我正在将内容写入xml文件。内容涉及人员，组织和名称。地点 。现在，如果文件不存在，则会创建一个新文件并将内容写入其中。此过程非常正常。
但是，如果文件已经存在，并且我尝试向其添加内容，我会得到：没有协议错误。
我想问题是将文件附加到已创建的XML文件中。经过一些搜索，我发现问题出在DocumentBuilder.parse（）上。所以我也尝试使用：
Document document = documentBuilder.parse（new InputSource（new StringReader（filename +“。xml”）））; 但仍然存在错误。
任何人都可以帮助我吗？ 这是我的代码：
public static void xml_writer(ArrayList<String> per_names,ArrayList<String> loc_names,ArrayList<String> org_names,String filename,Logger L,Logger L1)
{ File file = new File(filename+".xml");
// if file doesnt exists, then create it
if (!file.exists())
{
try {
DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
Document doc = docBuilder.newDocument();
Element rootElement = doc.createElement("Nouns");
doc.appendChild(rootElement);
Element staff = doc.createElement("Per_Names");
for (int i=0;i<per_names.size();i++)
{
rootElement.appendChild(staff);
Element firstname = doc.createElement("Name");
firstname.appendChild(doc.createTextNode(per_names.get(i)));
staff.appendChild(firstname);
}
staff = doc.createElement("Org_Names");
for (int i=0;i<org_names.size();i++)
{
rootElement.appendChild(staff);
Element firstname = doc.createElement("Name");
firstname.appendChild(doc.createTextNode(org_names.get(i)));
staff.appendChild(firstname);
}
staff = doc.createElement("Loc_Names");
for (int i=0;i<loc_names.size();i++)
{
rootElement.appendChild(staff);
Element firstname = doc.createElement("Name");
firstname.appendChild(doc.createTextNode(loc_names.get(i)));
staff.appendChild(firstname);
}
// write the content into xml file
TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
DOMSource source = new DOMSource(doc);
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
transformer.setOutputProperty(OutputKeys.METHOD,"xml");
StreamResult result = new StreamResult(file);
transformer.transform(source, result);
//System.out.println("File saved!");
L.info("writing to xml file successfull: "+filename);
}
catch (ParserConfigurationException pce) {
L.info("Error : writing to xml file unsuccessfull :"+filename);
L.info("Error : "+pce.getLocalizedMessage());
L1.info("Error : writing to xml file unsuccessfull :"+filename);
L1.info("Error : "+pce.getLocalizedMessage());
pce.printStackTrace();
}
catch (TransformerException tfe) {
L.info("Error : writing to xml file unsuccessfull :"+filename);
L.info("Error :"+tfe.getLocalizedMessage());
L1.info("Error : writing to xml file unsuccessfull :"+filename);
L1.info("Error :"+tfe.getLocalizedMessage());
tfe.printStackTrace();
}
}
else
{ try
{
System.out.println("filealready exists");
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
//Document document = documentBuilder.parse( new InputSource(new StringReader(filename+".xml")));//new InputSource((filename+".xml")));
Document document = documentBuilder.parse(filename+".xml");
Element root = document.getDocumentElement();
// Root Element
Element server = document.createElement("Per_Names");
for (int i=0;i<per_names.size();i++)
{
Element name = document.createElement("Name");
name.appendChild(document.createTextNode(per_names.get(i)));
server.appendChild(name);
root.appendChild(server);
}
server = document.createElement("Org_Names");
for (int i=0;i<org_names.size();i++)
{
Element name = document.createElement("Name");
name.appendChild(document.createTextNode(org_names.get(i)));
server.appendChild(name);
root.appendChild(server);
}
server = document.createElement("Loc_Names");
for (int i=0;i<loc_names.size();i++)
{
Element name = document.createElement("Name");
name.appendChild(document.createTextNode(loc_names.get(i)));
server.appendChild(name);
root.appendChild(server);
}
DOMSource source = new DOMSource(document);
TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
StreamResult result = new StreamResult(file);
transformer.transform(source, result);
L.info("writing output to xml successfull :"+filename);
}
catch (ParserConfigurationException pce) {
L.info("Error : writing to xml file unsuccessfull :"+filename);
L.info("Error : "+pce.getLocalizedMessage());
L1.info("Error : writing to xml file unsuccessfull :"+filename);
L1.info("Error : "+pce.getLocalizedMessage());
pce.printStackTrace();
}
catch (TransformerException tfe) {
L.info("Error : writing to xml file unsuccessfull :"+filename);
L.info("Error : "+tfe.getLocalizedMessage());
L1.info("Error : writing to xml file unsuccessfull :"+filename);
L1.info("Error : "+tfe.getLocalizedMessage());
tfe.printStackTrace();
} catch (SAXException e) {
L.info("Error : writing to xml file unsuccessfull :"+filename);
L.info("Error : "+e.getLocalizedMessage());
L1.info("Error : writing to xml file unsuccessfull :"+filename);
L1.info("Error : "+e.getLocalizedMessage());
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
L.info("Error : writing to xml file unsuccessfull :"+filename);
L.info("Error : "+e.getLocalizedMessage());
L1.info("Error : writing to xml file unsuccessfull :"+filename);
L1.info("Error : "+e.getLocalizedMessage());
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}