[英]XML parsing problem in android using android.sax
我有一個 xml 文件作為
<?xml version="1.0" encoding="utf-8"?>
<sections>
<section>
<name>Most Pouplar</name>
<items>
<item pos="1">
<name>
AcaiBerry Diet
</name>
<description>
<![CDATA[
Natrol AcaiBerry Diet supports weight loss goals when combined with a healthy reduced-calorie diet and exercise program. Acai is a wild fruit harvested in the rain forests of Brazil recognized for its high ORAC (oxygen-radical absorbance capacity) value - a measure of its antioxidant capacity. An adequate intake of antioxidants helps neutralize harmful free radicals that are produced by the body as a result of regular exercise.
]]>
</description>
</item>
<item pos="2">
<name>
AcaiBerry Weekend Cleanse
</name>
<description>
<![CDATA[
AcaiBerry Weekend Cleanse is a 3-step, easy-to-use cleansing program. Step 1 helps minimize occasional constipation/bloating, step 2 helps reduce toxins via antioxidant protection & cell regeneration and step 3 helps to restore the friendly bacteria that protect & strengthen the GI tract.
]]>
</description>
</item>
<item pos="4">
<name>
Carb Intercept Phase 2 + Chromium
</name>
<description>
<![CDATA[
Natrol Carb Intercept supports a low-carb lifestyle by controlling carbohydrates found in breads, cereals, rice, pasta and other starch-containing foods. Each serving provides 1,000mg of Phase 2 Carb Controller; a clinically tested ingredient that inhibits the enzyme responsible for digesting starch into simple sugars your body can absorb.
]]>
</description>
</item>
<item pos="3">
<name>
Resveratrol Diet
</name>
<description>
<![CDATA[
Losing weight has never been so rejuvenating! Natrol introduces Resveratrol Diet, a complex blend of antioxidants, enzymes and other nutrientsto help boost your metabolism and promote calorie burning.
]]>
</description>
</item>
</items>
</section>
<section>
<name>Least Popular</name>
<items>
<item pos="1">
<name>
Advanced Sleep Melatonin 10mg Maximum Strength
</name>
<description>
<![CDATA[
Getting a good night's sleep is even easier with Natrol Melatonin - a natural nightcap. A hormone found in the body, melatonin, helps promote more restful sleep. Natrol Melatonin provides relief for occasional sleeplessness, and helps promote a more relaxing night and better overall health.
]]>
</description>
</item>
<item pos="2">
<name>
Sleep 'N Restore
</name>
<description>
<![CDATA[
If you need to feel more rested due to lack of sleep, try Natrol Sleep 'N Restore. Sleep 'N Restore helps promote a more restful, deeper sleep, while supporting your body's natural restoration processes.* A combination of melatonin and valerian, this natural sleep aide includes antioxidants that can help your body protect its cells from damage to help you restore and recharge while you sleep.
]]>
</description>
</item>
</items>
</section>
</sections>
我將 POJO 定義為
public class ItemPojo {
//Fields of an item
private String itemName;
private String itemDescription;
private int itemPosition;
//Getters and Setters
public String getItemName() {
return itemName;
}
public void setItemName(String itemName) {
this.itemName = itemName;
}
public String getItemDescription() {
return itemDescription;
}
public void setItemDescription(String itemDescription) {
this.itemDescription = itemDescription;
}
public int getItemPosition() {
return itemPosition;
}
public void setItemPosition(int itemPosition) {
this.itemPosition = itemPosition;
}
}
我正在實現一種解析 xml 文件的方法,但我不知道如何讀取多個<item>
標記,它們位於<items>
標記中。
已編輯
我正在輸入部分代碼,我正在嘗試
//Store all items with a particular section
ArrayList<ItemPojo> itemList = new ArrayList<ItemPojo>();
//Store all items categorized by section
Map<String, ArrayList<ItemPojo>> itemStore = new HashMap<String, ArrayList<ItemPojo>>(1);
//Single item
ItemPojo currentItem = null;
//Current section name
String sectionName = null;
