java - Xml 文档读取尝试错误

Question

在我的软件中，我试图创建一个返回 xml 文件任何位的类，看看代码和它给我的错误，我不知道如何纠正它:(

XML:

<everConfigured>
  <value>false</value>
</everConfigured>

<ServerPort>
  <value>9000</value>
</ServerPort>

<ClientPort>
  <value>8000</value>
</ClientPort>

XML 阅读器类:

 public static String getValue(String Path,String Tag,String Atribute) throws IOException, SAXException, ParserConfigurationException
    {
        File fXmlFile = new File(Path);
    DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
    DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
    Document doc = dBuilder.parse(fXmlFile);
        doc.getDocumentElement().normalize();
        NodeList nList = doc.getElementsByTagName(Tag);
        Node nNode = nList.item(0);
        Element eElement = (Element) nNode;
        return eElement.getAttribute(Atribute);
    }

我是这样调用它的:

public static void main(String[] args) throws SocketException, IOException, SAXException, ParserConfigurationException {
       System.out.println(
            XMLRead.getValue("/home/ghhwer/Desktop/settings.xml", "everConfigured","value"));
    }

但返回此错误:

[Fatal Error] settings.xml:5:2: The markup in the document following the root element must be well-formed.
Exception in thread "main" org.xml.sax.SAXParseException; systemId: file:/home/ghhwer/Desktop/settings.xml; lineNumber: 5; columnNumber: 2; The markup in the document following the root element must be well-formed.
    at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:257)
    at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:348)
    at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:205)
    at program.XMLRead.getValue(XMLRead.java:20)
    at program.Start.main(Start.java:12)

Answer 1

The markup in the document following the root element must be well-formed.

XML 的格式良好有几个规则:

1. 所有 XML 元素都必须有结束标记；
2. 标签大小写应相同；
3. XML 元素必须正确嵌套；
4. XML 文档必须有根元素；
5. XML 属性值必须加引号；
6. 某些符号具有特殊含义，必须转义(>、<、&、'、")。

在提供的 XML 片段中缺少根元素，这就是解析器提示的原因。因此，格式良好的 XML 将是:

<?xml version="1.0" encoding="UTF-8"?>
<config>    
    <everConfigured>
       <value>false</value>
    </everConfigured>

    <ServerPort>
      <value>9000</value>
    </ServerPort>

    <ClientPort>
       <value>8000</value>
    </ClientPort>
 </config>

参见http://www.w3schools.com/xml/xml_syntax.asp作为 XML 语法引用。