java读XML的问题,不是很难,进来留言都有分,分不够再加

[bbbxx]

import java.io.*;
import javax.xml.parsers.*;
import org.w3c.dom.*;

public class useDomPrintElements {
public static NodeList nodelist;
public static void main(String[] args) {
try {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document document = builder.parse(new File("publication.xml"));
Element element = document.getDocumentElement();
nodelist = element.getChildNodes();
System.out.println(nodelist.getLength());
for(int i=0;i<nodelist.getLength();i++) {
Node m=nodelist.item(i);
System.out.println(m.getNodeName());
}
}
catch(Exception e){}
}
------------------------------------------------------------------publication.xml
<?xml version="1.0" encoding="UTF-8"?>
<publication>
<book>
<Title>The Mythical Man-month</Title>
<Writer>Frederick P. Brooks Jr.</Writer>
<PublishDate>1975-03-12</PublishDate>
</book>
<book>
<Title>Think In Java</Title>
<Writer>Bruce Eckel</Writer>
<PublishDate>1999-04-01</PublishDate>
</book>
</publication>
--------------------------------------------------------------问题1
for循环打出的为什么是
#text
book
#text
book
#text

--------------------------------------------------------------问题2
根接点下明明只有2个<book></book>为什么会循环5次呢?#text是什么东西呀?

[rootcn]

文档中说,元素之间的空格也算是一个text 元素.
如果你将XML改为以下,就只有两个了.
-----------------
publication.xml
<?xml version="1.0" encoding="UTF-8"?>
<publication><book>
<Title>The Mythical Man-month</Title>
<Writer>Frederick P. Brooks Jr.</Writer>
<PublishDate>1975-03-12</PublishDate>
</book><book>
<Title>Think In Java</Title>
<Writer>Bruce Eckel</Writer>
<PublishDate>1999-04-01</PublishDate>
</book></publication>

[rootcn]

#text 是文本类型, 用 getNodeName() 取得,如果用getNodeValue()就能取到它的值了.

[shihp]

你看一下JDK的文档，就知道了

[shangwei80]

for(int i=0;i<nodelist.getLength();i++)
{
Element node=(Element)nl.item(i);
System.out.println("Title:"+node.getElementsByTagName("Title").item(0).getFirstChild().getNodeValue());
System.out.println("Writer:"+node.getElementsByTagName("Writer").item(0).getFirstChild().getNodeValue());
System.out.println("PublishDate:"+node.getElementsByTagName("PublishDate").item(0).getFirstChild().getNodeValue());
}

[shangwei80]

Element node=(Element)nl.item(i);改为:
Element node=(Element)nodelist.item(i);