我在 android 中使用 SAX 解析。对于以下 XML:
<?xml version="1.0" encoding="utf-8"?>
<rss version="2.0">
<channel>
<title>Game Analysis</title>
<item>
<title>GTA</title>
<description>ABC</description>
<pubDate>Sat, 21 Feb 2012 05:18:23 GMT</pubDate>
<enclosure type="audio/mpeg" url="http://URL.mp3" length="6670315"/>
</item>
<item>
<title>CoD</title>
<description>XYZ</description>
<pubDate>Sat, 21 Feb 2011 05:18:23 GMT</pubDate>
<enclosure type="audio/mpeg" url="http://URL.mp3" length="6670315"/>
</item>
</channel>
</rss>
我需要获取第一次出现的 <title> (就在下面)。
然后我需要再次从每个 block 中提取 <title> & <enclosure> .
我可以获取第一个 <title>使用:
public void startElement(String uri, String localName, String qName,
属性属性)抛出 SAXException {
如果(qName.equals(“标题”))
...
但是，我应该如何获取 <item> block 中的标签？ ？
最佳答案
下面是我如何使用 SAX 实现的。
我已经修改了一口你的 XML 文件。
XML 文件
<?xml version="1.0" encoding="utf-8"?>
<rss version="2.0">
<channel>
<title>Game Analysis</title>
<item>
<title>GTA</title>
<description>ABC</description>
<pubDate>Sat, 21 Feb 2012 05:18:23 GMT</pubDate>
<enclosure type="audio/mpeg" url="http://URL.mp3/1" length="6670315"/>
</item>
<item>
<title>CoD</title>
<description>XYZ</description>
<pubDate>Sat, 21 Feb 2011 05:45:10 GMT</pubDate>
<enclosure type="audio/mpeg" url="http://URL.mp3/2" length="6670345"/>
</item>
<item>
<title>AtV</title>
<description>fgh</description>
<pubDate>Sat, 21 Feb 2011 06:20:10 GMT</pubDate>
<enclosure type="audio/mpeg" url="http://URL.mp3/3" length="6670364"/>
</item>
</channel>
<channel>
<title>Game Analysis 2</title>
<item>
<title>GTA 2</title>
<description>ABC 2</description>
<pubDate>Sat, 21 Feb 2012 04:18:23 GMT</pubDate>
<enclosure type="audio/mpeg" url="http://URL.mp3/2/1" length="6670315"/>
</item>
<item>
<title>CoD 2</title>
<description>XYZ 2</description>
<pubDate>Sat, 21 Feb 2011 04:45:10 GMT</pubDate>
<enclosure type="audio/mpeg" url="http://URL.mp3/2/2" length="6670345"/>
</item>
<item>
<title>AtV 2</title>
<description>fgh</description>
<pubDate>Sat, 21 Feb 2011 05:20:10 GMT</pubDate>
<enclosure type="audio/mpeg" url="http://URL.mp3/2/3" length="6670364"/>
</item>
</channel>
</rss>
实体
channel
public class Channel {
private String title;
private ArrayList<Item> alItems;
public Channel(){}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public ArrayList<Item> getAlItems() {
return alItems;
}
public void setAlItems(ArrayList<Item> alItems) {
this.alItems = alItems;
}
}
外壳
public class Enclosure {
private String type;
private URL url;
private Integer length;
public Enclosure(){}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public URL getUrl() {
return url;
}
public void setUrl(URL url) {
this.url = url;
}
public Integer getLength() {
return length;
}
public void setLength(Integer length) {
this.length = length;
}
}
项目
public class Item {
private String title;
private String description;
private String pubDate;
private Enclosure enclosure;
public Item(){}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getPubDate() {
return pubDate;
}
public void setPubDate(String pubDate) {
this.pubDate = pubDate;
}
public Enclosure getEnclosure() {
return enclosure;
}
public void setEnclosure(Enclosure enclosure) {
this.enclosure = enclosure;
}
}
处理程序
channel 处理器
public class ChannelHandler extends DefaultHandler{
private ArrayList<Channel> alChannels;
private Channel channel;
private String reading;
private ArrayList<Item> alItems;
private Item item;
private Enclosure enclosure;
public ChannelHandler(){
super();
}
@Override
public void startElement(String uri, String localName, String qName,
