我试图在Android应用程序中使用API作为我们的计费系统，但我无法弄清楚如何解析它返回的XML。这是我的功能到目前为止的样子......
public void ParseData(String xmlData)
{
try
{
// Document Builder
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder db = factory.newDocumentBuilder();
// Input Stream
InputSource inStream = new InputSource();
inStream.setCharacterStream(new StringReader(xmlData));
// Parse Document into a NodeList
Document doc = db.parse(inStream);
NodeList nodes = doc.getElementsByTagName("ticket");
// Loop NodeList and Retrieve Element Data
for(int i = 0; i < nodes.getLength(); i++)
{
Node node = nodes.item(i);
if (node instanceof Element)
{
Element child = (Element)node;
String id = child.getAttribute("id");
}
}
}
catch(SAXException e)
{
}
}
这是返回的XML数据的样子。我需要循环遍历每个元素并拉出每个元素，但我无法弄清楚如何使用DOM解析器。
<whmcsapi>
<action>gettickets</action>
<result>success</result>
<totalresults>1</totalresults>
<startnumber>0</startnumber>
<numreturned>1</numreturned>
<tickets>
<ticket>
<id>1</id>
<tid>557168</tid>
<deptid>1</deptid>
<userid>1</userid>
<name><![CDATA[Array]]></name>
<email></email>
<cc></cc>
<c>TmDEga5v</c>
<date>2009-08-03 23:14:32</date>
<subject><![CDATA[Test Ticket]]></subject>
<message><![CDATA[This is a test ticket>
----------------------------
IP Address: xxx.xxx.xxx.xxx]]></message>
<status>Open</status>
<priority>Medium</priority>
<admin></admin>
<attachment></attachment>
<lastreply>2009-08-04 12:14:18</lastreply>
<flag>0</flag>
<service></service>
</ticket>
</tickets>
</whmcsapi>
是的SAX解析器是解决方案，这是让您入门的基本代码：
void parseExampleFunction(){
SAXParserFactory spf = SAXParserFactory.newInstance();
SAXParser sp = spf.newSAXParser();
XMLReader xr = sp.getXMLReader();
File myFile = new File( //the XML file which you need to parse );
myFile.createNewFile();
FileInputStream fOut = new FileInputStream(myFile);
BufferedInputStream bos = new BufferedInputStream( fOut );
/** Create handler to handle XML Tags ( extends DefaultHandler ) */
MessagesXMLHandler myXMLHandler = new MessagesXMLHandler(context);
xr.setContentHandler(myXMLHandler);
xr.parse(new InputSource(bos));
}
// the class where the parsing logic needs to defined.This preferably can be in a different .java file
public class MessagesXMLHandler extends DefaultHandler{
//this function is called automatically when a start tag is encountered
@Override
public void startElement(String uri, String localName, String qName,Attributes attributes) throws SAXException
//variable localName is the name of the tag
//this function is called autiomatically when an end tag is encountered
@Override
public void endElement(String uri, String localName, String qName) throws SAXException {
}
//this function gets called to return the value stored betweeen the closing and opening tags
@Override
public void characters(char[] ch, int start, int length) throws SAXException {
//now variable value has the value stored between the closing and opening tags
String value=new String(ch,start,length);
}
}
对于android最好的方法解析xml就是使用SAXParser。我用演示解释了它......
