应用 SAX 方式解析 XML

分为三部分：@H_404_4@

@H_404_4@

1、@H_404_4@

package com;

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 com.ii.SAXParserHandler;
import com.jj.Book;

public class SAXTest {

@H_404_4@public static void main(String[] args) {
@H_404_4@// TODO Auto-generated method stub
@H_404_4@
@H_404_4@//获取一个SAXParseFactory的实例
@H_404_4@SAXParserFactory factory = SAXParserFactory.newInstance();
@H_404_4@
@H_404_4@//通过factory获取SAXParser
@H_404_4@try {
@H_404_4@SAXParser parser = factory.newSAXParser();
@H_404_4@
@H_404_4@//创建factory获取SAXParser实例
@H_404_4@SAXParserHandler handler = new SAXParserHandler();
@H_404_4@parser.parse("books.xml",handler);
@H_404_4@System.out.println("~~~~! 共有: " + handler.getBookList().size() + "本书");
@H_404_4@for (Book book : handler.getBookList()) {
@H_404_4@System.out.println(book.getId());
@H_404_4@System.out.println(book.getName());
@H_404_4@System.out.println(book.getAuthor());
@H_404_4@System.out.println(book.getYear());
@H_404_4@System.out.println(book.getPrice());
@H_404_4@System.out.println(book.getLanguage());
@H_404_4@System.out.println("-----------finish---------");
@H_404_4@
@H_404_4@}
@H_404_4@} catch (ParserConfigurationException | SAXException e) {
@H_404_4@// TODO Auto-generated catch block
@H_404_4@e.printStackTrace();
@H_404_4@
@H_404_4@} catch (IOException e) {
@H_404_4@// TODO Auto-generated catch block
@H_404_4@e.printStackTrace();
@H_404_4@}

@H_404_4@}

}
@H_404_4@

@H_404_4@

2、@H_404_4@

package com.ii;

import java.util.ArrayList;

import javax.xml.stream.events.StartElement;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

import com.jj.Book;

public class SAXParserHandler extends DefaultHandler {
@H_404_4@String value = null;
@H_404_4@Book book = null;
@H_404_4@private ArrayList<Book> bookList = new ArrayList<Book>();
@H_404_4@
@H_404_4@public ArrayList<Book> getBookList() {
@H_404_4@return bookList;
@H_404_4@}

@H_404_4@int bookIndex = 0;
@H_404_4@/*
@H_404_4@* 用来遍历XML文件的开始标签
@H_404_4@* 用来解析xml元素的
@H_404_4@* */
@H_404_4@@Override
@H_404_4@public void startElement(String uri,String localName,String qName,
@H_404_4@Attributes attributes) throws SAXException {
@H_404_4@// TODO Auto-generated method stub
@H_404_4@
@H_404_4@//调用DefaultHandler类的startElement()方法;
@H_404_4@super.startElement(uri,localName,qName,attributes);
@H_404_4@//开始解析book元素的属性
@H_404_4@
@H_404_4@if(qName.equals("book")){
@H_404_4@//创建一个book对象
@H_404_4@book = new Book();
@H_404_4@
@H_404_4@
@H_404_4@bookIndex++;
@H_404_4@//已知book元素下属性的名称，根据属性名称获取属性值
@H_404_4@//String value = attributes.getValue("id");
@H_404_4@//System.out.println("book的属性值是:" + value);
@H_404_4@System.out.println("=====================开始遍历第" + bookIndex + "本书的内容=============================");
@H_404_4@//在不知道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
@H_404_4@int num = attributes.getLength();
@H_404_4@for(int i = 0; i < num; i++){
@H_404_4@
@H_404_4@System.out.print("book元素的第: " + (i + 1) + "个属性名是: " + attributes.getQName(i));
@H_404_4@System.out.println("----属性值是 : " + attributes.getValue(i));
@H_404_4@if(attributes.getQName(i).equals("id")){
@H_404_4@book.setId(attributes.getValue(i));
@H_404_4@
@H_404_4@}
@H_404_4@}
@H_404_4@}
@H_404_4@else if(!qName.equals("book") && !qName.equals("bookstore")){
@H_404_4@System.out.print("节点名是 : " + qName);
@H_404_4@
@H_404_4@}
@H_404_4@}
@H_404_4@
@H_404_4@/*
@H_404_4@* 用来标识解析的开始
@H_404_4@* */
@H_404_4@@Override
@H_404_4@public void startDocument() throws SAXException {
@H_404_4@// TODO Auto-generated method stub
@H_404_4@System.out.println("SAX解析开始！！");
@H_404_4@super.startDocument();
@H_404_4@}
@H_404_4@
@H_404_4@/*
@H_404_4@* 用来标识解析的结束
@H_404_4@* */
@H_404_4@@Override
@H_404_4@public void endDocument() throws SAXException {
@H_404_4@// TODO Auto-generated method stub
@H_404_4@System.out.println("SAX解析结束！！");
@H_404_4@super.endDocument();
@H_404_4@}
@H_404_4@/*
@H_404_4@* 用来遍历XML文件的结束标签
@H_404_4@* */
@H_404_4@@Override
@H_404_4@public void endElement(String uri,String qName)
@H_404_4@throws SAXException {
@H_404_4@// TODO Auto-generated method stub
@H_404_4@super.endElement(uri,qName);
@H_404_4@if(qName.equals("book")){
@H_404_4@bookList.add(book);
@H_404_4@book = null;
@H_404_4@System.out.println("=====================结束遍历第" + bookIndex +"本书的内容=============================");
@H_404_4@}
@H_404_4@else if(qName.equals("name")){
@H_404_4@book.setName(value);
@H_404_4@}
@H_404_4@else if(qName.equals("author")){
@H_404_4@book.setAuthor(value);
@H_404_4@}
@H_404_4@else if(qName.equals("year")){
@H_404_4@book.setYear(value);
@H_404_4@}else if(qName.equals("price")){
@H_404_4@book.setPrice(value);
@H_404_4@}else if(qName.equals("language")){
@H_404_4@book.setLanguage(value);
@H_404_4@}
@H_404_4@}
@H_404_4@
@H_404_4@@Override
@H_404_4@public void characters(char[] ch,int start,int length)
@H_404_4@throws SAXException {
@H_404_4@// TODO Auto-generated method stub
@H_404_4@super.characters(ch,start,length);
@H_404_4@
@H_404_4@value = new String(ch,length);
@H_404_4@if(!value.trim().equals("")){
@H_404_4@System.out.println("--节点值是: " + value);
@H_404_4@}
@H_404_4@
@H_404_4@
@H_404_4@}
}@H_404_4@

@H_404_4@

3、@H_404_4@

@H_404_4@

package com.jj; public class Book { private String id; private String name; private String author; private String year; private String price; private String language; public String getId() { return id; } public void setId(String id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getAuthor() { return author; } public void setAuthor(String author) { this.author = author; } public String getYear() { return year; } public void setYear(String year) { this.year = year; } public String getPrice() { return price; } public void setPrice(String price) { this.price = price; } public String getLanguage() { return language; } public void setLanguage(String language) { this.language = language; } }@H_404_4@

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