java - 解析 XML 文件时出现异常

Question

当我调用 mehtod getIdFromDatabase 从我的 XML 数据库获取 id 时，但显示异常 [ fatal error ] :1:1:序言中不允许内容。

调用方法getIdFromDatabase:

nameLayer =getIdLayerFromDatabase("//Project/Layer[Name="+"'"+Name+"'"+"]/@idLayer","ProjectDataBase.xml");

java中的方法:

 public int getIdFromDatabase(String PathXPath, String Path) throws JAXBException {
            int maxid = -1, id = -1;
            DocumentBuilderFactory domFactory = DocumentBuilderFactory.newInstance();
            try {
                DocumentBuilder builder = domFactory.newDocumentBuilder();
                //***** exception here****************************** 
                Document dDoc = builder.parse(new InputSource(new ByteArrayInputStream(Path.getBytes("UTF-8"))));
                XPath xPath = XPathFactory.newInstance().newXPath();
                NodeList nl = (NodeList) xPath.evaluate(PathXPath, dDoc, XPathConstants.NODESET);
                for (int i = 0; i < nl.getLength(); i++) {
                    id = Integer.parseInt(nl.item(i).getNodeValue());
                }

            } catch (Exception e) {
                e.printStackTrace();
            }
            return id;
        }

XML 文件:

<?xml version="1.0" encoding="UTF-8"?>
<Project xmlns="http://www.example.org/ProjectDataBase" name="شئؤ" location="Projects//شئؤ//ProjectDataBase.xml" CreationDate="2014-07-20">
   <Layer idLayer="0">
      <Name>طبقة  1</Name>
   </Layer>
</Project>

Answer 1

问题是您正在尝试解析路径而不是文件。更改行:

Document dDoc = builder.parse(new InputSource(new ByteArrayInputStream(Path.getBytes("UTF-8"))));

作者:

Document dDoc = builder.parse(new FileInputStream(Path));