首先创建您的活动类，如下所示。
public class ActivityForSax extends ListActivity {
private ProgressDialog pDialog;
private ItemXMLHandler myXMLHandler;
private String rssFeed = "https://www.dropbox.com/s/t4o5wo6gdcnhgj8/imagelistview.xml?dl=1";
private TextView textview;
private ListView mListView;
private ArrayList<HashMap<String, String>> menuItems;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.xml_dom);
textview = (TextView)findViewById(R.id.textView1);
doParsing();
mListView = getListView();
}
public void doParsing(){
if (isNetworkAvailable()) {
textview.setText("Loading...Please wait...");
new AsyncData().execute(rssFeed);
} else {
showToast("No Network Connection!!!");
}
}
class AsyncData extends AsyncTask<String, Void, Void> {
@Override
protected void onPreExecute() {
menuItems = new ArrayList<HashMap<String, String>>();
pDialog = new ProgressDialog(ActivityForSax.this);
pDialog.setTitle("Loading....");
pDialog.setMessage("Please wait...");
pDialog.show();
super.onPreExecute();
}
@Override
protected Void doInBackground(String... params) {
try {
SAXParserFactory spf = SAXParserFactory.newInstance();
SAXParser sp = spf.newSAXParser();
XMLReader xr = sp.getXMLReader();
myXMLHandler = new ItemXMLHandler();
xr.setContentHandler(myXMLHandler);
URL _url = new URL(params[0]);
xr.parse(new InputSource(_url.openStream()));
} catch (ParserConfigurationException pce) {
Log.e("SAX XML", "sax parse error", pce);
} catch (SAXException se) {
Log.e("SAX XML", "sax error", se);
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
textview.setText("Done!!!");
if (pDialog != null && pDialog.isShowing()) {
pDialog.dismiss();
}
ArrayList<Bean> itemsList = myXMLHandler.getItemsList();
for (int i = 0; i < itemsList.size(); i++) {
Bean objBean = itemsList.get(i);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put("TITLE :: ", objBean.getTitle());
map.put("DESC :: ", objBean.getDesc());
map.put("PUBDATE :: ", objBean.getPubDate());
// adding HashList to ArrayList
menuItems.add(map);
}
// Adding menuItems to ListView
ListAdapter adapter = new SimpleAdapter(ActivityForSax.this, menuItems,
R.layout.list_item,
new String[] { "TITLE :: ", "DESC :: ", "PUBDATE :: " }, new int[] {
R.id.name, R.id.email, R.id.mobile });
mListView.setAdapter(adapter);
}
}
public void showToast(String msg) {
Toast.makeText(ActivityForSax.this, msg, Toast.LENGTH_LONG).show();
}
public boolean isNetworkAvailable() {
ConnectivityManager connectivity = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
if (connectivity == null) {
return false;
} else {
NetworkInfo[] info = connectivity.getAllNetworkInfo();
if (info != null) {
for (int i = 0; i < info.length; i++) {
if (info[i].getState() == NetworkInfo.State.CONNECTED) {
return true;
}
}
}
}
return false;
}
}
现在您需要创建用于解析xml数据的默认处理程序类。
public class ItemXMLHandler extends DefaultHandler {
Boolean currentElement = false;
String currentValue = "";
Bean item = null;
private ArrayList<Bean> itemsList = new ArrayList<Bean>();
public ArrayList<Bean> getItemsList() {
return itemsList;
}
// Called when tag starts
@Override
public void startElement(String uri, String localName, String qName,
Attributes attributes) throws SAXException {
currentElement = true;
currentValue = "";
if (localName.equals("item")) {
item = new Bean();
}
}
// Called when tag closing
@Override
public void endElement(String uri, String localName, String qName)
throws SAXException {
currentElement = false;
if (localName.equals("id")) {
item.setId(currentValue);
} else if (localName.equals("title")) {
item.setTitle(currentValue);
} else if (localName.equals("desc")) {
item.setDesc(currentValue);
} else if (localName.equals("pubDate")) {
item.setPubDate(currentValue);
} else if (localName.equals("link")) {
item.setLink(currentValue);
} else if (localName.equals("item")) {
itemsList.add(item);
}
}
// Called to get tag characters
@Override
public void characters(char[] ch, int start, int length)
throws SAXException {
if (currentElement) {
currentValue = currentValue + new String(ch, start, length);
}
}
}
最后你的Bean类就像......
public class Bean {
private String id;
private String title;
private String desc;
private String pubDate;
private String link;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getDesc() {
return desc;
}
public void setDesc(String desc) {
this.desc = desc;
}
public String getPubDate() {
return pubDate;
}
public void setPubDate(String pubDate) {
this.pubDate = pubDate;
}
public String getLink() {
return link;
}
public void setLink(String link) {
this.link = link;
}
}
java-json.jarlibs/java-json.jar'）//将此行添加到您的构建中以下是将xml响应转换为json响应的代码：
JSONObject jsonObj = null;
try {
jsonObj = XML.toJSONObject(response.toString());
} catch (JSONException e) {
Log.e("JSON exception", e.getMessage());
e.printStackTrace();
}