java基础---->java自带的xml解析

　　在查看公司框架的源码的时候，发现框架用的是jdk自带的xml解析。今天，想着对它总结一下。从未放弃过爱你，只是从浓烈变得悄无声气。

利用jdk自带的xml创建文档

一、 CreateXmlFile类如下：

package com.huhx.saxxml;

import java.io.FileOutputStream;
import java.io.PrintWriter;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
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;

public class CreateXmlFile {

    public static void parseXml(String path) {
        DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
        try {
            DocumentBuilder dombuilder = builderFactory.newDocumentBuilder();
            Document document = dombuilder.newDocument();
            Element root = document.createElement("persons");
            document.appendChild(root);

            // 第一个人
            Element person1 = document.createElement("person");
            person1.setAttribute("name", "Linux");
            root.appendChild(person1);

            Element sex = document.createElement("sex");
            sex.appendChild(document.createTextNode("女"));
            person1.appendChild(sex);

            Element address = document.createElement("address");
            address.appendChild(document.createTextNode("湖北"));
            person1.appendChild(address);

            Element phoneNumber = document.createElement("phone");
            phoneNumber.appendChild(document.createTextNode("155124578**"));
            person1.appendChild(phoneNumber);

            // 第二个人
            Element person2 = document.createElement("person");
            person2.setAttribute("name", "Huhx");
            root.appendChild(person2);

            Element sex2 = document.createElement("sex");
            sex2.appendChild(document.createTextNode("男"));
            person2.appendChild(sex2);

            Element address2 = document.createElement("address");
            address2.appendChild(document.createTextNode("湖南"));
            person2.appendChild(address2);

            Element phoneNumber2 = document.createElement("phone");
            phoneNumber2.appendChild(document.createTextNode("155124578**"));
            person2.appendChild(phoneNumber2);

            // 将上述的document写入到文件中
            TransformerFactory tf = TransformerFactory.newInstance();
            Transformer transformer = tf.newTransformer();
            DOMSource source = new DOMSource(document);
            transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
            transformer.setOutputProperty(OutputKeys.STANDALONE, "yes");
            transformer.setOutputProperty(OutputKeys.INDENT, "yes");
            PrintWriter pw = new PrintWriter(new FileOutputStream(path));
            StreamResult result = new StreamResult(pw);
            transformer.transform(source, result);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        parseXml("text.xml");
    }
}

二、 生成的text.xml文件如下：

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<persons>
    <person name="Linux">
        <sex>女</sex>
        <address>湖北</address>
        <phone>155124578**</phone>
    </person>
    <person name="Huhx">
        <sex>男</sex>
        <address>湖南</address>
        <phone>155124578**</phone>
    </person>
</persons>

利用jdk自带的xml解析文档

一、 ReadXmlFile.java类的内容如下：

package com.huhx.saxxml;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

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

public class ReadXmlFile {
    public static void readXml(String path) {
        try {
            DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = builderFactory.newDocumentBuilder();

            Document document = builder.parse(path);
            Element rootElement = document.getDocumentElement();
            System.out.println("根元素：" + rootElement.getNodeName());

            NodeList childNodes = rootElement.getElementsByTagName("person");
            for (int i = 0; i < childNodes.getLength(); i++) {
                Element element = (Element) childNodes.item(i);
                String name = element.getAttribute("name");
                String content = element.getElementsByTagName("sex").item(0).getFirstChild().getNodeValue();
                String address = element.getElementsByTagName("address").item(0).getFirstChild().getNodeValue();
                String phone = element.getElementsByTagName("phone").item(0).getFirstChild().getNodeValue();
                System.out.println("name: " + name + ", content: " + content + ", address: " + address + ", phone: " + phone);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        readXml("text.xml");
    }
}

二、控制台打印结果如下：

根元素：persons
name: Linux, content: 女, address: 湖北, phone: 155124578**
name: Huhx, content: 男, address: 湖南, phone: 155124578**

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