我基本上被我的 DOM 对象和我想要的数据困住了,我正试图将它输出到一个字符串。这里是我用来解析我的 xml 文件的代码:
public ORGRTools insertUserNameAndPassword(String userName, String password)
{
try {
DocumentBuilderFactory factory= DocumentBuilderFactory.newInstance();
docBuilder = factory.newDocumentBuilder();
dom = docBuilder.parse (new File("/mnt/sdcard/Commands.xml"));
NodeList items = dom.getElementsByTagName("login");
for (int i = 0; i < items.getLength(); i++) {
Node item = items.item(i);
NodeList properties = item.getChildNodes();
for (int j = 0; j < properties.getLength(); j++) {
Node property = properties.item(j);
String name = property.getNodeName();
if (name.equalsIgnoreCase("userName")) {
property.getFirstChild().setNodeValue(userName);
}
if (name.equalsIgnoreCase("password")) {
property.getFirstChild().setNodeValue(password);
}
}
}
} catch (SAXException e) {
// TODO Auto-generated catch block
//invalid character in xml
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ParserConfigurationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return this;
}
话虽如此,我有以下函数,它使用上述代码中的成员变量 dom 来尝试获取其字符串表示形式:
public String serialize()
{
try
{
DOMSource domSource = new DOMSource(dom);
StringWriter writer = new StringWriter();
StreamResult result = new StreamResult(writer);
TransformerFactory tf = TransformerFactory.newInstance();
Transformer transformer = tf.newTransformer();
transformer.transform(domSource, result);
String retVal= writer.toString();
return retVal;
}
catch(TransformerException ex)
{
//exception here but does not print stack trace... weird
ex.printStackTrace();
return null;
}
}
但是,我得到以下异常(见评论)。有谁知道发生了什么?为什么转换为字符串失败?我已经被困了几个小时,所以任何帮助都会很好。任何 API 级别都可以。
谢谢!--Edit-- 这是我要处理的结构。基本上,想法是使用 .apk 安装这些模型之一,并让这些模型与服务器通信。所以我需要填写用户凭证数据:
<commands>
<login>
<userName>itemstr</userName>
<password>itemstr</password>
</login>
<analyse>
<imageName>itemstr</imageName>
<imageHeight>itemnum</imageHeight>
<imageWidth>itemnum</imageWidth>
<recordID>itemstr</recordID>
</analyse>
<retrieve>
<record>itemnum</record>
</retrieve>