Android的DOM解析器 - 从描述标签检索图像链接 [英] Android DOM Parser - retrieving image link from description tag
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问题描述
我使用DOM解析器解析这个XML提要：的http：//禄.grupolusofona.pt /的index.php /？格式=供稿
I'm using DOM Parser to parse this XML feed: http://loc.grupolusofona.pt/index.php/?format=feed
我得到了解析器工作正常，所有的标签，我只是缺少想法，以便能够从描述标签内检索图像。
I got the Parser working fine for all tags, i'm just missing ideas to be able to retrieve the image from within the description tag.
在饲料中的描述标签是这样的：
The description tag on the feed looks like this:
<description><![CDATA[<div class="K2FeedIntroText"><p><img style="margin: 10px;"
alt="joana soares rostos" src="http://loc.grupolusofona.pt/images/stories/varios/joana%20soares%20rostos.jpg"
height="110" width="120" />Quis ser veterinária mas deixou-se seduzir pela magia
de retratar o real. Joana Soares frequenta o primeiro ano do curso de Fotografia
da Lusófona e descreve a sua paixão pelas fotos como «inexplicável».</p>
</div>]]></description>
和我想检索图像链接：
http://loc.grupolusofona.pt/images/stories/varios/joana%20soares%20rostos.jpg
我的解析器：
My Parser :
public class XMLParser {
// constructor
public XMLParser() {
}
/**
* Getting XML from URL making HTTP request
* @param url string
* */
public String getXmlFromUrl(String url) {
String xml = null;
try {
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
xml = EntityUtils.toString(httpEntity);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
// return XML
return xml;
}
/**
* Getting XML DOM element
* @param XML string
* */
public Document getDomElement(String xml){
Document doc = null;
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
try {
DocumentBuilder db = dbf.newDocumentBuilder();
InputSource is = new InputSource();
is.setCharacterStream(new StringReader(xml));
doc = db.parse(is);
} catch (ParserConfigurationException e) {
Log.e("Error: ", e.getMessage());
return null;
} catch (SAXException e) {
Log.e("Error: ", e.getMessage());
return null;
} catch (IOException e) {
Log.e("Error: ", e.getMessage());
return null;
}
return doc;
}
/** Getting node value
* @param elem element
*/
public final String getElementValue( Node elem ) {
if( elem != null){
return elem.getTextContent();
}
return "";
}
/**
* Getting node value
* @param Element node
* @param key string
* */
public String getValue(Element item, String str) {
NodeList n = item.getElementsByTagName(str);
return this.getElementValue(n.item(0));
}
}
和我的主要活动：
public class Noticias extends ListActivity {
// All static variables
static final String URL = "http://loc.grupolusofona.pt/index.php/?format=feed";
// XML node keys
static final String KEY_ITEM = "item"; // parent node
static final String KEY_ID = "id";
static final String KEY_TITLE = "title";
static final String KEY_DESC = "description";
static final String KEY_LINK = "link";
static final String KEY_PUBDATE = "pubDate";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_noticias);
ArrayList<HashMap<String, Spanned>> menuItems = new ArrayList<HashMap<String, Spanned>>();
XMLParser parser = new XMLParser();
String xml = parser.getXmlFromUrl(URL); // getting XML
Document doc = parser.getDomElement(xml); // getting DOM element
NodeList nl = doc.getElementsByTagName(KEY_ITEM);
// looping through all item nodes <item>
for (int i = 0; i < nl.getLength(); i++) {
// creating new HashMap
HashMap<String, Spanned> map = new HashMap<String, Spanned>();
Element e = (Element) nl.item(i);
// adding each child node to HashMap key => value
map.put(KEY_ID, Html.fromHtml(parser.getValue(e, KEY_ID)));
map.put(KEY_TITLE, Html.fromHtml(parser.getValue(e, KEY_TITLE)));
map.put(KEY_DESC, Html.fromHtml(parser.getValue(e, KEY_DESC)));
map.put(KEY_PUBDATE, Html.fromHtml(parser.getValue(e, KEY_PUBDATE)));
map.put(KEY_LINK, Html.fromHtml(parser.getValue(e, KEY_LINK)));
// adding HashList to ArrayList
menuItems.add(map);
}
// Adding menuItems to ListView
ListAdapter adapter = new SimpleAdapter(this, menuItems,
R.layout.linha_feed,
new String[] { KEY_TITLE, KEY_DESC, KEY_PUBDATE, KEY_LINK }, new int[] {
R.id.title, R.id.desc, R.id.pub, R.id.link});
setListAdapter(adapter);
// selecting single ListView item
ListView lv = getListView();
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// getting values from selected ListItem
String title = ((TextView) view.findViewById(R.id.title)).getText().toString();
String description = ((TextView) view.findViewById(R.id.desc)).getText().toString();
String pub = ((TextView) view.findViewById(R.id.pub)).getText().toString();
String link = ((TextView) view.findViewById(R.id.link)).getText().toString();
// Starting new intent
System.out.println("Title: " + title);
System.out.println("Link: " + link);
System.out.println("Description:" + description);
System.out.println("Pubdate: " + pub);
Intent in = new Intent(Intent.ACTION_VIEW);
in.setData(Uri.parse(link));
startActivity(in);
}
});
}
}
任何想法？
感谢您的时间。
推荐答案
使用正则表达式用一个简单的模式是这样的：
Use RegEx with a simple pattern like this:
<\s*img\s*[^>]+src\s*=\s*(['"]?)(.*?)\1
下面使用这些功能：
public static String getMatch(String patternString, String text, int groupIndex){
Pattern pattern = Pattern.compile(patternString, Pattern.CASE_INSENSITIVE | Pattern.DOTALL );
return RegEx.getMatch(pattern, text, groupIndex);
}
public static String getMatch(Pattern pattern, String text, int groupIndex){
if(text!=null){
Matcher matcher = pattern.matcher(text);
String match = null;
while(matcher.find()){
match = matcher.group(groupIndex);
break;
}
return match;
}else{
return null;
}
}
然后就可以在这样的模式插件：
Then you can plug in that pattern like this:
String imageSource = getMatch("<\\s*img\\s*[^>]+src\\s*=\\s*(['\"]?)(.*?)\\1", description, 2);
这篇关于Android的DOM解析器 - 从描述标签检索图像链接的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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