dom4j读写XML文件

XML文件格式：

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

<company> 

    <employee name="zhangsan" value="张三"/>  

    <employee name="lisi" value="李四"/>  

    <employee name="wangwu" value="王五"/>  

</company>

 

dom4j读写方法：

/**

     * 读取

     */

    public static void read() {

        try {

            File xmlFile = new File("d://company.xml");

            Document document = new SAXReader().read(xmlFile);

            List<Element> elements = document.selectNodes("/company/employee");

            for (Element element : elements) {

                String name = element.attributeValue("name");

                String value = element.attributeValue("value");

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

            }

        } catch (Exception e) {

            e.printStackTrace();

        }

    }



    /**

     * 写入

     */

    public static void write() {

        FileOutputStream fileOutputStream = null;

        XMLWriter xmlWriter = null;

        try {

            File xmlFile = new File("d://company.xml");

            Document document = new SAXReader().read(xmlFile);

            // 获取根节点

            Element root = document.getRootElement();

            // 动态添加 <employee name="xiaohong" value="小红"/>

            Element employee = root.addElement("employee");

            employee.addAttribute("name", "xiaohong");

            employee.addAttribute("value", "小红");

            OutputFormat outputFormat = OutputFormat.createPrettyPrint();

            outputFormat.setEncoding("UTF-8");

            outputFormat.setIndent(true);

            outputFormat.setIndent("    ");// tab格

            outputFormat.setNewlines(true);// 换行

            fileOutputStream = new FileOutputStream(xmlFile);

            xmlWriter = new XMLWriter(fileOutputStream, outputFormat);

            xmlWriter.write(document);

        } catch (Exception e) {

            e.printStackTrace();

        } finally {

            if (xmlWriter != null) {

                try {

                    xmlWriter.close();

                } catch (IOException e) {

                }

            }

        }



    }

写入后XML格式：

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



<company> 

    <employee name="zhangsan" value="张三"/>  

    <employee name="lisi" value="李四"/>  

    <employee name="wangwu" value="王五"/>  

    <employee name="xiaohong" value="小红"/>

</company>

 注：所需包 dom4j-1.6.1.jar、jaxen-1.1.1.jar