使用jaxp对xml文件进行增删改查以及遍历操作

本文通过使用jaxp的方式来实现对于xml文件的增删改查操作，以最基础和简单的来做为实例，所操作的xml文件为person.xml，代码如下：

<?xml version="1.0" encoding="UTF-8" standalone="no"?><person>
<p1>
<name>nike</name>
<age>23</age>
</p1>
<p1>
<name>tom</name>
<age>25</age>
</p1>
</person>

因为方便的关系，这里将这些操作放在同一个java文件中，通过函数的方式进行调用，代码如下：

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;

public class Textjaxp {

    public static void main(String[] args) throws Exception {

        //getNameValue(); //获取xml中标的签值
        //getSingleNameValue(); //获取xml中某个标签值
        //addNode(); //添加节点
        //removeNode(); //修改节点
        //deleteNode(); //删除节点
        showAllNodeName(); //遍历所有节点，使用递归的思想

    }



    private static void showAllNodeName() throws Exception {
        DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
        //创建Xml解析器工厂

        DocumentBuilder builder = builderFactory.newDocumentBuilder();
        //创建Xml解析器
        Document doc = builder.parse("src/person.xml");
        //解析xml返回document
        show(doc);

    }



    private static void show(Node node) {
        if(node.getNodeType()==Node.ELEMENT_NODE){
        System.out.println(node.getNodeName());
        }
        //判断是否为节点
        NodeList list = node.getChildNodes();

        for(int i=0;i<list.getLength();i++)
        {
            Node node1 = list.item(i);

            show(node1);//递归调用


        }

    }




    private static void deleteNode() throws Exception {
        DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();

        DocumentBuilder builder = builderFactory.newDocumentBuilder();

        Document doc = builder.parse("src/person.xml");

        NodeList list = doc.getElementsByTagName("sex");

        Node sex = list.item(0);

        Node parent = sex.getParentNode();

        parent.removeChild(sex);
        //xml回写（只要xml文件有改动都需要回写操作，否则结果不会改动xml文件）
        TransformerFactory transformerFactory = TransformerFactory.newInstance();

        Transformer transformer = transformerFactory.newTransformer();

        transformer.transform(new DOMSource(doc), new StreamResult("src/person.xml"));
    }




    private static void removeNode() throws Exception {
        DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();

        DocumentBuilder builder = builderFactory.newDocumentBuilder();

        Document doc = builder.parse("src/person.xml");

        NodeList list = doc.getElementsByTagName("sex");

        Node sex1 = list.item(0);

        sex1.setTextContent("nan");

        TransformerFactory transformerFactory = TransformerFactory.newInstance();

        Transformer transformer = transformerFactory.newTransformer();

        transformer.transform(new DOMSource(doc), new StreamResult("src/person.xml"));
    }




    private static void addNode() throws Exception {
        DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();

        DocumentBuilder builder = builderFactory.newDocumentBuilder();

        Document document = builder.parse("src/person.xml");

        NodeList list = document.getElementsByTagName("p1");

        Node p1 = list.item(0);

        Element sex1 = document.createElement("sex");

        Text text1 = document.createTextNode("nv");

        sex1.appendChild(text1);

        p1.appendChild(sex1);

        TransformerFactory transformerFactory = TransformerFactory.newInstance();

        Transformer transformer = transformerFactory.newTransformer();

        transformer.transform(new DOMSource(document), new StreamResult("src/person.xml"));

    }




    private static void getSingleNameValue() throws Exception {
        DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();

        DocumentBuilder builder = builderFactory.newDocumentBuilder();

        Document doc = builder.parse("src/person.xml");

        NodeList list = doc.getElementsByTagName("name");

        Node name = list.item(0);

        String nameValue = name.getTextContent();

        System.out.println(nameValue); 
    }




    private static void getNameValue() throws Exception {
        // TODO Auto-generated method stub
        DocumentBuilderFactory buliBuilderFactory = DocumentBuilderFactory.newInstance();

        DocumentBuilder builder = buliBuilderFactory.newDocumentBuilder();

        Document document =  builder.parse("src/person.xml");

        NodeList names = document.getElementsByTagName("name");

        for(int i =0;i<names.getLength();i++)
        {
            Node name = names.item(i);

            String namevalue = name.getTextContent();

            System.out.println(namevalue);
        }
    }

}