一、book.xml:
<?xml version="1.0" encoding="UTF-8"?> <bookstore> <book id="1"> <name>冰与火之歌</name> <author>乔治马丁</author> <year>2014</year> <price>89</price> </book> <book id="2"> <name>安徒生童话</name> <year>2004</year> <price>77</price> <language>English</language> </book> </bookstore>
二、hnadler类:
import java.util.ArrayList; import org.xml.sax.Attributes; import org.xml.sax.SAXException; import org.xml.sax.helpers.DefaultHandler; import com.imooc.entity.Book; public class SAXParserHandler extends DefaultHandler { String value = null; Book book = null; private ArrayList<Book> bookList = new ArrayList<Book>(); public ArrayList<Book> getBookList() { return bookList; } int bookIndex = 0; /** * 用来标识解析开始 */ @Override public void startDocument() throws SAXException { // TODO Auto-generated method stub super.startDocument(); System.out.println("SAX解析开始"); } /** * 用来标识解析结束 */ @Override public void endDocument() throws SAXException { // TODO Auto-generated method stub super.endDocument(); System.out.println("SAX解析结束"); } /** * 解析xml元素 */ @Override public void startElement(String uri,String localName,String qName,Attributes attributes) throws SAXException { //调用DefaultHandler类的startElement方法 super.startElement(uri,localName,qName,attributes); if (qName.equals("book")) { bookIndex++; //创建一个book对象 book = new Book(); //开始解析book元素的属性 System.out.println("======================开始遍历某一本书的内容================="); // //已知book元素下属性的名称,根据属性名称获取属性值 // String value = attributes.getValue("id"); // System.out.println("book的属性值是:" + value); //不知道book元素下属性的名称以及个数,如何获取属性名以及属性值 int num = attributes.getLength(); for(int i = 0; i < num; i++){ System.out.print("book元素的第" + (i + 1) + "个属性名是:" + attributes.getQName(i)); System.out.println("---属性值是:" + attributes.getValue(i)); if (attributes.getQName(i).equals("id")) { book.setId(attributes.getValue(i)); } } } else if (!qName.equals("name") && !qName.equals("bookstore")) { System.out.print("节点名是:" + qName + "---"); } } @Override public void endElement(String uri,String qName) throws SAXException { //调用DefaultHandler类的endElement方法 super.endElement(uri,qName); //判断是否针对一本书已经遍历结束 if (qName.equals("book")) { bookList.add(book); book = null; System.out.println("======================结束遍历某一本书的内容================="); } else if (qName.equals("name")) { book.setName(value); } else if (qName.equals("author")) { book.setAuthor(value); } else if (qName.equals("year")) { book.setYear(value); } else if (qName.equals("price")) { book.setPrice(value); } else if (qName.equals("language")) { book.setLanguage(value); } } @Override public void characters(char[] ch,int start,int length) throws SAXException { // TODO Auto-generated method stub super.characters(ch,start,length); value = new String(ch,length); if (!value.trim().equals("")) { System.out.println("节点值是:" + value); } } }
三、测试类:
import java.io.IOException; import javax.xml.parsers.ParserConfigurationException; import javax.xml.parsers.SAXParser; import javax.xml.parsers.SAXParserFactory; import org.xml.sax.SAXException; import org.xml.sax.SAXParseException; import com.imooc.entity.Book; import com.imooc.handler.SAXParserHandler; public class SAXTest { public static void main(String[] args) { //获取一个SAXParserFactory的实例 <span style="white-space:pre"> </span>SAXParserFactory factory = SAXParserFactory.newInstance(); <span style="white-space:pre"> </span>//通过factory获取SAXParser实例 <span style="white-space:pre"> </span>try { <span style="white-space:pre"> </span>SAXParser parser = factory.newSAXParser(); <span style="white-space:pre"> </span>//创建SAXParserHandler对象 SAXParserHandler handler = new SAXParserHandler(); parser.parse("books.xml",handler); System.out.println("~!~!~!共有" + handler.getBookList().size() + "本书"); for (Book book : handler.getBookList()) { System.out.println(book.getId()); System.out.println(book.getName()); System.out.println(book.getAuthor()); System.out.println(book.getYear()); System.out.println(book.getPrice()); System.out.println(book.getLanguage()); System.out.println("----finish----"); } } 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(); } } }