在java代码中创建xml文件

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package com.huawei.demo;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.PrintWriter;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import javax.xml.parsers.ParserConfigurationException;import javax.xml.transform.OutputKeys;import javax.xml.transform.Transformer;import javax.xml.transform.TransformerConfigurationException;import javax.xml.transform.TransformerException;import javax.xml.transform.TransformerFactory;import javax.xml.transform.dom.DOMSource;import javax.xml.transform.stream.StreamResult;import org.w3c.dom.Attr;import org.w3c.dom.Document;import org.w3c.dom.Element;import org.w3c.dom.Node;import org.w3c.dom.NodeList;import org.xml.sax.SAXException;public class ParseXml {          private static Document document;              public static void init() {            try {                DocumentBuilderFactory factory = DocumentBuilderFactory                        .newInstance();                DocumentBuilder builder = factory.newDocumentBuilder();                document = builder.newDocument();            } catch (ParserConfigurationException e) {                System.out.println(e.getMessage());            }        }            public static void createXml(String fileName) {            init();            Element root = document.createElement("configs");   //创建根节点            document.appendChild(root);                        /* 创建一个完成的节点，start */            Element item = document.createElement("item");            Attr name = document.createAttribute("name");            name.setValue("wifi_on");            item.setAttributeNode(name);            item.appendChild(document.createTextNode("1"));            root.appendChild(item);            //item.appendChild(document.createTextNode("wangchenyang"));            /*  end  */                        Element item1 = document.createElement("item");            Attr name1 = document.createAttribute("name");            item1.setAttribute("name", "eth_on");    //增加属性的另一种方法            item1.appendChild(document.createTextNode("1"));            root.appendChild(item1);                        //将DOM对象document写入到xml文件中            TransformerFactory tf = TransformerFactory.newInstance();            try {                Transformer transformer = tf.newTransformer();                DOMSource source = new DOMSource(document);                transformer.setOutputProperty(OutputKeys.ENCODING, "gb2312");                transformer.setOutputProperty(OutputKeys.INDENT, "yes");                PrintWriter pw = new PrintWriter(new FileOutputStream(fileName));                StreamResult result = new StreamResult(pw);                transformer.transform(source, result);     //关键转换                System.out.println("生成XML文件成功!");            } catch (TransformerConfigurationException e) {                System.out.println(e.getMessage());            } catch (IllegalArgumentException e) {                System.out.println(e.getMessage());            } catch (FileNotFoundException e) {                System.out.println(e.getMessage());            } catch (TransformerException e) {                System.out.println(e.getMessage());            }        }            public void parserXml(String fileName) {            try {                DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();                DocumentBuilder db = dbf.newDocumentBuilder();                Document document = db.parse(fileName);                                 NodeList employees = document.getChildNodes();                for (int i = 0; i < employees.getLength(); i++) {                    Node employee = employees.item(i);                    NodeList employeeInfo = employee.getChildNodes();                    for (int j = 0; j < employeeInfo.getLength(); j++) {                        Node node = employeeInfo.item(j);                        NodeList employeeMeta = node.getChildNodes();                        for (int k = 0; k < employeeMeta.getLength(); k++) {                            System.out.println(employeeMeta.item(k).getNodeName()                                    + ":" + employeeMeta.item(k).getTextContent());                        }                    }                }                System.out.println("解析完毕");            } catch (FileNotFoundException e) {                System.out.println(e.getMessage());            } catch (ParserConfigurationException e) {                System.out.println(e.getMessage());            } catch (SAXException e) {                System.out.println(e.getMessage());            } catch (IOException e) {                System.out.println(e.getMessage());            }        }}
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