public AndroidSaxFeedParser() {
super();
}
public void parse() { //Map<String, ArrayList<ItemPojo>>
RootElement root = new RootElement(SECTIONS);
Element section = root.getChild(SECTION);
Element itemHeader = section.getChild(ITEM_HEADER);
//Read <name> tag as used as section
itemHeader.setEndTextElementListener(new EndTextElementListener() {
public void end(String body) {
sectionName = body;
}
});
//TODO set item header here
Element items = section.getChild(ITEMS);
Element item = items.getChild(ITEM);
/*//Put all items of same category
items.setEndTextElementListener(new EndTextElementListener() {
public void end(String body) {
//sort item with position
Collections.sort(itemList, ItemPojo.COMPARE_BY_POSITION);
//Putting it into master list
itemStore.put(sectionName, itemList);
//And clear the item list
itemList.clear();
}
});*/
item.setStartElementListener(new StartElementListener() {
public void start(Attributes attributes) {
currentItem = new ItemPojo();
Log.i("Test xml", "item initalised " + currentItem.toString());
}
});
item.setEndTextElementListener(new EndTextElementListener() {
public void end(String body) {
// TODO Auto-generated method stub
itemList.add(currentItem);
Log.i("Test xml", "New items found " + currentItem.toString());
}
});
item.getChild(ITEM_NAME).setEndTextElementListener(new EndTextElementListener() {
public void end(String body) {
currentItem.setItemName(body);
}
});
item.getChild(DESCRIPTION).setEndTextElementListener(new EndTextElementListener() {
public void end(String body) {
currentItem.setItemDescription(body);
}
});
try {
Xml.parse(this.getInputStream(), Xml.Encoding.UTF_8, root.getContentHandler());
} catch (Exception e) {
throw new RuntimeException(e);
}
//return itemStore;
}
現在我得到了例外
06-30 12:40:45.312: ERROR/AndroidRuntime(315): Uncaught handler: thread main exiting due to uncaught exception
06-30 12:40:45.342: ERROR/AndroidRuntime(315): java.lang.IllegalStateException: This element already has an end text element listener. It cannot have children.
06-30 12:40:45.342: ERROR/AndroidRuntime(315): at android.sax.Element.getChild(Element.java:68)
06-30 12:40:45.342: ERROR/AndroidRuntime(315): at android.sax.Element.getChild(Element.java:60)
06-30 12:40:45.342: ERROR/AndroidRuntime(315): at org.us.ssg.AndroidSaxFeedParser.parse(AndroidSaxFeedParser.java:82)
06-30 12:40:45.342: ERROR/AndroidRuntime(315): at org.us.ssg.DesTestDemoActivity.checkXml(DesTestDemoActivity.java:109)
06-30 12:40:45.342: ERROR/AndroidRuntime(315): at org.us.ssg.DesTestDemoActivity.onClick(DesTestDemoActivity.java:81)
06-30 12:40:45.342: ERROR/AndroidRuntime(315): at android.view.View.performClick(View.java:2364)
06-30 12:40:45.342: ERROR/AndroidRuntime(315): at android.view.View.onTouchEvent(View.java:4179)
06-30 12:40:45.342: ERROR/AndroidRuntime(315): at android.widget.TextView.onTouchEvent(TextView.java:6541)
我需要的
我需要閱讀所有項目(包括位置、名稱和描述)和部分。 我正在使用 HashMap 作為鍵,我正在放置部分,作為該鍵的值,我正在放置與該特定鍵(作為部分名稱)相關的所有項目(帶有位置、名稱、描述)的 ArrayList。
你一路走好。 下一步是:
為您的項目元素定義一個 startElementListener。 像這樣:
item.setStartElementListener(new StartElementListener() { @Override public void start(Attributes attributes) { myPojoItem = new PojoItem(); } });
為您的項目元素定義一個 endElementListener:像這樣:
item.setEndElementListener(new EndElementListener() { @Override public void end() { itemList.add(myPojoItem); } });
對於 item 的每個子項,請執行以下操作:
itemName.setEndTextElementListener(new EndTextElementListener() { @Override public void end(String body) { myPojoItem.setName(body); } });
完成:
嘗試 { Xml.parse(myXmlAsFileInputStream, Xml.Encoding.UTF_8, root.getContentHandler()); } 捕捉(異常 e){ e.printStackTrace(); }
更新:響應 OP 的評論,這里是如何訪問元素的屬性:
item.setStartElementListener(new StartElementListener() {
@Override
public void start(Attributes attributes) {
position = attributes.getValue("pos");
}
});
最終解決方案
來自 OP:我已經用這些方式完成了
AndroidSaxFeedParser.java
.
