导入老师的课件，一个字没改，运行时出现各种异常，看不懂啊，求大神。
这是老师的代码，是xml的DOM用法
package com.imooc.domtest.test;
import java.io.IOException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
public class DOMTest {
public static void main(String[] args) {
//创建一个DocumentBuilderFactory的对象
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
//创建一个DocumentBuilder的对象
try {
//创建DocumentBuilder对象
DocumentBuilder db = dbf.newDocumentBuilder();
//通过DocumentBuilder对象的parser方法加载books.xml文件到当前项目下
Document document = db.parse("books.xml");
//获取所有book节点的集合
NodeList bookList = document.getElementsByTagName("book");
//通过nodelist的getLength()方法可以获取bookList的长度
System.out.println("一共有" + bookList.getLength() + "本书");
//遍历每一个book节点
for (int i = 0; i < bookList.getLength(); i++) {
System.out.println("=================下面开始遍历第" + (i + 1) + "本书的内容=================");
//通过 item(i)方法 获取一个book节点，nodelist的索引值从0开始
Node book = bookList.item(i);
// 获取book节点的所有属性集合
NamedNodeMap attrs = book.getAttributes();
System.out.println("第 " + (i + 1) + "本书共有" + attrs.getLength() + "个属性");
// 遍历book的属性
for (int j = 0; j < attrs.getLength(); j++) {
//通过item(index)方法获取book节点的某一个属性
Node attr = attrs.item(j);
//获取属性名
System.out.print("属性名：" + attr.getNodeName());
//获取属性值
System.out.println("--属性值" + attr.getNodeValue());
}
// //前提：已经知道book节点有且只能有1个id属性
// //将book节点进行强制类型转换，转换成Element类型
// Element book = (Element) bookList.item(i);
// //通过getAttribute("id")方法获取属性值
// String attrValue = book.getAttribute("id");
// System.out.println("id属性的属性值为" + attrValue);
//解析book节点的子节点
NodeList childNodes = book.getChildNodes();
//遍历childNodes获取每个节点的节点名和节点值
System.out.println("第" + (i+1) + "本书共有" +
childNodes.getLength() + "个子节点");
for (int k = 0; k < childNodes.getLength(); k++) {
//区分出text类型的node以及element类型的node
if (childNodes.item(k).getNodeType() == Node.ELEMENT_NODE) {
//获取了element类型节点的节点名
System.out.print("第" + (k + 1) + "个节点的节点名："
+ childNodes.item(k).getNodeName());
// 获取了element类型节点的节点值
System.out.println("--节点值是：" + childNodes.item(k).getFirstChild().getNodeValue());
// System.out.println("--节点值是：" + childNodes.item(k).getTextContent());
}
}
System.out.println("======================结束遍历第" + (i + 1) + "本书的内容=================");
}
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (SAXException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
解析的文件内容是<?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>报错信息：
com.sun.org.apache.xerces.internal.impl.io.MalformedByteSequenceException: 1 字节的 UTF-8 序列的字节 1 无效。
at com.sun.org.apache.xerces.internal.impl.io.UTF8Reader.invalidByte(UTF8Reader.java:701)
at com.sun.org.apache.xerces.internal.impl.io.UTF8Reader.read(UTF8Reader.java:567)
at com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.load(XMLEntityScanner.java:1793)
at com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.peekChar(XMLEntityScanner.java:503)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2719)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:606)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:848)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:243)
at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:339)
at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:177)
at com.imooc.domtest.test.DOMTest.main(DOMTest.java:26)
