xml jasp sax解析
阿新 • • 發佈：2018-11-10
xml檔案：
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE 書架 [ <!ELEMENT 書架 (書+)> <!ELEMENT 書 (書名,作者,售價)> <!ELEMENT 書名 (#PCDATA)> <!ELEMENT 作者 (#PCDATA)> <!ELEMENT 售價 (#PCDATA)> ]> <書架> <書> <書名 name="xxx">鋼鐵是怎樣煉成的</書名> <作者>尼·奧斯特洛夫斯基 </作者> <售價>16.5</售價> </書> <書> <書名>假如給我三天光明</書名> <作者>海倫·凱勒 </作者> <售價>17.6</售價> </書> </書架>
一、得到xml文件中的所有類容；
package cn.sax; import java.io.IOException; import javax.xml.parsers.ParserConfigurationException; import javax.xml.parsers.SAXParser; import javax.xml.parsers.SAXParserFactory; import javax.xml.validation.Schema; import org.xml.sax.Attributes; import org.xml.sax.ContentHandler; import org.xml.sax.Locator; import org.xml.sax.SAXException; import org.xml.sax.XMLReader; //sax解析xml文件 public class Demo1 { public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException { //1.建立解析工廠 SAXParserFactory factory = SAXParserFactory.newInstance(); //2.得到解析器 SAXParser sp = factory.newSAXParser(); //3.得到讀取器 XMLReader reader = sp.getXMLReader(); //4.設定內容處理器 reader.setContentHandler(new ListHandler()); //5.讀取xml類容。 reader.parse("src/book.xml"); } } //得到xml文件中的所有類容； class ListHandler implements ContentHandler{ public void startElement(String uri, String localName, String name, Attributes atts) throws SAXException { System.out.println("<"+name+">"); for (int i=0;atts!=null && i<atts.getLength();i++){ String index = atts.getQName(i); //得到屬性名 String value = atts.getValue(i); //得到屬性值 System.out.println(index + "=" + value); } } public void characters(char[] ch, int start, int length) throws SAXException { System.out.println(new String(ch,start,length)); } public void endElement(String uri, String localName, String name) throws SAXException { System.out.println("</"+name+">"); } public void setDocumentLocator(Locator locator) { // TODO Auto-generated method stub } public void startDocument() throws SAXException { // TODO Auto-generated method stub } public void endDocument() throws SAXException { // TODO Auto-generated method stub } public void startPrefixMapping(String prefix, String uri) throws SAXException { // TODO Auto-generated method stub } public void endPrefixMapping(String prefix) throws SAXException { // TODO Auto-generated method stub } public void ignorableWhitespace(char[] ch, int start, int length) throws SAXException { // TODO Auto-generated method stub } public void processingInstruction(String target, String data) throws SAXException { // TODO Auto-generated method stub } public void skippedEntity(String name) throws SAXException { // TODO Auto-generated method stub } }
二、獲取指定標籤的值
package cn.sax; import java.io.IOException; import javax.xml.parsers.ParserConfigurationException; import javax.xml.parsers.SAXParser; import javax.xml.parsers.SAXParserFactory; import javax.xml.validation.Schema; import org.xml.sax.Attributes; import org.xml.sax.ContentHandler; import org.xml.sax.Locator; import org.xml.sax.SAXException; import org.xml.sax.XMLReader; import org.xml.sax.helpers.DefaultHandler; //sax解析xml文件 public class Demo2 { public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException { //1.建立解析工廠 SAXParserFactory factory = SAXParserFactory.newInstance(); //2.得到解析器 SAXParser sp = factory.newSAXParser(); //3.得到讀取器 XMLReader reader = sp.getXMLReader(); //4.設定內容處理器 reader.setContentHandler(new TagValueHandler()); //5.讀取xml類容。 reader.parse("src/book.xml"); } } //獲取指定標籤的值 class TagValueHandler extends DefaultHandler{ private String currenttag; //用來記住當前的標籤名 private int needNumber =2; //想獲取的第幾個作者標籤的值 private int currentNumber; //當前解析到的是第幾個 @Override public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException { currenttag = qName; if(currenttag.equalsIgnoreCase("作者")){ currentNumber++; } } @Override public void characters(char[] ch, int start, int length) throws SAXException { if("作者".equals(currenttag) && currentNumber==needNumber){ System.out.println(new String(ch,start,length)); } } @Override public void endElement(String uri, String localName, String qName) throws SAXException { currenttag=null; } }
三、Sax解析案例javabean封裝xml文件資料物件
package cn.sax;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.validation.Schema;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;
//sax解析xml文件
public class Demo3 {
public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException {
//1.建立解析工廠
SAXParserFactory factory = SAXParserFactory.newInstance();
//2.得到解析器
SAXParser sp = factory.newSAXParser();
//3.得到讀取器
XMLReader reader = sp.getXMLReader();
//4.設定內容處理器.
BeanListHandler handler = new BeanListHandler();
reader.setContentHandler(handler);
//5.讀取xml類容。
reader.parse("src/book.xml");
List<Book> list = handler.getList();
Book book=list.get(1);
System.out.println(book.getName());
System.out.println(book.getAuthor());
System.out.println(book.getPrice());
}
}
//獲取指定標籤的值
class BeanListHandler extends DefaultHandler{
private List list = new ArrayList();
private String currentTag;
private Book book;
@Override
public void startElement(String uri, String localName, String qName,
Attributes attributes) throws SAXException {
currentTag = qName;
if("書".equals(currentTag)){
book = new Book();
}
}
@Override
public void characters(char[] ch, int start, int length)
throws SAXException {
if("書名".equals(currentTag)){
String name = new String(ch,start,length);
book.setName(name);
}
if("作者".equals(currentTag)){
String author = new String(ch,start,length);
book.setAuthor(author);
}
if("售價".equals(currentTag)){
String price = new String(ch,start,length);
book.setPrice(price);
}
}
@Override
public void endElement(String uri, String localName, String qName)
throws SAXException {
if(qName.equals("書")){
list.add(book);
book = null;
}
currentTag=null;
}
public List getList() {
return list;
}
}