public class AndroidSaxFeedParser extends BaseFeedParser {
//Store all items with a particular section
ArrayList<ItemPojo> itemList = new ArrayList<ItemPojo>();
//Store all items categorized by section
Map<String, ArrayList<ItemPojo>> itemStore = new HashMap<String, ArrayList<ItemPojo>>(1);
//Single item
ItemPojo currentItem = null;
//Current section name
String sectionName = null;
public AndroidSaxFeedParser() {
super();
}
public Map<String, ArrayList<ItemPojo>> parse() {
RootElement root = new RootElement(SECTIONS);
Element section = root.getChild(SECTION);
Element itemHeader = section.getChild(ITEM_HEADER);
//Read <name> tag as used as section
itemHeader.setEndTextElementListener(new EndTextElementListener() {
public void end(String body) {
sectionName = body.trim();
Log.i("New Section", "New section found : " + sectionName);
}
});
section.setStartElementListener(new StartElementListener() {
public void start(Attributes attributes) {
//Clear the item list
itemList = new ArrayList<ItemPojo>(0);
Log.i("Size of list", "Size : " +itemList.size());
}
});
section.setEndElementListener(new EndElementListener() {
public void end() {
//Putting it into master list
itemStore.put(sectionName, itemList);
}
});
Element items = section.getChild(ITEMS);
Element item = items.getChild(ITEM);
items.setEndElementListener(new EndElementListener() {
public void end() {
//sort item with position
Collections.sort(itemList, ItemPojo.COMPARE_BY_POSITION);
}
});
item.setStartElementListener(new StartElementListener() {
public void start(Attributes attributes) {
currentItem = new ItemPojo();
currentItem.setItemPosition(Integer.parseInt(attributes.getValue("pos")));
//Log.i("Test xml", "item initalised " + currentItem.toString());
}
});
item.setEndElementListener(new EndElementListener() {
public void end() {
itemList.add(currentItem);
Log.i("Test xml", "New items found " + currentItem.toString());
}
});
item.getChild(ITEM_NAME).setEndTextElementListener(new EndTextElementListener() {
public void end(String body) {
currentItem.setItemName(body.trim());
}
});
item.getChild(DESCRIPTION).setEndTextElementListener(new EndTextElementListener() {
public void end(String body) {
currentItem.setItemDescription(body.trim());
}
});
try {
Xml.parse(this.getInputStream(), Xml.Encoding.UTF_8, root.getContentHandler());
} catch (Exception e) {
throw new RuntimeException(e);
}
return itemStore;
}
}
.
public abstract class BaseFeedParser implements FeedParser {
// names of the XML tags
static final String SECTIONS = "sections";
static final String SECTION = "section";
static final String ITEM_HEADER = "name";
static final String DESCRIPTION = "description";
static final String ITEM_NAME = "name";
static final String ITEM_POSITION = "pos";
static final String ITEM = "item";
static final String ITEMS = "items";
public InputStream inStream;
public BaseFeedParser() {
//super();
}
protected InputStream getInputStream() {
//Create a new HttpClient and Post Header
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(DesTestDemoActivity.INDEX_URL);
HttpResponse response = null;
try {
// Add your data
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("request_for", "xml_data"));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
// Execute HTTP Post Request
response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
if (entity != null)
inStream = entity.getContent();
return inStream;
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}
.
public interface FeedParser {
Map<String, ArrayList<ItemPojo>> parse();
}
在你們的幫助下,我已經完成了。 所以謝謝大家。
您似乎沒有在這里使用 SAX 解析器,而是在進行 DOM 遍歷。
如果你想用 SAX 解析器解析 XML,你需要初始化一個 SAXParser 並定義一個 ContentHandler 來實現你的解析邏輯。
SAXParserFactory spf = SAXParserFactory.newInstance();
SAXParser sp = spf.newSAXParser();
XMLReader xr = sp.getXMLReader();
/** Send URL to parse XML Tags */
URL sourceUrl = new URL(xmlFile);
/** Create handler to handle XML Tags ( extends DefaultHandler ) */
MyXMLHandler myXMLHandler = new MyXMLHandler();
xr.setContentHandler(myXMLHandler);
xr.parse(new InputSource(sourceUrl.openStream()));
當解析器到達開始和結束元素時,ContentHandler 具有回調。 在那里,您可以放置填充 POJO 所需的邏輯。
在您的特定情況下,您需要檢查項目標簽並開始填寫您的 POJO。
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
public class MyXMLHandler extends DefaultHandler {
@Override
public void startElement(String uri, String localName, String qName,
Attributes attributes) throws SAXException {
if (localName.equals("sometag")) {
// process tag
}
}
@Override
public void endElement(String uri, String localName, String qName)
throws SAXException {
// handle end element
}
}
web 上有幾篇文章,其中包含完整的代碼示例。 只需谷歌搜索 Android 和 SAX 解析器。
可以在 此處找到使用 SAX 解析 XML 文件(包含項目元素)的一個示例。
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