how to parse xml using DOM in java

Question

i use this code to parse a xml data in java but give me a errors:

    Informations info=new Informations();
    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    conn.setRequestMethod("GET");
    conn.setRequestProperty("Accept", "application/XML");
    String xml="";
    xml = readUrl(conn);     
      DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = dbf.newDocumentBuilder();
        InputSource is = new InputSource();
        is.setCharacterStream(new StringReader(xml));
        Document dom = db.parse(is);
        Element root = dom.getDocumentElement();
        NodeList items = root.getElementsByTagName("deal");


        //----titre
        NodeList titre = dom.getElementsByTagName("titre");
        Element line = (Element) titre.item(0);
        info.setTitre(getCharacterDataFromElement(line));
        System.out.println("Titre: " + info.getTitre());
       //----reduction
        NodeList reduction = dom.getElementsByTagName("reduction");
        line = (Element) reduction.item(0);
        info.setReduction(getCharacterDataFromElement(line));
        System.out.println("Reduction: " + info.getReduction());

this is the xml data:

<xml version="1.0" encoding="UTF-8">
<deals>
 <deal>
  <type>Occasion</type>
  <datedebutdeal>0000-00-00 00:00:00</datedebutdeal>
  <datefindeal>2014-04-30 00:00:00</datefindeal>  
  <reduction>25.93</reduction>
  <titre>A4</titre>
 </deal>
</deals>

its give me this errors in this part in the code :

  Document dom = db.parse(is);

this is the error:

[Fatal Error] :2069:1: XML document structures must start and end within the same   entity.
org.xml.sax.SAXParseException: XML document structures must start and end within the same entity.
at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(Unknown Source)

thanks for any help.

Answer 1

xml的第一行必须为<?xml version="1.0" encoding="UTF-8"?> ，否则它将被视为标签，因此会出现错误。

Answer 2

The first line of your XML is incorrect. Change it to <?xml version="1.0" encoding="UTF-8"?>

Answer 3

You could replace first line of xml by adding xml = xml.replaceFirst("<xml version=\\"1.0\\" encoding=\\"UTF-8\\">", "<?xml version=\\"1.0\\" encoding=\\"UTF-8\\"?>"); after xml = readUrl(conn); .

Answer 4

Two workarounds: Just before the sentence: Document dom = db.parse(is); you should read entire inputstream in a string and remove the invalid line . Otherwise, if server don't resolve the bug, you can replace the first line with