Attributes attributes) throws SAXException {
if(qName.equals("rss")){
alChannels = new ArrayList<>();
}
else if(qName.equals("channel")){
channel = new Channel();
}
else if(qName.equals("item")){
item = new Item();
}
else if(qName.equals("enclosure")){
enclosure = new Enclosure();
enclosure.setType(attributes.getValue("type"));
try {
enclosure.setUrl(new URL(attributes.getValue("url")));
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
enclosure.setLength(Integer.parseInt(attributes.getValue("length")));
}
}
@Override
public void endElement(String uri, String localName, String qName)
throws SAXException {
if(qName.equals("channel")){
channel.setAlItems(alItems);
alChannels.add(channel);
alItems = null;
}
if(qName.equals("title")){
if(alItems == null){
channel.setTitle(reading);
alItems = new ArrayList<>();
}
else if(item != null) {
item.setTitle(reading);
}
}
else if(qName.equals("item")){
if(alItems != null){
alItems.add(item);
item = null;
}
}
else if(qName.equals("description")){
item.setDescription(reading);
}
else if(qName.equals("pubDate")){
item.setPubDate(reading);
}
else if(qName.equals("enclosure")){
item.setEnclosure(enclosure);
}
}
@Override
public void characters(char[] ch, int start, int length)
throws SAXException {
reading = new String(ch, start, length);
}
public ArrayList<Channel> getAlChannels() {
return alChannels;
}
}
经理
XMLManager
public final class XMLManager {
public static ArrayList<Channel> getAlChannels(){
ArrayList<Channel> alChannels = null;
SAXParserFactory factory = SAXParserFactory.newInstance();
try {
SAXParser parser = factory.newSAXParser();
File file = new File("D:\\Loic_Workspace\\TestSAX2\\res\\test.xml");
ChannelHandler channelHandler = new ChannelHandler();
parser.parse(file, channelHandler);
alChannels = channelHandler.getAlChannels();
} catch (ParserConfigurationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SAXException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return alChannels;
}
}
主体
MyMain
public class MyMain {
/**
* @param args
*/
public static void main(String[] args) {
Enclosure enclosure = null;
for(Channel channel : XMLManager.getAlChannels()){
System.out.println("Channel title : "+channel.getTitle());
System.out.println("------------------------");
for(Item i:channel.getAlItems()){
System.out.println(i.getTitle());
System.out.println(i.getPubDate());
System.out.println("Enclosure : ");
enclosure = i.getEnclosure();
System.out.println(enclosure.getType());
System.out.println(enclosure.getUrl());
System.out.println(enclosure.getLength());
System.out.println("------------------------");
}
}
}
}
控制台输出
Channel title : Game Analysis
------------------------
GTA
Sat, 21 Feb 2012 05:18:23 GMT
Enclosure :
audio/mpeg
http://URL.mp3/1
6670315
------------------------
CoD
Sat, 21 Feb 2011 05:45:10 GMT
Enclosure :
audio/mpeg
http://URL.mp3/2
6670345
------------------------
AtV
Sat, 21 Feb 2011 06:20:10 GMT
Enclosure :
audio/mpeg
http://URL.mp3/3
6670364
------------------------
Channel title : Game Analysis 2
------------------------
GTA 2
Sat, 21 Feb 2012 04:18:23 GMT
Enclosure :
audio/mpeg
http://URL.mp3/2/1
6670315
------------------------
CoD 2
Sat, 21 Feb 2011 04:45:10 GMT
Enclosure :
audio/mpeg
http://URL.mp3/2/2
6670345
------------------------
AtV 2
Sat, 21 Feb 2011 05:20:10 GMT
Enclosure :
audio/mpeg
http://URL.mp3/2/3
6670364
------------------------
所以它有效;)
关于java - SAX 解析 : how to fetch child nodes，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/14236767/