我想在我的xml文件的特定标签下获取值（通过url访问），如下所示：
<SyncLoginResponse>
<Videos>
<Video>
<name>27/flv</name>
<title>scooter</title>
<url>http://dev2.somedomain.com/tabletcms/tablets/tablet_content/000002/videos/</url>
<thumbnail>http://dev2.somedomain.com/tabletcms/tablets/tablet_content/000002/thumbnails/106/jpg</thumbnail>
</Video>
<Video>
<name>26/flv</name>
<title>barsNtone</title>
<url>http://dev2.somedomain.com/tabletcms/tablets/tablet_content/000002/videos/</url>
<thumbnail>http://dev2.somedomain.com/tabletcms/tablets/tablet_content/000002/thumbnails/104/jpg</thumbnail>
</Video>
</Videos>
<Slideshows>
<Slideshow>
<name>44</name>
<title>ProcessFlow</title>
<pages>4</pages>
<url>http://dev2.somedomain.com/tabletcms/tablets/tablet_content/000002/slideshows/</url>
</Slideshow>
</Slideshows>
<SyncLoginResponse>
如您所见，视频下方有“名称”标签，幻灯片下还有“名称”标签以及“标题”和“网址”。我想在幻灯片标签下获取值。
到目前为止，我有以下代码：
EngagiaSync.java：
package com.example.engagiasync;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Iterator;
import java.util.List;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;
import android.app.Activity;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.widget.TextView;
public class EngagiaSync extends Activity {
public static final int DIALOG_DOWNLOAD_PROGRESS = 0;
private ProgressDialog mProgressDialog;
public String FileName = "";
public String FileURL = "";
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
/* Create a new TextView to display the parsingresult later. */
TextView tv = new TextView(this);
tv.setText("...PARSE AND DOWNLOAD...");
try {
/* Create a URL we want to load some xml-data from. */
URL url = new URL("http://somedomain.com/tabletcms/tablets/sync_login/jayem30/jayem");
url.openConnection();
/* Get a SAXParser from the SAXPArserFactory. */
SAXParserFactory spf = SAXParserFactory.newInstance();
SAXParser sp = spf.newSAXParser();
/* Get the XMLReader of the SAXParser we created. */
XMLReader xr = sp.getXMLReader();
/* Create a new ContentHandler and apply it to the XML-Reader*/
ExampleHandler myExampleHandler = new ExampleHandler();
xr.setContentHandler(myExampleHandler);
/* Parse the xml-data from our URL. */
xr.parse(new InputSource(url.openStream()));
/* Parsing has finished. */
/* Our ExampleHandler now provides the parsed data to us. */
List<ParsedExampleDataSet> parsedExampleDataSet = myExampleHandler.getParsedData();
/* Set the result to be displayed in our GUI. */
//tv.setText(parsedExampleDataSet.toString());
String currentFile;
String currentFileURL;
int x = 1;
Iterator i;
i = parsedExampleDataSet.iterator();
ParsedExampleDataSet dataItem;
while(i.hasNext()){
dataItem = (ParsedExampleDataSet) i.next();
tv.append("\nName:> " + dataItem.getName());
tv.append("\nTitle:> " + dataItem.getTitle());
tv.append("\nPages:> " + dataItem.getPages());
tv.append("\nFile:> " + dataItem.getUrl());
/*
int NumPages = Integer.parseInt(dataItem.getPages());
while( x <= NumPages ){
currentFile = dataItem.getName() + "-" + x + ".jpg";
currentFileURL = dataItem.getUrl() + currentFile;
tv.append("\nName: " + dataItem.getName());
tv.append("\nTitle: " + dataItem.getTitle());
tv.append("\nPages: " + NumPages );
tv.append("\nFile: " + currentFile);
startDownload(currentFile, currentFileURL);
x++;
}
*/
}
} catch (Exception e) {
/* Display any Error to the GUI. */
tv.setText("Error: " + e.getMessage());
}
/* Display the TextView. */
this.setContentView(tv);
}
private void startDownload(String currentFile, String currentFileURL ){
new DownloadFileAsync().execute(currentFile, currentFileURL);
}
@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case DIALOG_DOWNLOAD_PROGRESS:
mProgressDialog = new ProgressDialog(this);
mProgressDialog.setMessage("Downloading files...");
mProgressDialog.setIndeterminate(false);
mProgressDialog.setMax(100);
mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
mProgressDialog.setCancelable(true);
mProgressDialog.show();
return mProgressDialog;
default:
return null;
}
}
class DownloadFileAsync extends AsyncTask<String, String, String>{
@Override
protected void onPreExecute() {
super.onPreExecute();
