java反序列化xml，为什么报错了？

wangcb80 2015-04-14 06:14:47

下面是在D盘下，People.xml文件：



<?xml version="1.0" encoding="ISO-8859-1"?>

<people>

    <person>

        <first>Dr. Bunsen</first>

        <last>Honeydew</last>

    </person>

    <person>

        <first>Gonzo</first>

        <last>The Great</last>

    </person>

    <person>

        <first>Phillip J.</first>

        <last>Fry</last>

    </person>

</people>

下面是java文件：



import java.util.ArrayList;

import nu.xom.Builder;

import nu.xom.Document;

import nu.xom.Elements;



public class People extends ArrayList<Person>{

    public People(String fileName) throws Exception{

        Document doc = new Builder().build(fileName);

        Elements elements = doc.getRootElement().getChildElements();

        for(int i = 0;i<elements.size();i++)

            add(new Person(elements.get(i)));

    }

    public static void main(String[] args) throws Exception{

        People p = new People("d:\\People.xml");

        System.out.println(p);

    }  

}

运行环境是netbeans 8.0.2，错误如下所示：



Exception in thread "main" com.sun.org.apache.xerces.internal.util.URI$MalformedURIException: Opaque part contains invalid character: \

	at com.sun.org.apache.xerces.internal.util.URI.initializePath(URI.java:1142)

	at com.sun.org.apache.xerces.internal.util.URI.initialize(URI.java:702)

	at com.sun.org.apache.xerces.internal.util.URI.<init>(URI.java:314)

	at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.expandSystemId(XMLEntityManager.java:2037)

	at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(XMLEntityManager.java:612)

	at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startEntity(XMLEntityManager.java:1300)

	at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startDocumentEntity(XMLEntityManager.java:1252)

	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.setInputSource(XMLDocumentScannerImpl.java:257)

	at com.sun.org.apache.xerces.internal.parsers.DTDConfiguration.parse(DTDConfiguration.java:508)

	at com.sun.org.apache.xerces.internal.parsers.DTDConfiguration.parse(DTDConfiguration.java:590)

	at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)

	at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)

	at nu.xom.Builder.build(Unknown Source)

	at nu.xom.Builder.build(Unknown Source)

	at xml.People.<init>(People.java:21)

	at xml.People.main(People.java:27)

Java Result: 1

这是java编程思想第4版，587页的例子。

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wangcb80 2015-04-14

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我已知道答案是：是书上的Java原文件印错了。正确的如下:

public class People extends ArrayList<Person>{
    public People(File fileName) throws Exception{
        Document doc = new Builder().build(fileName);
        Elements elements = doc.getRootElement().getChildElements();
        for(int i = 0;i<elements.size();i++)
            add(new Person(elements.get(i)));
    }
    public static void main(String[] args) throws Exception{
        File file = new File("D:\\People.xml");
        People p = new People(file);
        System.out.println(p);
    }  
}