DOM解析不适合于进行大数据文件的操作,DOM解析适合于对文件进行修改和随机存取的操作。
DOM生成
//判断一下是否存在sdcard
if(!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
//不存在
return;
}
File file = new File(Environment.getExternalStorageDirectory().toString()+File.separator+"xkdata"+File.separator+"member.xml");
if(!file.getParentFile().exists()) {
file.getParentFile().mkdirs();
}
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = null;
try {
builder = dbf.newDocumentBuilder();
} catch (ParserConfigurationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Document doc = builder.newDocument();
Element addresslist = doc.createElement("addresslist");
Element linkman = doc.createElement("linkman");
Element name = doc.createElement("name");
Element email = doc.createElement("email");
name.appendChild(doc.createTextNode(DomActivity.this.name.getText().toString()));
email.appendChild(doc.createTextNode(DomActivity.this.email.getText().toString()));
linkman.appendChild(name);
linkman.appendChild(email);
addresslist.appendChild(linkman);
doc.appendChild(addresslist);
//输出文档到文件中
TransformerFactory tf = TransformerFactory.newInstance();
Transformer t = null;
try {
t = tf.newTransformer();
} catch (TransformerConfigurationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
t.setOutputProperty(OutputKeys.ENCODING, "GBK");
DOMSource source = new DOMSource(doc);
StreamResult result = new StreamResult(file);
try {
t.transform(source, result);
} catch (TransformerException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
DOM解析
//判断一下是否存在sdcard
if(!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
//不存在
return;
}
File file = new File(Environment.getExternalStorageDirectory().toString()+File.separator+"xkdata"+File.separator+"member.xml");
if(!file.exists()) {
return;
}
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = null;
try {
builder = dbf.newDocumentBuilder();
} catch (ParserConfigurationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Document doc = null;
try {
doc = builder.parse(file);
} catch (SAXException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
NodeList nl = doc.getElementsByTagName("linkman");
for(int i=0;i<nl.getLength();i++){
Element e = (Element)nl.item(i);
DomReadActivity.this.name.setText(e.getElementsByTagName("name").item(0).getFirstChild().getNodeValue());
DomReadActivity.this.email.setText(e.getElementsByTagName("email").item(0).getFirstChild().getNodeValue());
}