showDialog(DIALOG_DOWNLOAD_PROGRESS);
}
@Override
protected String doInBackground(String... strings) {
try {
String currentFile = strings[0];
String currentFileURL = strings[1];
File root = Environment.getExternalStorageDirectory();
URL u = new URL(currentFileURL);
HttpURLConnection c = (HttpURLConnection) u.openConnection();
c.setRequestMethod("GET");
c.setDoOutput(true);
c.connect();
int lenghtOfFile = c.getContentLength();
FileOutputStream f = new FileOutputStream(new File(root + "/download/", currentFile));
InputStream in = c.getInputStream();
byte[] buffer = new byte[1024];
int len1 = 0;
long total = 0;
while ((len1 = in.read(buffer)) > 0) {
total += len1; //total = total + len1
publishProgress("" + (int)((total*100)/lenghtOfFile));
f.write(buffer, 0, len1);
}
f.close();
} catch (Exception e) {
Log.d("Downloader", e.getMessage());
}
return null;
}
protected void onProgressUpdate(String... progress) {
Log.d("ANDRO_ASYNC",progress[0]);
mProgressDialog.setProgress(Integer.parseInt(progress[0]));
}
@Override
protected void onPostExecute(String unused) {
dismissDialog(DIALOG_DOWNLOAD_PROGRESS);
}
}
}
ExampleHandler.java：
package com.example.engagiasync;
import java.util.ArrayList;
import java.util.List;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
public class ExampleHandler extends DefaultHandler{
// ===========================================================
// Fields
// ===========================================================
private StringBuilder mStringBuilder = new StringBuilder();
private ParsedExampleDataSet mParsedExampleDataSet = new ParsedExampleDataSet();
private List<ParsedExampleDataSet> mParsedDataSetList = new ArrayList<ParsedExampleDataSet>();
// ===========================================================
// Getter & Setter
// ===========================================================
public List<ParsedExampleDataSet> getParsedData() {
return this.mParsedDataSetList;
}
// ===========================================================
// Methods
// ===========================================================
/** Gets be called on opening tags like:
* <tag>
* Can provide attribute(s), when xml was like:
* <tag attribute="attributeValue">*/
@Override
public void startElement(String namespaceURI, String localName, String qName, Attributes atts) throws SAXException {
if (localName.equals("Slideshow")) {
this.mParsedExampleDataSet = new ParsedExampleDataSet();
}
}
/** Gets be called on closing tags like:
* </tag> */
@Override
public void endElement(String namespaceURI, String localName, String qName)
throws SAXException {
if (localName.equals("Slideshow")) {
this.mParsedDataSetList.add(mParsedExampleDataSet);
}else if (localName.equals("name")) {
mParsedExampleDataSet.setName(mStringBuilder.toString().trim());
}else if (localName.equals("title")) {
mParsedExampleDataSet.setTitle(mStringBuilder.toString().trim());
}else if(localName.equals("pages")) {
mParsedExampleDataSet.setPages(mStringBuilder.toString().trim());
}else if(localName.equals("url")){
mParsedExampleDataSet.setUrl(mStringBuilder.toString().trim());
}
mStringBuilder.setLength(0);
}
/** Gets be called on the following structure:
* <tag>characters</tag> */
@Override
public void characters(char ch[], int start, int length) {
mStringBuilder.append(ch, start, length);
}
}
ParsedExampleDataSet.java：
package com.example.engagiasync;
public class ParsedExampleDataSet {
private String name = null;
private String title = null;
private String pages = null;
private String url = null;
//name
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
//title
public String getTitle(){
return title;
}
public void setTitle(String title){
this.title = title;
}
//pages
public String getPages(){
return pages;
}
public void setPages(String pages){
this.pages = pages;
}
//url
public String getUrl(){
return url;
}
public void setUrl(String url){
this.url = url;
}
/*
public String toString(){
return "Firstname: " + this.firstname + "\n" + "Lastname: " + this.lastname + "\n" + "Address: " + this.Address + "\nFile URL: " + this.FileURL + "\n\n";
}
*/
}
以上代码在UI中返回以下结果：
...PARSE AND DOWNLOAD...
