天津建筑网站建设,甘肃兰州海拔多少米,网站后台模板,wordpress充值中心SAX解析器使用回调函数#xff08;org.xml.sax.helpers.DefaultHandler#xff09;通知客户端XML文档结构。 您应该扩展DefaultHandler并重写一些方法来实现xml解析。 覆盖的方法是 startDocument#xff08;#xff09;和endDocument#xff08;#xff09;–在XML文档… SAX解析器使用回调函数org.xml.sax.helpers.DefaultHandler通知客户端XML文档结构。 您应该扩展DefaultHandler并重写一些方法来实现xml解析。 覆盖的方法是 startDocument和endDocument–在XML文档的开头和结尾处调用的方法。 startElement和endElement–在文档元素的开头和结尾处调用的方法。 character–以XML文档元素的开始和结束标记之间的文本内容调用的方法。 下面的示例演示使用DefaultHandler解析和XML文档。 它执行xml到模型类的映射并生成对象列表。 XML文档样本 ?xml version1.0 encodingUTF-8?
catalogbook id001 langENGisbn23-34-42-3/isbnregDate1990-05-24/regDatetitleOperating Systems/titlepublisher countryUSAPearson/publisherprice400/priceauthorsauthorGanesh Tiwari/author/authors/bookbook id002isbn24-300-042-3/isbnregDate1995-05-12/regDatetitleDistributed Systems/titlepublisher countryNepalEkata/publisherprice500/priceauthorsauthorMahesh Poudel/authorauthorBikram Adhikari/authorauthorRamesh Poudel/author/authors/book
/catalog Book对象的模型类用于将xml映射到对象 /*** Book class stores book information, after parsing the xml* author Ganesh Tiwari*/
public class Book {String lang;String title;String id;String isbn;Date regDate;String publisher;int price;ListString authors;public Book(){authorsnew ArrayListString();}//getters and setters
} XML解析Sax的Java代码 import java.io.IOException;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
public class MySaxParser extends DefaultHandler {ListBook bookL;String bookXmlFileName;String tmpValue;Book bookTmp;SimpleDateFormat sdf new SimpleDateFormat(yy-MM-dd);public MySaxParser(String bookXmlFileName) {this.bookXmlFileName bookXmlFileName;bookL new ArrayListBook();parseDocument();printDatas();}private void parseDocument() {// parseSAXParserFactory factory SAXParserFactory.newInstance();try {SAXParser parser factory.newSAXParser();parser.parse(bookXmlFileName, this);} catch (ParserConfigurationException e) {System.out.println(ParserConfig error);} catch (SAXException e) {System.out.println(SAXException : xml not well formed);} catch (IOException e) {System.out.println(IO error);}}private void printDatas() {// System.out.println(bookL.size());for (Book tmpB : bookL) {System.out.println(tmpB.toString());}}Overridepublic void startElement(String s, String s1, String elementName, Attributes attributes) throws SAXException {// if current element is book , create new book// clear tmpValue on start of elementif (elementName.equalsIgnoreCase(book)) {bookTmp new Book();bookTmp.setId(attributes.getValue(id));bookTmp.setLang(attributes.getValue(lang));}// if current element is publisherif (elementName.equalsIgnoreCase(publisher)) {bookTmp.setPublisher(attributes.getValue(country));}}Overridepublic void endElement(String s, String s1, String element) throws SAXException {// if end of book element add to listif (element.equals(book)) {bookL.add(bookTmp);}if (element.equalsIgnoreCase(isbn)) {bookTmp.setIsbn(tmpValue);}if (element.equalsIgnoreCase(title)) {bookTmp.setTitle(tmpValue);}if(element.equalsIgnoreCase(author)){bookTmp.getAuthors().add(tmpValue);}if(element.equalsIgnoreCase(price)){bookTmp.setPrice(Integer.parseInt(tmpValue));}if(element.equalsIgnoreCase(regDate)){try {bookTmp.setRegDate(sdf.parse(tmpValue));} catch (ParseException e) {System.out.println(date parsing error);}}}Overridepublic void characters(char[] ac, int i, int j) throws SAXException {tmpValue new String(ac, i, j);}public static void main(String[] args) {new MySaxParser(catalog.xml);}
} 解析输出 Book [langENG, titleOperating Systems, id001, isbn23-34-42-3, regDateThu May 24 00:00:00 NPT 1990, publisherUSA, price400, authors[Ganesh Tiwari]]
Book [langnull, titleDistributed Systems, id002, isbn24-300-042-3, regDateFri May 12 00:00:00 NPT 1995, publisherNepal, price500, authors[Mahesh Poudel, Bikram Adhikari, Ramesh Poudel]] 参考在GTs Blog上 使用我们的JCG合作伙伴 Ganesh Tiwari 提供的完整代码 使用SaxParser进行XML解析 。 翻译自: https://www.javacodegeeks.com/2012/01/xml-parsing-using-saxparser-with.html
