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boolean exist = file.exists();
DocumentBuilderFactory domFactory = DocumentBuilderFactory
.newInstance();
domFactory.setIgnoringComments(true);
DocumentBuilder builder = domFactory.newDocumentBuilder();
Document doc = null;
if (exist) {
doc = builder.parse(file);
} else {
doc = builder.newDocument();
Element root = doc.createElement("Log");
doc.appendChild(root);
}
Element logTag = doc.createElement("LogTag");
Element timeValue = doc.createElement("Time");
Element msgValue = doc.createElement("Message");
Text time = doc.createTextNode(param.createTime);
Text message = doc.createTextNode(param.logMessage);
timeValue.appendChild(time);
msgValue.appendChild(message);
logTag.appendChild(timeValue);
logTag.appendChild(msgValue);
doc.getDocumentElement().appendChild(logTag);
if (!exist) {
TransformerFactory transformerFactory = TransformerFactory
.newInstance();
// step10:获得一个Transformer对象
Transformer transformer = transformerFactory.newTransformer();
// step11:把document对象用一个DOMSource对象包装起来
Source xmlSource = new DOMSource(doc);
// step12:建立一个存储目标对象
Result outputTarget = new StreamResult(file);
// step13:生成相应的xml文件
transformer.transform(xmlSource, outputTarget);
}else{
DOMSource source = new DOMSource(doc);
TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
StreamResult result = new StreamResult(file.getAbsolutePath());
transformer.transform(source, result);
}