Java android中使用android.sax的XML解析问题
我有一个xml文件Java android中使用android.sax的XML解析问题,java,android,sax,xml-parsing,Java,Android,Sax,Xml Parsing,我有一个xml文件 <?xml version="1.0" encoding="utf-8"?> <sections> <section> <name>Most Pouplar</name> <items> <item pos="1"> <name> AcaiBerr
<?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>
//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;
}
我需要阅读所有项目（包括pos、名称和描述）和章节。我使用一个HashMap，作为我放置部分的键，作为该键的值，我放置一个与该特定键（作为部分名称）相关的所有项（带位置、名称、描述）的数组列表。这里您似乎没有使用SAX解析器，而是使用DOM traveral 如果希望使用SAX解析器解析XML，则需要初始化SAX解析器并定义ContentHandler，在其中实现解析逻辑
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()));
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
}
}
可以找到一个使用SAX解析XML文件（包含项元素）的示例。这里似乎没有使用SAX解析器，而是使用DOM traveral 如果希望使用SAX解析器解析XML，则需要初始化SAX解析器并定义ContentHandler，在其中实现解析逻辑
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()));
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
}
}
可以找到一个使用SAX解析XML文件（包含项元素）的示例。您已经走上了正轨。下一步是：
公共类AndroidSaxFeedParser扩展了BaseFeedParser{
//存储具有特定节的所有项目
ArrayList itemList=新建ArrayList（）；
//存储按节分类的所有项目
Map itemStore=newhashmap（1）；
//单项
ItemPojo currentItem=null；
//当前节名称
字符串sectionName=null；
公共AndroidSaxFeedParser（）{
超级（）；
}
公共映射解析（）{
根元素根=新根元素（节）；
元素节=root.getChild（节）；
元素itemHeader=section.getChild（ITEM_头）；
//读取标记作为节使用
itemHeader.setEndTextElementListener（新的EndTextElementListener（）{
公共无效结束（字符串体）{
sectionName=body.trim（）；
Log.i（“新章节”，“新章节发现：”+章节名称）；
}
});
section.setStartElementListener（新的StartElementListener（）{
公共void开始（属性）{
//清除项目列表
itemList=新的ArrayList（0）；
Log.i（“列表大小”，“大小：+itemList.Size（））；
}
});
section.setEndElementListener（新的EndElementListener（）{
公共无效结束（）{
//将其放入主列表中
itemStore.put（sectionName，itemList）；
}
});
元素项=section.getChild（项）；
元素项=items.getChild（item）；
items.setEndElementListener（新的EndElementListener（）{
公共无效结束（）{
//按位置对项目排序
Collections.sort（itemList、ItemPojo.COMPARE\u BY\u POSITION）；
}
});
item.setStartElementListener（新的StartElementListener（）{
公共void开始（属性）{
currentItem=新的ItemPojo（）；
currentItem.setItemPosition（Integer.parseInt（attributes.getValue（“pos”））；
//i（“测试xml”、“项初始化”+currentItem.toString（））；
}
});
item.setEndElementListener（新的EndElementListener（）{
公共无效结束（）{
itemList.add（当前项）；
i（“测试xml”，“找到新项”+currentItem.toString（））；
}
});
item.getChild（item_NAME）.setEndTextElementListener（新的EndTextElementListener（）{
公共无效结束（字符串体）{
currentItem.setItemName（body.trim（））；
}
});
item.getChild（DESCRIPTION）.setEndTextElementListener（新的EndTextElementListener（）{
公共无效结束（字符串体）{
currentItem.setItemDescription（body.trim（））；
}
});
试一试{
parse（this.getInputStream（），Xml.Encoding.UTF_8，root.getContentHandler（））；
}捕获（例外e）{
抛出新的运行时异常（e）；
}
返回项目存储；
}
}
公共抽象类BaseFeedParser实现FeedParser{
//XML标记的名称
静态最终字符串SECTIONS=“SECTIONS”；
静态最终字符串SECTION=“SECTION”；
静态最终字符串项\u HEADER=“name”；
静态最终字符串DESCRIPTION=“DESCRIPTION”；
静态最终字符串项\u NAME=“NAME”；
静态最终字符串项\u POSITION=“pos”；
静态最终字符串ITEM=“ITEM”；
静态最终字符串ITEMS=“ITEMS”；
流内公共输入流；
公共BaseFeedParser（）{
//超级（）；
}
受保护的InputStream getInputStream（）{
itemName.setEndTextElementListener(new EndTextElementListener() {
@Override
public void end(String body) {
myPojoItem.setName(body);
}
});
try {
Xml.parse(myXmlAsFileInputStream, Xml.Encoding.UTF_8, root.getContentHandler());
} catch (Exception e) {
e.printStackTrace();
}
item.setStartElementListener(new StartElementListener() {
@Override
public void start(Attributes attributes) {
position = attributes.getValue("pos");
}
});
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();
}