Java-读取XML文件

Question

我试图从XML文件中读取一些数据，但遇到麻烦，我拥有的XML如下：

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

<EmailSettings>
    <recipient>[e-mail]</recipient>
    <sender>[e-mail]</sender>
    <subject>Sales Query</subject>
    <description>email body message</description>
</EmailSettings>

我试图将这些值作为字符串读取到我的Java程序中，到目前为止，我已经编写了以下代码：

private static Document getDocument (String filename){
    try {

        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

        factory.setIgnoringComments(true);
        factory.setIgnoringElementContentWhitespace(true);
        factory.setValidating(false);

        DocumentBuilder builder = factory.newDocumentBuilder();
        return builder.parse(new InputSource(filename));        
    }
    catch (Exception e){
        System.out.println("Error reading configuration file:");
        System.out.println(e.getMessage());
    }
    return null;
}

Document doc = getDocument(configFileName);

Element config = doc.getDocumentElement();

我正在努力读取实际的字符串值。

Answer 1

可能的实现之一：

File file = new File("userdata.xml");
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory
        .newInstance();
DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
Document document = documentBuilder.parse(file);
String usr = document.getElementsByTagName("user").item(0).getTextContent();
String pwd = document.getElementsByTagName("password").item(0).getTextContent();

与XML内容一起使用时：

<credentials>
    <user>testusr</user>
    <password>testpwd</password>
</credentials>

结果"testusr"并"testpwd"分配给上述usr和pwd参考。