Name:> 27/flv
Title:> scooter
Pages:> 4
File:> http://dev2.somedomain.com/tabletcms/tablets/tablet_content/000002/videos/
我希望它是：
...PARSE AND DOWNLOAD...
Name:> 44
Title:> ProcessFlow
Pages:> 4
File:> http://dev2.somedomain.com/tabletcms/tablets/tablet_content/000002/slideshows/
答案 0 :(得分：2)
尝试使用DOM解析器而不是SAX解析器....
input=httpconnection.openHttpConnection(url);
isr = new InputStreamReader(input);
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
documentBuilder = documentBuilderFactory.newDocumentBuilder();
document = documentBuilder.parse(input, null);
document.getDocumentElement().normalize();
NodeList videosList = document.getElementsByTagName("Video");
for (int i = 0; i < videosList .getLength(); i++)
{
Node node = videosList .item(i);
Element playlistElement = (Element) node;
NodeList title = playlistElement.getElementsByTagName("name");
if (title.item(0).getChildNodes().item(0) != null)
{
Element nameElement = (Element) title.item(0);
title = nameElement.getChildNodes();
Log.v("name===>",((Node) title.item(0)).getNodeValue());
}
//Like wise use the same code for title ,url ,thumbnail...
}
答案 1 :(得分：1)
HI，
保留父标记的布尔变量
并在EndElement（）方法中检查父标记是否为真;
如果为true，则将该特定值存储到相应的变量中。
e.g。
如果你有
<ResultSet>
<result>
<name>a</name>
</result>
<customresult>
<name>avs</customresult>
</ResultSet>
取两个变量作为结果＆amp;自定义布尔类型;
最初将它们标记为false，
检查startElement（）方法是否解析是否以Result元素开始，如果是的话
然后将其标记为真实。
＆安培;现在你知道你正在解析结果，所以你可以很容易地识别
中的变量结果。
最诚挚的问候，
~Anup
答案 2 :(得分：1)
public class XMLHandler extends DefaultHandler
{
boolean result;
boolean customresult;
String temp;
@Override
public void startElement(String uri, String localName, String qName,Attributes attributes) throws SAXException
{
else if (localName.equalsIgnoreCase("result"))
{
result = true;
}
else if(localName.equalsIgnoreCase("customresult"))
{
customresult =true;
}
}
@Override
public void endElement(String uri, String localName, String qName)throws SAXException {
/** set value */
if (localName.equalsIgnoreCase("name") && result == true)
{
String name = temp; //which is nothing but your name from result tag
}
else if(localName.equalsIgnoreCase("name") && result == true)
{
String name = temp; //which is nothing but your name from customresult tag
}
else if(localName.equalsIgnoreCase("result"))
{
result = false;
}
else if(localName.equalsIgnoreCase("customresult"))
{
customresult = false;
}
}
/** Called to get tag characters ( ex:- <name>AndroidPeople</name>
* -- to get AndroidPeople Character ) */
@Override
public void characters(char[] ch, int start, int length)throws SAXException
{
temp = new String(ch, start, length);
}
}
这就是我的朋友如果你发现它很有用，那就别忘了把它标记为答案。