有关于读取XML文档内容的java代码的书写

来源：互联网发布：人工智能的运用领域编辑：程序博客网时间：2024/06/10 07:51

最近通过学习,想分享给大家一些关于读取XML文档的内容的简单代码,很是好用.废话不多说,那就开始了:

这是读取信息的核心代码:

package com.iflytek.data;

import java.util.ArrayList;
import java.util.List;

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

import com.iflytek.entity.Book;

public class BookHandler extends DefaultHandler {

   private List<Book> books = null;
   private Book book = null;
   private String currentTag = null;

   public List<Book> getBooks() {
       return books;
   }

   @Override
   public void startDocument() throws SAXException {

       books = new ArrayList<Book>();
   }

   @Override
   public void endDocument() throws SAXException {

   }

   @Override
   public void startElement(String uri, String localName, String qName,
           Attributes attributes) throws SAXException {

       if (qName.equals("book")) {
           book = new Book();
           // 直接获取id的值
           String id = attributes.getValue(0);
           book.setUuid(id);

       }
       currentTag = qName;
       for (int i = 0; i < attributes.getLength(); i++) {
           // 属性名
           String attName = attributes.getQName(i);
           // 属性值
           String attValue = attributes.getValue(i);

       }

   }

   @Override
   public void endElement(String uri, String localName, String qName)
           throws SAXException {

       if (qName.equals("book")) {
           books.add(book);
           book = null;

       }
       currentTag = null;
   }

   // 文本几点包括空白
   @Override
   public void characters(char[] ch, int start, int length)
           throws SAXException {
       String value = new String(ch, start, length);

       if (currentTag != null) {
           if (currentTag.equals("name")) {
               book.setBookname(value);
           } else if (currentTag.equals("publish")) {
               book.setBookpublish(value);
           }else if (currentTag.equals("author")) {
               book.setAuthor(value);
           }else if (currentTag.equals("state")) {
               book.setImp(value);
           }
       }
   }

}
这些代码是对Book对象进行操作的,你需要新建一个Book对象属性可以自己定义,然后在核心代码里面对对应的String进行修改.

还有是main函数的操作和调用:

package com.iflytek.xmltest;

import java.io.File;
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.helpers.DefaultHandler;

public class XmlSAXTest {

   public static void main(String[] args) {
       // TODO Auto-generated method stub
       readbySax(new File("e:\\book.xml"));
   }


   public static void readbySax(File file)
   {
       SAXParserFactory saxFacoty=SAXParserFactory.newInstance();
       try {
           SAXParser parser=saxFacoty.newSAXParser();
           BookHandler bHandler=new BookHandler();
           parser.parse(file,bHandler);

           System.out.println("****************************************");
           for(Book book:bHandler.getBooks())
           {
               System.out.println(book);
           }

       } 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();
       }

   }

}

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