文档对象模型），和流机制解析器SAX（Simple API for XML，XML简单API）。DOM可以将XML转换为树结构。

XML文档内容如下：

文件名：NameList.xml，文件路径：C:\Users\Tsybius\Desktop\NameList.xml

<?xml version="1.0" encoding="UTF-8"?>

<root>

  <list1>

    <person id="101" name="Tsybius" remark="1" />

    <person id="102" name="Galatea" remark="2" />

    <person id="103" name="Quintus" remark="3" />

    <person id="104" name="Atia" remark="4" />

    <person id="105" name="Justitia" remark="5" />

  </list1>

  <list2>

    <person id="201" name="Zhang" remark="a" />

    <person id="202" name="Wang" remark="b" />

    <person id="203" name="Li" remark="c" />

    <person id="204" name="Zhao" remark="d" />

    <person id="205" name="Liu" remark="e" />

  </list2>

  <text>TEXT</text>

</root>

Java代码如下：

package XmlDomTest;

 

import java.io.File;

import java.io.IOException;

 

import javax.xml.parsers.DocumentBuilder;

import javax.xml.parsers.DocumentBuilderFactory;

import javax.xml.parsers.ParserConfigurationException;

 

import org.w3c.dom.Document;

import org.w3c.dom.Element;

import org.w3c.dom.NamedNodeMap;

import org.w3c.dom.Node;

import org.w3c.dom.NodeList;

import org.w3c.dom.Text;

import org.xml.sax.SAXException;

 

/**

 * 使用DOM解析XML

 * @author Tsybius

 *

 */

public class XmlDomTest {

     

    /**

     * 使用DOM解析XML

     * @param args

     */

    public static void main(String[] args) {

 

        try {

             

            String filePath = "C:\\Users\\Tsybius\\Desktop\\NameList.xml";

            File f = new File(filePath);

 

            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

            DocumentBuilder builder = factory.newDocumentBuilder();

            Document doc = builder.parse(f);

             

            //遍历节点方式1

            Element root = doc.getDocumentElement();

            System.out.println("根节点名：" + root.getNodeName());

            NodeList children = root.getChildNodes();

            for (int i = 0; i < children.getLength(); i++) {

                Node child = children.item(i);

                if (child instanceof Element) {

                    Element childElement = (Element)child;

                    System.out.println("节点名：" + childElement.getNodeName());

                     

                    if (childElement.getNodeName().equals("list1")) {

                        //list1

                        //遍历节点方式2

                        //获取指定属性

                        for (Node list1Node = childElement.getFirstChild(); 

                                list1Node != null;

                                list1Node = list1Node.getNextSibling()) {

                            if (list1Node instanceof Element) {

                                Element list1Element = (Element)list1Node;

                                System.out.print("person:");

                                System.out.print("id=" + list1Element.getAttribute("id") + ";");

                                System.out.print("name=" + list1Element.getAttribute("name") + ";");

                                System.out.print("remark=" + list1Element.getAttribute("remark") + ";");

                                System.out.println();

                            }

                        }

                         

                    } else if (childElement.getNodeName().equals("list2")) {

                        //list2

                        //遍历节点方式2

                        //遍历所有属性

                        for (Node list2Node = childElement.getFirstChild(); 

                                list2Node != null;

                                list2Node = list2Node.getNextSibling()) {

                            if (!(list2Node instanceof Element)) {

                                continue;

                            }

                            NamedNodeMap attributes = ((Element)list2Node).getAttributes();

                            System.out.print("person:");

                            for (int counter = 0; counter < attributes.getLength(); counter++) {

                                Node attribute = attributes.item(counter);

                                if (attribute == null) {

                                    continue;

                                }

                                String name = attribute.getNodeName();

                                String value = attribute.getNodeValue();

                                System.out.print(name + "=" + value + ";");

                            }

                            System.out.println();

                        }

                         

                    } else if (childElement.getNodeName().equals("text")) {

                        //text

                        //获取文本值

                        Text textNode = (Text)childElement.getFirstChild();

                        String text = textNode.getData().trim();

                        System.out.println("text：" + text);

                    }

                }

            }

 

        } catch (ParserConfigurationException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        } catch (SAXException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        } catch (IOException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        } catch (Exception e) {

            e.printStackTrace();

        }

         

    }

}

控制台中输出结果如下：

根节点名：root
节点名：list1
person:id=101;name=Tsybius;remark=1;
person:id=102;name=Galatea;remark=2;
person:id=103;name=Quintus;remark=3;
person:id=104;name=Atia;remark=4;
person:id=105;name=Justitia;remark=5;
节点名：list2
person:id=201;name=Zhang;remark=a;
person:id=202;name=Wang;remark=b;
person:id=203;name=Li;remark=c;
person:id=204;name=Zhao;remark=d;
person:id=205;name=Liu;remark=e;
节点名：text
text：TEXT